I am trying to develop a simple app which will record the user's activity (accelerometer values) on a txt or csv file.
My app consists of 2 java classes MainActivity and MyService. The MainActivity includes two buttons to start and stop the service and the required permissions. However, the onSensorChanged normally logs for the first 3 minutes after locking the phone (turning off the screen) and then stops logging. As soon as I open the screen the logd starts working again. Same behavior for the records in txt file. I found out that the app seems to be working excellent if I override the battery optimizations. However, I need the phone to also be working in doze mode to save some battery drain. Has anyone else had a similar issue?
Here is my Foreground Service:
public class MyService extends Service implements SensorEventListener {
public static final String CHANNEL_ID = "ForegroundServiceChannel";
private static final String TAG = "MyService";
private Messenger messageHandler;
private SensorManager mSensorManager;
private Sensor mAccelerometer;
private Context mContext;
private PowerManager.WakeLock wakeLock = null;
//private HandlerThread mSensorThread;
//private Handler mHandler;
@SuppressLint("MissingPermission")
@Override
public void onCreate() {
super.onCreate();
Log.v("shake service startup", "registering for shake");
mContext = getApplicationContext();
//mHandler = new Handler(mSensorThread.getLooper());
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = mSensorManager
.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mSensorManager.registerListener(this, mAccelerometer,
SensorManager.SENSOR_DELAY_NORMAL);
PowerManager manager = (PowerManager) getSystemService(Context.POWER_SERVICE);
wakeLock = manager.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "Wakelock :: TAG");
// Register our receiver for the ACTION_SCREEN_OFF action. This will make our receiver
// code be called whenever the phone enters standby mode.
//IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_OFF);
//registerReceiver(mReceiver, filter);
}
/*
// BroadcastReceiver for handling ACTION_SCREEN_OFF.
public BroadcastReceiver mReceiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
// Check action just to be on the safe side.
if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
Log.v("shake mediator screen off","trying re-registration");
// Unregisters the listener and registers it again.
mSensorManager.unregisterListener(MyService.this);
mSensorManager.registerListener(MyService.this, mAccelerometer,
SensorManager.SENSOR_DELAY_NORMAL, mHandler);
}
}
};
*/
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String input = intent.getStringExtra("inputExtra");
createNotificationChannel();
Intent notificationIntent = new Intent(this, MainActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(this,
0, notificationIntent, 0);
Notification notification = new NotificationCompat.Builder(this, CHANNEL_ID)
.setContentTitle("Foreground Service")
.setContentText(input)
.setSmallIcon(R.drawable.ic_launcher)
.setContentIntent(pendingIntent)
.build();
startForeground(1, notification);
return START_STICKY;
//stopSelf();
//return START_NOT_STICKY;
}
private void createNotificationChannel() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
NotificationChannel serviceChannel = new NotificationChannel(
CHANNEL_ID,
"Foreground Service Channel",
NotificationManager.IMPORTANCE_DEFAULT
);
NotificationManager manager = getSystemService(NotificationManager.class);
manager.createNotificationChannel(serviceChannel);
}
}
@Override
public void onDestroy() {
super.onDestroy();
if(mSensorManager != null){
//noinspection MissingPermission
mSensorManager.unregisterListener(MyService.this);
}
//unregisterReceiver(mReceiver);
try{
wakeLock.release();//always release before acquiring for safety just in case
}
catch(Exception e){
//probably already released
Log.e(TAG, e.getMessage());
}
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
@Override
public void onSensorChanged(SensorEvent event) {
Log.d(TAG, "onSensorChanged: " + event.timestamp + " " + event.values[0] + " " + event.values[1] + " " + event.values[2]);
recordAccelValues(String.valueOf(event.timestamp), event.values[0] + " " + event.values[1] + " " + event.values[2]);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
private void recordAccelValues(String time, String accel_values) {
String record = time + " " + accel_values + "\n";
String state = Environment.getExternalStorageState();
if (Environment.MEDIA_MOUNTED.equals(state)) {
if (Build.VERSION.SDK_INT >= 23) {
File sdcard = Environment.getExternalStorageDirectory();
File dir = new File(sdcard.getAbsolutePath() + "/text/");
if(!dir.exists()) {
dir.mkdir();
}
File file = new File(dir, "dailyRecordsAccel.dat");
FileOutputStream os = null;
try {
os = new FileOutputStream(file, true);
os.write(record.getBytes());
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
}
As you can see in the code I tried several recommendations from other questions I found, like wakelock and Intent.ACTION_SCREEN_OFF but they didn't seem to work. Accelerometer stops delivering samples when the screen is off on Droid/Nexus One even with a WakeLock
