如何在可滚动的活动中将按钮放在ListView下面？

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/button"
        android:divider="@android:color/darker_gray"
        android:dividerHeight="1dp" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="按钮" />

</RelativeLayout>

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private ListView listView;
    private Button button;
    private List<String> dataList;

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

        listView = findViewById(R.id.listView);
        button = findViewById(R.id.button);

        // 创建数据列表
        dataList = new ArrayList<>();
        dataList.add("数据1");
        dataList.add("数据2");
        dataList.add("数据3");

        // 创建适配器并设置给ListView
        final ArrayAdapter<String> adapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(adapter);

        // 设置ListView的点击事件监听器
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String item = adapter.getItem(position);
                Toast.makeText(MainActivity.this, "点击了：" + item, Toast.LENGTH_SHORT).show();
            }
        });

        // 设置按钮的点击事件监听器
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                // 在此处添加按钮点击后的操作
                Toast.makeText(MainActivity.this, "按钮被点击了", Toast.LENGTH_SHORT).show();
            }
        });
    }
}