Android自動檢查互聯網連接

Question

Hello world如何隨時檢測我是否自動連接或斷開Internet連接。 示例：當我連接並關閉3G或wifi時，吐司表示我斷開連接，在激活3G或wifi 3秒後，吐司告訴我我已連接。

我使用這種方法，但它告訴我應用程序啓動時的連接狀態，但不在應用程序導航過程中。

ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); 

//For 3G check 
    boolean is3g = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE) 
      .isConnectedOrConnecting(); 
//For WiFi Check 
    boolean isWifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI) 
      .isConnectedOrConnecting(); 


    if (!is3g && !isWifi) 
    { 
     Toast.makeText(getApplicationContext(),"Network Connection is OFF", Toast.LENGTH_LONG).show(); 
    } 
    else 
    { 
     Toast.makeText(getApplicationContext(),"Network Connection is ON", Toast.LENGTH_LONG).show(); 

    } 

幫助我，請

Answer 1

您可以使用utility類和BroadcastReceiver用於這一目的。下面的鏈接顯示了一步程序顯示一步

http://viralpatel.net/blogs/android-internet-connection-status-network-change/

Answer 2

你可以使用Timer的時間表運行一個線程。注意最後的3000這將使它每3秒運行一次。

Timer timer = new Timer(); 
timer.schedule(new TimerTask() 
{ 
    @Override 
    public void run() 
    { 
     ConnectivityManager manager = (ConnectivityManager) getSystemService(CONNECTIVITY_SERVICE); 

     //For 3G check 
     boolean is3g = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE) 
      .isConnectedOrConnecting(); 
     //For WiFi Check 
     boolean isWifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI) 
      .isConnectedOrConnecting(); 


     if (!is3g && !isWifi) 
     { 
      Toast.makeText(getApplicationContext(),"Network Connection is OFF", Toast.LENGTH_LONG).show(); 
     } 
     else 
     { 
      Toast.makeText(getApplicationContext(),"Network Connection is ON", Toast.LENGTH_LONG).show(); 

     } 
    } 
}, 0, 3000); 

Answer 3

答案是BroadcastReceiver！ 你得到通知，每次你從WIFI/3G/ON/OFF ..

看吧network connectivity變化：http://developer.android.com/training/monitoring-device-state/connectivity-monitoring.html

在這裏：http://www.grokkingandroid.com/android-getting-notified-of-connectivity-changes/

Answer 4

你可以簡單地在任何地方使用這種方法，你喜歡:)

public static boolean isDeviceOnline(Context context) { 

    ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE); 
    NetworkInfo networkInfo = connMgr.getActiveNetworkInfo(); 
    boolean isOnline = (networkInfo != null && networkInfo.isConnected()); 
    if(!isOnline) 
     Toast.makeText(context, " No internet Connection ", Toast.LENGTH_SHORT).show(); 

    return isOnline; 
} 

裏面你的活動中使用此代碼：

activity=this; 
if(isDeviceOnline(activity)) 
{ 
//you are online 
} 
else 
{ 
//you are offline 
}