fragment voodoo

src/main/java/eu/siacs/conversations/ui/ConversationFragment.java

@@ -7,6 +7,7 @@ import android.content.pm.PackageManager;
 import android.databinding.DataBindingUtil;
 import android.net.Uri;
 import android.os.Build;
+import android.os.Parcelable;
 import android.preference.Preference;
 import android.preference.PreferenceManager;
 import android.provider.MediaStore;
@@ -62,6 +63,7 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.UUID;
 import java.util.concurrent.atomic.AtomicBoolean;
@@ -92,6 +94,7 @@ import eu.siacs.conversations.ui.adapter.MessageAdapter;
 import eu.siacs.conversations.ui.util.ActivityResult;
 import eu.siacs.conversations.ui.util.AttachmentTool;
 import eu.siacs.conversations.ui.util.ConversationMenuConfigurator;
+import eu.siacs.conversations.ui.util.PendingItem;
 import eu.siacs.conversations.ui.util.PresenceSelector;
 import eu.siacs.conversations.ui.util.SendButtonAction;
 import eu.siacs.conversations.ui.util.SendButtonTool;
@@ -129,19 +132,18 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 	public static final int ATTACHMENT_CHOICE_RECORD_VIDEO = 0x0307;
 
 	public static final String RECENTLY_USED_QUICK_ACTION = "recently_used_quick_action";
+	public static final String STATE_CONVERSATION_UUID = ConversationFragment.class.getName() + ".uuid";
+	public static final String STATE_SCROLL_POSITION = ConversationFragment.class.getName() + ".scroll_position";
 
 
 	final protected List<Message> messageList = new ArrayList<>();
-	protected Conversation conversation;
+	private final PendingItem<ActivityResult> postponedActivityResult = new PendingItem<>();
-
+	private final PendingItem<String> pendingConversationsUuid = new PendingItem<>();
-	private FragmentConversationBinding binding;
-
-	protected MessageAdapter messageListAdapter;
-	private Toast messageLoaderToast;
-
-	private ActivityResult postponedActivityResult = null;
 	public Uri mPendingEditorContent = null;
-
+	protected MessageAdapter messageListAdapter;
+	private Conversation conversation;
+	private FragmentConversationBinding binding;
+	private Toast messageLoaderToast;
 	private ConversationsMainActivity activity;
 
 	private OnClickListener clickToMuc = new OnClickListener() {
@@ -717,7 +719,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 		if (activity != null && activity.xmppConnectionService != null) {
 			handleActivityResult(activityResult);
 		} else {
-			this.postponedActivityResult = activityResult;
+			this.postponedActivityResult.push(activityResult);
 		}
 	}
 
@@ -726,14 +728,14 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 	}
 
 	@Override
-	public void onAttach(Context context) {
+	public void onAttach(Activity activity) {
+		super.onAttach(activity);
 		Log.d(Config.LOGTAG, "onAttach()");
-		if (context instanceof ConversationsMainActivity) {
+		if (activity instanceof ConversationsMainActivity) {
-			this.activity = (ConversationsMainActivity) context;
+			this.activity = (ConversationsMainActivity) activity;
 		} else {
 			throw new IllegalStateException("Trying to attach fragment to activity that is not the ConversationActivity");
 		}
-		super.onAttach(context);
 	}
 
 	@Override
@@ -1530,6 +1532,27 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 		}
 	}
 
+
+	@Override
+	public void onSaveInstanceState(Bundle outState) {
+		super.onSaveInstanceState(outState);
+		if (conversation != null) {
+			outState.putString(STATE_CONVERSATION_UUID, conversation.getUuid());
+		}
+	}
+
+	@Override
+	public void onActivityCreated(Bundle savedInstanceState) {
+		super.onActivityCreated(savedInstanceState);
+		if (savedInstanceState == null) {
+			return;
+		}
+		String uuid = savedInstanceState.getString(STATE_CONVERSATION_UUID);
+		if (uuid != null) {
+			this.pendingConversationsUuid.push(uuid);
+		}
+	}
+
 	@Override
 	public void onStart() {
 		super.onStart();
@@ -1563,6 +1586,7 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 	public boolean reInit(Conversation conversation) {
 		Log.d(Config.LOGTAG, "reInit()");
 		if (conversation == null) {
+			Log.d(Config.LOGTAG, "conversation was null :(");
 			return false;
 		}
 
@@ -2159,16 +2183,35 @@ public class ConversationFragment extends XmppFragment implements EditMessage.Ke
 
 	@Override
 	public void onBackendConnected() {
-		if (postponedActivityResult != null) {
+		Log.d(Config.LOGTAG, "ConversationFragment.onBackendConnected()");
-			handleActivityResult(postponedActivityResult);
+		String uuid = pendingConversationsUuid.pop();
+		if (uuid != null) {
+			Conversation conversation = activity.xmppConnectionService.findConversationByUuid(uuid);
+			if (conversation == null) {
+				Log.d(Config.LOGTAG, "unable to restore activity");
+				clearPending();
+				return;
 			}
-		postponedActivityResult = null;
+			reInit(conversation);
+		}
+		ActivityResult activityResult = postponedActivityResult.pop();
+		if (activityResult != null) {
+			handleActivityResult(activityResult);
+		}
+	}
+
+	@Override
+	void refresh() {
+
 	}
 
 	public void clearPending() {
-		if (postponedActivityResult != null) {
+		if (postponedActivityResult.pop() != null) {
 			Log.d(Config.LOGTAG, "cleared pending intent with unhandled result left");
 		}
-		postponedActivityResult = null;
+	}
+
+	public Conversation getConversation() {
+		return conversation;
 	}
 }

src/main/java/eu/siacs/conversations/ui/ConversationsMainActivity.java

@@ -31,11 +31,15 @@ package eu.siacs.conversations.ui;
 
 
 import android.app.Fragment;
+import android.app.FragmentManager;
 import android.app.FragmentTransaction;
 import android.databinding.DataBindingUtil;
 import android.os.Bundle;
 import android.support.annotation.IdRes;
+import android.support.v7.app.ActionBar;
 import android.util.Log;
+import android.view.Menu;
+import android.view.MenuItem;
 
 import eu.siacs.conversations.Config;
 import eu.siacs.conversations.R;
@@ -60,6 +64,7 @@ public class ConversationsMainActivity extends XmppActivity implements OnConvers
 	void onBackendConnected() {
 		notifyFragment(R.id.main_fragment);
 		notifyFragment(R.id.secondary_fragment);
+		invalidateActionBarTitle();
 	}
 
 	private void notifyFragment(@IdRes int id) {
@@ -74,7 +79,15 @@ public class ConversationsMainActivity extends XmppActivity implements OnConvers
 		super.onCreate(savedInstanceState);
 		new EmojiService(this).init();
 		this.binding = DataBindingUtil.setContentView(this, R.layout.activity_conversations);
+		this.getFragmentManager().addOnBackStackChangedListener(this::invalidateActionBarTitle);
 		this.initializeFragments();
+		this.invalidateActionBarTitle();
+	}
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		getMenuInflater().inflate(R.menu.activity_conversations, menu);
+		return super.onCreateOptionsMenu(menu);
 	}
 
 	@Override
@@ -85,20 +98,84 @@ public class ConversationsMainActivity extends XmppActivity implements OnConvers
 			conversationFragment = new ConversationFragment();
 			FragmentTransaction fragmentTransaction = getFragmentManager().beginTransaction();
 			fragmentTransaction.replace(R.id.main_fragment, conversationFragment);
+			fragmentTransaction.addToBackStack(null);
 			fragmentTransaction.commit();
 		}
 		conversationFragment.reInit(conversation);
 	}
 
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		switch (item.getItemId()) {
+			case android.R.id.home:
+				FragmentManager fm = getFragmentManager();
+				if (fm.getBackStackEntryCount() > 0) {
+					fm.popBackStack();
+					return true;
+				}
+				break;
+		}
+		return super.onOptionsItemSelected(item);
+	}
+
 	private void initializeFragments() {
 		FragmentTransaction transaction = getFragmentManager().beginTransaction();
+		Fragment mainFragment = getFragmentManager().findFragmentById(R.id.main_fragment);
+		Fragment secondaryFragment = getFragmentManager().findFragmentById(R.id.secondary_fragment);
+		if (mainFragment != null) {
+			Log.d(Config.LOGTAG,"initializeFragment(). main fragment exists");
+			if (binding.secondaryFragment != null) {
+				if (mainFragment instanceof ConversationFragment) {
+					Log.d(Config.LOGTAG,"gained secondary fragment. moving...");
+					getFragmentManager().popBackStack();
+					transaction.remove(mainFragment);
+					transaction.commit();
+					getFragmentManager().executePendingTransactions();
+					transaction = getFragmentManager().beginTransaction();
+					transaction.replace(R.id.secondary_fragment, mainFragment);
 					transaction.replace(R.id.main_fragment, new ConversationsOverviewFragment());
+					transaction.commit();
+					return;
+				}
+			} else {
+				if (secondaryFragment != null && secondaryFragment instanceof ConversationFragment) {
+					Log.d(Config.LOGTAG,"lost secondary fragment. moving...");
+					transaction.remove(secondaryFragment);
+					transaction.commit();
+					getFragmentManager().executePendingTransactions();
+					transaction = getFragmentManager().beginTransaction();
+					transaction.replace(R.id.main_fragment, secondaryFragment);
+					transaction.addToBackStack(null);
+					transaction.commit();
+					return;
+				}
+			}
+		} else {
+			transaction.replace(R.id.main_fragment, new ConversationsOverviewFragment());
+		}
 		if (binding.secondaryFragment != null) {
 			transaction.replace(R.id.secondary_fragment, new ConversationFragment());
 		}
 		transaction.commit();
 	}
 
+	private void invalidateActionBarTitle() {
+		final ActionBar actionBar = getSupportActionBar();
+		if (actionBar != null) {
+			Fragment mainFragment = getFragmentManager().findFragmentById(R.id.main_fragment);
+			if (mainFragment != null && mainFragment instanceof ConversationFragment) {
+				final Conversation conversation = ((ConversationFragment) mainFragment).getConversation();
+				if (conversation != null) {
+					actionBar.setTitle(conversation.getName());
+					actionBar.setDisplayHomeAsUpEnabled(true);
+					return;
+				}
+			}
+			actionBar.setTitle(R.string.app_name);
+			actionBar.setDisplayHomeAsUpEnabled(false);
+		}
+	}
+
 	@Override
 	public void onConversationArchived(Conversation conversation) {
 

src/main/java/eu/siacs/conversations/ui/ConversationsOverviewFragment.java

@@ -29,6 +29,7 @@
 
 package eu.siacs.conversations.ui;
 
+import android.app.Activity;
 import android.content.Context;
 import android.databinding.DataBindingUtil;
 import android.os.Bundle;
@@ -36,7 +37,6 @@ import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.AdapterView;
 
 import java.util.ArrayList;
 import java.util.List;
@@ -55,20 +55,22 @@ public class ConversationsOverviewFragment extends XmppFragment {
 
 	private final List<Conversation> conversations = new ArrayList<>();
 	private ConversationAdapter conversationsAdapter;
-	private ConversationsMainActivity activity;
+	private XmppActivity activity;
 
 	@Override
-	public void onAttach(Context context) {
+	public void onAttach(Activity activity) {
-		if (context instanceof ConversationsMainActivity) {
+		super.onAttach(activity);
-			this.activity = (ConversationsMainActivity) context;
+		Log.d(Config.LOGTAG,"on attach");
+		if (activity instanceof XmppActivity) {
+			this.activity = (XmppActivity) activity;
 		} else {
-			throw new IllegalStateException("Trying to attach fragment to activity that is not the ConversationActivity");
+			throw new IllegalStateException("Trying to attach fragment to activity that is not an XmppActivity");
 		}
-		super.onAttach(context);
 	}
 
 	@Override
 	public View onCreateView(final LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+		Log.d(Config.LOGTAG,"onCreateView");
 		this.binding = DataBindingUtil.inflate(inflater, R.layout.fragment_conversations_overview, container, false);
 		this.binding.fab.setOnClickListener((view)-> StartConversationActivity.launch(getActivity()));
 
@@ -90,6 +92,26 @@ public class ConversationsOverviewFragment extends XmppFragment {
 	@Override
 	void onBackendConnected() {
 		Log.d(Config.LOGTAG,"nice!");
+		refresh();
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		Log.d(Config.LOGTAG,"ConversationsOverviewFragment.onStart()");
+		if (activity.xmppConnectionService != null) {
+			refresh();
+		}
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		Log.d(Config.LOGTAG,"ConversationsOverviewFragment.onResume()");
+	}
+
+	@Override
+	void refresh() {
 		this.activity.xmppConnectionService.populateWithOrderedConversations(this.conversations);
 		this.conversationsAdapter.notifyDataSetChanged();
 	}

src/main/java/eu/siacs/conversations/ui/XmppFragment.java

@@ -34,4 +34,6 @@ import android.app.Fragment;
 public abstract class XmppFragment extends Fragment {
 
 	abstract void onBackendConnected();
+
+	abstract void refresh();
 }

src/main/java/eu/siacs/conversations/ui/util/PendingItem.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright (c) 2018, Daniel Gultsch All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification,
+ * are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation and/or
+ * other materials provided with the distribution.
+ *
+ * 3. Neither the name of the copyright holder nor the names of its contributors
+ * may be used to endorse or promote products derived from this software without
+ * specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package eu.siacs.conversations.ui.util;
+
+public class PendingItem<T> {
+
+	private T item = null;
+
+	public synchronized void push(T item) {
+		this.item = item;
+	}
+
+	public synchronized T pop() {
+		final T item = this.item;
+		this.item = null;
+		return item;
+	}
+}

src/main/res/menu/activity_conversations.xml

@@ -1,22 +1,14 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
-
-    <item
-        android:id="@+id/action_add"
-        android:icon="?attr/icon_new"
-        android:orderInCategory="10"
-        app:showAsAction="always"
-        android:title="@string/action_add"/>
-
     <item
         android:id="@+id/action_accounts"
         android:orderInCategory="90"
-        app:showAsAction="never"
+        android:title="@string/action_accounts"
-        android:title="@string/action_accounts"/>
+        app:showAsAction="never"/>
     <item
         android:id="@+id/action_settings"
         android:orderInCategory="100"
-        app:showAsAction="never"
+        android:title="@string/action_settings"
-        android:title="@string/action_settings"/>
+        app:showAsAction="never"/>
 
 </menu>