为什么我有这种旋转的图像？

Question

在我的应用中，我需要从相机加载图像。

这是我用过的代码：

private void openCamera()
{
    mMediaUri =getOutputMediaFileUri(MEDIA_TYPE_IMAGE);

    Intent photoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
    photoIntent.putExtra(MediaStore.EXTRA_OUTPUT, mMediaUri);
    startActivityForResult(photoIntent, REQUEST_TAKE_PHOTO);


}


private Uri getOutputMediaFileUri(int mediaTypeImage)
{
    //check for external storage
    if(isExternalStorageAvaiable())
    {
        File mediaStorageDir = getActivity().getExternalFilesDir(Environment.DIRECTORY_PICTURES);

        String fileName = "";
        String fileType = "";
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new java.util.Date());

        fileName = "IMG_"+timeStamp;
        fileType = ".jpg";

        File mediaFile;
        try
        {
            mediaFile = File.createTempFile(fileName,fileType,mediaStorageDir);
            Log.i("st","File: "+Uri.fromFile(mediaFile));
        }
        catch (IOException e)
        {
            e.printStackTrace();
            Log.i("St","Error creating file: " + mediaStorageDir.getAbsolutePath() +fileName +fileType);
            return null;
        }
        return FileProvider.getUriForFile(getActivity(),BuildConfig.APPLICATION_ID + ".provider", mediaFile);
    }
    //something went wrong
    return null;

}

private boolean isExternalStorageAvaiable()
{
    String state = Environment.getExternalStorageState();

    if(Environment.MEDIA_MOUNTED.equals(state))
    {
        return true;
    }
    else
    {
        return false;
    }


}

   public void onActivityResult(int requestCode, int resultCode, Intent data)
{
    super.onActivityResult(requestCode, resultCode, data);

   if(resultCode == DIALOG_CODE)
    {
        String s = data.getStringExtra("choose");

        if(s.equals(getString(R.string.takephoto)))
        {
          openCamera();
        }
        else if(s.equals(getString(R.string.library)))
        {
          openGallery();
        }
    }
    else if(resultCode == RESULT_OK)
    {
        if (requestCode == REQUEST_TAKE_PHOTO || requestCode == REQUEST_PICK_PHOTO) //dalla fotocamera
        {
            if (data != null)  //caso galleria
            {
                mMediaUri = data.getData();
            }

            Picasso.with(getActivity()).load(mMediaUri).resize(1280, 1280).transform(new RoundedTransformation()).centerCrop().into(photo, new Callback()
            {
                public void onSuccess()
                {

                }

                @Override
                public void onError() {

                }
            });
        }
    }

}

它有效，但它给了我这个错误：如果我拍这样的照片：

以这种方式在imageview中加载图片：

但如果我从图库中加载图片，它就可以了。

这里的错误是什么？ 感谢

Answer 1

您必须使用ExifInterface旋转图像。
图像根据图像捕获角度旋转。

即使您从任何角度点击照片，

ExifInterface也会旋转图像。
它会正确显示。

    File mediaFile = new File(mediaPath);
            Bitmap bitmap;
            if (mediaFile.exists()) {

                if (isImage(mediaPath)) {

                    Bitmap myBitmap = BitmapFactory.decodeFile(mediaFile.getAbsolutePath());
                    int height = (myBitmap.getHeight() * 512 / myBitmap.getWidth());
                    Bitmap scale = Bitmap.createScaledBitmap(myBitmap, 512, height, true);
                    int rotate = 0;
                    try {
                        exif = new ExifInterface(mediaFile.getAbsolutePath());
                    } catch (IOException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                    }
                    int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION,
                            ExifInterface.ORIENTATION_UNDEFINED);
                    switch (orientation) {
                    case ExifInterface.ORIENTATION_NORMAL:
                        rotate = 0;
                        break;
                    case ExifInterface.ORIENTATION_ROTATE_270:
                        rotate = 270;
                        break;
                    case ExifInterface.ORIENTATION_ROTATE_180:
                        rotate = 180;
                        break;
                    case ExifInterface.ORIENTATION_ROTATE_90:
                        rotate = 90;
                        break;
                    }

                    Matrix matrix = new Matrix();
                    matrix.postRotate(rotate);
                    Bitmap rotateBitmap = Bitmap.createBitmap(scale, 0, 0, scale.getWidth(),
                            scale.getHeight(), matrix, true);
                    displayImage.setImageBitmap(rotateBitmap);
       }
}
public static boolean isImage(String str) {
        boolean temp = false;
        String[] arr = { ".jpeg", ".jpg", ".png", ".bmp", ".gif" };
        for (int i = 0; i < arr.length; i++) {
            temp = str.endsWith(arr[i]);
            if (temp) {
                break;
            }
        }
        return temp;
    }