java - 如何在 Android 中将后台服务注册为 SensorEventListener

Question

我正在尝试提供一个后台服务来读取手机的方位角、俯仰角和横滚角，并通过网络发送它们。我已经创建了一个 IntentService 和计算代码来计算方向，但是我不太确定如何将后台服务注册为事件监听器。

public class SocketService extends IntentService implements SensorEventListener {
Socket my_socket;
PrintWriter out;
float[] mGravity;
float[] mGeomagnetic;
float azimuth,pitch,roll;

public void onAccuracyChanged(Sensor s, int accuracy){

}
public void onSensorChanged(SensorEvent event){
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER)
        mGravity = event.values;
    if (event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD)
        mGeomagnetic = event.values;
    if (mGravity != null && mGeomagnetic != null) {
        float R[] = new float[9];
        float I[] = new float[9];
        boolean success = SensorManager.getRotationMatrix(R, I, mGravity, mGeomagnetic);
        if (success) {
            float orientationData[] = new float[3];
            SensorManager.getOrientation(R, orientationData);
            azimuth = orientationData[0];
            pitch = orientationData[1];
            roll = orientationData[2];
            out.print("Hello");
            out.flush();

        }
    }
}
public SocketService(){
    super("Socket Service");
}


protected void onHandleIntent(Intent workIntent) {
    try {
        my_socket = new Socket(ip, 5000);
        out = new PrintWriter(my_socket.getOutputStream());
    }catch(Exception e){
        Log.v("ERROR",e.getMessage());
    }
}

}

我已经尝试在onHandleIntent内部放置

        Sensor mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        Sensor mGravity = mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);
        mSensorManager.registerListener(this,mAccelerometer,SensorManager.SENSOR_DELAY_FASTEST);
        mSensorManager.registerListener(this,mGravity,SensorManager.SENSOR_DELAY_FASTEST);

编译但是在套接字的另一端没有检测到数据(即使我尝试记录它也没有检测到数据，所以实际的SensorEventListener

Answer 1

问题似乎在于

Sensor mGravity = mSensorManager.getDefaultSensor(Sensor.TYPE_GRAVITY);

与

不同

 Sensor mGravity = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

一旦我改变了这一点，一切都变得魅力十足。