Android中的Wi-Fi编程

WifiManager wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
if (wifiManager.isWifiEnabled()) {
    // Wi-Fi已启用
} else {
    // Wi-Fi未启用
}

WifiConfiguration wifiConfig = new WifiConfiguration();
wifiConfig.SSID = "\"" + ssid + "\"";
wifiConfig.preSharedKey = "\"" + password + "\"";
wifiManager.disconnect();
int networkId = wifiManager.addNetwork(wifiConfig);
wifiManager.enableNetwork(networkId, true);
wifiManager.reconnect();

WifiInfo wifiInfo = wifiManager.getConnectionInfo();
if (wifiInfo != null) {
    String ssid = wifiInfo.getSSID();
    String bssid = wifiInfo.getBSSID();
    int rssi = wifiInfo.getRssi();
    int linkSpeed = wifiInfo.getLinkSpeed();
    int networkId = wifiInfo.getNetworkId();
}

wifiManager.startScan();
List<ScanResult> scanResults = wifiManager.getScanResults();
for (ScanResult scanResult : scanResults) {
    String ssid = scanResult.SSID;
    String bssid = scanResult.BSSID;
    int level = scanResult.level;
    int frequency = scanResult.frequency;
}

BroadcastReceiver wifiReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_UNKNOWN);
        switch (wifiState) {
            case WifiManager.WIFI_STATE_ENABLED:
                // Wi-Fi已启用
                break;
            case WifiManager.WIFI_STATE_DISABLED:
                // Wi-Fi已禁用
                break;
        }
    }
};
IntentFilter intentFilter = new IntentFilter(WifiManager.WIFI_STATE_CHANGED_ACTION);
registerReceiver(wifiReceiver, intentFilter);

BroadcastReceiver networkReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        NetworkInfo networkInfo = intent.getParcelableExtra(ConnectivityManager.EXTRA_NETWORK_INFO);
        if (networkInfo.getType() == ConnectivityManager.TYPE_WIFI) {
            if (networkInfo.isConnected()) {
                // 已连接到Wi-Fi网络
            } else {
                // 未连接到Wi-Fi网络
            }
        }
    }
};
IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(networkReceiver, intentFilter);

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

<uses-feature android:name="android.hardware.wifi" />