Integrate Keepass2android functionality with standalone

app/src/main/java/net/helcel/fidelity/activity/MainActivity.kt

@@ -1,11 +1,19 @@
 package net.helcel.fidelity.activity
 
 import android.annotation.SuppressLint
+import android.content.Intent
 import android.content.pm.ActivityInfo
 import android.os.Bundle
 import androidx.activity.compose.BackHandler
 import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.systemBarsPadding
+import androidx.compose.material.MaterialTheme
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalContext
 import androidx.fragment.app.FragmentActivity
 import androidx.navigation.compose.NavHost
@@ -15,20 +23,32 @@ import net.helcel.fidelity.activity.fragment.CreateEntryScreen
 import net.helcel.fidelity.activity.fragment.FileScanner
 import net.helcel.fidelity.activity.fragment.InitialScreen
 import net.helcel.fidelity.activity.fragment.LauncherScreen
+import net.helcel.fidelity.activity.fragment.ModeSelectScreen
 import net.helcel.fidelity.activity.fragment.ScannerScreen
 import net.helcel.fidelity.activity.fragment.ViewEntryScreen
-import net.helcel.fidelity.tools.FidelityRepository.entries
+import net.helcel.fidelity.tools.AppMode
+import net.helcel.fidelity.tools.AppModeStore
+import net.helcel.fidelity.tools.FidelityEntry
+import net.helcel.fidelity.tools.FidelityRepository.cacheEntry
+import net.helcel.fidelity.tools.FidelityRepository.findEntry
 import net.helcel.fidelity.tools.FidelityRepository.loadEntries
+import net.helcel.fidelity.tools.FidelityRepository.transientEntry
 import net.helcel.fidelity.tools.KeePassStore.hasCredentials
+import net.helcel.fidelity.tools.Kp2a
 
 class MainActivity : FragmentActivity() {
 
+    // Entry pushed by Keepass2Android when the user opens this app from an entry.
+    private val incomingEntry = mutableStateOf<FidelityEntry?>(null)
+
     @SuppressLint("SourceLockedOrientationActivity")
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         actionBar?.hide()
         requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
+        AppModeStore.load(this)
         loadEntries(this.baseContext)
+        incomingEntry.value = Kp2a.entryFromIntent(intent)
 
         setContent {
             SysTheme {
@@ -39,24 +59,49 @@ class MainActivity : FragmentActivity() {
                     if (!navController.popBackStack()) finish()
                 }
                 LaunchedEffect(Unit) {
-                    if(!hasCredentials(context)) navController.navigate("init")
+                    when (AppModeStore.mode.value) {
+                        null -> navController.navigate("mode")
+                        AppMode.STANDALONE ->
+                            if (!hasCredentials(context)) navController.navigate("init")
+                        AppMode.KP2A -> {}
+                    }
                 }
-                NavHost(navController = navController, startDestination = "launcher") {
-                    composable("exit") { finish() }
-                    composable("launcher") { LauncherScreen(navController) }
-                    composable("init"){ InitialScreen (navController)}
-                    composable("scanCam") { ScannerScreen(navController) }
-                    composable("scanFile") { FileScanner(navController) }
-                    composable("edit"){ CreateEntryScreen(navController) }
-                    composable("view/{entryId}") { e ->
-                        val entry = entries.find {
-                            it.uid == (e.arguments?.getString("entryId") ?: "")
+                LaunchedEffect(incomingEntry.value) {
+                    val entry = incomingEntry.value ?: return@LaunchedEffect
+                    incomingEntry.value = null
+                    if (AppModeStore.isKp2a) cacheEntry(context, entry)
+                    else transientEntry.value = entry
+                    navController.navigate("view/${entry.uid}")
+                }
+                // The app draws edge-to-edge (targetSdk >= 35): keep every screen clear of the
+                // status and navigation bars, and paint the bars with the theme background.
+                Box(
+                    modifier = Modifier
+                        .fillMaxSize()
+                        .background(MaterialTheme.colors.background)
+                        .systemBarsPadding()
+                ) {
+                    NavHost(navController = navController, startDestination = "launcher") {
+                        composable("exit") { finish() }
+                        composable("mode") { ModeSelectScreen(navController) }
+                        composable("launcher") { LauncherScreen(navController) }
+                        composable("init") { InitialScreen(navController) }
+                        composable("scanCam") { ScannerScreen(navController) }
+                        composable("scanFile") { FileScanner(navController) }
+                        composable("edit") { CreateEntryScreen(navController) }
+                        composable("view/{entryId}") { e ->
+                            val entry = findEntry(e.arguments?.getString("entryId"))
+                            if (entry == null) return@composable navController.navigate("launcher")
+                            ViewEntryScreen(navController, entry)
                         }
-                        if (entry == null) return@composable navController.navigate("launcher")
-                        ViewEntryScreen(navController,entry)
                     }
                 }
             }
         }
     }
+
+    override fun onNewIntent(intent: Intent) {
+        super.onNewIntent(intent)
+        Kp2a.entryFromIntent(intent)?.let { incomingEntry.value = it }
+    }
 }

app/src/main/java/net/helcel/fidelity/activity/fragment/CreateEntry.kt

@@ -1,5 +1,6 @@
 package net.helcel.fidelity.activity.fragment
 
+import android.content.Context
 import android.graphics.Bitmap
 import androidx.compose.foundation.Image
 import androidx.compose.foundation.background
@@ -13,8 +14,11 @@ import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.rememberScrollState
+import androidx.compose.foundation.verticalScroll
 import androidx.compose.material.Button
 import androidx.compose.material.Checkbox
 import androidx.compose.material.CheckboxDefaults
@@ -31,6 +35,7 @@ import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.ArrowDropDown
 import androidx.compose.material.icons.filled.Camera
 import androidx.compose.material.icons.filled.FileOpen
+import androidx.compose.material.icons.filled.FolderOpen
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.getValue
@@ -47,21 +52,27 @@ import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavHostController
 import com.google.zxing.FormatException
-import com.kunzisoft.keepass.database.element.Entry
+import com.kunzisoft.keepass.database.element.Group
 import kotlinx.coroutines.delay
 import kotlinx.coroutines.launch
 import net.helcel.fidelity.R
 import net.helcel.fidelity.activity.ToastHelper
+import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.ensureUnlocked
 import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.onCameraScan
 import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.onFileScan
+import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.onSaveKp2a
+import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.onSaveStandalone
 import net.helcel.fidelity.activity.fragment.CreateEntryEventHandler.onSubmit
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onRefresh
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onSave
+import net.helcel.fidelity.tools.AppModeStore
 import net.helcel.fidelity.tools.BarcodeGenerator.generateBarcode
 import net.helcel.fidelity.tools.FidelityEntry
-import net.helcel.fidelity.tools.FidelityRepository
 import net.helcel.fidelity.tools.FidelityRepository.activeEntry
-import net.helcel.fidelity.tools.FidelityRepository.addEntry
+import net.helcel.fidelity.tools.KeepassDatabase
+import net.helcel.fidelity.tools.KeepassDatabase.addEntry
+import net.helcel.fidelity.tools.FidelityRepository.cacheEntry
+import net.helcel.fidelity.tools.Kp2a
 import kotlin.time.Duration.Companion.milliseconds
 
 
@@ -79,6 +90,22 @@ fun CreateEntryScreen(navController: NavHostController?) {
     var isLoading by remember { mutableStateOf(false) }
     val ctx = LocalContext.current
     val scope = rememberCoroutineScope()
+    val kp2a = AppModeStore.isKp2a
+    // Standalone only: where a new card is created (root unless changed). Existing cards
+    // (uid set) stay where they are.
+    var group by remember { mutableStateOf(KeepassDatabase.getRoot()) }
+    val showGroup = !kp2a && entry.uid == null
+
+    fun pickGroup() {
+        isLoading = true
+        scope.launch {
+            if (ensureUnlocked(ctx, navController!!)) {
+                group = group ?: KeepassDatabase.getRoot()
+                showDialog = true
+            }
+            isLoading = false
+        }
+    }
 
     LaunchedEffect(entry) {
         isValidBarcode = false
@@ -103,17 +130,10 @@ fun CreateEntryScreen(navController: NavHostController?) {
     }
 
     if (showDialog) {
-        TreeSelectorDialog(
-            onDismiss = {
-                showDialog = false
-                if(it!=null){
-                    entry = entry.copy(uid = it.nodeId?.id.toString())
-                    if(it is Entry){
-                        entry = entry.copy(title = it.title)
-                    }
-                }
-            }
-        )
+        TreeSelectorDialog(groupsOnly = true) {
+            showDialog = false
+            if (it is Group) group = it
+        }
     }
     val formats = stringArrayResource(R.array.format_array)
 
@@ -121,16 +141,18 @@ fun CreateEntryScreen(navController: NavHostController?) {
         modifier = Modifier
             .fillMaxSize()
             .background(MaterialTheme.colors.background)
+            .imePadding(),
     ) {
         Column(
             modifier = Modifier
-                .padding(16.dp, 32.dp),
+                .verticalScroll(rememberScrollState())
+                .padding(16.dp, 32.dp)
+                .padding(bottom = 120.dp),
             verticalArrangement = Arrangement.spacedBy(12.dp)
         )
         {
             OutlinedTextField(
                 value = entry.title,
-                enabled = entry.uid!=null,
                 onValueChange = {
                     entry = entry.copy(title = it)
                     errorTitle = ""
@@ -140,8 +162,7 @@ fun CreateEntryScreen(navController: NavHostController?) {
                 modifier = Modifier.fillMaxWidth(),
                 singleLine = true,
                 colors = TextFieldDefaults.textFieldColors(
-                    textColor = if(entry.uid!=null)MaterialTheme.colors.onBackground
-                    else MaterialTheme.colors.secondary
+                    textColor = MaterialTheme.colors.onBackground
                 ),
             )
             if (errorTitle.isNotEmpty()) {
@@ -201,6 +222,23 @@ fun CreateEntryScreen(navController: NavHostController?) {
                     Icon(Icons.Default.FileOpen, contentDescription = null)
                 }
             }
+            if (showGroup) {
+                Row(
+                    verticalAlignment = Alignment.CenterVertically,
+                    modifier = Modifier.fillMaxWidth()
+                ) {
+                    Text("Group: ", color = MaterialTheme.colors.onBackground)
+                    Text(
+                        group?.title ?: "(database root)",
+                        color = MaterialTheme.colors.onBackground,
+                        modifier = Modifier.weight(1f),
+                        maxLines = 1,
+                    )
+                    Button(onClick = { pickGroup() }) {
+                        Icon(Icons.Default.FolderOpen, contentDescription = "Choose group")
+                    }
+                }
+            }
             if (barcodeBitmap != null) {
                 Image(
                     bitmap = barcodeBitmap!!.asImageBitmap(),
@@ -229,41 +267,22 @@ fun CreateEntryScreen(navController: NavHostController?) {
                             errorCode = c
                             errorFormat = f
                         },
-                        isValidBarcode
+                        isValidBarcode,
                     ) {
-                        if (FidelityRepository.getRoot() == null) {
+                        if (kp2a) {
+                            onSaveKp2a(ctx, navController!!, entry)
+                        } else {
                             isLoading = true
                             scope.launch {
-                                onRefresh(ctx, navController!!)
+                                onSaveStandalone(ctx, navController!!, entry, group)
                                 isLoading = false
-                                if(entry.uid!=null){
-                                    addEntry(ctx,entry)
-                                    isLoading = true
-                                    onSave(ctx,navController)
-                                    isLoading = false
-                                    onSubmit(navController)
-                                }else {
-                                    showDialog = true
-                                }
-                            }
-                        } else {
-                            if(entry.uid!=null){
-                                addEntry(ctx,entry)
-                                isLoading = true
-                                scope.launch {
-                                    onSave(ctx, navController!!)
-                                    isLoading = false
-                                    onSubmit(navController)
-                                }
-                            }else {
-                                showDialog = true
                             }
                         }
                     }
                 },
-                enabled = isValidBarcode.and(entry.uid==null || entry.title.isNotEmpty()),
+                enabled = isValidBarcode && entry.title.isNotEmpty(),
             ) {
-                Text(if(entry.uid==null)"Select Entry" else "Save", style = MaterialTheme.typography.h6)
+                Text("Save", style = MaterialTheme.typography.h6)
             }
         }
 
@@ -346,7 +365,7 @@ private fun onSubmitIfValid(
     var tErr = ""
     var cErr = ""
     var fErr = ""
-    if (entry.uid!=null && entry.title.isBlank()) tErr = "Title cannot be empty"
+    if (entry.title.isBlank()) tErr = "Title cannot be empty"
     if (entry.code.isBlank()) cErr = "Code cannot be empty"
     if (entry.format.isBlank()) fErr = "Format cannot be empty"
 
@@ -358,6 +377,38 @@ private fun onSubmitIfValid(
 }
 
 object CreateEntryEventHandler {
+    /** Standalone: the database must be open before groups can be browsed or cards written. */
+    suspend fun ensureUnlocked(context: Context, navController: NavHostController): Boolean =
+        KeepassDatabase.getRoot() != null || onRefresh(context, navController)
+
+    /** Standalone: updates the existing entry, or creates one in [group] (the root when null). */
+    suspend fun onSaveStandalone(
+        context: Context,
+        navController: NavHostController,
+        entry: FidelityEntry,
+        group: Group?,
+    ) {
+        if (!ensureUnlocked(context, navController)) return
+        val root = KeepassDatabase.getRoot() ?: return
+        val target =
+            if (entry.uid != null) entry
+            else entry.copy(uid = (group ?: root).nodeId.id.toString())
+        addEntry(context, target)
+        if (onSave(context, navController)) onSubmit(navController)
+    }
+
+    /**
+     * KP2A creates the entry in its own task and never reports back, so the card is cached
+     * right away; a later fetch replaces the local uid with KP2A's.
+     */
+    fun onSaveKp2a(context: Context, navController: NavHostController, entry: FidelityEntry) {
+        val kpEntry = entry.copy(uid = Kp2a.localUid(entry.title))
+        if (Kp2a.launchAdd(context, kpEntry)) {
+            cacheEntry(context, kpEntry)
+            onSubmit(navController)
+        }
+    }
+
     fun onSubmit(navController: NavHostController){
         navController.popBackStack()
         activeEntry.value = activeEntry.value.copy(

app/src/main/java/net/helcel/fidelity/activity/fragment/FidelityRow.kt

@@ -0,0 +1,152 @@
+package net.helcel.fidelity.activity.fragment
+
+import androidx.compose.foundation.combinedClickable
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.DropdownMenu
+import androidx.compose.material.DropdownMenuItem
+import androidx.compose.material.ExperimentalMaterialApi
+import androidx.compose.material.Icon
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Delete
+import androidx.compose.material.icons.filled.Edit
+import androidx.compose.material.icons.filled.HideSource
+import androidx.compose.material.icons.filled.PushPin
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import androidx.navigation.NavHostController
+import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onEdit
+import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onHide
+import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onPin
+import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onRemove
+import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onView
+import net.helcel.fidelity.tools.AppModeStore
+import net.helcel.fidelity.tools.FidelityEntry
+
+/** One card in the launcher grid: tap to view, long-press for the actions menu. */
+@OptIn(ExperimentalMaterialApi::class)
+@Composable
+fun FidelityRow(
+    navController: NavHostController,
+    e: FidelityEntry
+) {
+    var expanded by remember { mutableStateOf(false) }
+    val context = LocalContext.current
+
+    Box(modifier = Modifier.fillMaxWidth()) {
+        Card(
+            modifier = Modifier
+                .fillMaxWidth()
+                .padding(2.dp)
+                .combinedClickable(
+                    onClick = { onView(navController, e) },
+                    onLongClick = { expanded = true },
+                ),
+            shape = RoundedCornerShape(8.dp),
+            colors = CardDefaults.cardColors(
+                containerColor = MaterialTheme.colors.primary,
+                contentColor = MaterialTheme.colors.background
+            ),
+        ) {
+            Box(modifier = Modifier.fillMaxSize().padding(2.dp)) {
+                Row(modifier = Modifier.padding(14.dp)) {
+                    Text(
+                        text = e.title,
+                        style = MaterialTheme.typography.h6,
+                        color = MaterialTheme.colors.onPrimary
+                    )
+                }
+                Row(modifier = Modifier.align(Alignment.TopEnd)) {
+                    if (e.hidden)
+                        Icon(
+                            Icons.Default.HideSource, contentDescription = null,
+                            modifier = Modifier.size(16.dp),
+                            tint = MaterialTheme.colors.onPrimary
+                        )
+                    if (e.hidden && e.pinned)
+                        Spacer(modifier = Modifier.width(8.dp))
+                    if (e.pinned)
+                        Icon(
+                            Icons.Default.PushPin, contentDescription = null,
+                            modifier = Modifier.size(16.dp),
+                            tint = MaterialTheme.colors.onPrimary
+                        )
+
+                }
+            }
+        }
+        DropdownMenu(
+            modifier = Modifier,
+            expanded = expanded,
+            onDismissRequest = { expanded = false }
+        ) {
+            // KP2A entries can only be edited in KP2A itself; offer to drop the cached copy.
+            if (AppModeStore.isKp2a)
+                DropdownMenuItem(onClick = {
+                    expanded = false
+                    onRemove(context, e)
+                }) {
+                    Icon(
+                        Icons.Default.Delete,
+                        contentDescription = "remove",
+                    )
+                    Spacer(modifier= Modifier.width(8.dp))
+                    Text("Remove")
+                }
+            else
+                DropdownMenuItem(onClick = {
+                    expanded = false
+                    onEdit(navController, e)
+                }) {
+                    Icon(
+                        Icons.Default.Edit,
+                        contentDescription = "edit",
+                    )
+                    Spacer(modifier= Modifier.width(8.dp))
+                    Text("Edit")
+                }
+            DropdownMenuItem(onClick = {
+                expanded = false
+                onPin(e)
+            }) {
+                Icon(
+                    Icons.Default.PushPin,
+                    contentDescription = "pin",
+                )
+                Spacer(modifier= Modifier.width(8.dp))
+                if(e.pinned) Text("Unpin")
+                else Text("Pin")
+            }
+            DropdownMenuItem(onClick = {
+                expanded = false
+                onHide(e)
+            }) {
+                Icon(
+                    Icons.Default.HideSource,
+                    contentDescription = "hide",
+                )
+                Spacer(modifier= Modifier.width(8.dp))
+                if(e.hidden) Text("Unhide")
+                else Text("Hide")
+            }
+        }
+    }
+}

app/src/main/java/net/helcel/fidelity/activity/fragment/Launcher.kt

@@ -1,10 +1,12 @@
 package net.helcel.fidelity.activity.fragment
 
+import android.app.Activity
 import android.content.Context
 import androidx.activity.compose.BackHandler
+import androidx.activity.compose.rememberLauncherForActivityResult
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
-import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.interaction.MutableInteractionSource
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -19,25 +21,20 @@ import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.grid.GridCells
 import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
 import androidx.compose.foundation.lazy.grid.items
-import androidx.compose.foundation.shape.RoundedCornerShape
-import androidx.compose.material.DropdownMenu
-import androidx.compose.material.DropdownMenuItem
-import androidx.compose.material.ExperimentalMaterialApi
 import androidx.compose.material.FloatingActionButton
 import androidx.compose.material.Icon
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.OutlinedTextField
 import androidx.compose.material.Text
+import androidx.compose.material.TextButton
 import androidx.compose.material.TextFieldDefaults
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Add
 import androidx.compose.material.icons.filled.Close
-import androidx.compose.material.icons.filled.Edit
 import androidx.compose.material.icons.filled.HideSource
-import androidx.compose.material.icons.filled.PushPin
+import androidx.compose.material.icons.filled.Key
 import androidx.compose.material.icons.filled.Search
-import androidx.compose.material3.Card
-import androidx.compose.material3.CardDefaults
+import androidx.compose.material.icons.filled.SwapHoriz
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.pulltorefresh.PullToRefreshBox
 import androidx.compose.runtime.Composable
@@ -56,28 +53,23 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavHostController
-import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.launch
-import kotlinx.coroutines.withContext
 import net.helcel.fidelity.activity.ToastHelper
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.isSearchVisible
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onAdd
-import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onEdit
-import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onHide
-import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onPin
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onQuery
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onRefresh
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.onView
 import net.helcel.fidelity.activity.fragment.LauncherEventHandlers.searchQuery
-import net.helcel.fidelity.tools.CredentialResult
+import net.helcel.fidelity.tools.AppModeStore
 import net.helcel.fidelity.tools.FidelityEntry
 import net.helcel.fidelity.tools.FidelityRepository.activeEntry
-import net.helcel.fidelity.tools.FidelityRepository.end
+import net.helcel.fidelity.tools.FidelityRepository.cacheEntry
 import net.helcel.fidelity.tools.FidelityRepository.entries
-import net.helcel.fidelity.tools.FidelityRepository.genCredentials
-import net.helcel.fidelity.tools.FidelityRepository.importDB
-import net.helcel.fidelity.tools.FidelityRepository.start
-import net.helcel.fidelity.tools.KeePassStore.loadCredentials
+import net.helcel.fidelity.tools.KeepassDatabase
+import net.helcel.fidelity.tools.FidelityRepository.loadEntries
+import net.helcel.fidelity.tools.FidelityRepository.removeEntry
+import net.helcel.fidelity.tools.Kp2a
 
 @Preview
 @OptIn(ExperimentalMaterial3Api::class)
@@ -91,6 +83,20 @@ fun LauncherScreen(
     val context = LocalContext.current
     val scope = rememberCoroutineScope()
     val focusRequester = remember { FocusRequester() }
+    val kp2a = AppModeStore.isKp2a
+
+    val kp2aQueryLauncher = rememberLauncherForActivityResult(
+        contract = ActivityResultContracts.StartActivityForResult()
+    ) { result ->
+        if (result.resultCode != Activity.RESULT_OK) return@rememberLauncherForActivityResult
+        val entry = Kp2a.entryFromIntent(result.data)
+        if (entry == null) {
+            ToastHelper.show(context, "Entry has no fidelity code")
+            return@rememberLauncherForActivityResult
+        }
+        cacheEntry(context, entry)
+        onView(navController, entry)
+    }
 
     BackHandler(enabled = isSearchVisible) {
         onQuery()
@@ -118,7 +124,9 @@ fun LauncherScreen(
             onRefresh = {
                 isRefreshingState = true
                 scope.launch {
-                    onRefresh(context, navController)
+                    // KP2A owns the database: nothing to sync, just reload the cache.
+                    if (kp2a) loadEntries(context)
+                    else onRefresh(context, navController)
                     isRefreshingState = false
                 }
             },
@@ -126,6 +134,45 @@ fun LauncherScreen(
             modifier = Modifier.fillMaxSize()
         ) {
             Column(modifier = Modifier.fillMaxSize()) {
+                // Top bar: hidden-cards toggle on the left, storage mode on the right.
+                Row(
+                    modifier = Modifier
+                        .fillMaxWidth()
+                        .padding(horizontal = 8.dp),
+                    horizontalArrangement = Arrangement.SpaceBetween,
+                    verticalAlignment = Alignment.CenterVertically
+                ) {
+                    val hiddenTint =
+                        if (showHidden) MaterialTheme.colors.onBackground else MaterialTheme.colors.secondary
+                    TextButton(onClick = { showHidden = !showHidden }) {
+                        Icon(
+                            Icons.Default.HideSource,
+                            contentDescription = "Show Hidden",
+                            modifier = Modifier.size(16.dp),
+                            tint = hiddenTint
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            if (showHidden) "Showing hidden" else "Show hidden",
+                            style = MaterialTheme.typography.caption,
+                            color = hiddenTint
+                        )
+                    }
+                    TextButton(onClick = { navController.navigate("mode") }) {
+                        Icon(
+                            Icons.Default.SwapHoriz,
+                            contentDescription = "Switch mode",
+                            modifier = Modifier.size(16.dp),
+                            tint = MaterialTheme.colors.secondary
+                        )
+                        Spacer(modifier = Modifier.width(4.dp))
+                        Text(
+                            if (kp2a) "Keepass2Android" else "Standalone",
+                            style = MaterialTheme.typography.caption,
+                            color = MaterialTheme.colors.secondary
+                        )
+                    }
+                }
                 if (isSearchVisible) {
                     LaunchedEffect(Unit) {
                         focusRequester.requestFocus()
@@ -187,18 +234,20 @@ fun LauncherScreen(
             ) {
                 Icon(Icons.Default.Add, contentDescription = "Add")
             }
-            FloatingActionButton(
-                onClick = {
-                    showHidden=!showHidden
-                }, modifier = Modifier
-                    .align(Alignment.BottomStart)
-                    .padding(16.dp).size(24.dp),
-                backgroundColor =  if(showHidden) MaterialTheme.colors.onBackground else MaterialTheme.colors.secondary,
-            ) {
-                Icon(Icons.Default.HideSource,
-                    tint= if(showHidden) MaterialTheme.colors.background else MaterialTheme.colors.onSecondary,
-                    contentDescription = "Show Hidden")
-            }
+            if (kp2a)
+                FloatingActionButton(
+                    onClick = { Kp2a.launchQuery(context, kp2aQueryLauncher) },
+                    modifier = Modifier
+                        .align(Alignment.BottomEnd)
+                        .padding(end = 16.dp, bottom = 88.dp),
+                    backgroundColor = MaterialTheme.colors.secondary,
+                ) {
+                    Icon(
+                        Icons.Default.Key,
+                        tint = MaterialTheme.colors.onSecondary,
+                        contentDescription = "Fetch from Keepass2Android"
+                    )
+                }
         }
 
         if (isRefreshingState)
@@ -216,105 +265,9 @@ fun LauncherScreen(
 
 }
 
-@OptIn(ExperimentalMaterialApi::class)
-@Composable
-fun FidelityRow(
-    navController: NavHostController,
-    e: FidelityEntry
-) {
-    var expanded by remember { mutableStateOf(false) }
-
-    Box(modifier = Modifier.fillMaxWidth()) {
-        Card(
-            modifier = Modifier
-                .fillMaxWidth()
-                .padding(2.dp)
-                .combinedClickable(
-                    onClick = { onView(navController, e) },
-                    onLongClick = { expanded = true },
-                ),
-            shape = RoundedCornerShape(8.dp),
-            colors = CardDefaults.cardColors(
-                containerColor = MaterialTheme.colors.primary,
-                contentColor = MaterialTheme.colors.background
-            ),
-        ) {
-            Box(modifier = Modifier.fillMaxSize().padding(2.dp)) {
-                Row(modifier = Modifier.padding(14.dp)) {
-                    Text(
-                        text = e.title,
-                        style = MaterialTheme.typography.h6,
-                        color = MaterialTheme.colors.onPrimary
-                    )
-                }
-                Row(modifier = Modifier.align(Alignment.TopEnd)) {
-                    if (e.hidden)
-                        Icon(
-                            Icons.Default.HideSource, contentDescription = null,
-                            modifier = Modifier.size(16.dp),
-                            tint = MaterialTheme.colors.onPrimary
-                        )
-                    if (e.hidden && e.pinned)
-                        Spacer(modifier = Modifier.width(8.dp))
-                    if (e.pinned)
-                        Icon(
-                            Icons.Default.PushPin, contentDescription = null,
-                            modifier = Modifier.size(16.dp),
-                            tint = MaterialTheme.colors.onPrimary
-                        )
-
-                }
-            }
-        }
-        DropdownMenu(
-            modifier = Modifier,
-            expanded = expanded,
-            onDismissRequest = { expanded = false }
-        ) {
-            DropdownMenuItem(onClick = {
-                expanded = false
-                onEdit(navController, e)
-            }) {
-                Icon(
-                    Icons.Default.Edit,
-                    contentDescription = "edit",
-                )
-                Spacer(modifier= Modifier.width(8.dp))
-                Text("Edit")
-            }
-            DropdownMenuItem(onClick = {
-                expanded = false
-                onPin(e)
-            }) {
-                Icon(
-                    Icons.Default.PushPin,
-                    contentDescription = "pin",
-                )
-                Spacer(modifier= Modifier.width(8.dp))
-                if(e.pinned) Text("Unpin")
-                else Text("Pin")
-            }
-            DropdownMenuItem(onClick = {
-                expanded = false
-                onHide(e)
-            }) {
-                Icon(
-                    Icons.Default.HideSource,
-                    contentDescription = "hide",
-                )
-                Spacer(modifier= Modifier.width(8.dp))
-                if(e.hidden) Text("Unhide")
-                else Text("Hide")
-            }
-        }
-    }
-}
-
-
 object LauncherEventHandlers {
     var isSearchVisible by mutableStateOf(false)
     var searchQuery by mutableStateOf("")
-    var CRED: CredentialResult.Success? = null
 
     fun onAdd(navController: NavHostController) {
         navController.navigate("edit")
@@ -325,48 +278,22 @@ object LauncherEventHandlers {
         if (!isSearchVisible) searchQuery = ""
     }
 
-    suspend fun onSave(context: Context, navController: NavHostController){
-        try {
-            if (CRED == null) {
-                when (val res = loadCredentials(context)) {
-                    CredentialResult.AuthFailed, CredentialResult.NoData -> ToastHelper.show(context, "Unable to Load Credentials")
-                    is CredentialResult.Success -> CRED = res
-                }
-            }
-            CRED!!
-            val cred = withContext(Dispatchers.IO) {
-                genCredentials(context, CRED!!)
-            }
-            if (withContext(Dispatchers.IO) {
-                    end(context, CRED!!.db, cred)
-                })
-                throw Exception("Error in saving")
-        } catch (e: Exception) {
-            println(e.toString())
+    /** Standalone: writes the database back. Missing credentials send the user to setup. */
+    suspend fun onSave(context: Context, navController: NavHostController): Boolean {
+        if (!KeepassDatabase.ensureCredentials(context)) {
             navController.navigate("init")
+            return false
         }
+        return KeepassDatabase.save(context)
     }
 
-    suspend fun onRefresh(context: Context, navController: NavHostController) {
-        try {
-            if (CRED == null) {
-                when (val res = loadCredentials(context)) {
-                    CredentialResult.AuthFailed, CredentialResult.NoData -> ToastHelper.show(context, "Unable to Load Credentials")
-                    is CredentialResult.Success -> CRED = res
-                }
-            }
-            CRED!!
-            val cred = withContext(Dispatchers.IO) {
-                genCredentials(context, CRED!!)
-            }
-            if (withContext(Dispatchers.IO) {
-                start(context, CRED!!.db, cred)
-            })
-                importDB(context)
-        } catch (e: Exception) {
-            println(e.toString())
+    /** Standalone: (re)opens the database and imports its cards. Missing credentials send the user to setup. */
+    suspend fun onRefresh(context: Context, navController: NavHostController): Boolean {
+        if (!KeepassDatabase.ensureCredentials(context)) {
             navController.navigate("init")
+            return false
         }
+        return KeepassDatabase.unlock(context)
     }
 
     fun onView(navController: NavHostController, entry: FidelityEntry) {
@@ -389,8 +316,12 @@ object LauncherEventHandlers {
             entries[index] = entry.copy(hidden = !entry.hidden)
     }
 
+    fun onRemove(context: Context, entry: FidelityEntry) {
+        removeEntry(context, entry)
+    }
+
     fun onEdit(navController: NavHostController, entry: FidelityEntry){
         activeEntry.value = entry
         navController.navigate("edit")
     }
-}
+}

app/src/main/java/net/helcel/fidelity/activity/fragment/ModeSelect.kt

@@ -0,0 +1,154 @@
+package net.helcel.fidelity.activity.fragment
+
+import androidx.activity.compose.BackHandler
+import androidx.compose.foundation.background
+import androidx.compose.foundation.clickable
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
+import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.shape.RoundedCornerShape
+import androidx.compose.material.Icon
+import androidx.compose.material.MaterialTheme
+import androidx.compose.material.Text
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.filled.Extension
+import androidx.compose.material.icons.filled.FolderOpen
+import androidx.compose.material3.Card
+import androidx.compose.material3.CardDefaults
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.graphics.vector.ImageVector
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.unit.dp
+import androidx.navigation.NavHostController
+import kotlinx.coroutines.launch
+import net.helcel.fidelity.tools.AppMode
+import net.helcel.fidelity.tools.AppModeStore
+import net.helcel.fidelity.tools.FidelityRepository.loadEntries
+import net.helcel.fidelity.tools.KeePassStore.hasCredentials
+import net.helcel.fidelity.tools.Kp2a
+
+@Preview
+@Composable
+fun ModeSelectScreen(navController: NavHostController?) {
+    val context = LocalContext.current
+    val scope = rememberCoroutineScope()
+    val current = AppModeStore.mode.value
+    val kp2aInstalled = remember { Kp2a.isAvailable(context) }
+
+    BackHandler {
+        // Nothing to go back to before the first choice has been made.
+        if (current == null) navController!!.navigate("exit")
+        else navController!!.popBackStack()
+    }
+
+    fun select(mode: AppMode) {
+        if (mode != current) {
+            AppModeStore.set(context, mode)
+            loadEntries(context)
+        }
+        navController!!.popBackStack("launcher", inclusive = false)
+        scope.launch {
+            if (mode == AppMode.STANDALONE && !hasCredentials(context))
+                navController.navigate("init")
+        }
+    }
+
+    Box(
+        modifier = Modifier
+            .fillMaxSize()
+            .background(MaterialTheme.colors.background)
+    ) {
+        Column(
+            modifier = Modifier
+                .fillMaxSize()
+                .padding(16.dp),
+            verticalArrangement = Arrangement.Center
+        ) {
+            Text(
+                "Storage Mode",
+                style = MaterialTheme.typography.h5,
+                color = MaterialTheme.colors.onBackground
+            )
+            Spacer(modifier = Modifier.height(4.dp))
+            Text(
+                "Where should your fidelity cards be stored?",
+                style = MaterialTheme.typography.body2,
+                color = MaterialTheme.colors.onBackground
+            )
+            Spacer(modifier = Modifier.height(16.dp))
+
+            ModeCard(
+                icon = Icons.Default.FolderOpen,
+                title = "Standalone",
+                description = "Open a KeePass database (.kdbx) directly. " +
+                        "Entries are read and written by this app.",
+                selected = current == AppMode.STANDALONE,
+            ) { select(AppMode.STANDALONE) }
+            Spacer(modifier = Modifier.height(12.dp))
+            ModeCard(
+                icon = Icons.Default.Extension,
+                title = "Keepass2Android plugin",
+                description = "Use the Keepass2Android app as the database. " +
+                        "Entries are queried from and created in Keepass2Android.",
+                selected = current == AppMode.KP2A,
+            ) { select(AppMode.KP2A) }
+            if (!kp2aInstalled) {
+                Spacer(modifier = Modifier.height(8.dp))
+                Text(
+                    "Keepass2Android does not seem to be installed.",
+                    style = MaterialTheme.typography.caption,
+                    color = MaterialTheme.colors.error
+                )
+            }
+        }
+    }
+}
+
+@Composable
+private fun ModeCard(
+    icon: ImageVector,
+    title: String,
+    description: String,
+    selected: Boolean,
+    onClick: () -> Unit,
+) {
+    val container = if (selected) MaterialTheme.colors.primary else MaterialTheme.colors.surface
+    val content = if (selected) MaterialTheme.colors.onPrimary else MaterialTheme.colors.onSurface
+    Card(
+        modifier = Modifier
+            .fillMaxWidth()
+            .clickable(onClick = onClick),
+        shape = RoundedCornerShape(8.dp),
+        colors = CardDefaults.cardColors(
+            containerColor = container,
+            contentColor = content
+        ),
+        border = if (selected) null else CardDefaults.outlinedCardBorder(),
+    ) {
+        Row(
+            modifier = Modifier.padding(16.dp),
+            verticalAlignment = Alignment.CenterVertically
+        ) {
+            Icon(icon, contentDescription = null, modifier = Modifier.size(32.dp), tint = content)
+            Spacer(modifier = Modifier.width(16.dp))
+            Column {
+                Text(title, style = MaterialTheme.typography.h6, color = content)
+                Spacer(modifier = Modifier.height(4.dp))
+                Text(description, style = MaterialTheme.typography.body2, color = content)
+            }
+        }
+    }
+}

app/src/main/java/net/helcel/fidelity/activity/fragment/SelectEntry.kt

@@ -19,7 +19,9 @@ import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Text
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.Undo
+import androidx.compose.material.icons.filled.CreditCard
 import androidx.compose.material.icons.filled.ExpandMore
+import androidx.compose.material.icons.filled.Folder
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -32,11 +34,15 @@ import androidx.compose.ui.unit.dp
 import androidx.compose.ui.window.Dialog
 import com.kunzisoft.keepass.database.element.Group
 import com.kunzisoft.keepass.database.element.node.Node
-import net.helcel.fidelity.tools.FidelityRepository
+import net.helcel.fidelity.tools.KeepassDatabase
 
+/**
+ * Browses the loaded database. With [groupsOnly] entries are hidden, so the result is the group
+ * a new card is created in; otherwise an existing entry can be picked to attach the card to.
+ */
 @Preview
 @Composable
-fun TreeSelectorDialog(onDismiss: (Node?) -> Unit = {}) {
+fun TreeSelectorDialog(groupsOnly: Boolean = false, onDismiss: (Node?) -> Unit = {}) {
     Dialog(
         onDismissRequest = {onDismiss(null)},
         content = {
@@ -46,8 +52,8 @@ fun TreeSelectorDialog(onDismiss: (Node?) -> Unit = {}) {
                     RoundedCornerShape(8.dp)
                 )
             ) {
-                var currentRoot by remember { mutableStateOf(FidelityRepository.getRoot()) }
-                var selection by remember { mutableStateOf<Node?>(FidelityRepository.getRoot()) }
+                var currentRoot by remember { mutableStateOf(KeepassDatabase.getRoot()) }
+                var selection by remember { mutableStateOf<Node?>(KeepassDatabase.getRoot()) }
 
                 Column(
                     modifier = Modifier.fillMaxWidth().padding(8.dp)
@@ -76,32 +82,29 @@ fun TreeSelectorDialog(onDismiss: (Node?) -> Unit = {}) {
                     LazyColumn(modifier = Modifier.fillMaxHeight(0.75f)) {
                         items(currentRoot?.getChildGroups() ?: emptyList()) { entry ->
                             val isSel = (entry.nodeId == selection?.nodeId)
+                            val hasChildren = entry.getChildGroups().isNotEmpty() ||
+                                    (!groupsOnly && entry.getChildEntries().isNotEmpty())
                             Row(
                                 modifier = Modifier
                                     .fillMaxWidth()
                                     .background(color = if (isSel) MaterialTheme.colors.primary else MaterialTheme.colors.background)
                                     .clickable {
-                                        if (entry.getChildEntries().isNotEmpty()) {
-                                            currentRoot = entry
-                                            selection = entry
-                                        } else if (entry.getChildGroups().isNotEmpty()) {
-                                            currentRoot = entry
-                                            selection = entry
-                                        } else {
-                                            selection = entry
-                                        }
+                                        selection = entry
+                                        if (hasChildren) currentRoot = entry
                                     }
                                     .padding(8.dp)
                             ) {
-                                if (entry.getChildEntries().isNotEmpty() || entry.getChildGroups()
-                                        .isNotEmpty()
-                                ) {
+                                Icon(
+                                    imageVector = Icons.Default.Folder,
+                                    contentDescription = "group",
+                                    tint = if (isSel) MaterialTheme.colors.onPrimary else MaterialTheme.colors.onBackground
+                                )
+                                if (hasChildren)
                                     Icon(
                                         imageVector = Icons.Default.ExpandMore,
                                         contentDescription = null,
                                         tint = if (isSel) MaterialTheme.colors.onPrimary else MaterialTheme.colors.onBackground
                                     )
-                                }
                                 Text(
                                     entry.title,
                                     modifier = Modifier.padding(start = 8.dp),
@@ -109,7 +112,7 @@ fun TreeSelectorDialog(onDismiss: (Node?) -> Unit = {}) {
                                 )
                             }
                         }
-                        items(currentRoot?.getChildEntries() ?: emptyList()) { entry ->
+                        items(if (groupsOnly) emptyList() else currentRoot?.getChildEntries() ?: emptyList()) { entry ->
                             val isSel = (entry.nodeId == selection?.nodeId)
                             Row(
                                 modifier = Modifier
@@ -120,6 +123,11 @@ fun TreeSelectorDialog(onDismiss: (Node?) -> Unit = {}) {
                                     }
                                     .padding(8.dp)
                             ) {
+                                Icon(
+                                    imageVector = Icons.Default.CreditCard,
+                                    contentDescription = "entry",
+                                    tint = if (isSel) MaterialTheme.colors.onPrimary else MaterialTheme.colors.onBackground
+                                )
                                 Text(
                                     entry.title,
                                     modifier = Modifier.padding(start = 8.dp),

app/src/main/java/net/helcel/fidelity/activity/fragment/Setup.kt

@@ -28,6 +28,7 @@ import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.OutlinedTextField
 import androidx.compose.material.Text
+import androidx.compose.material.TextButton
 import androidx.compose.material.TextFieldDefaults
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -52,9 +53,10 @@ import kotlinx.coroutines.withContext
 import net.helcel.fidelity.activity.ToastHelper
 import net.helcel.fidelity.activity.fragment.SetupEventHandlers.onOpen
 import net.helcel.fidelity.tools.CredentialResult
-import net.helcel.fidelity.tools.FidelityRepository.genCredentials
-import net.helcel.fidelity.tools.FidelityRepository.importDB
-import net.helcel.fidelity.tools.FidelityRepository.start
+import net.helcel.fidelity.tools.KeepassDatabase
+import net.helcel.fidelity.tools.KeepassDatabase.genCredentials
+import net.helcel.fidelity.tools.KeepassDatabase.importDB
+import net.helcel.fidelity.tools.KeepassDatabase.start
 import net.helcel.fidelity.tools.KeePassStore.loadCredentials
 import net.helcel.fidelity.tools.KeePassStore.packCredentials
 import net.helcel.fidelity.tools.KeePassStore.saveCredentials
@@ -223,9 +225,6 @@ fun InitialScreen(
                         val res = onOpen(context, dbFile!!, password, keyFile)
                         if(res != null){
                             ToastHelper.show(context, "Successful... Importing")
-                            withContext(Dispatchers.IO) {
-                                start(context, dbFile!!,genCredentials(context, res))
-                            }
                             importDB(context)
                             navController!!.popBackStack()
                             navController.navigate("launcher")
@@ -238,6 +237,13 @@ fun InitialScreen(
             ) {
                 Text("Continue")
             }
+            TextButton(
+                enabled = !loading,
+                onClick = { navController!!.navigate("mode") },
+                modifier = Modifier.fillMaxWidth()
+            ) {
+                Text("Use Keepass2Android instead", color = MaterialTheme.colors.secondary)
+            }
         }
         Box(contentAlignment = Alignment.BottomCenter, modifier = Modifier
             .fillMaxSize()
@@ -254,12 +260,16 @@ fun InitialScreen(
 }
 
 object SetupEventHandlers {
+    /** Opens the file with the given credentials, then stores them for later sessions. */
     suspend fun onOpen(context: Context, db: Uri, p: String, key: Uri?): CredentialResult.Success? {
         try {
             val packCred = packCredentials(db, p, key)
-            withContext(Dispatchers.IO) {
-                    start(context, db, genCredentials(context, packCred)
-                    )
+            val opened = withContext(Dispatchers.IO) {
+                start(context, db, genCredentials(context, packCred))
+            }
+            if (!opened) {
+                ToastHelper.show(context, "Unable to open the database: check the password and key file")
+                return null
             }
 
             val res = withContext(Dispatchers.Main) {
@@ -267,7 +277,10 @@ object SetupEventHandlers {
             }
             return when (res) {
                 CredentialResult.AuthFailed, CredentialResult.NoData -> null
-                is CredentialResult.Success -> res
+                is CredentialResult.Success -> {
+                    KeepassDatabase.credentials = res
+                    res
+                }
             }
         } catch (e: Exception) {
             ToastHelper.show(context, e.message.toString())

app/src/main/java/net/helcel/fidelity/activity/fragment/ViewEntry.kt

@@ -20,6 +20,7 @@ import androidx.compose.material.CircularProgressIndicator
 import androidx.compose.material.MaterialTheme
 import androidx.compose.material.Text
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.mutableStateOf
@@ -62,11 +63,19 @@ fun ViewEntryScreen(
         activity?.window?.attributes = activity.window?.attributes?.apply {
             screenBrightness = if (isFull) 1f else BRIGHTNESS_OVERRIDE_NONE
         }
+    }
+    // Generate once per entry (not on every recomposition) and surface zxing's reason,
+    // e.g. "Contents do not pass checksum" for a mistyped EAN.
+    LaunchedEffect(entry) {
         try {
             bitmap = generateBarcode(entry.code, entry.format, 1024)
-        } catch (_: Exception) {
+        } catch (e: Exception) {
             bitmap = null
-            Toast.makeText(context, "Invalid barcode format", Toast.LENGTH_SHORT).show()
+            Toast.makeText(
+                context,
+                "Invalid barcode: " + (e.message ?: "unsupported format"),
+                Toast.LENGTH_LONG
+            ).show()
         }
     }
     BackHandler {

app/src/main/java/net/helcel/fidelity/tools/AppMode.kt

@@ -0,0 +1,39 @@
+package net.helcel.fidelity.tools
+
+import android.content.Context
+import androidx.compose.runtime.mutableStateOf
+import androidx.core.content.edit
+
+const val FIDELITY_PREFS = "fidelity_prefs"
+
+enum class AppMode {
+    /** Opens a KDBX file directly through the bundled KeePassDX engine. */
+    STANDALONE,
+
+    /** Delegates storage to the Keepass2Android app through its plugin interface. */
+    KP2A,
+}
+
+object AppModeStore {
+    private const val KEY_MODE = "app_mode"
+
+    /** Null until the user has picked a mode on the selection screen. */
+    val mode = mutableStateOf<AppMode?>(null)
+
+    val isKp2a: Boolean
+        get() = mode.value == AppMode.KP2A
+
+    fun load(context: Context): AppMode? {
+        val prefs = context.getSharedPreferences(FIDELITY_PREFS, Context.MODE_PRIVATE)
+        mode.value = prefs.getString(KEY_MODE, null)?.let { name ->
+            AppMode.entries.firstOrNull { it.name == name }
+        }
+        return mode.value
+    }
+
+    fun set(context: Context, newMode: AppMode) {
+        context.getSharedPreferences(FIDELITY_PREFS, Context.MODE_PRIVATE)
+            .edit { putString(KEY_MODE, newMode.name) }
+        mode.value = newMode
+    }
+}

app/src/main/java/net/helcel/fidelity/tools/BiometricStore.kt

@@ -2,9 +2,12 @@ package net.helcel.fidelity.tools
 
 import android.content.Context
 import android.net.Uri
+import android.os.Build
 import android.security.keystore.KeyGenParameterSpec
 import android.security.keystore.KeyProperties
 import android.util.Base64
+import android.widget.Toast
+import androidx.biometric.BiometricManager
 import androidx.biometric.BiometricPrompt
 import androidx.core.content.ContextCompat
 import javax.crypto.Cipher
@@ -16,6 +19,7 @@ import com.kunzisoft.keepass.utils.parseUri
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.flow.first
 import kotlinx.coroutines.suspendCancellableCoroutine
+import net.helcel.fidelity.activity.ToastHelper
 import java.security.KeyStore
 import javax.crypto.KeyGenerator
 import javax.crypto.SecretKey
@@ -36,6 +40,17 @@ sealed class CredentialResult {
 
 private const val KEY_ALIAS = "keepass_bio_key"
 
+// Android 11+ can unlock a keystore key with the device PIN/pattern/password as well, which
+// keeps standalone mode usable on devices without (enrolled) biometrics. Below that, a
+// CryptoObject can only be released by a biometric.
+private val deviceCredentialSupported = Build.VERSION.SDK_INT >= Build.VERSION_CODES.R
+
+private val allowedAuthenticators: Int
+    get() = if (deviceCredentialSupported)
+        BiometricManager.Authenticators.BIOMETRIC_STRONG or BiometricManager.Authenticators.DEVICE_CREDENTIAL
+    else
+        BiometricManager.Authenticators.BIOMETRIC_STRONG
+
 fun getOrCreateBiometricKey(): SecretKey {
     val keyStore = KeyStore.getInstance("AndroidKeyStore").apply { load(null) }
     keyStore.getKey(KEY_ALIAS, null)?.let { return it as SecretKey }
@@ -47,7 +62,13 @@ fun getOrCreateBiometricKey(): SecretKey {
     ).apply {
         setBlockModes(KeyProperties.BLOCK_MODE_GCM)
         setEncryptionPaddings(KeyProperties.ENCRYPTION_PADDING_NONE)
-        setUserAuthenticationRequired(true)
+        if (deviceCredentialSupported)
+            setUserAuthenticationParameters(
+                0,
+                KeyProperties.AUTH_BIOMETRIC_STRONG or KeyProperties.AUTH_DEVICE_CREDENTIAL
+            )
+        else
+            setUserAuthenticationRequired(true)
         setInvalidatedByBiometricEnrollment(true)
     }.build()
 
@@ -108,6 +129,17 @@ object KeePassStore {
 suspend fun showBiometricPrompt(activity: FragmentActivity, enc: Boolean): Cipher? {
     val prefs = activity.securePrefs.data.first()
     return suspendCancellableCoroutine { cont ->
+        val status = BiometricManager.from(activity).canAuthenticate(allowedAuthenticators)
+        if (status != BiometricManager.BIOMETRIC_SUCCESS) {
+            ToastHelper.show(
+                activity,
+                if (deviceCredentialSupported) "Set up a screen lock or fingerprint first"
+                else "Enroll a fingerprint first",
+                Toast.LENGTH_LONG
+            )
+            cont.resume(null) { _, _, _ -> }
+            return@suspendCancellableCoroutine
+        }
         val executor = ContextCompat.getMainExecutor(activity)
         val biometricPrompt = BiometricPrompt(
             activity,
@@ -119,20 +151,22 @@ suspend fun showBiometricPrompt(activity: FragmentActivity, enc: Boolean): Ciphe
                 override fun onAuthenticationError(code: Int, msg: CharSequence) {
                     cont.resume(null) { _, _, _ -> }
                 }
-                override fun onAuthenticationFailed() {
-                    cont.resume(null) { _, _, _ -> }
-                }
+                // onAuthenticationFailed is a retryable miss: the prompt stays open, so the
+                // coroutine must stay suspended until it either succeeds or errors out.
             }
         )
         val iv = if(enc) null else prefs[KeePassKeys.IV]?.let { Base64.decode(it, Base64.DEFAULT) }
         if (!enc && iv == null) {
             cont.resume(null) { _, _, _ -> }
+            return@suspendCancellableCoroutine
         }
         val cipher = getCipherForDecryption(getOrCreateBiometricKey(), iv)
         val promptInfo = BiometricPrompt.PromptInfo.Builder()
             .setTitle("Unlock KeePass")
             .setSubtitle("Authenticate to access your KeePass database")
-            .setNegativeButtonText("Cancel")
+            .setAllowedAuthenticators(allowedAuthenticators)
+            // A negative button is mandatory without, and forbidden with, device credential.
+            .apply { if (!deviceCredentialSupported) setNegativeButtonText("Cancel") }
             .build()
 
         biometricPrompt.authenticate(promptInfo, BiometricPrompt.CryptoObject(cipher))

app/src/main/java/net/helcel/fidelity/tools/FidelityEntry.kt

@@ -0,0 +1,29 @@
+package net.helcel.fidelity.tools
+
+import kotlinx.serialization.Serializable
+
+/** Names of the custom KeePass fields a card is stored in. */
+object FidelityKeepassFields {
+    const val FIDELITYFORMAT = "FidelityFormat"
+    const val FIDELITYCODE = "FidelityCode"
+}
+
+/**
+ * A loyalty card as shown by the app.
+ *
+ * [uid] is the KeePass entry UUID in standalone mode, or the id Keepass2Android reports
+ * (falling back to a title-derived one) in plugin mode. The last three fields are
+ * per-device preferences that never reach the database.
+ */
+@Serializable
+data class FidelityEntry(
+    val uid: String? = null,
+    val title: String = "",
+    val code: String = "",
+    val format: String = "",
+    val protected: Boolean = false,
+
+    val hidden: Boolean = false,
+    val pinned: Boolean = false,
+    val lastUse: Int = 0,
+)

app/src/main/java/net/helcel/fidelity/tools/FidelityRepository.kt

@@ -0,0 +1,82 @@
+package net.helcel.fidelity.tools
+
+import android.content.Context
+import androidx.compose.runtime.mutableStateListOf
+import androidx.compose.runtime.mutableStateOf
+import androidx.core.content.edit
+import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.serialization.json.Json
+
+/**
+ * The on-device list of cards shown by the launcher, persisted in shared preferences.
+ *
+ * In standalone mode it mirrors the cards found in the KDBX file (see
+ * [KeepassDatabase.importDB]); in Keepass2Android mode it is a cache of the entries the
+ * user has fetched so far.
+ */
+object FidelityRepository {
+    val entries = mutableStateListOf<FidelityEntry>()
+
+    /** Card being edited on the create screen. */
+    val activeEntry = mutableStateOf(FidelityEntry())
+
+    /** Entry handed over by Keepass2Android for viewing without being cached. */
+    val transientEntry = mutableStateOf<FidelityEntry?>(null)
+
+    // Each mode keeps its own cache: standalone uids are KDBX UUIDs, KP2A ones are not.
+    private fun entriesKey() = if (AppModeStore.isKp2a) "entries_kp2a" else "entries"
+
+    fun saveEntries(context: Context) {
+        val prefs = context.getSharedPreferences(FIDELITY_PREFS, Context.MODE_PRIVATE)
+        // In KP2A mode "protected" means the code must never leave the KP2A database.
+        val persisted = if (AppModeStore.isKp2a) entries.filter { !it.protected } else entries
+        prefs.edit { putString(entriesKey(), Json.encodeToString(
+            ListSerializer(FidelityEntry.serializer()),
+            persisted
+        )) }
+    }
+
+    fun loadEntries(context: Context) {
+        val prefs = context.getSharedPreferences(FIDELITY_PREFS, Context.MODE_PRIVATE)
+        entries.clear()
+        try {
+            val json = prefs.getString(entriesKey(), null) ?: return
+            val list = Json.decodeFromString(
+                ListSerializer(FidelityEntry.serializer()),
+                json
+            )
+            entries.addAll(list)
+        }catch(_: Exception){
+            prefs.edit{ putString(entriesKey(),Json.encodeToString(
+                ListSerializer(FidelityEntry.serializer()),emptyList()))
+            }
+        }
+    }
+
+    /**
+     * Upserts an entry coming from Keepass2Android into the local cache, keeping the
+     * per-device flags (pin/hide/last use) of the entry it replaces. Matching also
+     * falls back to title+code because an optimistically cached entry gets a local uid
+     * until KP2A returns it with its own.
+     */
+    fun cacheEntry(context: Context, entry: FidelityEntry) {
+        val idx = entries.indexOfFirst {
+            it.uid == entry.uid || (it.title == entry.title && it.code == entry.code)
+        }
+        if (idx >= 0) {
+            val old = entries[idx]
+            entries[idx] = entry.copy(pinned = old.pinned, hidden = old.hidden, lastUse = old.lastUse)
+        } else {
+            entries.add(entry)
+        }
+        saveEntries(context)
+    }
+
+    fun removeEntry(context: Context, entry: FidelityEntry) {
+        entries.removeIf { it.uid == entry.uid }
+        saveEntries(context)
+    }
+
+    fun findEntry(uid: String?): FidelityEntry? =
+        entries.find { it.uid == uid } ?: transientEntry.value?.takeIf { it.uid == uid }
+}

app/src/main/java/net/helcel/fidelity/tools/KeepassDatabase.kt

@@ -2,12 +2,6 @@ package net.helcel.fidelity.tools
 
 import android.content.Context
 import android.net.Uri
-import androidx.compose.runtime.mutableStateListOf
-import androidx.compose.runtime.mutableStateOf
-import kotlinx.serialization.Serializable
-import java.io.ByteArrayInputStream
-import kotlinx.serialization.json.Json
-import androidx.core.content.edit
 import com.kunzisoft.keepass.database.element.Database
 import com.kunzisoft.keepass.database.element.Field
 import com.kunzisoft.keepass.database.element.Group
@@ -17,39 +11,75 @@ import com.kunzisoft.keepass.database.element.node.NodeIdUUID
 import com.kunzisoft.keepass.database.element.security.ProtectedString
 import com.kunzisoft.keepass.hardware.HardwareKey
 import com.kunzisoft.keepass.utils.getBinaryDir
-import kotlinx.serialization.builtins.ListSerializer
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import net.helcel.fidelity.activity.ToastHelper
+import net.helcel.fidelity.tools.FidelityRepository.entries
+import net.helcel.fidelity.tools.FidelityRepository.saveEntries
+import net.helcel.fidelity.tools.KeePassStore.loadCredentials
+import java.io.ByteArrayInputStream
 import java.io.File
 import java.util.UUID
 
-object FidelityKeepassFields {
-    const val FIDELITYFORMAT = "FidelityFormat"
-    const val FIDELITYCODE = "FidelityCode"
-}
-
-@Serializable
-data class FidelityEntry(
-    val uid: String? = null,
-    val title: String = "",
-    val code: String = "",
-    val format: String = "",
-    val protected: Boolean = false,
-
-    val hidden: Boolean = false,
-    val pinned: Boolean = false,
-    val lastUse: Int = 0,
-)
-
-object FidelityRepository {
+/**
+ * Standalone mode: the KDBX file opened through the bundled KeePassDX engine.
+ *
+ * [unlock] and [save] are the session-level operations the screens use; the rest is the
+ * raw file handling underneath them.
+ */
+object KeepassDatabase {
     private var db: Database = Database()
     private var binaryDir: File? = null
-    val entries = mutableStateListOf<FidelityEntry>()
-    val activeEntry = mutableStateOf(FidelityEntry())
 
+    /** Credentials released by the user for this process, so authentication happens once. */
+    var credentials: CredentialResult.Success? = null
 
     fun getRoot(): Group? {
         return db.rootGroup
     }
 
+    /** Makes sure [credentials] are available, asking the user to authenticate if needed. */
+    suspend fun ensureCredentials(context: Context): Boolean {
+        if (credentials != null) return true
+        return when (val res = loadCredentials(context)) {
+            is CredentialResult.Success -> {
+                credentials = res
+                true
+            }
+            CredentialResult.AuthFailed, CredentialResult.NoData -> {
+                ToastHelper.show(context, "Unable to Load Credentials")
+                false
+            }
+        }
+    }
+
+    /** Opens the file with [credentials] and imports its cards into [FidelityRepository]. */
+    suspend fun unlock(context: Context): Boolean {
+        val cred = credentials ?: return false
+        val opened = withContext(Dispatchers.IO) {
+            start(context, cred.db, genCredentials(context, cred))
+        }
+        if (!opened) {
+            ToastHelper.show(context, "Unable to open the database")
+            return false
+        }
+        importDB(context)
+        return true
+    }
+
+    /** Writes the database back to its file. */
+    suspend fun save(context: Context): Boolean {
+        val cred = credentials ?: return false
+        val saved = try {
+            withContext(Dispatchers.IO) { end(context, cred.db, genCredentials(context, cred)) }
+        } catch (e: Exception) {
+            println(e)
+            false
+        }
+        if (!saved) ToastHelper.show(context, "Unable to save the database")
+        return saved
+    }
+
     fun start(ctx: Context, uri: Uri?, c: MasterCredential): Boolean {
         if (binaryDir == null) binaryDir = ctx.getBinaryDir()
         if (uri == null) return false
@@ -90,6 +120,7 @@ object FidelityRepository {
         )
     }
 
+    /** Replaces the card list with the cards found in the database, keeping per-device flags. */
     fun importDB(context: Context) {
         val seenID= arrayListOf<String>()
         fun importDBRec(group: Group) {
@@ -119,8 +150,6 @@ object FidelityRepository {
                 } else {
                     entries.add(newEntry)
                 }
-
-
             }
             group.getChildGroups().forEach { importDBRec(it) }
         }
@@ -133,36 +162,19 @@ object FidelityRepository {
         saveEntries(context)
     }
 
-    fun saveEntries(context: Context) {
-        val prefs = context.getSharedPreferences("fidelity_prefs", Context.MODE_PRIVATE)
-        prefs.edit { putString("entries", Json.encodeToString(
-            ListSerializer(FidelityEntry.serializer()),
-            entries
-        )) }
-    }
-
-    fun loadEntries(context: Context) {
-        val prefs = context.getSharedPreferences("fidelity_prefs", Context.MODE_PRIVATE)
-        try {
-            val json = prefs.getString("entries", null) ?: return
-            val list = Json.decodeFromString(
-                ListSerializer(FidelityEntry.serializer()),
-                json
-            )
-
-            entries.clear()
-            entries.addAll(list)
-        }catch(_: Exception){
-            prefs.edit{ putString("entries",Json.encodeToString(
-                ListSerializer(FidelityEntry.serializer()),emptyList()))
-            }
-        }
-    }
-
+    /**
+     * Writes the card into the loaded database. [FidelityEntry.uid] is either the id of an
+     * existing entry, which is updated in place, or the id of the group to create it in.
+     */
     fun addEntry(ctx: Context, entry: FidelityEntry) {
-        val dbEntry = db.getEntryById(NodeIdUUID(UUID.fromString(entry.uid))) ?: db.createEntry()
-        val dbParent = db.getGroupById(NodeIdUUID(UUID.fromString(entry.uid)))
-        dbEntry?.apply {
+        val id = NodeIdUUID(UUID.fromString(entry.uid))
+        val existing = db.getEntryById(id)
+        val dbEntry = existing ?: db.createEntry() ?: return
+        dbEntry.apply {
+            title = entry.title
+            // Keepass2Android lists entries for this app by URL, so cards written here stay
+            // reachable from KP2A mode as well.
+            if (url.isBlank()) url = Kp2a.appUrl(ctx)
             putExtraField(
                 Field(
                     FidelityKeepassFields.FIDELITYCODE,
@@ -175,11 +187,11 @@ object FidelityRepository {
                     ProtectedString(true, entry.format.toCharArray())
                 )
             )
-            if(dbParent!=null) title = entry.title
-            dbParent?.addChildEntry(dbEntry)
         }
+        if (existing != null) db.updateEntry(dbEntry)
+        else db.addEntryTo(dbEntry, db.getGroupById(id) ?: db.rootGroup ?: return)
         entries.removeIf {it.uid == entry.uid}
-        entries.add(entry.copy(uid=dbEntry?.nodeId?.id.toString()))
+        entries.add(entry.copy(uid=dbEntry.nodeId.id.toString()))
         saveEntries(ctx)
     }
 }

app/src/main/java/net/helcel/fidelity/tools/Kp2a.kt

@@ -0,0 +1,109 @@
+package net.helcel.fidelity.tools
+
+import android.content.ActivityNotFoundException
+import android.content.Context
+import android.content.Intent
+import androidx.activity.result.ActivityResultLauncher
+import net.helcel.fidelity.activity.ToastHelper
+import net.helcel.fidelity.pluginSDK.KeepassDef
+import net.helcel.fidelity.pluginSDK.Kp2aControl
+import net.helcel.fidelity.pluginSDK.Strings
+import org.json.JSONArray
+import org.json.JSONException
+import java.util.UUID
+
+/**
+ * Bridge between [FidelityEntry] and the Keepass2Android plugin interface.
+ *
+ * Entries live in the KP2A database; this app only keeps a local cache of the
+ * non-protected ones (see [FidelityRepository.cacheEntry]).
+ */
+object Kp2a {
+    private const val CODE_FIELD = FidelityKeepassFields.FIDELITYCODE
+    private const val FORMAT_FIELD = FidelityKeepassFields.FIDELITYFORMAT
+
+    // Legacy flag written by pre-1.3 versions: "true" means "do not cache locally".
+    private const val PROTECT_CODE_FIELD = "FidelityProtectedCode"
+
+    private const val NOT_INSTALLED = "Keepass2Android Not Installed"
+
+    /** URL that marks a database entry as belonging to this app. */
+    fun appUrl(context: Context): String = "androidapp://" + context.packageName
+
+    fun isAvailable(context: Context): Boolean =
+        Kp2aControl.getQueryEntryForOwnPackageIntent()
+            .resolveActivity(context.packageManager) != null
+
+    /** Asks KP2A to pick one of the entries whose URL points at this app. */
+    fun launchQuery(context: Context, launcher: ActivityResultLauncher<Intent>): Boolean {
+        return try {
+            launcher.launch(Kp2aControl.getQueryEntryForOwnPackageIntent())
+            true
+        } catch (_: ActivityNotFoundException) {
+            ToastHelper.show(context, NOT_INSTALLED)
+            false
+        }
+    }
+
+    /**
+     * Opens KP2A on a pre-filled "new entry" form. KP2A runs in its own task, so no
+     * activity result comes back: the caller must cache the entry optimistically.
+     */
+    fun launchAdd(context: Context, entry: FidelityEntry): Boolean {
+        val fields = HashMap<String, String>()
+        fields[KeepassDef.TitleField] = entry.title
+        fields[KeepassDef.UrlField] = appUrl(context)
+        fields[CODE_FIELD] = entry.code
+        fields[FORMAT_FIELD] = entry.format
+        fields[PROTECT_CODE_FIELD] = entry.protected.toString()
+        val protectedFields = if (entry.protected) arrayListOf(CODE_FIELD) else null
+
+        return try {
+            context.startActivity(Kp2aControl.getAddEntryIntent(fields, protectedFields))
+            true
+        } catch (_: ActivityNotFoundException) {
+            ToastHelper.show(context, NOT_INSTALLED)
+            false
+        }
+    }
+
+    /** Stable id for entries KP2A did not tag with its own UUID. */
+    fun localUid(title: String): String =
+        UUID.nameUUIDFromBytes("kp2a:$title".toByteArray(Charsets.UTF_8)).toString()
+
+    /**
+     * Extracts a fidelity entry from an intent produced by KP2A (query result, or the
+     * launch intent when the user opens this app from an entry). Returns null when the
+     * intent carries no fidelity data.
+     */
+    fun entryFromIntent(intent: Intent?): FidelityEntry? {
+        if (intent?.hasExtra(Strings.EXTRA_ENTRY_OUTPUT_DATA) != true) return null
+        val fields = Kp2aControl.getEntryFieldsFromIntent(intent)
+        val code = fields[CODE_FIELD] ?: return null
+        val format = fields[FORMAT_FIELD] ?: return null
+        val title = fields[KeepassDef.TitleField] ?: ""
+
+        val protected = fields[PROTECT_CODE_FIELD]?.toBooleanStrictOrNull()
+            ?: protectedFieldsFromIntent(intent).contains(CODE_FIELD)
+
+        return FidelityEntry(
+            uid = intent.getStringExtra(Strings.EXTRA_ENTRY_ID) ?: localUid(title),
+            title = title,
+            code = code,
+            format = format,
+            protected = protected,
+        )
+    }
+
+    // KP2A sends the protected field names either as a string list or a JSON array.
+    private fun protectedFieldsFromIntent(intent: Intent): List<String> {
+        intent.getStringArrayListExtra(Strings.EXTRA_PROTECTED_FIELDS_LIST)?.let { return it }
+        val json = intent.getStringExtra(Strings.EXTRA_PROTECTED_FIELDS_LIST) ?: return emptyList()
+        return try {
+            val a = JSONArray(json)
+            List(a.length()) { a.optString(it) }
+        } catch (_: JSONException) {
+            emptyList()
+        }
+    }
+}