[android] 네트워크 상태가 변경 될 때 마다 실시간 확인 방법. (BroadcastReceiver 사용)

네트워크가 변경되었을 때 실시간으로 앱에서 하고 싶은 동작을 할 수 있다.

[AndroidManifest.xml]
activity와 동등한 단계에 추가.

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<receiver android:name = "appNetwork">         <intent-filter>             <action android:name="android.net.conn.BACKGROUND_DATA_SETTING_CHANGED"/>         </intent-filter> </receiver>

[appNetwork.java]

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public class appNetwork extends BroadcastReceiver {     private Activity activity;          public appNetwork() {         super();     }     public appNetwork(Activity activity) {         this.activity = activity;     }     @Override     public void onReceive(Context context, Intent intent) {         String action= intent.getAction();                  if (action.equals(ConnectivityManager.CONNECTIVITY_ACTION)) {             try {                 ConnectivityManager connectivityManager =                          (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);                 NetworkInfo activeNetInfo = connectivityManager.getActiveNetworkInfo();                 NetworkInfo _wifi_network =                          connectivityManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);                 if(_wifi_network != null) {                      // wifi, 3g 둘 중 하나라도 있을 경우                      if(_wifi_network != null && activeNetInfo != null){                     }                     // wifi, 3g 둘 다 없을 경우                      else{                     }                 }             } catch (Exception e) {                 Log.i("ULNetworkReceiver", e.getMessage());             }            }     } }

[java 파일]

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IntentFilter filter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION); appNetwork receiver = new appNetwork(this); registerReceiver(receiver, filter);

참고 

http://shstarkr.tistory.com/158

http://busydeveloper.tistory.com/66