Saving an image after getting folder from Storage

I set a preference for users to select save folder for my app using Storage Access Framework. After getting uri onActivityResult I save it to SharedPreferences as String and save image when it's to be saved.

I'm using this method to save image successfully.

public void saveImageWithDocumentFile(String uriString, String mimeType, String name) {
    isImageSaved = false;
    try {
        Uri uri = Uri.parse(uriString);
        DocumentFile pickedDir = DocumentFile.fromTreeUri(this, uri);
        DocumentFile file = pickedDir.createFile(mimeType, name);
        OutputStream out = getContentResolver().openOutputStream(file.getUri());
        isImageSaved = mBitmap.compress(CompressFormat.JPEG, 100, out);
        out.close();

    } catch (IOException e) {
        throw new RuntimeException("Something went wrong : " + e.getMessage(), e);
    }
    Toast.makeText(MainActivity.this, "Image saved  " + isImageSaved, Toast.LENGTH_SHORT).show();
}

If user deletes the folder selected using SAF, iget null DocumentFile file and app crashes. My first question is how can i check if folder exist without opening SAF ui again.

I also want to use ParcelFileDescriptor to save same image with this method

public void saveImageWithParcelFileDescriptor(String folder, String name) {
    if (mBitmap == null) {
        Toast.makeText(MainActivity.this, "", Toast.LENGTH_SHORT).show();
        return;
    }
    String image = folder + File.separator + name + ".jpg";
    Toast.makeText(MainActivity.this, "image " + image, Toast.LENGTH_LONG).show();

    Uri uri = Uri.parse(image);
    ParcelFileDescriptor pfd = null;
    FileOutputStream fileOutputStream = null;
    try {
        pfd = getContentResolver().openFileDescriptor(uri, "w");
        fileOutputStream = new FileOutputStream(pfd.getFileDescriptor());
        mBitmap.compress(CompressFormat.JPEG, 100, fileOutputStream);

    } catch (FileNotFoundException e) {
        e.printStackTrace();
    } finally {
        if (pfd != null) {
            try {
                pfd.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        if (fileOutputStream != null) {
            try {
                fileOutputStream.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    Toast.makeText(MainActivity.this, "Image saved  " + isImageSaved, Toast.LENGTH_SHORT).show();

}

i get java.lang.IllegalArgumentException: Invalid URI: content://com.android.externalstorage.documents/tree/612E-B7BF%3Aname/imagePFD.jpg on linepfd = getContentResolver().openFileDescriptor(uri, "w");

This is how I call this method, currentFolder is the folder I get using intent and same folder on first method.

saveImageWithParcelFileDescriptor(currentFolder, "imagePFD");

How can I fix this, and which method is more preferable and why?

how can i check if folder exist

DocumentFile has an exists() method. In theory, pickedDir.exists() should tell you if it exists. In practice, it is up to the storage provider.

I also want to use ParcelFileDescriptor to save same image with this method

That code has bugs:

You cannot grant yourself permissions using grantUriPermission()
You cannot invent arbitrary Uri values via concatenation, particularly for a provider that is not yours