如何知道打开了哪个应用程序？

Question

I want to know when any app is opened. Clearly to say, i am making service that blocks some apps ( according to user ) and i want to check app is this similar to any app in the blocklist and abort that app process. And does it need root access?

Answer 1

You are able to know which apps are currently opened

ActivityManager manager = 
    (ActivityManager) this.getSystemService(ACTIVITY_SERVICE);
List<RunningAppProcessInfo> processes = manager.getRunningAppProcesses();

Now from the processes find your app and write the logic as per your requirement.

Answer 2

Use this code

ActivityManager activityManager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
List<RunningTaskInfo> runtasks = activityManager.getRunningTasks(Integer.MAX_VALUE);
for (int i = 0; i < runtasks.size(); i++) {
Log.d("Running task", "Running task: " + runtasks.get(i).baseActivity.toShortString() + "\t\t ID: " + runtasks.get(i).id);
}