Android 拍照后方向旋转问题

1. 假定为 横屏应用 ，这时无需设定Camera预览时的 display orientation，当手持为横屏时（home键在右侧）无需旋转，其它手持方向都需要旋转数据。
   屏幕方向.jpg

2. 获取屏幕方向:

• 获取设备角度

mOrientationListener = new OrientationEventListener(getApplicationContext(), SensorManager.SENSOR_DELAY_NORMAL) {
     @Override
     public void onOrientationChanged(int orientation) {
               mOrientation = orientation;
          }
       };
       try {
              mOrientationListener.enable();
           } catch (Exception e) {
               log(e.toString());
           }

• 根据设备角度计算出屏幕方向

public static  ScreenOrientation getCameraDeviceOritation(int orientation){

       ScreenOrientation newOrientation = ScreenOrientation.LANDSCAPE;

       if (orientation >= 45 && orientation < 135)

       {
           newOrientation = ScreenOrientation.REVERSED_LANDSCAPE;

       }

       else if (orientation >= 135 && orientation < 225)

       {
           newOrientation = ScreenOrientation.REVERSED_PORTRAIT;

       }

       else if (orientation >= 225 && orientation < 315)

       {
           newOrientation = ScreenOrientation.LANDSCAPE;

       }else if((orientation >= 315 && orientation<=360) || (orientation>=0&&orientation < 45))
       {
           newOrientation = ScreenOrientation.PORTRAIT;
       }

       return newOrientation;

   }

3. 根据屏幕角度旋转

• 旋转

             if (!frontCam)
                {
                    if (ortation == ScreenOrientation.LANDSCAPE)
                        bitmapRotated = gBmp;
                    if (ortation == ScreenOrientation.PORTRAIT)
                        bitmapRotated = CameraUtils.rotaingImageView(90, gBmp);
                    if(ortation == ScreenOrientation.REVERSED_PORTRAIT)
                        bitmapRotated = CameraUtils.rotaingImageView(-90, gBmp);
                    if (ortation == ScreenOrientation.REVERSED_LANDSCAPE)
                        bitmapRotated = CameraUtils.rotaingImageView(180, gBmp);
                }
                 else
                {
                    if (ortation == ScreenOrientation.LANDSCAPE)
                        bitmapRotated = gBmp;
                    if (ortation == ScreenOrientation.PORTRAIT)
                        bitmapRotated = CameraUtils.rotaingImageView(270, gBmp);
                    if (ortation == ScreenOrientation.REVERSED_PORTRAIT)
                        bitmapRotated = CameraUtils.rotaingImageView(90, gBmp);
                    if (ortation == ScreenOrientation.REVERSED_LANDSCAPE)
                        bitmapRotated = CameraUtils.rotaingImageView(180, gBmp);
                }
  
    public static Bitmap rotaingImageView(int angle, Bitmap bitmap)
    {
        //旋转图片 动作
        Matrix matrix = new Matrix(); ;
        matrix.postRotate(angle);
  
        // 创建新的图片
        Bitmap resizedBitmap = null;
        try{
            resizedBitmap = Bitmap.createBitmap(bitmap, 0, 0,
                    bitmap.getWidth(), bitmap.getHeight(), matrix, true);
        }catch (Exception e){
           e.printStackTrace();
        }
  
        return resizedBitmap;
    }