title: How to make a service to check wifi state?
body: <p>I am trying to make an app to lunch my main activity when wifi turns on. I found I should use a service to perform it. I found this code but does not work.</p>
  
  <pre><code>import android.app.IntentService;
  import android.content.Context;
  import android.content.Intent;
  import android.net.ConnectivityManager;
  import android.net.wifi.WifiManager;
  import android.widget.Toast;
  
  public class MyServer extends IntentService {
      public Boolean has_launched = false;
      public MyServer() {
          super("MyServer");
      }
  
      @Override
      public void onCreate() {
          super.onCreate();
          Toast.makeText(MyServer.this, "service started", Toast.LENGTH_SHORT).show();
      }
  
      @Override
      protected void onHandleIntent(Intent intent) {
          wificheck();
      }
  
      @Override
      public int onStartCommand(Intent intent, int flags, int startId) {
          return android.app.Service.START_STICKY;
      }
  
      @Override
      public void onDestroy() {
          super.onDestroy();
          Toast.makeText(MyServer.this, "service stoped!", Toast.LENGTH_SHORT).show();
      }
  
      public void wificheck() {
          WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
          if (wifi.isWifiEnabled() &amp;&amp; has_launched == false) {
              has_launched = true;
              //startActivity(new Intent(MyServer.this, MainActivity.class));
              Toast.makeText(MyServer.this, "Wifi is on!", Toast.LENGTH_SHORT).show();
          }
          else if (wifi.isWifiEnabled() == false) {
              has_launched = false;
          }
      }
  }
  </code></pre>
  
  <p>I have permission to read wifi state and the app lunch normally(without an error)
  It does not lunch wificheck. what should I do?</p>