要在Android Q中通过编程方式连接到WiFi并访问互联网，您可以使用以下代码示例：

首先，确保您在AndroidManifest.xml文件中添加了必要的权限：

然后，在您的活动或片段中使用以下代码来连接到WiFi并访问互联网：

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.Network;
import android.net.NetworkCapabilities;
import android.net.NetworkRequest;
import android.net.wifi.WifiConfiguration;
import android.net.wifi.WifiManager;
import android.os.Bundle;
import android.util.Log;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";

    private WifiManager wifiManager;
    private ConnectivityManager connectivityManager;
    private NetworkRequest networkRequest;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        wifiManager = (WifiManager) getApplicationContext().getSystemService(Context.WIFI_SERVICE);
        connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);

        // 设置WiFi网络请求
        networkRequest = new NetworkRequest.Builder()
                .addTransportType(NetworkCapabilities.TRANSPORT_WIFI)
                .build();

        // 注册网络回调
        connectivityManager.registerNetworkCallback(networkRequest, networkCallback);

        // 连接到WiFi网络
        connectToWifi("YourWifiSSID", "YourWifiPassword");
    }

    private void connectToWifi(String ssid, String password) {
        if (wifiManager.isWifiEnabled()) {
            WifiConfiguration wifiConfig = new WifiConfiguration();
            wifiConfig.SSID = String.format("\"%s\"", ssid);
            wifiConfig.preSharedKey = String.format("\"%s\"", password);

            int networkId = wifiManager.addNetwork(wifiConfig);
            wifiManager.disconnect();
            wifiManager.enableNetwork(networkId, true);
            wifiManager.reconnect();
        } else {
            Log.e(TAG, "WiFi is disabled");
        }
    }

    private final ConnectivityManager.NetworkCallback networkCallback = new ConnectivityManager.NetworkCallback() {
        @Override
        public void onAvailable(@NonNull Network network) {
            super.onAvailable(network);
            Log.d(TAG, "Network available");

            // 检查网络是否可以访问互联网
            NetworkCapabilities capabilities = connectivityManager.getNetworkCapabilities(network);
            if (capabilities != null && capabilities.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET)) {
                Log.d(TAG, "Internet access available");
                // 在这里执行您的互联网相关操作
            } else {
                Log.e(TAG, "No internet access");
            }
        }

        @Override
        public void onLost(@NonNull Network network) {
            super.onLost(network);
            Log.d(TAG, "Network lost");
        }
    };

    @Override
    protected void onDestroy() {
        super.onDestroy();
        // 注销网络回调
        connectivityManager.unregisterNetworkCallback(networkCallback);
    }
}

请确保将"YourWifiSSID"和"YourWifiPassword"替换为实际的WiFi网络名称和密码。

这段代码将使用WifiManager连接到指定的WiFi网络，并使用ConnectivityManager注册一个网络回调来检查网络是否可用以及是否可以访问互联网。