Android 10自动连接WiFi问题

1. 说明：本文主要说明扫码之后自动连接WiFi的一些处理，扫码的流程相对简单，网上教程也比较多，对于目前Android各个版本也没有太多变化。
2. 问题描述：最近在做项目的时候，发现以前的项目有扫描二维码自动连接WiFi的功能，设备改了生成二维码的方式，然后发现手机无法自动连接WiFi了。
3. 问题原因：经过代码调试发现：（我都是真机调试）

   wifiManager.addNetwork(WifiConfiguration);

   在添加WiFi的时候，这行代码始终返回-1，换用同事手机竟然神奇的可以连接，然后一脸蒙蔽，裂开了，不怕有问题，就怕有的有问题，有的没问题。
4. 问题解决：

• 区别：我测试手机 小米10 android Q（andorid 10）的系统，同事手机荣耀 android P的系统，大胆猜测是不是android 10又搞了什么奇怪的东西
• 根因：皇天不负有心人，上代码：

  /**
       * Add a new network description to the set of configured networks.
       * The {@code networkId} field of the supplied configuration object
       * is ignored.
       * <p/>
       * The new network will be marked DISABLED by default. To enable it,
       * called {@link #enableNetwork}.
       *
       * @param config the set of variables that describe the configuration,
       *            contained in a {@link WifiConfiguration} object.
       *            If the {@link WifiConfiguration} has an Http Proxy set
       *            the calling app must be System, or be provisioned as the Profile or Device Owner.
       * @return the ID of the newly created network description. This is used in
       *         other operations to specified the network to be acted upon.
       *         Returns {@code -1} on failure.
       *
       * @deprecated
       * a) See {@link WifiNetworkSpecifier.Builder#build()} for new
       * mechanism to trigger connection to a Wi-Fi network.
       * b) See {@link #addNetworkSuggestions(List)},
       * {@link #removeNetworkSuggestions(List)} for new API to add Wi-Fi networks for consideration
       * when auto-connecting to wifi.
       * <b>Compatibility Note:</b> For applications targeting
       * {@link android.os.Build.VERSION_CODES#Q} or above, this API will always return {@code -1}.
       */
      @Deprecated
      public int addNetwork(WifiConfiguration config) {
          if (config == null) {
              return -1;
          }
          config.networkId = -1;
          return addOrUpdateNetwork(config);
      }

  这是WifiManager.class中addNetwork方法的描述，注意注释中最后一行

{@link android.os.Build.VERSION_CODES#Q} or above, this API will always return {@code -1}.

android Q或者更高的版本，这个方法始终返回-1，至此问题原因分析完毕，接下来开始解决：官网一顿操作：Android 10 的新方案如下连接：https://developer.android.google.cn/guide/topics/connectivity/wifi-bootstrap

 代码如下：

public void test()
    {
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q)
        {
            NetworkSpecifier specifier =
                    new WifiNetworkSpecifier.Builder()
                            .setSsidPattern(new PatternMatcher("此处WiFi名称", PatternMatcher.PATTERN_PREFIX))
                            .setWpa2Passphrase("此处WiFi密码")
                            .build();

            NetworkRequest request =
                    new NetworkRequest.Builder()
                            .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                            .removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
                            .setNetworkSpecifier(specifier)
                            .build();

            ConnectivityManager connectivityManager = (ConnectivityManager)
                    context.getSystemService(Context.CONNECTIVITY_SERVICE);

            ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
                @Override
                public void onAvailable(Network network) {
                    // do success processing here..
                }

                @Override
                public void onUnavailable() {
                    // do failure processing here..
                }
            };
            connectivityManager.requestNetwork(request, networkCallback);
            // Release the request when done.
            // connectivityManager.unregisterNetworkCallback(networkCallback);
        }
    }

注：我用的是WPA的 加密模式，亲测可用。至此完结，撒花。