Android's AsyncTask for download asynchronously an image from an URL and assign it to an ImageView

DownloadImageTask.java

import java.io.InputStream;
import java.lang.ref.WeakReference;
import java.net.URL;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.util.Log;
import android.widget.ImageView;

public class DownloadImageTask extends AsyncTask<URL, Void, Bitmap> {
  
	private static final String LOG_E_TAG = "DownloadImageTask";
	private final  WeakReference<ImageView> containerImageView;
	
	public DownloadImageTask(ImageView imageView) {
		this.containerImageView = new WeakReference<ImageView>(imageView);
	}
	
	@Override
	protected Bitmap doInBackground(URL... params) {
		URL imageURL = params[0];
		Bitmap downloadedBitmap = null;
		try {
			InputStream inputStream = imageURL.openStream();
			downloadedBitmap = BitmapFactory.decodeStream(inputStream);
		} catch (Exception e) {
			Log.e(LOG_E_TAG, e.getMessage());
			e.printStackTrace();
		}
		return downloadedBitmap;
	}
	
	@Override
	protected void onPostExecute(Bitmap result) {
		ImageView imageView = this.containerImageView.get();
		if (imageView != null) {
			imageView.setImageBitmap(result);
		}
	}
}

when i make use of this.It is resulting the out of memory error and While Scrolling Images are reloading .There by it shows "Unfortunately app has beeen stopped"

My stream returns an empty string to the bitmap, what might be the reason?