CODEWITHSUNDEEP
androidandroid-sensors
Stanislav Bondar
Stanislav Bondar

Reputation: 6265

Can't correctly release PowerManager.WakeLock

I'm using PowerManager.WakeLock for Sensor.TYPE_LIGHT in Activity. It works well but when i'm closing/went to other Activity SensorEventListener keep turn on/off screen if get sensor changes.

Code sample

    SensorManager mSensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    Sensor mLightSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_LIGHT);
    PowerManager mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
    PowerManager.WakeLock mWakeLock = mPowerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "tag");

SensorEventListener interface method

@Override
public void onSensorChanged(SensorEvent event) {
    float[] lux = event.values;

    if (lux[0] <= 200) {
        mWakeLock.acquire();
    } else {
        if (mWakeLock.isHeld()) {
            mWakeLock.release();
        }
    }
}

SensorManager listener 

 @Override
protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(this, mLightSensor, SensorManager.SENSOR_DELAY_FASTEST);

}

@Override
protected void onPause() {
    super.onPause();
    mSensorManager.unregisterListener(this, mLightSensor);

}

@Override
protected void onDestroy() {
    super.onDestroy();
    if (mWakeLock.isHeld()) {
        mWakeLock.release();
    }

}

So how to correctly release and disable WakeLock. Thanks in advance.

Upvotes: 0

Views: 397

Answers (1)

Stanislav Bondar
Stanislav Bondar

Reputation: 6265

My fault is using SensorEventListener. Probably it's dublicate WakeLock.acquire() and call this every time. The key is to acquire in onCreate() and release in onDestroy()

 @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
PowerManager mPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);
PowerManager.WakeLock mWakeLock = mPowerManager.newWakeLock(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, "tag");
mWakeLock.acquire();
}

@Override
protected void onDestroy() {
    if (mWakeLock.isHeld()) {
        mWakeLock.release();
    }
    super.onDestroy();
}

Upvotes: 1

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