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    <p>Easy:</p> <ol> <li><p>Create <code>interface</code> class, where <code>String output</code> is optional, or can be whatever variables you want to return. </p> <pre><code>public interface AsyncResponse { void processFinish(String output); } </code></pre></li> <li><p>Go to your <code>AsyncTask</code> class, and declare interface <code>AsyncResponse</code> as a field :</p> <pre><code>public class MyAsyncTask extends AsyncTask&lt;Void, Void, String&gt; { public AsyncResponse delegate = null; @Override protected void onPostExecute(String result) { delegate.processFinish(result); } } </code></pre></li> <li><p>In your main Activity you need to <code>implements</code> interface <code>AsyncResponse</code>.</p> <pre><code>public class MainActivity implements AsyncResponse{ MyAsyncTask asyncTask =new MyAsyncTask(); @Override public void onCreate(Bundle savedInstanceState) { //this to set delegate/listener back to this class asyncTask.delegate = this; //execute the async task asyncTask.execute(); } //this override the implemented method from asyncTask @Override void processFinish(String output){ //Here you will receive the result fired from async class //of onPostExecute(result) method. } } </code></pre></li> </ol> <hr> <p>UPDATE</p> <p>I didn't know this is such a favourite to many of you. So here's the simple and convenience way to use <code>interface</code>.</p> <p>still using same <code>interface</code>. FYI, you may combine this into <code>AsyncTask</code> class.</p> <p>in <code>AsyncTask</code> class :</p> <pre><code>public class MyAsyncTask extends AsyncTask&lt;Void, Void, String&gt; { // you may separate this or combined to caller class. public interface AsyncResponse { void processFinish(String output); } public AsyncResponse delegate = null; public MyAsyncTask(AsyncResponse delegate){ this.delegate = delegate; } @Override protected void onPostExecute(String result) { delegate.processFinish(result); } } </code></pre> <p>do this in your <code>Activity</code> class</p> <pre><code>public class MainActivity extends Activity { MyAsyncTask asyncTask = new MyAsyncTask(new AsyncResponse(){ @Override void processFinish(String output){ //Here you will receive the result fired from async class //of onPostExecute(result) method. } }).execute(); } </code></pre> <p>Or, implementing the interface on the Activity again </p> <pre><code>public class MainActivity extends Activity implements AsyncResponse{ @Override public void onCreate(Bundle savedInstanceState) { //execute the async task new MyAsyncTask(this).execute(); } //this override the implemented method from AsyncResponse @Override void processFinish(String output){ //Here you will receive the result fired from async class //of onPostExecute(result) method. } } </code></pre> <p>As you can see 2 solutions above, the first and third one, it needs to create method <code>processFinish</code>, the other one, the method is inside the caller parameter. The third is more neat because there is no nested anonymous class. Hope this helps</p> <p><strong>Tip</strong>: Change <code>String output</code>, <code>String response</code>, and <code>String result</code> to different matching types in order to get different objects. </p>
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    1. POHow to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?
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    1. USHelmiB
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    1. COTotally wrote all of that up and then saw your answer :) Here's to thinking alike! +1. Also this way multiple things can listen to the results of the AsyncTask!
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    2. COYes that's true, that's the function of `interface`. i forgot to set delegate though :). have added in `onCreate`.
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    3. COhi. so I tried this one but I can't get it to work. hmm,
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