在整個應用程序中全局廣播和接收連接更改的最佳做法是什麼？

Question

我有正在觀看數據連接更改這個簡單的廣播接收機：

public class NetworkChangeReceiver extends BroadcastReceiver { 

    private Context mContext; 
    private Boolean mIsConnectedToInternet; 
    private enum AlarmTypes {ALARM_TYPE_REPEATED, ALARM_TYPE_UNIQUE} 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     try { 
      this.mContext = context; 
      Logger.d("Connection changed!!!"); 
      triggerActionBasedOnTheConnectionType(isConnectedToInternet()); 
     } catch (Exception e) { 
      Logger.e("onReceive method cannot be processed"); 
      e.printStackTrace(); 
     } 
    } 

    public boolean isConnectedToInternet() { 
     mIsConnectedToInternet = false; 
     try { 
      ConnectivityManager cm = 
        (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE); 

      NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); 
      mIsConnectedToInternet = activeNetwork != null && 
        activeNetwork.isConnectedOrConnecting(); 

     } catch (Exception e) { 
      Logger.e("onReceive method cannot be processed"); 
      e.printStackTrace(); 
     } 
     return mIsConnectedToInternet; 
    } 


    public void triggerActionBasedOnTheConnectionType(Boolean mIsConnectedToInternet) { 
     try{ 
      if(mIsConnectedToInternet == true) { 
       Logger.d("Device is connected"); 
      } 
      if(mIsConnectedToInternet == false) { 
       Logger.d("Device is not connected"); 

      } 
     } catch(Exception e) { 
      Logger.e("triggerActionBasedOnTheConnectionType method cannot be processed"); 
     } 

    } 
} 

我想如果該設備是離線在所有視圖和全球停用所有按鈕來顯示操作欄下的一些通知欄與一些類。

我該如何以正確的方式做到這一點？有這樣的圖書館嗎？

非常感謝您的任何建議。

Answer 1

它是一種簡單的連接改變廣播接收器

1. 註冊的廣播接收器在你的AndroidManifest.xml 文件

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

還定義權限來訪問網絡狀態，並有互聯網

<uses-permission android:name="android.permission.INTERNET"/> 
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 

接下來，創建NetworkChangeBR.java文件，用下面的內容

@Override 
public void onReceive(final Context context, Intent intent) { 
    int status = getConnectivityStatus(context); 
    if(status==0){ 
    // Offline 
    // Display notification 
    // Deactivate buttons 
    }else{ 
    // Connected 
    // Also you can check for status==ConnectivityManager.TYPE_WIFI or status==ConnectivityManager.TYPE_MOBILE 
    } 

} 

其中getConnectivityStatus函數被定義爲

// Method to get status of network 
private int getConnectivityStatus(Context context) { 
    ConnectivityManager cm = (ConnectivityManager) context 
      .getSystemService(Context.CONNECTIVITY_SERVICE); 

    NetworkInfo activeNetwork = cm.getActiveNetworkInfo(); 
    if (activeNetwork != null && activeNetwork.isConnected()) { 
     if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI || activeNetwork.getType() == ConnectivityManager.TYPE_WIMAX) { 
      Log.d(LOGTAG, "Wifi"); 
      return ConnectivityManager.TYPE_WIFI; 
     } 
     if (activeNetwork.getType() == ConnectivityManager.TYPE_MOBILE) { 
      Log.d(LOGTAG, "MOBILE"); 
      return ConnectivityManager.TYPE_MOBILE; 
     } 
    } 
    Log.d(LOGTAG, "Not Connected"); 
    return 0; 
}