implement "sending..." and resend feature.

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -6,6 +6,7 @@ import android.support.design.widget.FloatingActionButton;
 import android.support.v4.view.GravityCompat;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v4.widget.SlidingPaneLayout;
+import android.support.v7.app.AlertDialog;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
@@ -16,12 +17,14 @@ import chat.rocket.android.helper.LogcatIfError;
 import chat.rocket.android.helper.OnBackPressListener;
 import chat.rocket.android.layouthelper.chatroom.MessageComposerManager;
 import chat.rocket.android.layouthelper.chatroom.MessageListAdapter;
+import chat.rocket.android.layouthelper.chatroom.PairedMessage;
 import chat.rocket.android.model.ServerConfig;
 import chat.rocket.android.model.SyncState;
 import chat.rocket.android.model.ddp.Message;
 import chat.rocket.android.model.ddp.RoomSubscription;
 import chat.rocket.android.model.internal.LoadMessageProcedure;
 import chat.rocket.android.realm_helper.RealmHelper;
+import chat.rocket.android.realm_helper.RealmModelListAdapter;
 import chat.rocket.android.realm_helper.RealmObjectObserver;
 import chat.rocket.android.realm_helper.RealmStore;
 import chat.rocket.android.service.RocketChatService;
@@ -36,7 +39,8 @@ import timber.log.Timber;
 /**
  * Chat room screen.
  */
-public class RoomFragment extends AbstractChatRoomFragment implements OnBackPressListener {
+public class RoomFragment extends AbstractChatRoomFragment
+    implements OnBackPressListener, RealmModelListAdapter.OnItemClickListener<PairedMessage> {
 
   private String serverConfigId;
   private RealmHelper realmHelper;
@@ -93,12 +97,14 @@ public class RoomFragment extends AbstractChatRoomFragment implements OnBackPres
 
   @Override protected void onSetupView() {
     RecyclerView listView = (RecyclerView) rootView.findViewById(R.id.recyclerview);
-    listView.setAdapter(realmHelper.createListAdapter(getContext(),
+    MessageListAdapter adapter = (MessageListAdapter) realmHelper.createListAdapter(getContext(),
         realm -> realm.where(Message.class)
             .equalTo("rid", roomId)
             .findAllSorted("ts", Sort.DESCENDING),
         context -> new MessageListAdapter(context, hostname)
-    ));
+    );
+    listView.setAdapter(adapter);
+    adapter.setOnItemClickListener(this);
 
     LinearLayoutManager layoutManager = new LinearLayoutManager(getContext(),
         LinearLayoutManager.VERTICAL, true);
@@ -115,6 +121,32 @@ public class RoomFragment extends AbstractChatRoomFragment implements OnBackPres
     setupMessageComposer();
   }
 
+  @Override public void onItemClick(PairedMessage pairedMessage) {
+    if (pairedMessage.target != null) {
+      final int syncstate = pairedMessage.target.getSyncstate();
+      if (syncstate == SyncState.FAILED) {
+        final String messageId = pairedMessage.target.get_id();
+        new AlertDialog.Builder(getContext())
+            .setPositiveButton(R.string.resend, (dialog, which) -> {
+              realmHelper.executeTransaction(realm ->
+                  realm.createOrUpdateObjectFromJson(Message.class, new JSONObject()
+                      .put("_id", messageId)
+                      .put("syncstate", SyncState.NOT_SYNCED))
+              ).continueWith(new LogcatIfError());
+            })
+            .setNegativeButton(android.R.string.cancel, null)
+            .setNeutralButton(R.string.discard, (dialog, which) -> {
+              realmHelper.executeTransaction(realm ->
+                  realm.where(Message.class)
+                      .equalTo("_id", messageId).findAll().deleteAllFromRealm()
+              ).continueWith(new LogcatIfError());;
+            })
+            .show();
+      }
+    }
+
+  }
+
   private void setupSideMenu() {
     View sidemenu = rootView.findViewById(R.id.room_side_menu);
     sidemenu.findViewById(R.id.btn_users).setOnClickListener(view -> {

app/src/main/java/chat/rocket/android/layouthelper/chatroom/MessageViewHolder.java

@@ -7,6 +7,7 @@ import android.widget.TextView;
 import chat.rocket.android.R;
 import chat.rocket.android.helper.DateTime;
 import chat.rocket.android.helper.TextUtils;
+import chat.rocket.android.model.SyncState;
 import chat.rocket.android.realm_helper.RealmModelViewHolder;
 import chat.rocket.android.renderer.MessageRenderer;
 import chat.rocket.android.widget.message.RocketChatMessageLayout;
@@ -49,6 +50,15 @@ public class MessageViewHolder extends RealmModelViewHolder<PairedMessage> {
         .timestampInto(timestamp)
         .bodyInto(body);
 
+    if (pairedMessage.target != null) {
+      int syncstate = pairedMessage.target.getSyncstate();
+      if (syncstate == SyncState.NOT_SYNCED || syncstate == SyncState.SYNCING) {
+        itemView.setAlpha(0.6f);
+      } else {
+        itemView.setAlpha(1.0f);
+      }
+    }
+
     renderNewDayAndSequential(pairedMessage);
   }
 

app/src/main/java/chat/rocket/android/layouthelper/chatroom/PairedMessage.java

@@ -7,7 +7,7 @@ import chat.rocket.android.model.ddp.Message;
  * View Model for messages in chatroom.
  */
 public class PairedMessage {
-  final Message target;
+  public final Message target;
   final Message nextSibling;
 
   public PairedMessage(Message target, Message nextSibling) {

app/src/main/java/chat/rocket/android/renderer/MessageRenderer.java

@@ -3,7 +3,9 @@ package chat.rocket.android.renderer;
 import android.content.Context;
 import android.widget.ImageView;
 import android.widget.TextView;
+import chat.rocket.android.R;
 import chat.rocket.android.helper.DateTime;
+import chat.rocket.android.model.SyncState;
 import chat.rocket.android.model.ddp.Message;
 import chat.rocket.android.widget.message.RocketChatMessageLayout;
 
@@ -23,7 +25,14 @@ public class MessageRenderer extends AbstractRenderer<Message> {
    * show Avatar image.
    */
   public MessageRenderer avatarInto(ImageView imageView, String hostname) {
-    userRenderer.avatarInto(imageView, hostname);
+    switch (object.getSyncstate()) {
+      case SyncState.FAILED:
+        imageView.setImageResource(R.drawable.ic_error_outline_black_24dp);
+        break;
+      default:
+        userRenderer.avatarInto(imageView, hostname);
+        break;
+    }
     return this;
   }
 
@@ -43,7 +52,15 @@ public class MessageRenderer extends AbstractRenderer<Message> {
       return this;
     }
 
-    textView.setText(DateTime.fromEpocMs(object.getTs(), DateTime.Format.TIME));
+    switch (object.getSyncstate()) {
+      case SyncState.NOT_SYNCED:
+      case SyncState.SYNCING:
+        textView.setText(R.string.sending);
+        break;
+      default:
+        textView.setText(DateTime.fromEpocMs(object.getTs(), DateTime.Format.TIME));
+        break;
+    }
 
     return this;
   }

app/src/main/res/drawable/ic_error_outline_black_24dp.xml

+<vector android:alpha="0.78" android:height="24dp"
+    android:viewportHeight="24.0" android:viewportWidth="24.0"
+    android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
+    <path android:fillColor="#FF000000" android:pathData="M11,15h2v2h-2zM11,7h2v6h-2zM11.99,2C6.47,2 2,6.48 2,12s4.47,10 9.99,10C17.52,22 22,17.52 22,12S17.52,2 11.99,2zM12,20c-4.42,0 -8,-3.58 -8,-8s3.58,-8 8,-8 8,3.58 8,8 -3.58,8 -8,8z"/>
+</vector>

app/src/main/res/values/strings.xml

@@ -11,4 +11,7 @@
   <string name="start_of_conversation">Start of conversation</string>
   <string name="users_of_room_title">Members List</string>
   <string name="fmt_room_user_count">Total: %,d users</string>
+  <string name="sending">Sending...</string>
+  <string name="resend">Resend</string>
+  <string name="discard">Discard</string>
 </resources>