scrollview嵌套listview效果

網上看了一下代碼，然後自己跟着實現了一遍，下面是代碼：

package app.scrollviewincludelistview;

import android.app.Activity;
import android.app.ListActivity;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.ScrollView;

public class MainActivity extends Activity {
    private ListView listView;
    private ScrollView scrollView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        scrollView= (ScrollView) findViewById(R.id.scrollview);
        listView= (ListView) findViewById(R.id.list);
        String[] strings=new String[30];
        for (int i = 0; i <strings.length ; i++) {
            strings[i]="aaaa"+i;
        }
        ArrayAdapter adapter;
        adapter = new ArrayAdapter(this,R.layout.item,strings);
        listView.setAdapter(adapter);
        setListviewHeight(listView);

    }

    private void setListviewHeight(ListView listview){
        ListAdapter listadapter=listview.getAdapter();
        if (listadapter==null)
            return;
        int totalHeight=0;
        for (int i = 0; i < listadapter.getCount(); i++) {
            View listitem=listadapter.getView(i,null,listview);
            //計算子項的高度和寬度
            listitem.measure(0,0);
            //統計所有子項的總高度
            totalHeight+=listitem.getMeasuredHeight();
        }
        ViewGroup.LayoutParams params=listview.getLayoutParams();
        // listView.getDividerHeight()獲取子項間分隔符佔用的高度
        // params.height最後得到整個ListView完整顯示需要的高度
        params.height=totalHeight+listview.getDividerHeight()*(listadapter.getCount()-1);
        listview.setLayoutParams(params);
    }

}