WifiReceiver.java

// // Copyright 2015 Google Inc. All Rights Reserved. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // http://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. package com.google.example.wificonnected; import android.app.Notification; import android.app.NotificationManager; import android.app.Service; import android.content.BroadcastReceiver; import android.content.Context; import android.content.Intent; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.os.Handler; import android.os.IBinder; import android.support.v4.app.NotificationCompat; import android.util.Log; /** * Receives wifi changes and creates a notification when wifi connects to a network, * displaying the SSID and MAC address. * * Put the following in your manifest * * <receiver android:name=".WifiReceiver" android:exported="false" > * <intent-filter> * <action android:name="android.net.wifi.WIFI_STATE_CHANGED" /> * </intent-filter> * </receiver> * <service android:name=".WifiReceiver$WifiActiveService" android:exported="false" /> * * To activate logging use: adb shell setprop log.tag.WifiReceiver VERBOSE */ public class WifiReceiver extends BroadcastReceiver { private final static String TAG = WifiReceiver.class.getSimpleName(); @Override public void onReceive(final Context context, final Intent intent) { int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, -1); if (WifiManager.WIFI_STATE_CHANGED_ACTION.equals(intent.getAction()) && WifiManager.WIFI_STATE_ENABLED == wifiState) { if (Log.isLoggable(TAG, Log.VERBOSE)) { Log.v(TAG, "Wifi is now enabled"); } context.startService(new Intent(context, WifiActiveService.class)); } } /** * Getting the network info and displaying the notification is handled in a service * as we need to delay fetching the SSID name. If this is done when the receiver is * called, the name isn't yet available and you'll get null. * * As the broadcast receiver is flagged for termination as soon as onReceive() completes, * there's a chance that it will be killed before the handler has had time to finish. Placing * it in a service lets us control the lifetime. */ public static class WifiActiveService extends Service { private final static String TAG = WifiActiveService.class.getSimpleName(); @Override public int onStartCommand(Intent intent, int flags, int startId) { final WifiManager wifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); // Need to wait a bit for the SSID to get picked up; // if done immediately all we'll get is null new Handler().postDelayed(new Runnable() { @Override public void run() { WifiInfo info = wifiManager.getConnectionInfo(); String mac = info.getMacAddress(); String ssid = info.getSSID(); if (Log.isLoggable(TAG, Log.VERBOSE)) { Log.v(TAG, "The SSID & MAC are " + ssid + " " + mac); } createNotification(ssid, mac); stopSelf(); } }, 5000); return START_NOT_STICKY; } @Override public IBinder onBind(Intent intent) { return null; } /** * Creates a notification displaying the SSID & MAC addr */ private void createNotification(String ssid, String mac) { Notification n = new NotificationCompat.Builder(this) .setContentTitle("Wifi Connection") .setContentText("Connected to " + ssid) .setStyle(new NotificationCompat.BigTextStyle() .bigText("You're connected to " + ssid + " at " + mac)) .setSmallIcon(R.mipmap.ic_launcher) .build(); ((NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE)) .notify(0, n); } } }