如何确定从传感器设备取向 [英] how to determine device orientation from the sensors

问题描述

我的活动锁定在景观。但我仍需要知道设备的方向。所以，我选择使用的传感器。我有以下的code

My activity is locked on LANDSCAPE. But still I need to know the orientation of the device. So I have elected to use sensors. I have the following code

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code未工作可靠，事实上， otateIconsToLandscapeMode（）从未达到。

我如何使用约方位，间距的信息和卷来确定设备的纵向或横向？`我希望我的问题是不够具体，保证一个明确的答案。谢谢你。

How do I use the information about azimuth, pitch, and roll to determine the PORTRAIT or LANDSCAPE orientation of the device?` I hope my question is specific enough to warrant a specific answer. Thanks.

推荐答案

在的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();

使用方向值可以判断是否在纵向或横向的设备

Using the orientation value you can determine whether the device in in Portrait or Landscape.

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