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    <p>You can use <code>class MagicAppRestart</code> from <a href="https://stackoverflow.com/a/13173279/755804">this post</a> to <strong><em>kill the process</em></strong> along with all AsyncTasks; Android will restore the activity stack (the user will not mention anything). It is important to note that the only notification before a process restart is calling <code>onPause()</code>; according to the <a href="http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle" rel="nofollow noreferrer">Android app lifecycle logic</a>, your application must be ready to such termination anyway.</p> <p>I have tried it, and it seems to work. Nevertheless, at the the moment I plan to use "more civilized" methods like weak references from the Application class (my AsyncTasks are rather short-living and hopefully not so much memory-consuming).</p> <p>Here is some code you can play with:</p> <p><em>MagicAppRestart.java</em></p> <pre><code>package com.xyz; import android.app.Activity; import android.content.Intent; import android.os.Bundle; /** This activity shows nothing; instead, it restarts the android process */ public class MagicAppRestart extends Activity { // Do not forget to add it to AndroidManifest.xml // &lt;activity android:name="your.package.name.MagicAppRestart"/&gt; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); System.exit(0); } public static void doRestart(Activity anyActivity) { anyActivity.startActivity(new Intent(anyActivity.getApplicationContext(), MagicAppRestart.class)); } } </code></pre> <p>The rest is what Eclipse created for a new Android project for <em>com.xyz.AsyncTaskTestActivity</em>:</p> <p><em>AsyncTaskTestActivity.java</em></p> <pre><code>package com.xyz; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; import android.view.View; public class AsyncTaskTestActivity extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { Log.d("~~~~","~~~onCreate ~~~ "+this); super.onCreate(savedInstanceState); setContentView(R.layout.main); } public void onStartButton(View view) { Log.d("~~~~","~~~onStartButton {"); class MyTask extends AsyncTask&lt;Void, Void, Void&gt; { @Override protected Void doInBackground(Void... params) { // TODO Auto-generated method stub Log.d("~~~~","~~~doInBackground started"); try { for (int i=0; i&lt;10; i++) { Log.d("~~~~","~~~sleep#"+i); Thread.sleep(200); } Log.d("~~~~","~~~sleeping over"); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } Log.d("~~~~","~~~doInBackground ended"); return null; } @Override protected void onPostExecute(Void result) { super.onPostExecute(result); taskDone(); } } MyTask task = new MyTask(); task.execute(null); Log.d("~~~~","~~~onStartButton }"); } private void taskDone() { Log.d("~~~~","\n\n~~~taskDone ~~~ "+this+"\n\n"); } public void onStopButton(View view) { Log.d("~~~~","~~~onStopButton {"); MagicAppRestart.doRestart(this); Log.d("~~~~","~~~onStopButton }"); } public void onPause() { Log.d("~~~~","~~~onPause ~~~ "+this); super.onPause(); } public void onStop() { Log.d("~~~~","~~~onStop ~~~ "+this); super.onPause(); } public void onDestroy() { Log.d("~~~~","~~~onDestroy ~~~ "+this); super.onDestroy(); } } </code></pre> <p><em>main.xml</em></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;Button android:text="Start" android:onClick="onStartButton" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;Button android:text="Stop" android:onClick="onStopButton" android:layout_width="fill_parent" android:layout_height="wrap_content"/&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/hello" /&gt; &lt;/LinearLayout&gt; </code></pre> <p><em>AndroidManifest.xml</em></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.xyz" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="7" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" &gt; &lt;activity android:name=".AsyncTaskTestActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;activity android:name=".MagicAppRestart"/&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>and a relevant part of the logs (note that <strong><em>only <code>onPause</code> is called</em></strong>):</p> <pre><code>D/~~~~ (13667): ~~~onStartButton { D/~~~~ (13667): ~~~onStartButton } D/~~~~ (13667): ~~~doInBackground started D/~~~~ (13667): ~~~sleep#0 D/~~~~ (13667): ~~~sleep#1 D/~~~~ (13667): ~~~sleep#2 D/~~~~ (13667): ~~~sleep#3 D/~~~~ (13667): ~~~sleep#4 D/~~~~ (13667): ~~~sleep#5 D/~~~~ (13667): ~~~sleep#6 D/~~~~ (13667): ~~~sleep#7 D/~~~~ (13667): ~~~sleep#8 D/~~~~ (13667): ~~~sleep#9 D/~~~~ (13667): ~~~sleeping over D/~~~~ (13667): ~~~doInBackground ended D/~~~~ (13667): D/~~~~ (13667): D/~~~~ (13667): ~~~taskDone ~~~ com.xyz.AsyncTaskTestActivity@40516988 D/~~~~ (13667): D/~~~~ (13667): ~~~onStartButton { D/~~~~ (13667): ~~~onStartButton } D/~~~~ (13667): ~~~doInBackground started D/~~~~ (13667): ~~~sleep#0 D/~~~~ (13667): ~~~sleep#1 D/~~~~ (13667): ~~~sleep#2 D/~~~~ (13667): ~~~sleep#3 D/~~~~ (13667): ~~~sleep#4 D/~~~~ (13667): ~~~sleep#5 D/~~~~ (13667): ~~~onStopButton { I/ActivityManager( 81): Starting: Intent { cmp=com.xyz/.MagicAppRestart } from pid 13667 D/~~~~ (13667): ~~~onStopButton } D/~~~~ (13667): ~~~onPause ~~~ com.xyz.AsyncTaskTestActivity@40516988 I/ActivityManager( 81): Process com.xyz (pid 13667) has died. I/WindowManager( 81): WIN DEATH: Window{4073ceb8 com.xyz/com.xyz.AsyncTaskTestActivity paused=false} I/ActivityManager( 81): Start proc com.xyz for activity com.xyz/.AsyncTaskTestActivity: pid=13698 uid=10101 gids={} I/ActivityManager( 81): Displayed com.xyz/.AsyncTaskTestActivity: +44ms (total +65ms) D/~~~~ (13698): ~~~onCreate ~~~ com.xyz.AsyncTaskTestActivity@40517238 </code></pre>
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