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POHow do I programmatically "restart" an Android app?
 

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  1. POHow do I programmatically "restart" an Android app?
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    <p>Firstly, I know that one should not really kill/restart an application on Android. In my use case I want to factory-reset my application in a specific case where a server sends a specific information to the client.</p> <p>The user can only be logged in on the server with ONE instance of the application (i.e. multiple devices are not allowed). If another instance gets that "logged-in"-lock then all other instances of that user have to delete their data (factory-reset), to maintain consistency.</p> <p>It is possible to forcibly get the lock, because the user might delete the app and reinstall it which would result in a different instance-id and the user would not be able to free the lock any more. Therefore it is possible to forcibly get the lock.</p> <p>Because of that force-possibility we need to always check in an concrete instance that it has the lock. That is done on (almost) each request to the server. The server might send a "wrong-lock-id". If that is detected, the client application must delete everything.</p> <hr> <p>That was the use-case. No for the implementation-question:</p> <p>I have an <code>Activity</code> A that starts the Login <code>Activity</code> L or the app's main <code>Activity</code> B depending on a sharedPrefs field. After starting L or B it closes itself so that only L or B is running. So in the case that the user is logged in already B is running now.</p> <p>B starts C. C calls <code>startService</code> for the <code>IntentService</code> D. That results in this stack:</p> <p>(A) > B > C > D</p> <p>From the onHandleIntent method of D an event is send to a <a href="http://developer.android.com/reference/android/os/ResultReceiver.html" rel="noreferrer">ResultReceiver</a> R.</p> <p>R now handles that event by providing the user a dialog where he can choose to factory-reset the application (delete the database, sharedPrefs, etc.)</p> <p>After the factory-reset I want to restart the application (to close all activities) and only start A again which then launches the login <code>Activity</code> L and finishes itself:</p> <p>(A) > L</p> <p>The Dialog's onClick-method looks like this:</p> <pre><code>@Override public void onClick(DialogInterface dialog, int which) { // Will call onCancelListener MyApplication.factoryReset(); // (Deletes the database, clears sharedPrefs, etc.) Intent i = new Intent(MyApp.getContext(), A.class); i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); MyApp.getContext().startActivity(i); } </code></pre> <p>And that's the <code>MyApp</code> class:</p> <pre><code>public class MyApp extends Application { private static Context context; @Override public void onCreate() { super.onCreate(); context = getApplicationContext(); } public static Context getContext() { return context; } public static void factoryReset() { // ... } } </code></pre> <p>The problem now is that if I use the <code>FLAG_ACTIVITY_NEW_TASK</code> the Activities B and C are still running. If I hit the back button on the login <code>Activity</code> I see C, but I want to go back to the home screen.</p> <p>If I do not set the <code>FLAG_ACTIVITY_NEW_TASK</code> I get the error:</p> <pre><code>07-07 12:27:12.272: ERROR/AndroidRuntime(9512): android.util.AndroidRuntimeException: Calling startActivity() from outside of an Activity context requires the FLAG_ACTIVITY_NEW_TASK flag. Is this really what you want? </code></pre> <p>I cannot use the Activities' <code>Context</code>, because the <code>ServiceIntent</code> D might also be called from an background task which is started by the <code>AlarmManager</code>.</p> <p>So how could I solve this to the activity stack becoming (A) > L?</p>
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