Question

我一直在试图弄清楚EXIF一段时间，我刚发出问题后问题。我希望有人可以为我阐明这一点。

我有一个用户按下的按钮，它实现了这个意图

Intent intent = new Intent();
// Show only images, no videos or anything else
intent.setType("image/*");
intent.setAction(Intent.ACTION_GET_CONTENT);
// Always show the chooser (if there are multiple options available)
startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);

PICK_IMAGE_REQUEST如下

private int PICK_IMAGE_REQUEST = 1;

这是我的OnActivityResult。

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {

        mMediaUri = data.getData();

        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), mMediaUri);

            String fileName2 = FileHelper.getFileName(UserProfileActivity.this, mMediaUri, "image");
            try {
                ExifInterface exifInterface = new ExifInterface(fileName2);
                int orientation = exifInterface.getAttributeInt(ExifInterface.TAG_ORIENTATION, 1);
                System.out.println(orientation + "---------------------------");
                Matrix matrix = new Matrix();
                if (orientation == 6) {
                    System.out.println("oritation 6, rotate 90");
                    matrix.postRotate(90);
                } else if (orientation == 3) {
                    System.out.println("oritation 3, rotate 180");
                    matrix.postRotate(180);
                } else  if (orientation == 8) {
                    System.out.println("oritation 8, rotate 270");
                    matrix.postRotate(270);
                }
                bitmap = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
            } catch (Exception e) {
                System.out.println(e.getMessage());
            }

            //friendsProfilePic imageView = (ImageView) findViewById(R.id.imageView);
            if (userChangedImage){
                userProfileImage.setImageBitmap(bitmap);
            }
            userProfileImageEditProfile.setImageBitmap(bitmap);

            final ParseQuery<ParseUser> queryUser = ParseUser.getQuery();
            try {
                byte[] fileBytes = FileHelper.getByteArrayFromFile(UserProfileActivity.this, mMediaUri);
                if (fileBytes == null) {
                    //there was an error
                    Toast.makeText(getApplicationContext(), "There was an error. Try again!", Toast.LENGTH_LONG).show();
                } else {
                    fileBytes = FileHelper.reduceImageForUpload(fileBytes);
                    String fileName = FileHelper.getFileName(UserProfileActivity.this, mMediaUri, "image");
                    userChangedImageFile = new ParseFile(fileName, fileBytes);
                    userChangedImage = true;
                }
            } catch (Exception e1) {
                e1.printStackTrace();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

最后，这就是在控制台内部阅读的内容。

System.out: image.png (No such file or directory)

对此的任何帮助将不胜感激!! 感谢

Answer 1

FileHelper.getFileName()几乎肯定是错误的，因为Uri无需表示文件。我强烈建议你完全摆脱它。

使用ContentResolver（来自getContentResolver()上的Activity）和openInputStream()获取InputStream标识的内容Uri 。您可以将其传递给a constructor on the support library edition of ExifInterface以尝试获取方向标记（如果存在）。

Answer 2

你应该使用compat ExifInterface。

com.android.support:exifinterface:${lastLibVersion}

您将能够使用InputStream（来自ContentResolver）而不是uri路径来实例化ExifInterface（pior API＆lt; 24），而不是“文件未找到异常”

https://android-developers.googleblog.com/2016/12/introducing-the-exifinterface-support-library.html

Exif信息轮换获取文件未找到异常

2 个答案: