android上下左右摄像头

做摄像头拍照功能时，经常需要切换屏幕方向。

横竖屏切换时我们可以通过onConfigurationChanged监听，然后动态去设置方向

public static void setCameraDisplayOrientation (Activity activity, int cameraId, android.hardware.Camera camera) {
   android.hardware.Camera.CameraInfo info = new android.hardware.Camera.CameraInfo();
   android.hardware.Camera.getCameraInfo (cameraId , info);
   int rotation = activity.getWindowManager ().getDefaultDisplay ().getRotation ();
   int degrees = 0;
   switch (rotation) {
       case Surface.ROTATION_0:
           degrees = 0;
           break;
       case Surface.ROTATION_90:
           degrees = 90;
           break;
       case Surface.ROTATION_180:
           degrees = 180;
           break;
       case Surface.ROTATION_270:
           degrees = 270;
           break;
   }
   int result;
   if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
       result = (info.orientation + degrees) % 360;
       result = (360 - result) % 360; // compensate the mirror
   } else {
       // back-facing
       result = ( info.orientation - degrees + 360) % 360;
   }
   camera.setDisplayOrientation (result);
}
但是当我们180上下切换屏幕时却不会触发onConfigurationChanged事件，一开始我使用方向传感器监听

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mOrientation = mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION);

@Override
   public void onSensorChanged(SensorEvent event){
       int rotation = getWindowManager().getDefaultDisplay().getRotation();
       if(rotation != oldOrientation){

               cameraManager.setoriention();
       }
       oldOrientation = rotation;
   }

我试了之后有的手机成功了，但有的出现问题了mOrientation为空，而且Sensor.TYPE_ORIENTATION已经过时了，

最后使用

mOrientation = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
       accsensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
       if(mOrientation!=null){
           mSensorManager.registerListener(this, mOrientation, SensorManager.SENSOR_DELAY_FASTEST);
       }
       if(accsensor!=null){
           mSensorManager.registerListener(this, accsensor, SensorManager.SENSOR_DELAY_FASTEST);
       }

成功了

android上下左右摄像头

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