如何从通知中打开片段

Question

I'm writing a messaging app that makes use of fragments for various views. On the first fragment that is open, the user is presented with a list of contacts, and when he clicks on a contact, another fragment opens to show the existing chat window. This fragment is started with the following code:

FragmentManager fragmentManager = getFragmentManager();
msgChat msgChatFragment = new msgChat();
Bundle bundle = new Bundle(); 
bundle.putString("userSelected", manageContact.getName());
msgChatFragment.setArguments(bundle);
fragmentManager.beginTransaction().replace(R.id.content_frame, msgChatFragment).addToBackStack(null).commit();
getActivity().setTitle("Message Chat");

I also have a notification to inform the user of incoming messages. However, I'm having trouble launching the intended chat fragment when the user taps on the notification. My notification code is as follows:

Intent intent = new Intent(context, MainActivity.class);
String notificationMessage = "My notification message";
intent.setAction("Action1");
intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
intent.addCategory(Intent.CATEGORY_LAUNCHER);
PendingIntent pIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
NotificationCompat.Builder noti = new NotificationCompat.Builder(
  context).setContentTitle("My App")
  .setContentText(notificationMessage)
  .setSmallIcon(R.drawable.ic_stat_notify)
  .setContentIntent(pIntent).setAutoCancel(true)
  .setDefaults(Notification.DEFAULT_ALL);
notificationManager.notify(notifyId, noti.build());

In my MainActivity's onResume(), I have the following code to catch the intent:

Intent intent = getIntent();
try {
  String action = intent.getAction().toUpperCase();
}catch(Exception e){
  Log.e(TAG, "Problem consuming action from intent", e);              
}

However, getIntent() seems to always return a null value.

What am I doing wrong? Thanks!

Answer 1

I think this line is not correct:

intent.setAction("Action1");

You should use the following statement to indicate the willing of the intent (ie open an activity):

intent.setAction(Intent.ACTION_MAIN);
intent.addCategory(Intent.CATEGORY_LAUNCHER);

To identify the intent origin you can use putExtra function like that

intent.putExtra("origin", "incoming_message__open_chat")

Do not forget to enable receiving that in you activity:

<activity android:name="MainActivity">
    <!-- This activity is the main entry, should appear in app launcher -->
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

In your activity get the "origin"

protected void onCreate(Bundle savedInstanceState)
{
   ...
   String origin = savedInstanceState.getString("origin");
   ...
}

I have not the full solution but you should deep in this direction and read: http://developer.android.com/guide/components/intents-filters.html