Clear activity views

app/src/main/java/eu/faircode/email/ActivityBase.java

@@ -20,7 +20,6 @@ package eu.faircode.email;
 */
 
 import android.Manifest;
-import android.animation.Animator;
 import android.app.ActivityManager;
 import android.content.ComponentName;
 import android.content.Context;
@@ -60,14 +59,11 @@ import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.OnLifecycleEvent;
 import androidx.preference.PreferenceManager;
-import androidx.recyclerview.selection.SelectionTracker;
-import androidx.recyclerview.widget.RecyclerView;
 
 import java.io.File;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
 import java.io.InputStream;
-import java.lang.reflect.Field;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashMap;
@@ -807,26 +803,7 @@ abstract class ActivityBase extends AppCompatActivity implements SharedPreferenc
         @Override
         public void onFragmentViewDestroyed(@NonNull FragmentManager fm, @NonNull Fragment f) {
             log(fm, f, "onFragmentViewDestroyed");
-            try {
-                for (Field field : f.getClass().getDeclaredFields()) {
-                    Class<?> type = field.getType();
-                    if (View.class.isAssignableFrom(type) ||
-                            Animator.class.isAssignableFrom(type) ||
-                            SelectionTracker.class.isAssignableFrom(type) ||
-                            SelectionTracker.SelectionPredicate.class.isAssignableFrom(type) ||
-                            RecyclerView.Adapter.class.isAssignableFrom(type)) {
-                        Log.i("Clearing " + f.getClass().getSimpleName() + ":" + field.getName());
-                        field.setAccessible(true);
-
-                        if (Animator.class.isAssignableFrom(type))
-                            ((Animator) field.get(f)).setTarget(null);
-
-                        field.set(f, null);
-                    }
-                }
-            } catch (Throwable ex) {
-                Log.w(ex);
-            }
+            Helper.clearViews(f);
         }
 
         @Override

app/src/main/java/eu/faircode/email/ActivityView.java

@@ -1047,10 +1047,6 @@ public class ActivityView extends ActivityBilling implements FragmentManager.OnB
 
     @Override
     protected void onDestroy() {
-        if (lastSnackbar != null) {
-            lastSnackbar.setAction(null, null);
-            lastSnackbar = null;
-        }
         LocalBroadcastManager lbm = LocalBroadcastManager.getInstance(this);
         lbm.unregisterReceiver(creceiver);
         super.onDestroy();

app/src/main/java/eu/faircode/email/ApplicationEx.java

@@ -766,6 +766,8 @@ public class ApplicationEx extends Application
         @Override
         public void onActivityDestroyed(@NonNull Activity activity) {
             log(activity, "onActivityDestroyed");
+            Helper.clearViews(activity);
+
         }
 
         @Override

app/src/main/java/eu/faircode/email/Helper.java

@@ -23,6 +23,7 @@ import static android.os.Process.THREAD_PRIORITY_BACKGROUND;
 import static androidx.browser.customtabs.CustomTabsService.ACTION_CUSTOM_TABS_CONNECTION;
 
 import android.Manifest;
+import android.animation.Animator;
 import android.animation.ObjectAnimator;
 import android.animation.ValueAnimator;
 import android.app.Activity;
@@ -108,6 +109,7 @@ import androidx.lifecycle.LifecycleObserver;
 import androidx.lifecycle.LifecycleOwner;
 import androidx.lifecycle.OnLifecycleEvent;
 import androidx.preference.PreferenceManager;
+import androidx.recyclerview.selection.SelectionTracker;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.google.android.material.bottomnavigation.BottomNavigationView;
@@ -1270,6 +1272,35 @@ public class Helper {
         return fragment.getClass().getName() + ":result:" + who;
     }
 
+    static void clearViews(Object instance) {
+        try {
+            for (Field field : instance.getClass().getDeclaredFields()) {
+                Class<?> type = field.getType();
+                if (View.class.isAssignableFrom(type) ||
+                        Animator.class.isAssignableFrom(type) ||
+                        Snackbar.class.isAssignableFrom(type) ||
+                        SelectionTracker.class.isAssignableFrom(type) ||
+                        SelectionTracker.SelectionPredicate.class.isAssignableFrom(type) ||
+                        RecyclerView.Adapter.class.isAssignableFrom(type)) {
+                    Log.i("Clearing " + instance.getClass().getSimpleName() + ":" + field.getName());
+
+                    field.setAccessible(true);
+
+                    if (Animator.class.isAssignableFrom(type))
+                        ((Animator) field.get(instance)).setTarget(null);
+
+                    if (Snackbar.class.isAssignableFrom(type)) {
+                        ((Snackbar) field.get(instance)).setAction(null, null);
+                    }
+
+                    field.set(instance, null);
+                }
+            }
+        } catch (Throwable ex) {
+            Log.w(ex);
+        }
+    }
+
     // Graphics
 
     static int dp2pixels(Context context, int dp) {