写一个适配android11的wifi开发代码

以下是一个适配Android 11的WiFi开发代码示例：

1. 在AndroidManifest.xml文件中添加以下权限：

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

2. 在你的Java代码中，使用以下代码来检查是否已获得位置权限：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_BACKGROUND_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    requestPermissions(new String[]{Manifest.permission.ACCESS_BACKGROUND_LOCATION}, PERMISSION_REQUEST_CODE);
}

3. 在Android 11中，需要先请求位置权限才能扫描WiFi网络。以下是一个例子：

if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
    ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSION_REQUEST_CODE);
} else {
    startWifiScan();
}

4. 在Android 11及以上版本中，需要使用以下代码来打开WiFi：

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q) {
    WifiNetworkSpecifier specifier = new WifiNetworkSpecifier.Builder().setSsid(ssid).build();
    NetworkRequest request = new NetworkRequest.Builder().addTransportType(NetworkCapabilities.TRANSPORT_WIFI).setNetworkSpecifier(specifier).build();
    ConnectivityManager connectivityManager = (ConnectivityManager) getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
    ConnectivityManager.NetworkCallback callback = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(Network network) {
            super.onAvailable(network);
            // WiFi已连接
        }

        @Override
        public void onUnavailable() {
            super.onUnavailable();
            // WiFi连接不可用
        }
    };
    connectivityManager.requestNetwork(request, callback);
} else {
    wifiManager.setWifiEnabled(true);
    WifiConfiguration configuration = new WifiConfiguration();
    configuration.SSID = "\"" + ssid + "\"";
    int networkId = wifiManager.addNetwork(configuration);
    wifiManager.disconnect();
    wifiManager.enableNetwork(networkId, true);
    wifiManager.reconnect();
}

5. 扫描您周围的WiFi网络，您可以使用以下代码：

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(WIFI_SERVICE);
if (!wifiManager.isWifiEnabled()) {
    wifiManager.setWifiEnabled(true);
}
registerReceiver(wifiScanReceiver, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
wifiManager.startScan();

6. 可以使用以下代码来获取WiFi扫描结果：

public BroadcastReceiver wifiScanReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        List<ScanResult> results = wifiManager.getScanResults();
        for (ScanResult result : results) {
            String ssid = result.SSID;
            // 处理WiFi扫描结果
        }
        unregisterReceiver(this);
    }
};

这是一个适配Android 11的WiFi开发代码示例，仅供参考。在实际使用时，您应该根据您的应用程序需要进行修改和调整。