无法正确释放 PowerManager.WakeLock

Question

我在 Activity 中将 PowerManager.WakeLock 用于 Sensor.TYPE_LIGHT。它运行良好，但是当我 closing/went 到其他 Activity SensorEventListener 时，如果传感器发生变化，请继续转动 on/off 屏幕。

代码示例

    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接口方法

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

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

SensorManager听众

 @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();
    }

}

那么如何正确释放和禁用WakeLock。提前致谢。

Answer 1

我的错误是使用 SensorEventListener。可能它是重复的 WakeLock.acquire() 并且每次都调用它。关键是在onCreate()获取，在onDestroy()

释放

 @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();
}

无法正确释放 PowerManager.WakeLock

Can't correctly release PowerManager.WakeLock

android

android-sensors