putExtra覆盖extractResult的值

Question

I am experiencing a problem with using intent.putExtra to supply a ResultReceiver from one service to another service. Without using putExtra my intent handler gives me periodic results, but when it is included it cannot find anything but the value it added.

Without the putExtra the mExtras->mMap->table has as [0] com.google.android.location.internal.EXTRA_RELEASE_VERSION and as [2] com.google.android.location.internal.EXTRA_ACTIVITY_RESULT out of 3 entries. When I include the putExtra in my code, the only entry in my mExtras->mMap->table is [2] the RESULT_RECEIVER .

IntentService handler

protected void onHandleIntent(Intent intent) {         
  if (ActivityRecognitionResult.hasResult(intent)) {
    ActivityRecognitionResult result = ActivityRecognitionResult.extractResult(intent);
    DetectedActivity activity = result.getMostProbableActivity();
    ResultReceiver receiver = intent.getParcelableExtra(ActivityRecognitionService.RESULT_RECEIVER);             
    Bundle bundle = new Bundle();
    bundle.putParcelable("activity", activity);
    receiver.send(CODE, bundle);*/
  }  
}

ActivityRecognitionService.ACTIVITY = activity; is how I am currently getting the data across. It is one of the possibilities for data transfer mentioned on the Android developer pages, but I feel it's neater to do it using a ResultReceiver or other callback system.

Class owning the intent, ActivityRecognitionService

(which also happens to be a Service bound to an activity, for reference)

Note that creation and connection of activityClient is done in onCreate()

static final String RESULT_RECEIVER = "com.example.myApp.RESULT_RECEIVER";  

void onConnected(Bundle connectionHint) {
  Intent intent = new Intent(ActivityRecognitionService.this, ActivityRecognitionIntentService.class);
  intent.putExtra(ActivityRecognitionService.RESULT_RECEIVER, resultReceiver);
  PendingIntent callbackIntent = PendingIntent.getService(this, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT);
  activityClient.requestActivityUpdates(DETECTION_INTERVAL, callbackIntent);
}

I don't get any errors, it simply fails to find any result in hasResult(intent) when putExtra is included.

Answer 1

I've been struggling with this also. I believe its because the pendingIntent passed into requestActivityUpdates() has the FLAG_UPDATE_CURRENT set (which from my understanding overwrites the extras in the intent - giving you back what you pass in it this case).

I got around this by passing the DetectedActivity (as it implements parcelable) back to my calling service in a startService Intent and process it in onStartCommand.

ActivityRecognition IntentService:

@Override
protected void onHandleIntent(Intent intent) {
        if (ActivityRecognitionResult.hasResult(intent)) {

         ActivityRecognitionResult result = ActivityRecognitionResult.extractResult(intent);

         DetectedActivity detected = result.getMostProbableActivity();

         Intent intent= new Intent(this, CallingService.class);
         intent.putExtra(CallingService.EXTRA_ACTIVITY, detected);

         startService(intent);
     }
}

Calling Service:

public int onStartCommand(Intent intent, int flags, int startId) {  

    if(intent.hasExtra(CallingService.EXTRA_ACTIVITY)){

        DetectedActivity result = intent.getParcelableExtra(CallingService.EXTRA_ACTIVITY);
            // REST OF PROCESSING
    }

    return START_STICKY;
}

Hope this helps or someone else can chip in with an alternative.

Answer 2

I was stuck on this as well, but finally found a suitable solution.

In the end, I created a new BroadcastIntent from within the ActivityRecognitionService, and registered a BroadcastReceiver in my manifest.

    if (ActivityRecognitionResult.hasResult(intent)) 
    {
        ActivityRecognitionResult result = ActivityRecognitionResult.extractResult(intent);
        String myActivity = getFriendlyName(result.getMostProbableActivity().getType());

        if(Globals.SHOW_LOG)
        {
            Log.d(TAG, "ActivityRecognitionResult: " + myActivity);
            Log.d(TAG, result.toString());
        }
        // YOUR CODE GOES HERE!
        // Store the current activity in SharedPreferences or whatever

        // Broadcast the event to the receiver
        Intent broadcastIntent = new Intent(this, ReceiverActivityRecognition.class);
        broadcastIntent.addCategory(Intent.CATEGORY_DEFAULT);
        broadcastIntent.putExtra(Globals.ARG_RECEIVER_EXTRA, myActivity);
        sendBroadcast(broadcastIntent);
    }

In the manifest you need to register the BroadcastReceiver:

    <receiver android:name=".ReceiverActivityRecognition"/>

Hope this helps someone!