[英]How to unregister a listener from a sensor after stopping the service?
我正在创建一个应用程序,它在按下“开始”按钮时启动服务并在按下“停止”按钮时停止它。 在该服务中,我为传感器 ACCELEROMETER 注册了一个侦听器,以便获得 x、y、z 轴的加速度计值。
这是代码:
// Service
public class Accel extends Service
{
private static Context CONTEXT;
private static Sensor sensor;
private static SensorManager sensorManager;
private static boolean running = false;
@Override
public void onCreate()
{
}
// code to execute when the service is shutting down
@Override
public void onDestroy()
{
if (isListening())
stopListening();
}
// code to execute when the service is starting up
@Override
public void onStart(Intent intent, int startid)
{
CONTEXT = this;
startListening(this);
}
public static Context getContext()
{
return CONTEXT;
}
// Returns true if the manager is listening to orientation changes
public static boolean isListening()
{
return running;
}
//Unregisters listeners
public static void stopListening()
{
running = false;
sensorManager.unregisterListener(sensorEventListener, sensor);
}
/**
* Registers a listener and start listening
* @param accelerometerListener
* callback for accelerometer events
*/
public static void startListening(AccelerometerListener accelerometerListener)
{
sensorManager = (SensorManager) getContext().getSystemService(Context.SENSOR_SERVICE);
List<Sensor> sensors = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
if (sensors.size() > 0)
{
sensor = sensors.get(0);
running = sensorManager.registerListener(sensorEventListener, sensor, SensorManager.SENSOR_DELAY_GAME);
listener = accelerometerListener;
}
}
/**
* The listener that listen to events from the accelerometer listener
*/
private static SensorEventListener sensorEventListener =
new SensorEventListener()
{
public void onAccuracyChanged(Sensor sensor, int accuracy) {}
public void onSensorChanged(SensorEvent event)
{
// the code to perform on sensor change
}
};
}
有人可以帮我吗??
onDestroy()
可能不会立即被您的应用程序上的操作系统调用。 将stopListening()
调用放入onPause()
,并将startListening()
放入onResume()
函数中。 这样你就可以保证应用程序在传感器上注册和取消注册。
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