为什么我的BroadcastReceiver会在一段时间后停止接收

Question

I have a IntentService that does a long work, it takes about 15 minutes to be done. It is a synchronization process to get new data from my server.

When this service starts, I start a activity too, to display the progess.

This activity creates a BroadcastReceiver , that intercepts messages sent from the service about the process progress.

If I leave the app doing it job, after a while the SO switch off the screen.

When I switch on the screen again, after about 15 minutes, the service has been already done, but the progress appears to be out of date. The BroadcastReceiver has stopped to work, and my END OF SYNCHRONIZATION message hasn't been received by the activity.

The problem is that, at this message I start the main activity again to leave the user to use the app again.

How can I solve this?

Answer 1

Broadcast Receivers are not made to do long duration work.

The lifetime of a broadcast receiver lasts about 10-15 seconds.

A recommended or typical use of a broadcast receiver is to

• Start a service
• Show a Toast
• Start an Activity

In your case you should start a service from your broadcast Receiver and do all the work in that service.

Answer 2

I solved with this http://developer.android.com/intl/pt-br/guide/components/services.html#Foreground .

My service

public class MyService extends Service {

    public interface MyCallback {
        void onProgress(int progress);
    }

    public class MyBinder {
        public MyService getService() {
            return MyService.this;
        }
    }

    public IBinder onBind(Intent intent) {
        return new MyBinder();
    }

    public void make(MyCallback callback) {

        Notification n = new Notification.Builder(this)
            .setContentTitle("Processing")
            .getNotification();

        startForeground(666 /*some ID*/, n);
        try {
            callback.onProgress(0);
            // do the hard sutff and report progress
            callback.onProgress(100); // report 100%
        } finally {
            stopForeground(true);
        }
    }
}

My activity

public MyActivity extends Activity implements ServiceConnection, MyService.MyCallback {

    @Override
    protected onStart() {
        super.onStart();
        // 1 - bind service to this activity
        Intent i = new Intent(this, MyService.class);
        this.bindService(i, this, BIND_AUTO_CREATE);
    }

    @Override
    public void onServiceConnected(ComponentName componentName, final IBinder iBinder) {
        // 2 - when the service was binded, starts the process asynchronous
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(Void... voids) {
                ((MyService.MyBinder) iBinder).getService().make(MyActivity.this);
                return null;
            }
        }.execute();
    }

    @Override
    public void onProgress(int progress) {
        // 3 - when to callback is fired, update the UI progress bar
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                // call ProgressBar.setProgress(progress);
            }
        });
    }

}