CODEWITHSUNDEEP
androidandroid-activity
Michael Meyer
Michael Meyer

Reputation: 2184

How to set no History for all Activities

My Android Application is based on four Activities. The last activity starts an Intent Service and set itself to background.

Before I sent the last Activity to background I would like to remove all four Activities from backstack history

I tried already to set the no history = true attribute for the activities. This causes errors when I use startActivityForResult, so I need a different solution

Upvotes: 0

Views: 1034

Answers (2)

Marcin Kunert
Marcin Kunert

Reputation: 6295

I don't really think there is an "good" way to do this, I would try something like this:

First create a SelfClosingActivity which only job is to close itself after opening:

public void onCreate(Bundle savedInstanceState()) {
    super.onCreate(savedInstanceState);
    finish();
}

When you want to close all the Activities (after you start your IntentService I guess) run the SelfClosingActivity and add flags to clear the current stack.

Intent intent = new Intent(this, SelfClosingActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(intent);

This will clear the current stack before opening SelfClosingActivity and SelfClosingActivity will close itself leaving the stack completely empty.

Upvotes: 1

ugur
ugur

Reputation: 3654

FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_NEW_TASK will do what you want.

FLAG_ACTIVITY_CLEAR_TOP

Added in API level 1 int 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.

For example, consider a task consisting of the activities: A, B, C, D. If D calls startActivity() with an Intent that resolves to the component of activity B, then C and D will be finished and B receive the given Intent, resulting in the stack now being: A, B.

This launch mode can also be used to good effect in conjunction with FLAG_ACTIVITY_NEW_TASK: if used to start the root activity of a task, it will bring any currently running instance of that task to the foreground, and then clear it to its root state. This is especially useful, for example, when launching an activity from the notification manager.

Refer to Tasks and Back Stack for more info

Upvotes: 0

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