How Get a list of current running APP in Android

Question

I want to use the ActivityManager to get a list of current APPs and return the newest process` name to the system clipboard.Just like this

 protected void onStart() {
        super.onStart();
        Amanager=(ActivityManager)this.getSystemService(ACTIVITY_SERVICE);
        ActivityManager.RunningAppProcessInfo App=null;
        List<ActivityManager.RunningAppProcessInfo> RunningTasks;
        try {
            RunningTasks = Amanager.getRunningAppProcesses();
            App = RunningTasks.get(0);
        }catch (final Exception e){Log.d(TAG, "List ERROR");}
        if(App!=null) {
            String result =App.processName;
            contentText.setText(result);;
            Clipboard.setText(result);
        }else {
            Log.d(TAG, "COMPONENT ERROR");
        }
    }

But when running at the Simulator, some errors occured:

java.lang.RuntimeException: Unable to start activity ComponentInfo{//the absolute address}:

Possible duplicate of [What is a NullPointerException, and how do I fix it?](http://stackoverflow.com/questions/218384/what-is-a-nullpointerexception-and-how-do-i-fix-it) — Janki Gadhiya, Jun 29 '16 at 11:29

score 2 · Accepted Answer · answered Jun 29 '16 at 11:28

2

Try this

ActivityManager actvityManager = (ActivityManager)
this.getSystemService( ACTIVITY_SERVICE );
List<RunningAppProcessInfo> procInfos = actvityManager.getRunningAppProcesses();

for(int i = 0; i < procInfos.size(); i++)
 {
   Log.i("App-Package","" + procInfos.get(i).processName);
}

This may helps you

answered Jun 29 '16 at 11:28

Sathish Kumar J

4,280
1
20
48

So the newest one may be the proInfos.get(0)? – Arics Lee Jun 29 '16 at 11:33

score 2 · Answer 2 · answered Jun 29 '16 at 11:32

2

You code is perfectly fine. You are getting this exception because your contentText is null. Make sure you're referencing it correctly.

answered Jun 29 '16 at 11:32

Talha Mir

1,228
11
19

How Get a list of current running APP in Android

2 Answers2