Prevent to create more than one Shortcut in android

private SharedPreferences appSettings;

appSettings = getSharedPreferences("com.veggies24x7.joizone", MODE_PRIVATE);
        // Make sure you only run addShortcut() once, not to create duplicate shortcuts.
        if(!appSettings.getBoolean("shortcut", false)) {
            addShortcut();
        }




private void addShortcut() {
        //Adding shortcut for MainActivity
        //on Home screen
        Intent shortcutIntent = new Intent(getApplicationContext(),
                SplashActivity.class);

        shortcutIntent.setAction(Intent.ACTION_MAIN);

        Intent addIntent = new Intent();
        addIntent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
        addIntent.putExtra(Intent.EXTRA_SHORTCUT_NAME, "Veggies24x7");
        addIntent.putExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE,
                Intent.ShortcutIconResource.fromContext(getApplicationContext(),
                        R.mipmap.ic_launcher));
        addIntent.putExtra("duplicate", false); // Just create once
        addIntent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
        getApplicationContext().sendBroadcast(addIntent);

        SharedPreferences.Editor prefEditor = appSettings.edit();
        prefEditor.putBoolean("shortcut", true);
        prefEditor.commit();
    }



Manifest Code: