Wifi getSSID() 返回 null [英] Wifi getSSID() returns null

问题描述

我使用 getSSID() 在建立新连接后立即获取 wifi 网络的名称.但有时我会为该值获取空值.这是我的代码:

I use getSSID() to get the name of the wifi network as soon as a new connection is made. But sometimes I get null for that value. This is my code:

清单中的权限是正确的，因为正如我所说，它在大多数情况下都有效.

Permissions in manifest are correct, because, as I said, most of the times it works.

我将此过滤器用于广播接收器:

I use this filter for the broadcast receiver:

<action android:name="android.net.wifi.supplicant.CONNECTION_CHANGE" />

在广播中我这样做:

if("android.net.wifi.supplicant.CONNECTION_CHANGE".equals(intent.getAction()))
{  boolean bConected = intent.getBooleanExtra(WifiManager.EXTRA_SUPPLICANT_CONNECTED, false);
   if(bConnected == true)
   {  WifiManager wifi = (WifiManager) Contexto.getSystemService(Context.WIFI_SERVICE);
      String MyName = wifi.getConnectionInfo().getSSID();
      Sometimes MyName is null here even if Wifi is connected correctly
   }
}

有什么想法吗?

推荐答案

我经常使用类似的代码，但我从来没有在连接时收到null.

I use similar code regularly and I have never received null when connected.

这是我的代码:

WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifi.getConnectionInfo();
String myName = info.getSSID();

因此，我建议您在收到CONNECTION_CHANGE广播后等待400到1000ms左右，然后再请求信息.

Therefore, I propose that you should wait 400 to 1000ms or so after receipt of the CONNECTION_CHANGE broadcast before requesting the information.

这是一个实现延迟的示例:

Here is one example that will implement the delay:

final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() {
        WifiManager wifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);
        WifiInfo info = wifi.getConnectionInfo();
        String myName = info.getSSID();
    }
}, 1000);

这篇关于Wifi getSSID() 返回 null的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！