使用Context.CONNECTIVITY_SERVICE检查互联网连接

问题描述：

我用这code来检查网络连接：

I am using this code to check for the internet connection:

private boolean checkInternetConnection() {
    ConnectivityManager cm = (ConnectivityManager)
                              getSystemService(Context.CONNECTIVITY_SERVICE);
    // test for connection
    if (cm.getActiveNetworkInfo() != null
            && cm.getActiveNetworkInfo().isAvailable()
            && cm.getActiveNetworkInfo().isConnected()) {
        return true;
    } else {
        return false;
    }
}

但即使当我关闭了WiFi它仍然返回true。

but even when I turn off the wifi it still returns true.

在仿真器和设备具有相同的结果都尝试？
什么是错的？

Tried both on emulator and device with same result?
What is wrong ?

答

这个简单的code工作在我的情况：

This simple code works in my case:

public boolean netConnect(Context ctx)
{
    ConnectivityManager cm;
    NetworkInfo info = null;
    try
    {
        cm = (ConnectivityManager) 
              ctx.getSystemService(Context.CONNECTIVITY_SERVICE);
        info = cm.getActiveNetworkInfo();
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    if (info != null)
    {
        return true;
    }
    else
    {
        return false;
    }
}

另外这一个。

Also this one..

public boolean isOnline() {
    ConnectivityManager cm = (ConnectivityManager)
                              getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo netInfo = cm.getActiveNetworkInfo();
    if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        return true;
    }
    return false;
}

使用Context.CONNECTIVITY_SERVICE检查互联网连接

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