Close application and remove from recent apps/

Question

I know this question is common and asked many times on Stack Overflow, but after visiting nearly the four pages of search engine results and nearly the 20 question of Stack Overflow regarding this issue, I found that none of them is resolved or answered correctly.

What I want:

I want to show my app in recent apps list when it is running but when I close app then my process should be killed and application should be removed from recent apps list.

Some answers I found:

use System.exit(0); //doesn't clear app from recents
OR
use android.os.Process.killProcess(android.os.Process.myPid()); //doesn't clear app from recents
OR
use finish() or this.finish() or Activity.finish();// doesn't clear app from recents

And one common suggestion I see in every answer that add below code in manifest:

android:excludeFromRecents //I think this is wrong approach.

because after adding this when user presses home button while my app is running then user cannot see my app in recent Apps List.

And many other suggestions on this but none of them do both tasks close application and clear application from recent apps list. Also if you go in Settings>Apps>yourApp>your Application see that still it asks for "force stop" means application is running!

Answer 1

I based my solution on guest's above, as well as gilsaints88's comments below (for Android L compatibility):

Add this activity to your AndroidManifest.xml file:

<activity
    android:name="com.example.ExitActivity"
    android:theme="@android:style/Theme.NoDisplay"
    android:autoRemoveFromRecents="true"/>

Then create a class ExitActivity.java:

public class ExitActivity extends Activity
{
    @Override protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);

        if(android.os.Build.VERSION.SDK_INT >= 21)
        {
            finishAndRemoveTask();
        }
        else
        {
            finish();
        }
    }

    public static void exitApplication(Context context)
    {
        Intent intent = new Intent(context, ExitActivity.class);

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_NO_ANIMATION | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);

        context.startActivity(intent);
    }
}

Then whenever you want to force close your application and remove it from the recent's list, call:

ExitActivity.exitApplication(context);

This solution works for me instead of declaring android:excludeFromRecents="true" because I want the user to be able to see the app in the recents list UNTIL the point where my app triggers closing the app programmatically.

Answer 2

Before I present my attempt at this, I want to make it clear that what follows won't address the availability of "force stop" in the application info. Android allows you to force stop an application even if it does not have any processes running. Force stop puts the package into a specific stopped state, where it can't receive broadcast events.

Now that that's out of the way, on with my cheesy idea for this. The gist of it is to replace the task that you want to exit with one that the system will exclude from the recent apps list.

1. Define an activity (I'll call it Exiter) that just finishes itself immediately.
   • Call finish() in onCreate(Bundle).
   • From the question, it sounds like the OP will also want to call System.exit(int) too. But for other people reading this answer, you usually don't have to kill the process.
   • Use android:theme="@android:style/Theme.NoDisplay" to prevent this from causing a bunch of redundant transitions.
2. Set android:taskAffinity so that Exiter will run in the task that you want to exit. Or don't: by default, unspecified taskAffinity makes it so that all activities share a common anonymous taskAffinity.
3. When you want to exit, use startActivity(Intent) to start Exiter with the following flags:
   • Intent.FLAG_ACTIVITY_NEW_TASK - Even though we want to start the activity in the same task, the other flags require this flag. Fortunately, the taskAffinity will prevent the system from actually starting a new task.
   • Intent.FLAG_ACTIVITY_CLEAR_TASK - This finishes all the activities on the task. You won't have to call finish() everywhere, just in Exiter.
   • Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS - The task won't be in the recent apps list. Since it's the same task as the one that's exiting, this flag removes the task from the list.

https://gist.github.com/anonymous/9884978

Answer 3

Add this to your Activity:

@Override
public void finish() {
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        super.finishAndRemoveTask();
    }
    else {
        super.finish();
    }
}

---

finishAndRemoveTask()

Call this when your activity is done and should be closed and the task should be completely removed as a part of finishing the root activity of the task.

Answer 4

finishAndRemoveTask(); worked for me to remove an app from taskbar. After closing app.

Answer 5

The solution for Kotlin.

ExitHelper.kt

fun Activity.finishAndRemoveTaskCompat() {
    if (android.os.Build.VERSION.SDK_INT >= 21) {
        finishAndRemoveTask()
    } else {
        val intent = Intent(this, ExitAndRemoveFromRecentAppsDummyActivity::class.java)

        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK or
                Intent.FLAG_ACTIVITY_CLEAR_TASK or
                Intent.FLAG_ACTIVITY_NO_ANIMATION or
                Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)

        startActivity(intent)
    }
}

class ExitAndRemoveFromRecentAppsDummyActivity : Activity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        finish()
    }
}

AndroidManifest.xml

<activity
     android:name=".ExitAndRemoveFromRecentAppsDummyActivity"
     android:theme="@android:style/Theme.NoDisplay"
/>

Then just use it as a usual method in your Activity:

override fun boo() {
    foo()
    finishAndRemoveTaskCompat()
}