Question

我正在尝试检查互联网状态。当我启用互联网，然后我运行这个应用程序，它显示＆＃34;互联网连接＆＃34;。当我停止互联网然后再次运行此应用程序时，它将显示＆＃34;未连接到互联网＆＃34;。但是，当我在模拟器中运行此应用程序时，它始终显示Internet连接。请告诉我问题是什么。

//check Internet connection.
private boolean checkInternetConnection() {
    ConnectivityManager check = (ConnectivityManager) this.context.getSystemService(Context.CONNECTIVITY_SERVICE);
    if (check != null) {
        NetworkInfo[] info = check.getAllNetworkInfo();
        if (info != null)  
            for (int i = 0; i <info.length; i++) 
                if (info[i].getState() == NetworkInfo.State.CONNECTED) {
                    Toast.makeText(context, "Internet is connected", Toast.LENGTH_SHORT).show();
                }
             return true;
    } else {
        Toast.makeText(context, "not connected to internet", Toast.LENGTH_SHORT).show();
        return false;
    }

}

Answer 1

我猜问题就在于

NetworkInfo[] info = check.getAllNetworkInfo();

您只能获得有效的网络信息您可以尝试以下方法，我测试它就像一个魅力：

public boolean isNetworkUp() {
    ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
    if (activeNetwork != null && activeNetwork.isConnectedOrConnecting()) {
        if (activeNetwork.getType() == ConnectivityManager.TYPE_WIFI) {
            return true;
        }
    }
    return false;
}

Answer 2

你可以尝试这种方法.......

private boolean isNetConnected（）{

ConnectivityManager cm =  (ConnectivityManager)getSystemService(Context.CONNECTIVITY_SERVICE);

                NetworkInfo ni = cm.getActiveNetworkInfo();

                if(ni != null && ni.isConnectedOrConnecting()){
                    return true;
                }
                return false;

}

Answer 3

您好使用以下代码..

/**
 * Checks if is connection.
 * 
 * @param con
 *            the con
 * @return true, if is connection
 */
public static boolean isConnection(Context con) {
    ConnectivityManager conMgr = (ConnectivityManager) con
            .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (conMgr.getActiveNetworkInfo() != null
            && conMgr.getActiveNetworkInfo().isAvailable()
            && conMgr.getActiveNetworkInfo().isConnected()) {
        return true;
    } else {
        return false;
    }
}

让我知道您的反馈意见。

Answer 4

You can also use F8 to set the cell network on/off. 
Check this link
http://developer.android.com/tools/help/emulator.html

Answer 5

这将是您的问题的解决方案。

public boolean isNetworkAvailable() {
            ConnectivityManager connectivityManager 
                  = (ConnectivityManager) ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
            if (activeNetworkInfo != null && activeNetworkInfo.isConnected()){ 
            return true;
            }else {
                return false;
            }
        }

如何检查Android中的互联网连接？

5 个答案: