如何在WebView中设置黑暗主题？

import android.os.Bundle;
import android.webkit.WebSettings;
import android.webkit.WebView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {

    private WebView webView;

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

        webView = findViewById(R.id.webView);

        WebSettings webSettings = webView.getSettings();
        webSettings.setForceDark(WebSettings.FORCE_DARK_ON);

        webView.loadUrl("https://www.example.com");
    }
}