wifi setting notification (for Android)

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="daichan4649.notification"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="15"
        android:targetSdkVersion="20" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/red"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name"
            android:launchMode="singleTop">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <service android:name="WifiSettingService" />
    </application>

</manifest>

MainActivity.java

    private void showWifiSettingNotification() {
        String currentStatusText = WifiUtil.getCurrentWifiStatusText(getApplicationContext());
        NotificationUtil.showWifiSettingNotification(getApplicationContext(), currentStatusText);
    }

NotificationUtil.java

public class NotificationUtil {

    private static final int REQ_CODE_SETTING = 4649;
    private static final int NOTIFICATION_ID_WIFI = 1;

    public static void showWifiSettingNotification(Context context, String currentStatusText) {
        Intent settingIntent = new Intent(context, WifiSettingService.class);
        PendingIntent settingPI = PendingIntent.getService(context, REQ_CODE_SETTING, settingIntent,
                PendingIntent.FLAG_UPDATE_CURRENT);

        NotificationCompat.Builder builder = new Builder(context);
        builder.setSmallIcon(R.drawable.ic_launcher);
        builder.setLargeIcon(BitmapFactory.decodeResource(context.getResources(), R.drawable.ic_launcher));

        String contentTitle = "WIFI STATUS";
        builder.setContentTitle(contentTitle);

        String contentText = String.format("wifi:%s", currentStatusText);
        builder.setContentText(contentText);

        String actionText = String.format("wifi(%s)", currentStatusText);
        builder.addAction(R.drawable.ic_launcher, actionText, settingPI);

        Notification notification = builder.build();
        notification.flags |= Notification.FLAG_NO_CLEAR;

        NotificationManagerCompat nm = NotificationManagerCompat.from(context);
        nm.notify(NOTIFICATION_ID_WIFI, notification);
    }
}

WifiSettingService.java

public class WifiSettingService extends Service {

    @Override
    public IBinder onBind(Intent paramIntent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        boolean currentStatus = WifiUtil.getCurrentWifiStatus(getApplicationContext());

        // change wifi status
        WifiUtil.toggleWifiStatus(getApplicationContext());

        // update notification
        String afterStatusText = WifiUtil.getWifiStatusText(!currentStatus);
        NotificationUtil.showWifiSettingNotification(getApplicationContext(), afterStatusText);

        // toast
        String toastText = String.format("wifi: ", afterStatusText);
        Toast.makeText(getApplicationContext(), toastText, Toast.LENGTH_SHORT).show();

        // stop
        stopSelf(startId);

        return super.onStartCommand(intent, flags, startId);
    }
}

WifiUtil.java

public class WifiUtil {

    public static String getCurrentWifiStatusText(Context context) {
        boolean currentStatus = getCurrentWifiStatus(context);
        return getWifiStatusText(currentStatus);
    }

    public static String getWifiStatusText(boolean status) {
        return String.format("%s", status ? "ON" : "OFF");
    }

    public static boolean getCurrentWifiStatus(Context context) {
        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        return wifiManager.isWifiEnabled();
    }

    public static void toggleWifiStatus(Context context) {
        boolean currentStatus = getCurrentWifiStatus(context);
        WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
        wifiManager.setWifiEnabled(!currentStatus);
        // すぐには切り替わらない
    }
}