Android怎么每隔300ms从方向传感器中获取一次角度值

要每隔300ms从方向传感器中获取一次角度值，可以使用如下代码：

private SensorManager sensorManager;
private Sensor sensor;
private long lastUpdate = 0;
private static final int SENSOR_DELAY = 300; // 传感器采样间隔，单位为毫秒

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);
}

@Override
protected void onResume() {
    super.onResume();
    sensorManager.registerListener(sensorEventListener, sensor, SENSOR_DELAY);
}

@Override
protected void onPause() {
    super.onPause();
    sensorManager.unregisterListener(sensorEventListener);
}

private SensorEventListener sensorEventListener = new SensorEventListener() {
    @Override
    public void onSensorChanged(SensorEvent event) {
        long currentTime = System.currentTimeMillis();
        if ((currentTime - lastUpdate) > SENSOR_DELAY) {
            lastUpdate = currentTime;
            float degree = event.values[0]; // 获取角度值
            // TODO: 处理角度值
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
};

在上述代码中，我们通过`SensorManager`获取了方向传感器，并在`onResume`中注册了传感器监听器，采样间隔为300ms，在`onPause`中注销了传感器监听器。在传感器监听器的回调函数`onSensorChanged`中，我们判断采样间隔是否达到300ms，如果达到，就获取角度值，并进行处理。