获取Wifi列表：
扫描（这个方法早在Android 9.0 就被弃用），不过如果不调用的话是没法及时获取Wifi列表的广播的。（不需要也能正常获取，没有延迟，经实验毫无区别）
public static void searchWifiList(WifiManager manager) {
manager.startScan();
}创建广播并接收：
/**
* 获取附近的WiFi列表
*
* @param manager WifiManager
* @param flag 是否保留重名但BSSID不同的wifi true保留，false不保留
* @return wifi列表
*/
public static List<ScanResult> scanResults(WifiManager manager, boolean flag) {
List<ScanResult> scanResults = new ArrayList<>();
HashSet<String> hs = new HashSet<>();
Log.d("WifiUtils", "scanResults: " + manager.getScanResults().size());
if (flag) {
scanResults = manager.getScanResults();
return scanResults;
}
for (ScanResult scanResult : manager.getScanResults()) {
if (hs.add(scanResult.SSID)) {
scanResults.add(scanResult);
}
}
return scanResults;
}private final BroadcastReceiver receiver = new BroadcastReceiver() {
@Override
public void onReceive(Context context, Intent intent) {
if (intent.getAction().equals(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)) {
Log.d("WifiFragment", "onReceive: 刷新数据");
results = WifiUtils.scanResults(manager, true);
mainBinding.scanResult.getAdapter().notifyDataSetChanged();
} else if (intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
switch (wifiState) {
case WifiManager.WIFI_STATE_DISABLED:
Log.d("WifiFragment", "onReceive: wifi 关闭");
mainBinding.switchWifi.setText("已停用");
results = new ArrayList<>();
mainBinding.scanResult.getAdapter().notifyDataSetChanged();
break;
case WifiManager.WIFI_STATE_DISABLING:
case WifiManager.WIFI_STATE_ENABLING:
case WifiManager.WIFI_STATE_UNKNOWN:
break;
case WifiManager.WIFI_STATE_ENABLED:
Log.d("WifiFragment", "onReceive: wifi 打开");
mainBinding.switchWifi.setText("已启用");
break;
}
}
}
};配置并连接（无系统签名）：
/**
* 创建连接
* @param manager WifiManager
* @param ssid Wifi名称
* @param bssid 唯一标识（可以为空）
* @param passwd 密码 （当前网络是开放网络时，可以为空）
* @param isHidden 是否是隐藏网络
* @param capabilities 安全协议（根据协议选择连接方式）
*/
@RequiresApi(api = Build.VERSION_CODES.Q)
public static void connectWifiForQ(WifiManager manager, String ssid, String bssid, String passwd, boolean isHidden, String capabilities) {
if (capabilities.contains("WPA-PSK") || capabilities.contains("WPA2-PSK")) {
setWPA2ForQ(manager, ssid, bssid, passwd, isHidden);
} else {
setESSForQ(manager, ssid, isHidden);
}
}
// WPA2-PSK
@RequiresApi(api = Build.VERSION_CODES.Q)
public static int setWPA2ForQ(WifiManager manager, String ssid, String bssid, String passwd, boolean isHidden) {
WifiNetworkSuggestion suggestion;
if (bssid == null) {
suggestion= new WifiNetworkSuggestion.Builder()
.setSsid(ssid)
.setWpa2Passphrase(passwd)
.setIsHiddenSsid(isHidden)
.build();
} else {
suggestion= new WifiNetworkSuggestion.Builder()
.setSsid(ssid)
.setBssid(MacAddress.fromString(bssid))
.setWpa2Passphrase(passwd)
.setIsHiddenSsid(isHidden)
.build();
}
List<WifiNetworkSuggestion> suggestions = new ArrayList<>();
suggestions.add(suggestion);
int status = manager.addNetworkSuggestions(suggestions);
if (status != WifiManager.STATUS_NETWORK_SUGGESTIONS_SUCCESS) {
// 连接失败
Log.d("WifiUtils", "setWPA2ForQ: 添加失败");
} else {
Log.d("WifiUtils", "setWPA2ForQ: 添加成功");
}
return status;
}
// ESS
@RequiresApi(api = Build.VERSION_CODES.Q)
public static int setESSForQ(WifiManager manager, String ssid, boolean isHidden) {
WifiNetworkSuggestion suggestion = new WifiNetworkSuggestion.Builder()
.setSsid(ssid)
.setIsHiddenSsid(isHidden)
.build();
List<WifiNetworkSuggestion> suggestions = new ArrayList<>();
suggestions.add(suggestion);
int status = manager.addNetworkSuggestions(suggestions);
if (status != WifiManager.STATUS_NETWORK_SUGGESTIONS_SUCCESS) {
// 连接失败
Log.d("WifiUtils", "setWPA2ForQ: 添加失败");
} else {
Log.d("WifiUtils", "setWPA2ForQ: 添加成功");
}
return status;
}配置并连接（有系统签名）：
/**
* 连接wifi
*
* @param manager WifiManager
* @param configuration Wifi配置
* @return 是否连接成功
*/
public static boolean connectWifi(WifiManager manager, WifiConfiguration configuration) {
int id = manager.addNetwork(configuration);
WifiInfo connectionInfo = manager.getConnectionInfo();
manager.disableNetwork(connectionInfo.getNetworkId());
boolean b = manager.enableNetwork(id, true);
Log.d("WifiManagerUtils", "connectWifi: 连接状态=" + b);
if (b) {
manager.saveConfiguration();
} else {
Log.d("WifiManagerUtils", configuration.toString());
}
return b;
}
/**
* 创建Wifi配置
*
* @param SSID wifi名称
* @param password wifi密码
* @param hidden 网络是否隐藏（该方法与添加隐藏网络通用）
* @param capabilities 网络安全协议
* @return 配置好的wifi
*/
public static WifiConfiguration createWifiInfo(String SSID, String password, boolean hidden, String capabilities) {
WifiConfiguration configuration = new WifiConfiguration();
configuration.SSID = "\"" + SSID + "\"";
if (hidden) {
configuration.hiddenSSID = true;
}
Log.d("WifiManagerUtils", "createWifiInfo: " + capabilities);
if (capabilities.contains("SAE") && Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
setWPA3(configuration, password);
} else if (capabilities.contains("WPA-PSK") || capabilities.contains("WPA2-PSK")) {
setWPA(configuration, password);
} else if (capabilities.contains("WEP")) {
setWEP(configuration, password);
} else {
setESS(configuration);
}
return configuration;
}
/**
* 设置wpa3协议
*
* @param configuration 配置
* @param password 密码
*/
public static void setWPA3(WifiConfiguration configuration, String password) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.SAE);
}
configuration.preSharedKey = "\"" + password + "\"";
}
/**
* WPA协议
*
* @param configuration 配置
* @param password 密码
*/
public static void setWPA(WifiConfiguration configuration, String password) {
configuration.preSharedKey = "\"" + password + "\"";
//公认的IEEE 802.11验证算法。
configuration.allowedAuthAlgorithms.clear();
configuration.allowedAuthAlgorithms.set(WifiConfiguration.AuthAlgorithm.OPEN);
//公认的的公共组密码。
configuration.allowedGroupCiphers.clear();
configuration.allowedGroupCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.TKIP);
//公认的密钥管理方案。
configuration.allowedKeyManagement.clear();
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
//密码为WPA。
configuration.allowedPairwiseCiphers.clear();
configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.CCMP);
configuration.allowedPairwiseCiphers.set(WifiConfiguration.PairwiseCipher.TKIP);
//公认的安全协议。
configuration.allowedProtocols.clear();
configuration.allowedProtocols.set(WifiConfiguration.Protocol.RSN);
}
/**
* WEP协议
*
* @param configuration 配置
* @param password 密码
*/
public static void setWEP(WifiConfiguration configuration, String password) {
configuration.wepKeys[0] = "\"" + password + "\"";
configuration.wepTxKeyIndex = 0;
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
configuration.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40);
}
/**
* 无密码
*
* @param configuration 配置
*/
public static void setESS(WifiConfiguration configuration) {
configuration.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.NONE);
}断开连接（无系统签名）：
//Android11及以上可以使用，清除建议列表，可以断开当前的网络
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) {
List<WifiNetworkSuggestion> networkSuggestions = wifiManager.getNetworkSuggestions();
wifiManager.removeNetworkSuggestions(networkSuggestions);
}监听连接状态：
//监听网络连接状态
connectivityManager.registerDefaultNetworkCallback(new ConnectivityManager.NetworkCallback(){
@Override
public void onAvailable(@NonNull Network network) {
super.onAvailable(network);
Log.d("MainActivity", "onAvailable: 网络已连接");
Toast.makeText(MainActivity.this, "已连接网络", Toast.LENGTH_SHORT).show();
}
@Override
public void onUnavailable() {
super.onUnavailable();
Log.d("MainActivity", "onUnavailable: 网络已断开");
Toast.makeText(MainActivity.this, "已断开网络", Toast.LENGTH_SHORT).show();
}
});注意事项：
断开当前Wifi后，再重新连接该Wifi，可能会出现无法连接的情况。
这种情况我是通过关闭Wifi后再重新打开解决的，但是对Wifi的开关控制要涉及到权限问题——
需要System权限，在Manifest中添加：
android:sharedUserId="android.uid.system"然后需要系统签名，可在系统源码中获得。
不知道各位有没有什么好的解决方法。
不需系统签名的方法（需要root）：
步骤如下——
1、在/data目录下创建一个文本，用来标识Wifi是打开或者关闭状态，比如：
文本文件名字：node
内容：0 // （0是关，1是开）2、chmod 666 /data/node (赋予该文件的读写权限）
3、创建循环检测该文件内容的脚本，并针对内容执行adb命令
adb shell svc wifi enable // 开启WIFI
adb shell svc wifi disable // 关闭WIFI4、应用端（App）对该文本进行读写
即可实现不需系统签名也可控制WIFI模块的开关
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