Converting Url to Uri and passing it to AsyncTask<>

Issue

I am converting a Url to Uri in the following way

imgUrl = intent.getStringExtra(getString(R.string.selected_image));
            Log.d(TAG, "Image URL" + imgUrl);
                imageUri = Uri.parse(imgUrl) ;
            Log.d(TAG, "Image URI" + imageUri);

then passing it to this function

 BackgroundImageResize backgroundImageResize = new BackgroundImageResize(bitmap);
           backgroundImageResize.execute(imageUri);

and BackgroundImageResize takes arguments as

public class BackgroundImageResize extends AsyncTask<Uri, Integer, byte[]>

now this method

Log.d(TAG, "doInBackground: megabytes before compression: " + mBitmap.getByteCount() / 1000000 );
        bytes = getBytesFromBitmap(mBitmap, 100);
        Log.d(TAG, "doInBackground: megabytes before compression: " + bytes.length / 1000000 );

is returning this error

Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'int android.graphics.Bitmap.getByteCount()' on a null object reference

in previous discussions with a really smart person, it has been concluded that, maybe, the Uri is incorrect

How do I pass the correct Uri ?

this is the doInBackground() just in case

@Override
    protected byte[] doInBackground(Uri... params) {
        Log.d(TAG, "doInBackground: started.");

        if(mBitmap == null){
            try{
                mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);
            }catch (IOException e){
                Log.e(TAG, "doInBackground: IOException: " + e.getMessage());
            }
        }
        byte[] bytes = null;
        Log.d(TAG, "doInBackground: megabytes before compression: " + mBitmap.getByteCount() / 1000000 );
        bytes = getBytesFromBitmap(mBitmap, 100);
        Log.d(TAG, "doInBackground: megabytes before compression: " + bytes.length / 1000000 );
        return bytes;
    }

I suspect that this line of code

mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);

is not doing it's job :P

Solution

Please add the 2 Logs with the ++++++++++++ lines in your doInBackGround() and post your Logcat:

@Override
protected byte[] doInBackground(Uri... params) {
    Log.d(TAG, "doInBackground: started.");

    Log.d(TAG, "+++++++++++++ params[0]: " + params[0]);

    if(mBitmap == null){
        try{
            mBitmap = MediaStore.Images.Media.getBitmap(NextActivity.this.getContentResolver(), params[0]);
        }catch (IOException e){
            Log.e(TAG, "doInBackground: IOException: " + e.getMessage());
        }
    }

    Log.d(TAG, "+++++++++++++ mBitmap: " + mBitmap);

    byte[] bytes = null;
    Log.d(TAG, "doInBackground: megabytes before compression: " + mBitmap.getByteCount() / 1000000 );
    bytes = getBytesFromBitmap(mBitmap, 100);
    Log.d(TAG, "doInBackground: megabytes before compression: " + bytes.length / 1000000 );
    return bytes;
}

Answered By - Locdoc01