Android - Broadcast Receiver protokolliert keine Nachrichten

Question

Ich habe eine service, die eine Broadcast Receiver enthält, die nach Wi-Fi-Statusänderung sucht und einen Toast macht, wenn sie aktiviert oder deaktiviert ist. Aber mein Code tost nicht auf die Wi-Fi-Statusänderungsnachrichten, obwohl er die Nachrichten in Bezug auf Dienst erstellen, starten und zerstören anruft.

WLANService.java

public class WLANService extends Service { 
    public WLANService() { 
    } 

    @Override 
    public IBinder onBind(Intent intent) { 
     throw new UnsupportedOperationException("Not yet implemented"); 
    } 

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     Toast.makeText(this, "Service Created!", Toast.LENGTH_LONG).show(); 
    } 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 

     int state = 0; 
     String message = intent.getStringExtra("message"); 
     Toast.makeText(this, "Service Started & " + message, Toast.LENGTH_LONG).show(); 

     BroadcastReceiver broadcastReceiver = new BroadcastReceiver() { 
      @Override 
      public void onReceive(Context context, Intent intent) { 
       WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE); 
       if(wifiManager.isWifiEnabled()) { 
        Log.i("Wi-Fi-State", "Wi-Fi is On!"); 
       }else { 
        Log.i("Wi-Fi-State", "Wi-Fi is Off!"); 
       } 
      } 
     }; 
     return START_STICKY; 
    } 

    @Override 
    public void onDestroy() { 
     Toast.makeText(this, "Service Destroyed!", Toast.LENGTH_LONG).show(); 
    } 
} 

MainActivity.java

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
    } 

    public void startTheService(View v) { 
     Intent intent = new Intent(this, WLANService.class); 
     intent.putExtra("message", "I got your message!"); 
     startService(intent); 
    } 

    public void stopTheService(View v) { 
     stopService(new Intent(this, WLANService.class)); 
    } 
} 

AndroidManifest.xml

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

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

    <application 
     android:allowBackup="true" 
     android:icon="@mipmap/ic_launcher" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme"> 
     <activity android:name=".MainActivity"> 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <service 
      android:name=".WLANService" 
      android:enabled="true" 
      android:exported="false"> 
     </service> 
    </application> 

</manifest> 

Answer 1

Man könnte so etwas tun:

public class WLANService extends Service { 
    private final BroadcastReceiver receiver = new BroadcastReceiver() { 
     @Override 
     public void onReceive(Context context, Intent intent) { 
      NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO); 
      boolean connected = info.isConnected(); 
      if(connected) { 
       Toast.makeText(context, "WIFI CONNECTED!", Toast.LENGTH_LONG).show(); 
       Log.i("Wi-Fi-State", "Wi-Fi is On!"); 
      } else { 
       Toast.makeText(context, "WIFI DISCONNECTED!", Toast.LENGTH_LONG).show(); 
       Log.i("Wi-Fi-State", "Wi-Fi is Off!"); 
      } 
     } 
    } 

    public WLANService() { 
    } 

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

    @Override 
    public void onCreate() { 
     super.onCreate(); 
     Toast.makeText(this, "Service Created!", Toast.LENGTH_LONG).show(); 
    } 

    @Override 
    public int onStartCommand(Intent intent, int flags, int startId) { 
     // registering your receiver 
     registerReceiver(receiver, new IntentFilter(WifiManager.NETWORK_STATE_CHANGED_ACTION)); 
     return START_STICKY; 
    } 
} 

MainActivity:

public class MainActivity extends AppCompatActivity { 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     // starting your Service 
     startTheService(); 
    } 

    public void startTheService() { 
     Intent intent = new Intent(this, WLANService.class); 
     intent.putExtra("message", "I got your message!"); 
     startService(intent); 
    } 
}