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    <p>This is how I achieved it finally. Note that the AsyncTask cancel(true) method is useless in my scenario because of the recursion. I used what @CommonsWare suggested - used a flag to indicate whether any more tasks should be executed.</p> <pre><code>public class MyActivity extends Activity { /*Flag which indicates whether the execution should be halted or not.*/ private boolean mCancelFlag = false; private AjaxRequestTask mAjaxTask; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); if(mAjaxTask == null){ mAjaxTask = new AjaxRequestTask(); } mAjaxTask.execute(MY_REST_API_URL); } @Override protected void onResume() { super.onResume(); mCancelFlag = false; /*when we resume, we want the tasks to restart. Unset cancel flag*/ /* If the main task is Finished, create a new task and execute it.*/ if(mAjaxTask == null || mAjaxTask.getStatus().equals(AsyncTask.Status.FINISHED)){ new AjaxRequestTask().execute(TLS_REST_API_URL); } } @Override protected void onPause() { mCancelFlag = true; /*We want the execution to stop on pause. Set the cancel flag to true*/ super.onPause(); } @Override protected void onDestroy() { mCancelFlag = true;/*We want the execution to stop on destroy. Set the cancel flag to true*/ super.onDestroy(); } private void updateReadings(String result) { //Update the UI using the new readings. } class AjaxRequestTask extends AsyncTask&lt;String, Integer, String&gt; { private AjaxRequestTask mChainAjaxRequest; private Timer mTimer; private TimerTask mTimerTask; @Override protected String doInBackground(String... restApiUrl) { //Do AJAX call and get the response return ajaxResponse; } @Override protected void onPostExecute(String result) { Log.d(TAG, "Updating readings"); updateReadings(result); // super.onPostExecute(result); if(mTimer == null){ mTimer = new Timer(); } if(!mCancelFlag){/*Check if the task has been cancelled prior to creating a new TimerTask*/ if(mTimerTask == null){ mTimerTask = new TimerTask() { @Override public void run() { if(!mCancelFlag){/*One additional level of checking*/ if(mChainAjaxRequest == null){ mChainAjaxRequest = new AjaxRequestTask(); } mChainAjaxRequest.execute(MY_REST_API_URL); } } }; } mTimer.schedule(mTimerTask,TIMER_ONE_TIME_EXECUTION_DELAY); } } } } </code></pre>
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    1. POAndroid: Implication of using AsyncTask to make repeated Ajax Calls
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