如何从传感器确定设备方向

Question

我的活动已锁定在 LANDSCAPE 上。但我仍然需要知道设备的方向。所以我选择使用传感器。我有以下代码

sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL);
...
@Override
  public void onSensorChanged(SensorEvent event) {
    float[] values = event.values;

    // Movement
    float azimuth = values[0];
    float pitch = values[1];
    float roll = values[2];

    if ((-110 <= pitch && pitch <= -70) || (70 <= pitch && pitch <= 110)) {
      //PORTRAIT MODE
      portraitPitch = true;
      landscapePitch = false;
      Log.d(TAG, "portrait mode: pitch = " + pitch);
    } else if ((-20 <= pitch && pitch <= 20) || (-200 <= pitch && pitch <= -160) || (160 <= pitch && pitch <= 200)) {
      //LANDSCAPE MODE
      portraitPitch = false;
      landscapePitch = true;
      Log.d(TAG, "landscape mode : pitch = " + pitch);
    }

    if ((-20 <= roll && roll <= 20)) {
      //PORTRAIT MODE
      portraitRoll = true;
      landscapePitch = false;
      Log.d(TAG, "portrait mode: roll = " + roll);
    } else if ((-110 <= roll && roll <= -70) || (70 <= roll && roll <= 110)) {
      //LANDSCAPE MODE
      portraitRoll = false;
      landscapePitch = true;
      Log.d(TAG, "landscape mode : roll = " + roll);
    }

    if (portraitPitch && portraitRoll && !portrait) {
      portrait = true;
      landscape = false;
      rotateIconsToPortraitMode();
      Log.d(TAG, "portrait mode for icons: pitch = " + pitch + ", roll = " + roll);
    }

    if (landscapePitch && landscapeRoll && !landscape) {
      landscape = true;
      portrait = false;
      rotateIconsToLandscapeMode();
      Log.d(TAG, "landscape mode for icons: pitch = " + pitch + ", roll = " + roll);
    }
}

我的代码工作不可靠，事实上，otateIconsToLandscapeMode()从未达到过。

我如何使用有关azimuth、pitch和的信息roll来确定设备的纵向或横向方向？`我希望我的问题足够具体以保证特定的答案。谢谢。

Answer 1

在oncreate实例化一个OrientationEventListener

OrientationEventListener orientationEventListener = new OrientationEventListener(this)
    {
        @Override
        public void onOrientationChanged(int orientation)
        {
            Log.d(TAG, "orientation = " + orientation);
        }
    }; 

    orientationEventListener.enable();

使用方向值可以确定设备是纵向还是横向。