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POAndroid: What Intent Flag to use so undestroyed Activity will not automatically show upon Notification
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copied!<p>I have 3 Activities</p> <p>A. MainActivity - just an Activity with a text and button on it</p> <p>B. SettingsActivity - this will be displayed if the button on (A) is clicked, this initializes time picker that will send a notification when it alarms</p> <p>C. DisplayNotification - activity for displaying notification in the status bar, when clicked, it should show A</p> <p>This is what I want to happen:</p> <ol> <li>I launch my application, A will be shown</li> <li>I click the button, B will be shown</li> <li>I set a time for the alarm</li> <li>When the alarm triggers, a notification is shown in the status bar</li> <li>If I click the notification, A will be shown</li> </ol> <p>This is what happens (I have 2 scenarios with different results):</p> <p>First scenario:</p> <ol> <li>After step 3, I tap the back button, A will now be shown</li> <li>Then, I tap again the back button, the onDestroy of A will be called and screen will show the 'home page' or 'desktop' of the phone</li> <li>I wait till the alarm triggers</li> <li>When the alarm triggers, notification is shown on the status bar</li> <li>I click the notification, it launches my app displaying A</li> <li>End of story. This is what is expected to happen</li> </ol> <p>Second scenario: (the buggy one)</p> <ol> <li>After step 3, I tap the HOME button, A's onDestroy is not yet called and the latest screen was B</li> <li>The screen shows the 'home page' or 'desktop' of the phone</li> <li>I wait till the alarm triggers</li> <li>When the alarm triggers, notification is shown on the status bar AND B was shown automatically without me clicking the notification on the status bar</li> <li>What I want to happen here is that it should not automatically display B activity.</li> </ol> <p>Am I missing any flags for notification or intent?</p> <p>Here is the code snippet for Activity B which triggers the alarm</p> <pre><code>AlarmManager alarmManager = (AlarmManager) getSystemService(ALARM_SERVICE); Intent i = new Intent(this, DisplayNotification.class); i.putExtra("NotifID", 1); PendingIntent displayIntent = PendingIntent.getActivity(getBaseContext(), 0, i, 0); alarmManager.setRepeating(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), AlarmManager.INTERVAL_DAY, displayIntent); </code></pre> <p>Here is the code for Activity C</p> <pre><code>public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); int notifID = getIntent().getExtras().getInt("NotifID"); Intent i = new Intent(this, MainActivity.class); i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); i.putExtra("NotifID", notifID); PendingIntent detailsIntent = PendingIntent.getActivity(this, 0, i, 0); NotificationManager nm = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Notification notif = new Notification(R.drawable.ic_launcher, "See activity!", System.currentTimeMillis()); notif.flags |= Notification.FLAG_AUTO_CANCEL; notif.defaults |= Notification.DEFAULT_SOUND; CharSequence from = "Notification from me"; CharSequence message = "See activity!"; notif.setLatestEventInfo(this, from, message, detailsIntent); nm.notify(notifID, notif); finish(); } </code></pre> <p>I hope someone would help me :)</p> <p>Thanks!</p> <p>Edit:</p> <p>Thanks Chirag_CID! I should have used Broadcast Receiver instead of another Activity. So, instead of extending Activity, the DisplayNotification now extends Broadcast Receiver. This is the onReceive method of DisplayNotification:</p> <pre><code>public void onReceive(Context context, Intent intent) { Log.d(TAG, "DisplayNotification onReceive"); int notifID = intent.getExtras().getInt("NotifID"); Intent i = new Intent(context, MainActivity.class); i.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP); i.putExtra("NotifID", notifID); PendingIntent detailsIntent = PendingIntent.getActivity(context, 0, i, 0); NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); Notification notif = new Notification(R.drawable.ic_launcher, "See the quote of the day!", System.currentTimeMillis()); notif.flags |= Notification.FLAG_AUTO_CANCEL; notif.defaults |= Notification.DEFAULT_SOUND; CharSequence from = "Notification"; CharSequence message = "See the activity!"; notif.setLatestEventInfo(context, from, message, detailsIntent); nm.notify(notifID, notif); } </code></pre>

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