WifiNetworkSuggestion官方文档
一.只使用WifiNetworkSpecifier（可直接连接到指定wifi，但会几率出现弹出连接失败框-实际是连接成功的情况）
private void connectWifi(String ssid, String pwd) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
WifiNetworkSpecifier wifiNetworkSpecifier = new WifiNetworkSpecifier.Builder()
.setSsid(ssid)
.setWpa2Passphrase(pwd)
.build();
NetworkRequest request = new NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
.removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
.setNetworkSpecifier(wifiNetworkSpecifier)
.build();
mConnectivityManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
mNetworkCallback = new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(@NonNull Network network) {
super.onAvailable(network);
@Override
public void onUnavailable() {
super.onUnavailable();
mConnectivityManager.requestNetwork(request, mNetworkCallback);
} else {
@Override
public void destroy() {
if (mConnectivityManager != null && mNetworkCallback != null) {
mConnectivityManager.unregisterNetworkCallback(mNetworkCallback);
二.WifiNetworkSuggestion + WifiNetworkSpecifier (思路：先添加建议，再连接，成功率高)
private void connectWifi(String ssid, String pwd) {
if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
WifiNetworkSuggestion suggestion =
new WifiNetworkSuggestion.Builder()
.setSsid(ssid)
.setWpa2Passphrase((pwd))
.setIsAppInteractionRequired(true)
.build();
List<WifiNetworkSuggestion> suggestionsList = new ArrayList<>();
suggestionsList.add(suggestion);
WifiManager wifiManager = (WifiManager) activity.getApplicationContext().getSystemService(Context.WIFI_SERVICE);
int status = wifiManager.addNetworkSuggestions(suggestionsList);
if (status == WifiManager.STATUS_NETWORK_SUGGESTIONS_SUCCESS) {
WifiNetworkSpecifier wifiNetworkSpecifier = new WifiNetworkSpecifier.Builder()
.setSsid(ssid)
.setWpa2Passphrase(pwd)
.build();
NetworkRequest request = new NetworkRequest.Builder()
.addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
.removeCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)
.setNetworkSpecifier(wifiNetworkSpecifier)
.build();
mConnectivityManager = (ConnectivityManager) activity.getSystemService(Context.CONNECTIVITY_SERVICE);
mNetworkCallback = new ConnectivityManager.NetworkCallback() {
@Override
public void onAvailable(@NonNull Network network) {
super.onAvailable(network);
@Override
public void onUnavailable() {
super.onUnavailable();
mConnectivityManager.requestNetwork(request, mNetworkCallback);
} else {}
WifiNetworkSuggestion是给系统添加一个wifi建议，手动关闭再打开wifi开关后会优先连接你建议的wifi，但是他不会主动发起连接。且只能被创建建议的应用使用。
WifiNetworkSpecifier是主动连接，但是只使用它去连接时，会弹出系统连接失败的框（实际上关闭框后时连接成功的），配合WifiNetworkSuggestion一起使用效果较好。
连接指定wifi后，如果此wifi消失，系统不会自动连接到原有wifi。
解决：取消注册后，即可自动恢复到之前的wifi
mConnectivityManager.unregisterNetworkCallback(mNetworkCallback)
五.wifi连接后需要通过Socket与设备通信的可以看第二篇文章
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