Android: IntentService: How to call a IntentService from an Activity?

Question

I would like to pass an IntentService callback. Here are my current codes:

My callback interface

import android.os.Message; public interface SampleCallback { public void doSomethingFromCurrentThread(); public void doSomethingFromUIThread(final Message msg); } 

My IntentService

 import android.app.IntentService; import android.content.Intent; import android.os.Handler; import android.os.Message; import android.util.Log; public class SampleCallbackIntentService extends IntentService { private final String LOG_LOGCAT_TAG = "SampleCallbackIntentService"; private final SampleCallback _callback; private Handler _handler; public SampleCallbackIntentService(String name, SampleCallback callback) { super(name); _callback = callback; } @Override public void onCreate() { super.onCreate(); // initialize variables for pause & resume thread _mPauseLock = new Object(); _mPaused = false; _mFinished = false; // initialize handler to switch to UI/Main thread _handler = new Handler() { @Override public void handleMessage(final Message msg) { _callback.doSomethingFromUIThread(msg); } }; } private final int CALLBACK_MESSAGE = 1; @Override protected void onHandleIntent(Intent arg0) { Log.i(LOG_LOGCAT_TAG, "loop started"); while (!_mFinished) { // do stuff here _callback.doSomethingFromCurrentThread(); // process and create the result to pass String someResult = "some result here"; _handler.sendMessage(_handler.obtainMessage(CALLBACK_MESSAGE, someResult)); synchronized (_mPauseLock) { while (_mPaused) { try { Log.i(LOG_LOGCAT_TAG, "loop paused"); _mPauseLock.wait(); Log.i(LOG_LOGCAT_TAG, "loop resumed"); } catch (InterruptedException e) { Log.e(LOG_LOGCAT_TAG, "error occured on pause", e); } } } try { Thread.sleep(1000); } catch (InterruptedException e) { Log.e(LOG_LOGCAT_TAG, "error occured on sleep", e); } } Log.i(LOG_LOGCAT_TAG, "loop ended"); } private Object _mPauseLock; private boolean _mPaused; private boolean _mFinished; /** * Call this on pause. */ public void pause() { Log.i(LOG_LOGCAT_TAG, "pause() called"); synchronized (_mPauseLock) { _mPaused = true; } } /** * Call this on resume. */ public void resume() { Log.i(LOG_LOGCAT_TAG, "resume() called"); synchronized (_mPauseLock) { _mPaused = false; _mPauseLock.notifyAll(); } } } 

Any guidance on how to pass my callback is welcome.

Answer 1

You may be looking for a ResultReceiver . It implements Parcelable so you can pass intentions to its service.

I apologize for the answer 4 years later.

Answer 2

Here is a good response about activity notification from the service: Notify activity from the service . For me, Activity.createPendingResult() is a great way to trigger parent activity.

This is actually not a callback, but AFAIK is not a good way to implement such a callback without an associated service.