Question

I want to kill all running applications in android. so for this task, I’ve implemented the following code. But it is not working. The app still remains running.

ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
    for (RunningAppProcessInfo service : manager.getRunningAppProcesses()) {
    Log.i("process name " , service.processName);
    
    android.os.Process.killProcess(service.pid);
    }

So where did I make a mistake in the code?

Answer 1

• You can use Process.killProcess(int pid) to kill processes that have the same UID with your App.
• You can use ActivityManager.killBackgroundProcesses(String packageName),with KILL_BACKGROUND_PROCESSES permission in your manifest(for API >= 8) or ActivityManager.restartPackage (String packageName)(for API < 8) to kill specified process,except of forground process.

So if you would to kill all other processes when your program is foreground process,you would to use ActivityManager.killBackgroundProcesses or ActivityManager.restartPackage:

List<ApplicationInfo> packages;
    PackageManager pm;
    pm = getPackageManager();
    //get a list of installed apps.
    packages = pm.getInstalledApplications(0);

   ActivityManager mActivityManager = (ActivityManager)context.getSystemService(Context.ACTIVITY_SERVICE);
   String myPackage = getApplicationContext().getPackageName();
   for (ApplicationInfo packageInfo : packages) {
        if((packageInfo.flags & ApplicationInfo.FLAG_SYSTEM)==1)continue;
        if(packageInfo.packageName.equals(myPackage)) continue;
        mActivityManager.killBackgroundProcesses(packageInfo.packageName);
   }      

In above snippet code,each process will be killed unless it be process of your App or system process.
References:
How to close all active applications from my Android app?
How do task killers work?