Added clearing list

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

@@ -1,7 +1,9 @@
 package net.helcel.fidelity.activity
 
+import android.annotation.SuppressLint
 import android.content.Context
 import android.content.SharedPreferences
+import android.content.pm.ActivityInfo
 import android.os.Bundle
 import androidx.activity.addCallback
 import androidx.appcompat.app.AppCompatActivity
@@ -10,38 +12,38 @@ import net.helcel.fidelity.activity.fragment.Launcher
 import net.helcel.fidelity.databinding.ActMainBinding
 import net.helcel.fidelity.tools.CacheManager
 
+@SuppressLint("SourceLockedOrientationActivity")
 class MainActivity : AppCompatActivity() {
 
     private lateinit var binding: ActMainBinding
-
     private lateinit var sharedPreferences: SharedPreferences
 
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         sharedPreferences =
             this.getSharedPreferences(CacheManager.PREF_NAME, Context.MODE_PRIVATE)
         CacheManager.loadFidelity(sharedPreferences)
 
-        
         binding = ActMainBinding.inflate(layoutInflater)
         setContentView(binding.root)
 
         onBackPressedDispatcher.addCallback(this) {
             if (supportFragmentManager.backStackEntryCount > 0) {
                 supportFragmentManager.popBackStackImmediate()
+                loadLauncher()
+                requestedOrientation = ActivityInfo.SCREEN_ORIENTATION_PORTRAIT
             } else {
                 finish()
             }
         }
+
         if (savedInstanceState == null)
             loadLauncher()
-
     }
 
     private fun loadLauncher() {
         supportFragmentManager.beginTransaction()
-            .add(R.id.container, Launcher())
+            .replace(R.id.container, Launcher())
             .commit()
     }
 }