public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    Button galleryBtn = new Button(getActivity());
    galleryBtn.setText("Import Photo...");
    galleryBtn.setOnClickListener(v -> {
        Intent intent = new Intent();
        intent.setAction(Intent.ACTION_GET_CONTENT);
        intent.setType("image/*");
        this.startActivityForResult(intent, 0);
    });

    //... some more code here
}

//... some more code here

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == 0)
        try {
            if (data != null) {
                InputStream stream = getActivity().getContentResolver().openInputStream(
                    data.getData());
                imageBitmap = BitmapFactory.decodeStream(stream);
                stream.close();

                imageView.setImageBitmap(imageBitmap);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
}

imageBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.image);

public class ImageBox {
    public static Queue<Bitmap> mQ = new LinkedBlockingQueue<Bitmap>();
}

private void downloadFile(final String url){
        mExecutorService.submit(new Runnable() {
            @Override
            public void run() {
                Bitmap b = BitmapFromURL.getBitmapFromURL(url);
                synchronized (this){
                    TaskCount--;
                }
                Intent i = new Intent(ACTION_ON_GET_IMAGE);
                ImageBox.mQ.offer(b);
                sendBroadcast(i);
                if(TaskCount<=0)stopSelf();
            }
        });
}

private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            LOG.d(TAG, "BroadcastReceiver get broadcast");

            String action = intent.getAction();
            if (DownLoadImageService.ACTION_ON_GET_IMAGE.equals(action)) {
                Bitmap b = ImageBox.mQ.poll();
                if(b==null)return;
                if(mListener!=null)mListener.OnGetImage(b);
            }
        }
};