trying to cancel AsyncTask almost there just a little push

im trying to get the cancel a loop by calling cancel but it wont cancel out out. can you tell why it wont cancel out.. here is the code

Code:

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class MyAsyncTask extends AsyncTask<Object, Void, Void>
{
    @Override
    protected void onCancelled()
    {
        super.onCancelled();
        this.cancel(true);

        Log.d( String.valueOf( isCancelled() ), "onCancelled() called");
    }

    @Override
    protected Void doInBackground(Object... params)
    {
        while (!isCancelled())
        {
            Log.d( String.valueOf( isCancelled() ), "inside the loop");
            if (isCancelled())
                break;
        }
        return null;
    }
}

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here is the call

Code:

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new MyAsyncTask().execute();

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and here is the call to cancel it

Code:

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AsyncTask task = new MyAsyncTask().execute();
task.cancel(true);

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Cheers!