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POAndroid AlarmManager for periodical sensor reading
 

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    <p>I have a task to periodically read the phone sensors (e.g. WiFi, accelerometer) in the backend.</p> <p>My current solution is to use an AlarmManager.</p> <p>Specifically, we have:</p> <p>In the "main" program (an activity), we use PendingIntent.getService:</p> <pre> public class Main extends Activity { ... Intent intent = new Intent(this, AutoLogging.class); mAlarmSender = PendingIntent.getService(this, 0, intent, 0); am = (AlarmManager)getSystemService(ALARM_SERVICE); am.setRepeating(AlarmManager.RTC, 0, 5*1000, mAlarmSender); } </pre> <p>In the "AutoLogging" program (a service), we respond to the alarm periodically:</p> <pre> public class AutoLogging extends Service { ... @Override public void onCreate() { Toast.makeText(this, "onCreate", Toast.LENGTH_SHORT).show(); } @Override public void onDestroy() { super.onDestroy(); Toast.makeText(this, "onDestroy", Toast.LENGTH_SHORT).show(); } @Override public boolean onUnbind(Intent intent) { Toast.makeText(this, "onUnbind", Toast.LENGTH_SHORT).show() return super.onUnbind(intent); } @Override public void onStart(Intent intent, int startId) { super.onStart(intent, startId); Toast.makeText(this, "onStart", Toast.LENGTH_SHORT).show(); // Read sensor data here } @Override public IBinder onBind(Intent intent) { Toast.makeText(this, "onBind", Toast.LENGTH_SHORT).show(); return null; } } </pre> <p>My problem is:</p> <p>When I use this alarm service, only OnCreate and OnStart are called at each alarm. </p> <p>My questions are:</p> <p>(1) Do we need to call OnDestroy (or onBind, onUnbind)?</p> <p>(2) Is this a correct way to use AlarmManager (compared with "broadcase receiver")? </p> <p>Thanks! Vincent</p>
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