Fix app crashes when opening a very long private message.

app/src/main/java/ml/docilealligator/infinityforreddit/activities/InboxActivity.java

@@ -54,9 +54,12 @@ import ml.docilealligator.infinityforreddit.apis.RedditAPI;
 import ml.docilealligator.infinityforreddit.asynctasks.SwitchAccount;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.events.ChangeInboxCountEvent;
+import ml.docilealligator.infinityforreddit.events.PassPrivateMessageEvent;
+import ml.docilealligator.infinityforreddit.events.PassPrivateMessageIndexEvent;
 import ml.docilealligator.infinityforreddit.events.SwitchAccountEvent;
 import ml.docilealligator.infinityforreddit.fragments.InboxFragment;
 import ml.docilealligator.infinityforreddit.message.FetchMessage;
+import ml.docilealligator.infinityforreddit.message.Message;
 import ml.docilealligator.infinityforreddit.utils.APIUtils;
 import ml.docilealligator.infinityforreddit.utils.SharedPreferencesUtils;
 import ml.docilealligator.infinityforreddit.utils.Utils;
@@ -378,6 +381,13 @@ public class InboxActivity extends BaseActivity implements ActivityToolbarInterf
         }
     }
 
+    @Subscribe
+    public void onPassPrivateMessageIndexEvent(PassPrivateMessageIndexEvent event) {
+        if (sectionsPagerAdapter != null) {
+            EventBus.getDefault().post(new PassPrivateMessageEvent(sectionsPagerAdapter.getPrivateMessage(event.privateMessageIndex)));
+        }
+    }
+
     @Override
     public void onLongPress() {
         if (sectionsPagerAdapter != null) {
@@ -442,6 +452,17 @@ public class InboxActivity extends BaseActivity implements ActivityToolbarInterf
             }
         }
 
+        Message getPrivateMessage(int index) {
+            if (viewPager2 == null || fragmentManager == null) {
+                return null;
+            }
+            Fragment fragment = fragmentManager.findFragmentByTag("f" + viewPager2.getCurrentItem());
+            if (fragment instanceof InboxFragment) {
+                return ((InboxFragment) fragment).getMessageByIndex(index);
+            }
+            return null;
+        }
+
         @NonNull
         @Override
         public Fragment createFragment(int position) {

app/src/main/java/ml/docilealligator/infinityforreddit/activities/ViewPrivateMessagesActivity.java

@@ -22,6 +22,7 @@ import com.google.android.material.appbar.AppBarLayout;
 import com.google.android.material.snackbar.Snackbar;
 
 import org.greenrobot.eventbus.EventBus;
+import org.greenrobot.eventbus.Subscribe;
 
 import java.util.ArrayList;
 import java.util.concurrent.Executor;
@@ -39,6 +40,8 @@ import ml.docilealligator.infinityforreddit.adapters.PrivateMessagesDetailRecycl
 import ml.docilealligator.infinityforreddit.asynctasks.LoadUserData;
 import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
+import ml.docilealligator.infinityforreddit.events.PassPrivateMessageEvent;
+import ml.docilealligator.infinityforreddit.events.PassPrivateMessageIndexEvent;
 import ml.docilealligator.infinityforreddit.events.RepliedToPrivateMessageEvent;
 import ml.docilealligator.infinityforreddit.message.Message;
 import ml.docilealligator.infinityforreddit.message.ReadMessage;
@@ -48,9 +51,10 @@ import retrofit2.Retrofit;
 
 public class ViewPrivateMessagesActivity extends BaseActivity implements ActivityToolbarInterface {
 
-    public static final String EXTRA_PRIVATE_MESSAGE = "EPM";
+    public static final String EXTRA_PRIVATE_MESSAGE_INDEX = "EPM";
     public static final String EXTRA_MESSAGE_POSITION = "EMP";
     private static final String USER_AVATAR_STATE = "UAS";
+    private static final String PRIVATE_MESSAGES_STATE = "PMS";
     @BindView(R.id.linear_layout_view_private_messages_activity)
     LinearLayout mLinearLayout;
     @BindView(R.id.coordinator_layout_view_private_messages_activity)
@@ -111,15 +115,14 @@ public class ViewPrivateMessagesActivity extends BaseActivity implements Activit
 
         ButterKnife.bind(this);
 
+        EventBus.getDefault().register(this);
+
         applyCustomTheme();
 
         if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && isChangeStatusBarIconColor()) {
             addOnOffsetChangedListener(mAppBarLayout);
         }
 
-        Intent intent = getIntent();
-        privateMessage = intent.getParcelableExtra(EXTRA_PRIVATE_MESSAGE);
-
         setSupportActionBar(mToolbar);
         setToolbarGoToTop(mToolbar);
 
@@ -130,9 +133,16 @@ public class ViewPrivateMessagesActivity extends BaseActivity implements Activit
 
         if (savedInstanceState != null) {
             mUserAvatar = savedInstanceState.getString(USER_AVATAR_STATE);
-        }
+            privateMessage = savedInstanceState.getParcelable(PRIVATE_MESSAGES_STATE);
+            if (privateMessage == null) {
+                EventBus.getDefault().post(new PassPrivateMessageIndexEvent(getIntent().getIntExtra(EXTRA_PRIVATE_MESSAGE_INDEX, -1)));
+            } else {
                 bindView();
             }
+        } else {
+            EventBus.getDefault().post(new PassPrivateMessageIndexEvent(getIntent().getIntExtra(EXTRA_PRIVATE_MESSAGE_INDEX, -1)));
+        }
+    }
 
     private void bindView() {
         if (privateMessage != null) {
@@ -275,6 +285,13 @@ public class ViewPrivateMessagesActivity extends BaseActivity implements Activit
     protected void onSaveInstanceState(@NonNull Bundle outState) {
         super.onSaveInstanceState(outState);
         outState.putString(USER_AVATAR_STATE, mUserAvatar);
+        outState.putParcelable(PRIVATE_MESSAGES_STATE, privateMessage);
+    }
+
+    @Override
+    protected void onDestroy() {
+        super.onDestroy();
+        EventBus.getDefault().unregister(this);
     }
 
     @Override
@@ -310,6 +327,14 @@ public class ViewPrivateMessagesActivity extends BaseActivity implements Activit
         }
     }
 
+    @Subscribe
+    public void onPassPrivateMessageEvent(PassPrivateMessageEvent passPrivateMessageEvent) {
+        privateMessage = passPrivateMessageEvent.message;
+        if (privateMessage != null) {
+            bindView();
+        }
+    }
+
     public interface ProvideUserAvatarCallback {
         void fetchAvatarSuccess(String userAvatarUrl);
     }

app/src/main/java/ml/docilealligator/infinityforreddit/adapters/MessageRecyclerViewAdapter.java

@@ -55,7 +55,7 @@ public class MessageRecyclerViewAdapter extends PagedListAdapter<Message, Recycl
     private static final int VIEW_TYPE_DATA = 0;
     private static final int VIEW_TYPE_ERROR = 1;
     private static final int VIEW_TYPE_LOADING = 2;
-    private static final DiffUtil.ItemCallback<Message> DIFF_CALLBACK = new DiffUtil.ItemCallback<Message>() {
+    private static final DiffUtil.ItemCallback<Message> DIFF_CALLBACK = new DiffUtil.ItemCallback<>() {
         @Override
         public boolean areItemsTheSame(@NonNull Message message, @NonNull Message t1) {
             return message.getId().equals(t1.getId());
@@ -199,7 +199,7 @@ public class MessageRecyclerViewAdapter extends PagedListAdapter<Message, Recycl
                         mActivity.startActivity(intent);
                     } else if (mMessageType == FetchMessage.MESSAGE_TYPE_PRIVATE_MESSAGE) {
                         Intent intent = new Intent(mActivity, ViewPrivateMessagesActivity.class);
-                        intent.putExtra(ViewPrivateMessagesActivity.EXTRA_PRIVATE_MESSAGE, message);
+                        intent.putExtra(ViewPrivateMessagesActivity.EXTRA_PRIVATE_MESSAGE_INDEX, holder.getBindingAdapterPosition());
                         intent.putExtra(ViewPrivateMessagesActivity.EXTRA_MESSAGE_POSITION, holder.getBindingAdapterPosition());
                         mActivity.startActivity(intent);
                     }

app/src/main/java/ml/docilealligator/infinityforreddit/events/PassPrivateMessageEvent.java

@@ -0,0 +1,11 @@
+package ml.docilealligator.infinityforreddit.events;
+
+import ml.docilealligator.infinityforreddit.message.Message;
+
+public class PassPrivateMessageEvent {
+    public Message message;
+
+    public PassPrivateMessageEvent(Message message) {
+        this.message = message;
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/events/PassPrivateMessageIndexEvent.java

@@ -0,0 +1,9 @@
+package ml.docilealligator.infinityforreddit.events;
+
+public class PassPrivateMessageIndexEvent {
+    public int privateMessageIndex;
+
+    public PassPrivateMessageIndexEvent(int privateMessageIndex) {
+        this.privateMessageIndex = privateMessageIndex;
+    }
+}

app/src/main/java/ml/docilealligator/infinityforreddit/fragments/InboxFragment.java

@@ -13,6 +13,7 @@ import android.widget.TextView;
 import androidx.annotation.NonNull;
 import androidx.fragment.app.Fragment;
 import androidx.lifecycle.ViewModelProvider;
+import androidx.paging.PagedList;
 import androidx.recyclerview.widget.DividerItemDecoration;
 import androidx.recyclerview.widget.RecyclerView;
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
@@ -31,8 +32,8 @@ import butterknife.ButterKnife;
 import ml.docilealligator.infinityforreddit.FragmentCommunicator;
 import ml.docilealligator.infinityforreddit.Infinity;
 import ml.docilealligator.infinityforreddit.NetworkState;
-import ml.docilealligator.infinityforreddit.RecyclerViewContentScrollingInterface;
 import ml.docilealligator.infinityforreddit.R;
+import ml.docilealligator.infinityforreddit.RecyclerViewContentScrollingInterface;
 import ml.docilealligator.infinityforreddit.RedditDataRoomDatabase;
 import ml.docilealligator.infinityforreddit.activities.BaseActivity;
 import ml.docilealligator.infinityforreddit.adapters.MessageRecyclerViewAdapter;
@@ -40,6 +41,7 @@ import ml.docilealligator.infinityforreddit.customtheme.CustomThemeWrapper;
 import ml.docilealligator.infinityforreddit.customviews.LinearLayoutManagerBugFixed;
 import ml.docilealligator.infinityforreddit.events.RepliedToPrivateMessageEvent;
 import ml.docilealligator.infinityforreddit.message.FetchMessage;
+import ml.docilealligator.infinityforreddit.message.Message;
 import ml.docilealligator.infinityforreddit.message.MessageViewModel;
 import retrofit2.Retrofit;
 
@@ -214,6 +216,21 @@ public class InboxFragment extends Fragment implements FragmentCommunicator {
         mAdapter.setNetworkState(null);
     }
 
+    public Message getMessageByIndex(int index) {
+        if (mMessageViewModel == null || index < 0) {
+            return null;
+        }
+        PagedList<Message> messages = mMessageViewModel.getMessages().getValue();
+        if (messages == null) {
+            return null;
+        }
+        if (index >= messages.size()) {
+            return null;
+        }
+
+        return messages.get(index);
+    }
+
     @Override
     public void onDestroy() {
         super.onDestroy();