tuer processus en arriere plan killBackgroundProcesses

Bonjour,
Je n'arrive pas a tuer les processus en fond :
Manifest :

Code:

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<uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES"></uses-permission>

code :

Code:

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ActivityManager am = (ActivityManager)this.getSystemService(ACTIVITY_SERVICE);
 
	        List l = am.getRunningAppProcesses();
 
	        Iterator i = l.iterator();
	        PackageManager pm = this.getPackageManager();
	        String valeur ="";
	        while(i.hasNext()) {
	          ActivityManager.RunningAppProcessInfo info = (ActivityManager.RunningAppProcessInfo)(i.next());
 
	          try {
	            CharSequence c = pm.getApplicationLabel(pm.getApplicationInfo(info.processName, PackageManager.GET_META_DATA));
	            Log.w("LABEL", c.toString());
 
	            if (c.toString().equals("test")){
	            	valeur="passage";
 
	            	 ActivityManager activityManager = (ActivityManager)this.getSystemService(Context.ACTIVITY_SERVICE);
	            	    activityManager.killBackgroundProcesses("kill.test.com");
 
	            }else{
	            	if (valeur !="passage"){
	            		valeur="ok";
	            	}
 
 
 
	            }
	          }catch(Exception e) {
		            //Name Not FOund Exception
		          }
	        }

L'idée est de vérifier si mon application est en premier plan si elle ne l'est pas je la kill.