public void openApp(String packageName, Context context) {

         PackageManager packageManager = context.getPackageManager();

         Intent resolveIntent = new Intent(Intent.ACTION_MAIN, null);

         resolveIntent.addCategory(Intent.CATEGORY_LAUNCHER);

         resolveIntent.setPackage(packageName);

         List<ResolveInfo> apps = packageManager.queryIntentActivities(

                 resolveIntent, 0);

         ResolveInfo ri = apps.iterator().next();

         if (ri != null) {

             String className = ri.activityInfo.name;

             Intent intent = new Intent(Intent.ACTION_MAIN);

             intent.addCategory(Intent.CATEGORY_LAUNCHER);

             intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

             ComponentName cn = new ComponentName(packageName, className);

             intent.setComponent(cn);

             context.startActivity(intent);

         }

     }