android 获取连接WiFi的名称SSID

我们经常会用到wifi的定向连接，需要对连接的wifi名称进行判断

首先权限声明，在manifest中添加

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> <!-- 获取WIFI信息状态的权限 -->  
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> <!-- 获取网络状态改变的权限 -->  

java代码获取wifi名称

WifiManager wifiMgr = (WifiManager) mActivity.getSystemService(Context.WIFI_SERVICE);
WifiInfo info = wifiMgr.getConnectionInfo();
//输出字符串有双引号
String wifiId = info != null ? info.getSSID() : null;

wifi连接IP地址获取及wifi是否正常使用

public static InetAddress getWifiIp() {
        Context myContext = Globals.getContext();
        if (myContext == null) {
            throw new NullPointerException("Global context is null");
        }
        WifiManager wifiMgr = (WifiManager) myContext.getSystemService(Context.WIFI_SERVICE);
        if (isWifiEnabled()) {
            int ipAsInt = wifiMgr.getConnectionInfo().getIpAddress();
            if (ipAsInt == 0) {
                return null;
            } else {
                return Util.intToInet(ipAsInt);
            }
        } else {
            return null;
        }
    }
 
 
　　// 取得wifi的ip地址
　　InetAddress address = FTPServerService.getWifiIp();
　　address.getHostAddress();
　　
public static boolean isWifiEnabled() {
        Context myContext = Globals.getContext();
        if (myContext == null) {
            throw new NullPointerException("Global context is null");
        }
        WifiManager wifiMgr = (WifiManager) myContext.getSystemService(Context.WIFI_SERVICE);
        if (wifiMgr.getWifiState() == WifiManager.WIFI_STATE_ENABLED) {
            ConnectivityManager connManager = (ConnectivityManager) myContext
                    .getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo wifiInfo = connManager
                    .getNetworkInfo(ConnectivityManager.TYPE_WIFI);
            return wifiInfo.isConnected();
        } else {
            return false;
        }
    }

补充跳转wifi设置界面intent

Intent intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
startActivity(intent);