Fix threading issue

res/values/strings.xml

@@ -1558,7 +1558,7 @@
     <!-- New conversation activity -->
     <string name="activity_new_conversation_title">New Conversation</string>
     <string name="activity_new_conversation_public_key_edit_text_label">Public Key</string>
-    <string name="activity_new_conversation_public_key_explanation">Enter the public key of the person you\'d like to securely message. They can share their public key with you by going into Loki Messenger\'s in-app settings and clicking "Share Public Key".</string>
+    <string name="activity_new_conversation_public_key_explanation">Enter the public key of the person you\'d like to securely message. They can share their public key with you by going into Loki Messenger\'s in-app settings and clicking \"Share Public Key\".</string>
     <string name="activity_new_conversation_button_title">Next</string>
     <string name="activity_new_conversation_invalid_public_key_message">Invalid Public Key</string>
     <!-- Friend request view -->

src/org/thoughtcrime/securesms/jobs/PushDecryptJob.java

@@ -5,6 +5,8 @@ import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
 import android.os.Build;
+import android.os.Handler;
+import android.os.Looper;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.NotificationCompat;
@@ -911,14 +913,20 @@ public class PushDecryptJob extends BaseJob implements InjectableType {
   }
 
   private void sendBackgroundMessage(String contactHexEncodedPublicKey) {
-    SignalServiceMessageSender messageSender = ApplicationContext.getInstance(context).communicationModule.provideSignalMessageSender();
-    SignalServiceAddress address = new SignalServiceAddress(contactHexEncodedPublicKey);
-    SignalServiceDataMessage message = new SignalServiceDataMessage(System.currentTimeMillis(), "");
-    try {
-      messageSender.sendMessage(0, address, Optional.absent(), message); // The message ID doesn't matter
-    } catch (Exception e) {
-      Log.d("Loki", "Failed to send background message to: " + contactHexEncodedPublicKey + ".");
-    }
+    new Handler(Looper.getMainLooper()).post(new Runnable() {
+
+      @Override
+      public void run() {
+        SignalServiceMessageSender messageSender = ApplicationContext.getInstance(context).communicationModule.provideSignalMessageSender();
+        SignalServiceAddress address = new SignalServiceAddress(contactHexEncodedPublicKey);
+        SignalServiceDataMessage message = new SignalServiceDataMessage(System.currentTimeMillis(), "");
+        try {
+          messageSender.sendMessage(0, address, Optional.absent(), message); // The message ID doesn't matter
+        } catch (Exception e) {
+          Log.d("Loki", "Failed to send background message to: " + contactHexEncodedPublicKey + ".");
+        }
+      }
+    });
   }
 
   private long handleSynchronizeSentTextMessage(@NonNull SentTranscriptMessage message)