Waiting for asynchronous callback in Android's IntentService

Question

I have an IntentService that starts an asynchronous task in another class and should then be waiting for the result.

The problem is that the IntentSer

Answer 1

If you are still looking for ways to use Intent Service for asynchronous callback, you can have a wait and notify on thread as follows,

private Object object = new Object();

@Override
protected void onHandleIntent(Intent intent) {
    // Make API which return async calback.

    // Acquire wait so that the intent service thread will wait for some one to release lock.
    synchronized (object) {
        try {
            object.wait(30000); // If you want a timed wait or else you can just use object.wait()
        } catch (InterruptedException e) {
            Log.e("Message", "Interrupted Exception while getting lock" + e.getMessage());
        }
    }
}

// Let say this is the callback being invoked
private class Callback {
    public void complete() {
        // Do whatever operation you want

        // Releases the lock so that intent service thread is unblocked.
        synchronized (object) {
            object.notifyAll();
        }   
    }
}