使用CustomTabsIntent启动webview后显示AlertDialog

implementation 'androidx.browser:browser:1.3.0'

import android.net.Uri;
import android.os.Bundle;
import android.widget.Toast;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;
import androidx.browser.customtabs.CustomTabsIntent;

public class MainActivity extends AppCompatActivity {

    private CustomTabsIntent customTabsIntent;

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

        // 创建CustomTabsIntent对象
        customTabsIntent = new CustomTabsIntent.Builder().build();

        // 启动webview
        Uri uri = Uri.parse("https://www.example.com");
        customTabsIntent.launchUrl(this, uri);

        // 监听网页加载完成事件
        customTabsIntent.setOnNavigationEvent(new CustomTabsIntent.OnNavigationEventHandler() {
            @Override
            public boolean onNavigationEvent(int navigationEvent, Bundle extras) {
                if (navigationEvent == CustomTabsIntent.NAVIGATION_FINISHED) {
                    // 网页加载完成，显示AlertDialog
                    showAlertDialog();
                }
                return false;
            }
        });
    }

    private void showAlertDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("网页加载完成");
        builder.setMessage("网页加载完成，是否关闭网页？");
        builder.setPositiveButton("关闭", (dialog, which) -> {
            // 关闭网页
            finish();
        });
        builder.setNegativeButton("取消", (dialog, which) -> {
            // 取消操作
            Toast.makeText(MainActivity.this, "取消关闭网页", Toast.LENGTH_SHORT).show();
        });
        AlertDialog alertDialog = builder.create();
        alertDialog.show();
    }
}