How to save img url to String, and then used it?

Here I keep

@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) {

        Uri uri = data.getData();


        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getContentResolver(), uri);
            imageView = (ImageView) findViewById(R.id.image);
            imageView.setImageBitmap(bitmap);
            uriImg = uri.toString();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

And I try to read it. But nothing to open. Url is exist content: // media / external / images / media / 64

File imgFile = new  File(uriImg);
if (imgFile.getAbsoluteFile().exists()){
                    Bitmap myBitmap = BitmapFactory.decodeFile(imgFile.getAbsolutePath());
                    imageView.setImageBitmap(myBitmap);