replace Fragment for navHostFragment with FragmentContainerView

android_app/app/build.gradle

@@ -159,7 +159,7 @@ dependencies {
     // CustomActivityOnCrash
     implementation 'cat.ereza:customactivityoncrash:2.3.0'
     // AppIntro
-    implementation 'com.github.AppIntro:AppIntro:6.0.0'
+    implementation 'com.github.AppIntro:AppIntro:6.2.0'
     implementation 'org.jetbrains.kotlin:kotlin-stdlib:1.4.31'
     // Room
     implementation 'androidx.room:room-runtime:2.4.3'

android_app/app/src/main/java/com/health/openscale/gui/MainActivity.java

@@ -66,6 +66,7 @@ import androidx.core.view.GravityCompat;
 import androidx.drawerlayout.widget.DrawerLayout;
 import androidx.navigation.NavController;
 import androidx.navigation.Navigation;
+import androidx.navigation.fragment.NavHostFragment;
 import androidx.navigation.ui.AppBarConfiguration;
 import androidx.navigation.ui.NavigationUI;
 
@@ -199,7 +200,7 @@ public class MainActivity extends AppCompatActivity
                 R.id.nav_overview, R.id.nav_graph, R.id.nav_table, R.id.nav_statistic, R.id.nav_main_preferences)
                 .setOpenableLayout(drawerLayout)
                 .build();
-        navController = Navigation.findNavController(this, R.id.nav_host_fragment);
+        navController = ((NavHostFragment)getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment)).getNavController();
         NavigationUI.setupActionBarWithNavController(this, navController, mAppBarConfiguration);
         NavigationUI.setupWithNavController(navigationView, navController);
         NavigationUI.setupWithNavController(navigationBottomView, navController);

android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothPreferences.java

@@ -28,6 +28,7 @@ import androidx.annotation.Nullable;
 import androidx.lifecycle.Observer;
 import androidx.navigation.NavDirections;
 import androidx.navigation.Navigation;
+import androidx.navigation.fragment.NavHostFragment;
 import androidx.preference.Preference;
 import androidx.preference.PreferenceFragmentCompat;
 
@@ -79,14 +80,15 @@ public class BluetoothPreferences extends PreferenceFragmentCompat {
 
         View view = super.onCreateView(inflater, container, savedInstanceState);
 
-        Navigation.findNavController(requireActivity(), R.id.nav_host_fragment).getCurrentBackStackEntry().getSavedStateHandle().getLiveData("update", false).observe(getViewLifecycleOwner(), new Observer<Boolean>() {
+        NavHostFragment navHostFragment = (NavHostFragment) getActivity().getSupportFragmentManager().findFragmentById(R.id.nav_host_fragment);
-            @Override
+        navHostFragment.getNavController().getCurrentBackStackEntry().getSavedStateHandle().getLiveData("update", false).observe(getViewLifecycleOwner(), new Observer<Boolean>() {
-            public void onChanged(Boolean aBoolean) {
+                @Override
-                if (aBoolean) {
+                public void onChanged(Boolean aBoolean) {
-                    btScanner.setSummary(getCurrentDeviceName());
+                    if (aBoolean) {
+                        btScanner.setSummary(getCurrentDeviceName());
+                    }
                 }
-            }
+            });
-        });
 
         return view;
     }

android_app/app/src/main/java/com/health/openscale/gui/preferences/BluetoothSettingsFragment.java

@@ -87,6 +87,7 @@ public class BluetoothSettingsFragment extends Fragment {
     private ProgressBar progressBar;
     private Handler progressHandler;
     private BluetoothCentralManager central;
+    private Context context;
 
     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
@@ -98,6 +99,8 @@ public class BluetoothSettingsFragment extends Fragment {
         txtSearching = root.findViewById(R.id.txtSearching);
         progressBar = root.findViewById(R.id.progressBar);
 
+        context = root.getContext();
+
         return root;
     }
 
@@ -113,9 +116,9 @@ public class BluetoothSettingsFragment extends Fragment {
 
         Timber.d("Bluetooth settings Bluetooth permission check");
 
-        int targetSdkVersion = getActivity().getApplicationInfo().targetSdkVersion;
+        int targetSdkVersion = context.getApplicationInfo().targetSdkVersion;
 
-        final BluetoothManager bluetoothManager = (BluetoothManager) getActivity().getSystemService(Context.BLUETOOTH_SERVICE);
+        final BluetoothManager bluetoothManager = (BluetoothManager) context.getSystemService(Context.BLUETOOTH_SERVICE);
         BluetoothAdapter btAdapter = bluetoothManager.getAdapter();
 
         // Check if Bluetooth is enabled
@@ -127,7 +130,7 @@ public class BluetoothSettingsFragment extends Fragment {
         }
 
             // Check if Bluetooth 4.x is available
-        if (!getActivity().getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
+        if (!context.getPackageManager().hasSystemFeature(PackageManager.FEATURE_BLUETOOTH_LE)) {
             Timber.d("No Bluetooth 4.x available");
             Toast.makeText(getContext(), "Bluetooth 4.x " + getContext().getResources().getString(R.string.info_is_not_available), Toast.LENGTH_SHORT).show();
             stepNavigationBack();
@@ -135,11 +138,11 @@ public class BluetoothSettingsFragment extends Fragment {
         }
 
         // Check if GPS or Network location service is enabled
-        LocationManager locationManager = (LocationManager) getActivity().getSystemService(LOCATION_SERVICE);
+        LocationManager locationManager = (LocationManager) context.getSystemService(LOCATION_SERVICE);
         if (!(locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER))) {
             Timber.d("No GPS or Network location service is enabled, ask user for permission");
 
-            AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
+            AlertDialog.Builder builder = new AlertDialog.Builder(context);
             builder.setTitle(R.string.permission_bluetooth_info_title);
             builder.setIcon(R.drawable.ic_preferences_about);
             builder.setMessage(R.string.permission_location_service_info);
@@ -147,15 +150,19 @@ public class BluetoothSettingsFragment extends Fragment {
                 public void onClick(DialogInterface dialogInterface, int i) {
                     // Show location settings when the user acknowledges the alert dialog
                     Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
-                    getActivity().startActivity(intent);
+                    context.startActivity(intent);
+                }
+            });
+            builder.setNegativeButton(R.string.label_no, new DialogInterface.OnClickListener() {
+                @Override
+                public void onClick(DialogInterface dialogInterface, int i) {
+                    stepNavigationBack();
                 }
             });
 
             Dialog alertDialog = builder.create();
             alertDialog.setCanceledOnTouchOutside(false);
             alertDialog.show();
-
-            stepNavigationBack();
             return;
         }
 
@@ -175,7 +182,7 @@ public class BluetoothSettingsFragment extends Fragment {
         if (hasPermissions(requiredPermissions)) {
             startBluetoothDiscovery();
         } else if (shouldShowRequestPermissionRationale(Manifest.permission.ACCESS_FINE_LOCATION)) {
-            AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+            AlertDialog.Builder builder = new AlertDialog.Builder(context);
             Timber.d("No access fine location permission granted");
 
             builder.setMessage(R.string.permission_bluetooth_info)
@@ -193,7 +200,7 @@ public class BluetoothSettingsFragment extends Fragment {
             alertDialog.show();
 
         } else if (shouldShowRequestPermissionRationale(Manifest.permission.BLUETOOTH_SCAN)) {
-        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
+        AlertDialog.Builder builder = new AlertDialog.Builder(context);
         Timber.d("No access Bluetooth scan permission granted");
 
         builder.setMessage(R.string.permission_bluetooth_info)
@@ -476,11 +483,7 @@ public class BluetoothSettingsFragment extends Fragment {
 
             stopBluetoothDiscovery();
 
-            if (getActivity().findViewById(R.id.nav_host_fragment) != null){
+            stepNavigationBack();
-                Navigation.findNavController(requireActivity(), R.id.nav_host_fragment).getPreviousBackStackEntry().getSavedStateHandle().set("update", true);
-                Navigation.findNavController(requireActivity(), R.id.nav_host_fragment).navigateUp();
-            } else
-                getActivity().finish();
             }
     }
 

android_app/app/src/main/java/com/health/openscale/gui/slides/SlideToNavigationAdapter.java

@@ -20,8 +20,9 @@ import android.view.View;
 
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.Toolbar;
+import androidx.navigation.NavController;
 import androidx.navigation.NavDirections;
-import androidx.navigation.Navigation;
+import androidx.navigation.fragment.NavHostFragment;
 
 import com.health.openscale.R;
 import com.health.openscale.SlideNavigationDirections;
@@ -67,7 +68,9 @@ public class SlideToNavigationAdapter extends AppCompatActivity {
         }
 
         if (action != null) {
-            Navigation.findNavController(this, R.id.nav_slide_navigation).navigate(action);
+            NavController navController = ((NavHostFragment)getSupportFragmentManager().findFragmentById(R.id.nav_slide_navigation)).getNavController();
+
+            navController.navigate(action);
         }
     }
 }

android_app/app/src/main/res/layout/activity_main.xml

@@ -31,7 +31,7 @@
 
             <!-- action_menumain content view where fragments are loaded -->
 
-            <fragment
+            <androidx.fragment.app.FragmentContainerView
                 android:id="@+id/nav_host_fragment"
                 android:name="androidx.navigation.fragment.NavHostFragment"
                 android:layout_width="match_parent"

android_app/app/src/main/res/layout/activity_slidetonavigation.xml

@@ -16,7 +16,7 @@
         android:background="?attr/colorPrimaryDark">
     </androidx.appcompat.widget.Toolbar>
 
-    <fragment
+    <androidx.fragment.app.FragmentContainerView
         android:name="androidx.navigation.fragment.NavHostFragment"
         app:navGraph="@navigation/slide_navigation"
         app:defaultNavHost="false"