Why does FLAG_ACTIVITY_CLEAR_TOP not work?
android, android-activity, android-intent
Solution
From the documentation for FLAG_ACTIVITY_CLEAR_TOP:
If set, and the activity being launched is already running in the current task, then instead of launching a new instance of that activity, all of the other activities on top of it will be closed and this Intent will be delivered to the (now on top) old activity as a new Intent.
As you added in your comment, the activity A has been finished before calling B, so this situation doesn't apply. A new instance of activity A will be launched instead.
As I see it, you have two options here:
1) Use the `Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK` flags. This will start activity A as the root of the stack. It works, but any other activities in the stack will be lost. Assuming A was the first activity (or at least, that you are not interested in any previous activities in the task stack) then it doesn't matter. Note: CLEAR_TASK requires API Level 11.
2) Another possible solution (in case the previous assumption is not true) would be to not use intent flags at all:
- B starts C with `startActivityForResult()`.
- Instead of calling A, C finishes, having set a result for B indicating that A must be launched.
- In `B.afterActivityResult()`, finish B and launch A.
Problem
As the title says, Why `intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)` or `intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)` won't work? I have 3 Activities let us say A, B and C. When I am trying to launch Activity A from C with code: ``` Intent i = new Intent(this, A.class); i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); startActivity(i); ``` It simply starts Activity A but doesn't clear the top.! -_- I have also tried using `setFlags()`. I read different questions on SO about this problem, but I couldn't find the right answer. >_< Somebody please help! Edit Code for onBackPressed() in activity 'A' as requested by @codeMagic. ``` @Override public void onBackPressed(){ if(wvLogin.canGoBack()) wvLogin.goBack(); else super.onBackPressed(); } ```