Question

In my application, I used to start through Intent.ACTION_VIEW external application for viewing images/videos and so on.

For security reasons I need to close started Intent from my application. How to do that?

Answer 1

If you know which application you’re launching use

android.os.Process.killProcess(pid); 

You can get the process id from the running process using this class: RunningAppProcessInfo

You can’t get that directly, because that is a violation of security:

Why don’t you limit the choices given to the user by calling setPackage()

If you really want to know which application was launched, here is the code

ActivityManager am = (ActivityManager) context.
    getSystemService(Activity.ACTIVITY_SERVICE);
String packageName = am.getRunningTasks(1).get(0).topActivity.getPackageName();
String className = am.getRunningTasks(1).get(0).topActivity.getClassName();