1、AndroidManifest.xml 配置权限

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

2、手动申请权限

 在登录或首页activity中添加该方法，并在onCreate()方法中调用：

protected void applyPermission() {
        String[] permissions = {
                Manifest.permission.READ_EXTERNAL_STORAGE,
                Manifest.permission.INTERNET,
                Manifest.permission.ACCESS_NETWORK_STATE,
                Manifest.permission.MODIFY_AUDIO_SETTINGS,
                Manifest.permission.WRITE_EXTERNAL_STORAGE,
                Manifest.permission.WRITE_SETTINGS,
                Manifest.permission.READ_PHONE_STATE,
                Manifest.permission.ACCESS_WIFI_STATE,
                Manifest.permission.CHANGE_WIFI_STATE,
                Manifest.permission.CHANGE_NETWORK_STATE,
                Manifest.permission.RECORD_AUDIO,
                Manifest.permission.READ_CALENDAR,
                Manifest.permission.READ_CONTACTS,
                Manifest.permission.ACCESS_COARSE_LOCATION,
                Manifest.permission.ACCESS_FINE_LOCATION,
                Manifest.permission.WAKE_LOCK,
                Manifest.permission.CAMERA,
                Manifest.permission.MODIFY_PHONE_STATE,
                Manifest.permission.CHANGE_WIFI_MULTICAST_STATE
        };

        ArrayList<String> toApplyList = new ArrayList<>();
        for (String perm : permissions) {
            if (PackageManager.PERMISSION_GRANTED != ContextCompat.checkSelfPermission(this, perm)) {
                toApplyList.add(perm);
                //进入到这里代表没有权限.
            }
        }
        String[] tmpList = new String[toApplyList.size()];
        if (!toApplyList.isEmpty()) {
            ActivityCompat.requestPermissions(this, toApplyList.toArray(tmpList), 1);
        }
    }

3、获取当前连接的wifi名称的方法

private void getConnectWifiSsid2(){
    WifiManager mWifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
    //这里获取的是连接的wifi名称
    String connect_wifi_name = mWifiManager.getConnectionInfo().getSSID().replace("\"", "");
    Log.d("getConnectWifiSsid", "connect_wifi_name：" + connect_wifi_name); //打印全部wifi信息
    Log.d("getConnectWifiSsid", "SSID：" + connect_wifi_name);      //打印SSID
}

提示：APP安装完成之后，重启生效