How to quit android application programmatically

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I found some codes for quitting an Android application programmatically. By calling any one of the following codes in onDestroy(), will it quit application entirely?

  1. System.runFinalizersOnExit(true)
    (OR)
  2. android.os.Process.killProcess(android.os.Process.myPid());

I don’t want to run my application in background after clicking quit button.
Please inform me if I can use any one of these codes to quit my app? If so, which code can I use? Is it good way to quit the app in Android?

32 Answers
32

Since API 16 you can use the finishAffinity method, which seems to be pretty close to closing all related activities by its name and Javadoc description:

this.finishAffinity();

Finish this activity as well as all activities immediately below it in the current task that have the same affinity. This is typically used when an application can be launched on to another task (such as from an ACTION_VIEW of a content type it understands) and the user has used the up navigation to switch out of the current task and into its own task. In this case, if the user has navigated down into any other activities of the second application, all of those should be removed from the original task as part of the task switch.

Note that this finish does not allow you to deliver results to the previous activity, and an exception will be thrown if you are trying to do so.

Since API 21 you can use a very similar command

finishAndRemoveTask();

Finishes all activities in this task and removes it from the recent tasks list.

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