Android ...如何查明我是否在无线网络上？

Question

在我的应用程序中,我只需要知道设备是否连接到wifi网络.我认为这个功能适用于模拟器,但不适用于真实设备.

public static boolean wifiInternet(Context c)
{
    try
    {
        ConnectivityManager connectivityManager = (ConnectivityManager)c.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo ni = connectivityManager.getActiveNetworkInfo();  // CRASHES HERE
        String name = ni.getTypeName(); 
        if(name.equals("WIFI"))
            return true;
        else
            return false;
    }
    catch(Exception e)
    {
        return false;
    }
}

我在这里使用哪种上下文？getAplicationContext()或getBaseContext()或者我只是把'this'(我从服务中调用函数).

Answer 1

试试这个:

  public boolean isUsingWiFi() {
    ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo wifiInfo = connectivity
            .getNetworkInfo(ConnectivityManager.TYPE_WIFI);

    if (wifiInfo != null && wifiInfo.getState() == NetworkInfo.State.CONNECTED
            || wifiInfo.getState() == NetworkInfo.State.CONNECTING) {
        return true;
    }

    return false;
}

您也可以使用相同的移动类型:

  public boolean isUsingMobileData() {
    ConnectivityManager connectivity = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo mobileInfo = connectivity
            .getNetworkInfo(ConnectivityManager.TYPE_MOBILE);

    if (mobileInfo != null && mobileInfo.getState() == NetworkInfo.State.CONNECTED
            || mobileInfo.getState() == NetworkInfo.State.CONNECTING) {
        return true;
    }

    return false;
}