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POHow to stop ( kill ) AsyncTask in android
 

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    <p>Hi I am new to android: </p> <p>I am displaying image thumbs in GridView. For better performance I am loading it asynchronously.</p> <p>My AsyncTask is as:</p> <pre><code>class BitmapWorkerTask extends AsyncTask&lt;Integer, Void, Bitmap&gt; { private final WeakReference&lt;ImageView&gt; imageViewReference; private int data = 0; private String image_path; public BitmapWorkerTask(ImageView imageView) { imageViewReference = new WeakReference&lt;ImageView&gt;(imageView); } @Override protected Bitmap doInBackground(Integer... params) { data = params[0]; Bitmap picture = BitmapFactory.decodeFile(image_path); int width = picture.getWidth(); int height = picture.getHeight(); float aspectRatio = (float) width / (float) height; int newWidth = 98; int newHeight = (int) (98 / aspectRatio); return picture = Bitmap.createScaledBitmap(picture, newWidth, newHeight, true); } @Override protected void onPostExecute(Bitmap bitmap) { if (imageViewReference != null &amp;&amp; bitmap != null) { final ImageView imageView = imageViewReference.get(); if (imageView != null) { imageView.setImageBitmap(bitmap); } } } public void onDismiss(DialogInterface dialog) { this.cancel(true); } } </code></pre> <p>and Calling form:</p> <pre><code>public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater layoutInflater = (LayoutInflater) ctx .getSystemService(Context.LAYOUT_INFLATER_SERVICE); ListRowHolder listRowHolder; if (convertView == null) { convertView = layoutInflater.inflate(R.layout.ll_sponsor_list_item, parent, false); listRowHolder = new ListRowHolder(); listRowHolder.imgSponsor = (ImageView) convertView .findViewById(R.id.imggrid_item_image); convertView.setTag(listRowHolder); } else { listRowHolder = (ListRowHolder) convertView.getTag(); } try { BitmapWorkerTask task = new BitmapWorkerTask( listRowHolder.imgSponsor); task.image_path = ImageName.get(position); task.execute(1); } catch (Exception e) { Toast.makeText(ctx, e + "", Toast.LENGTH_SHORT).show(); } return convertView; } </code></pre> <p>The problem here is the tasks are running in background even I clicked on back button.</p>
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    1. COYou can try `cancel(true)` not guaranteed to work always. Also if you call this, be ready to catch interrupt exceptions in `doInBackground`.
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