java - Android WiFi 状态未知

Question

当我尝试返回 wifi 状态、断开连接或连接时，我遇到了问题。好吧，我没有收到异常，但它跳转到 if 条件的 else {} block ，当我调试时，我发现:

 NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);

mWifi 有这样的:NetworkInfo:类型:wifi[]，状态:未知/空闲，原因:(未指定)

ConnectivityManager connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
         NetworkInfo mWifi = connManager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);


        if (mWifi.isConnectedOrConnecting()){

            Toast.makeText(this,"void action Working", 3).show();



        }
        else
        {
            Toast.makeText(this,"void action Not working", 3).show();

        }

Answer 1

你可以这样做:

            final WifiManager wifiManager = (WifiManager) YourActivity.this.getSystemService(Context.WIFI_SERVICE); 

            if (!wifiManager.isWifiEnabled()) {

                wifiManager.setWifiEnabled(true); //If it's, off turn it on.

            }else{

                //Do what you want to do with wi-fi.            

            }

另请注意，我在 list 中设置了以下权限(也许您的情况并不需要所有这些权限，因为我正在实现 wifi direct 功能):

  <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission
    android:name="android.permission.ACCESS_WIFI_STATE"
    android:required="true" />
<uses-permission
    android:name="android.permission.CHANGE_WIFI_STATE"
    android:required="true" />
<uses-permission
    android:name="android.permission.INTERNET"
    android:required="true" />