Android图像旋转在不同设备之间发生变化

Question

我正在尝试拍摄一张照片，并将位图设置为图像视图。但是得到的位图在不同的设备上会有不同的旋转。

一个是三星j5 prime (180度)，一个是LG G3 (我根据这个设备写的代码很正常)，两个都是Android6.0(实际上samsuung是6.0.1，但我不认为这有什么区别)

这是我的代码：

private int findImageRotation(Uri uri) throws IOException {
    ExifInterface ei = new ExifInterface(uri.getPath());
    int orientation = ei.getAttributeInt(ExifInterface.TAG_ORIENTATION, ExifInterface.ORIENTATION_UNDEFINED);
    int degree = 0;

    switch (orientation) {
        case ExifInterface.ORIENTATION_ROTATE_270:
            degree = 270;
            break;
        case ExifInterface.ORIENTATION_ROTATE_180:
            degree = 180;
            break;
        case ExifInterface.ORIENTATION_ROTATE_90:
            degree = 90;
            break;
        case ExifInterface.ORIENTATION_NORMAL:
        default:
            break;
    }

    return degree;
}

private Bitmap rotateImage(Bitmap source, float angle) {
    Matrix matrix = new Matrix();
    matrix.postRotate(angle);
    return Bitmap.createBitmap(source, 0, 0, source.getWidth(), source.getHeight(), matrix, true);
}

private void imageToBase64(final Uri uri, final Base64ConvertListener listener) {
    new Handler().post(new Runnable() {
        @Override
        public void run() {
            Bitmap bitmap;
            try {
                int degree = findImageRotation(uri);
                bitmap = BitmapFactory.decodeStream(getContext().getContentResolver().openInputStream(uri));
                bitmap = rotateImage(bitmap, degree - 90);
                if (bitmap != null) {
                    String extension = getMimeType(getContext(), uri);
                    ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();

                    if (extension.toLowerCase().contains("png"))
                        bitmap.compress(Bitmap.CompressFormat.PNG, 50, byteArrayOutputStream);
                    else if (extension.toLowerCase().contains("jpg") || extension.toLowerCase().contains("jpeg"))
                        bitmap.compress(Bitmap.CompressFormat.JPEG, 50, byteArrayOutputStream);

                    ivHostImage.setImageBitmap(bitmap);
                    byte[] byteArray = byteArrayOutputStream.toByteArray();
                    listener.onConvertedToBase64("data:" + extension + ";base64," + Base64.encodeToString(byteArray, Base64.DEFAULT));

                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    });
}

Answer 1

你试过手动旋转它们吗？

 ExifInterface exif;

           try {

             exif = new ExifInterface(photoPath);//uri.getPath()

              } 

           catch (IOException e) {

            e.printStackTrace();

            exif = null;

              }

            if(exif!=null){

            orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);   

            }

          //get Bitmap
          Bitmpam bitm = ..... ;
    //i think in your example
    //is like :  bitmap = BitmapFactory.decodeStream(getContext().getContentResolver().openInputStream(uri));


           if(orientation==8){//exception1
               Matrix matrix = new Matrix();
               matrix.postRotate(270);
               bitm = Bitmap.createBitmap(bitm, 0, 0, bitm.getWidth(), bitm.getHeight(), matrix, true); 
                    }
           if(orientation==6){//exception2
               Matrix matrix = new Matrix();
               matrix.postRotate(90);
               bitm = Bitmap.createBitmap(bitm, 0, 0, bitm.getWidth(), bitm.getHeight(),matrix,true);
                    }
           if(orientation==3){//exception3
               Matrix matrix = new Matrix();
               matrix.postRotate(180);
               bitm = Bitmap.createBitmap(bitm, 0, 0, bitm.getWidth(), bitm.getHeight(),matrix,true);
               }

这对我很管用。