由于安卓版本不同,获取SSID的方式也不一样,之前因为版本的原因导致获取到的SSID为空.先上代码

public String getWifiName(Context context){
            //获取Wifi的SSID
            WifiManager wifiManager=(WifiManager) context.getSystemService(context.WIFI_SERVICE);
            if(Build.VERSION.SDK_INT == Build.VERSION_CODES.O_MR1){
                //android 8.1,SDK 27
                ConnectivityManager connManager =(ConnectivityManager) context.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE); 
                assert connManager != null;
                NetworkInfo networkInfo = connManager.getActiveNetworkInfo();
                if (networkInfo.isConnected()) {
                    if (networkInfo.getExtraInfo()!=null){
                        return networkInfo.getExtraInfo().replace("\"","");
                    }
                }
            }
            assert wifiManager != null;
            WifiInfo info = wifiManager.getConnectionInfo();
            return info.getSSID().replace("\"", "");
    }

另外 android 8,9,10及以上的需要添加权限

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

后两个是访问定位信息,需要在程序中手动申请打开(申请ACCESS_FINE_LOCATION就行)

RxPermissions rxPermission = new RxPermissions(this);
if(rxPermission.isGranted(Manifest.permission.ACCESS_FINE_LOCATION)){
    //Toast.makeText(this,"定位权限已获取",Toast.LENGTH_LONG).show();
    
}
else {
    //申请定位权限
    rxPermission.request(Manifest.permission.ACCESS_FINE_LOCATION).subscribe(granted->{
        //成功获取
        
    });
}

RxPermissions 类是用于权限使用的第三方,需要在build.gradle里的dependencies里添加
implementation 'com.github.tbruyelle:rxpermissions:0.12'//权限使用的类
implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
implementation "io.reactivex.rxjava3:rxjava:3.0.4"