SleepTimer: Stop Services attempt without root [failed]

gistfile1.java

Class c = Class.forName("android.app.ActivityManagerNative");
Method getDefaultMethod = c.getMethod("getDefault");
getDefaultMethod.setAccessible(true);
Object nativeManager = getDefaultMethod.invoke(null);
c = nativeManager.getClass();
Method forceStopPackageMethod = c.getMethod("forceStopPackage", String.class);
forceStopPackageMethod.setAccessible(true);
forceStopPackageMethod.invoke(nativeManager, pkgName);