如何檢查在Android手機的網絡連接

Question

可能重複：
Android - detect whether there is an Internet connection available
How to check network connection enable or disable in WIFI and 3G(data plan) in mobile?

在我的手機，當我跑我的應用程序，然後這個應用程序崩潰，因爲網絡連接不那麼如何傳達這樣的信息，即連接不存在。或您的WIF

請幫我

謝謝

Answer 1

請參見下面的代碼。

ConnectivityManager conMgr = (ConnectivityManager) context 
      .getSystemService(Context.CONNECTIVITY_SERVICE); 
    // ARE WE CONNECTED TO THE NET 
    if (conMgr.getActiveNetworkInfo() != null 
      && conMgr.getActiveNetworkInfo().isAvailable() 
      && conMgr.getActiveNetworkInfo().isConnected()) { 
     return true; 

     // internet connection is wroking 
    } else { 
     return false; 
     // internet connection is not wroking 
    } 

Answer 2

使用此方法在你的活動，當你想知道網絡是否可用不叫這個。

public boolean isInternetOn(Context ctx) { 
    this.mContext = ctx; 
    ConnectivityManager Connect_Manager = (ConnectivityManager) mContext 
      .getSystemService(Context.CONNECTIVITY_SERVICE); 
    State connected = NetworkInfo.State.CONNECTED; 
    State connecting = NetworkInfo.State.CONNECTING; 
    State disconnected = NetworkInfo.State.DISCONNECTED; 

    State info0 = Connect_Manager.getNetworkInfo(0).getState(); 
    State info1 = Connect_Manager.getNetworkInfo(1).getState(); 

    // ARE WE CONNECTED TO THE NET 
    if (info0 == connected || info0 == connecting || info1 == connecting 
      || info1 == connected) { 

     // MESSAGE TO SCREEN FOR TESTING (IF REQ) 
     // Toast.makeText(this, connectionType + " connected", 
     // Toast.LENGTH_SHORT).show(); 
     Log.d("Internet", "Connected"); 
     return true; 
    } else if (info0 == disconnected || info1 == disconnected) { 
     Log.d("Internet", "DisConnected"); 
     // System.out.println("Not Connected"); 
     return false; 
    } 
    return false; 
} 

現在檢查互聯網Conncetion，

if (isInternetOn(this)) 
    { 

     //Do stuff   
     } 
else 
     { 

      //show alert 
     }