listView和ScroolView共同作用，导致ListView默认显示一行

工具类DisplayUtil

package com.example.demo;

import android.content.Context;
import android.util.DisplayMetrics;

public class DisplayUtils {
    private DisplayUtils(Context context){

    }

    private static DisplayUtils mInstance;
    private static Context mContext;
    public static DisplayUtils getInstance(Context context){
        if(mInstance==null){
            mContext = context;
            mInstance = new DisplayUtils(context);
        }
        return mInstance;
    }

    public static int px2dp(int px){
        DisplayMetrics metrics = mContext.getResources().getDisplayMetrics();
        return (int) (metrics.density*px);
    }
}

测试代码

package com.example.demo;


import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {
ListView listContent;
ContentAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    listContent = (ListView) findViewById(R.id.id_send_gift_pop_listview);
    adapter = new ContentAdapter();
    listContent.setAdapter(adapter);
    setListViewHeightBasedOnChildren(listContent);

    listContent.setOnItemClickListener(new OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView arg0, View arg1, int arg2,
                long arg3) {
            // TODO Auto-generated method stub
            System.out.println("__old all view click");
        }
    });
}

public void setListViewHeightBasedOnChildren(ListView listView) {

    //获取listview的适配器 
    ListAdapter listAdapter = listView.getAdapter(); //item的高度
    if (listAdapter == null) {
        return; 
    } 
    int totalHeight = 0;

    for (int i = 0; i < listAdapter.getCount(); i++) { 
        View listItem = adapter.getView(i, null, listView);
        listItem.measure(0, 0); //计算子项View 的宽高 //统计所有子项的总高度 
        totalHeight += DisplayUtils.getInstance(this).px2dp(listItem.getMeasuredHeight())+listView.getDividerHeight();
    } 
    ViewGroup.LayoutParams params = listView.getLayoutParams();
    params.height = totalHeight;
    listView.setLayoutParams(params);
}





@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

private int num =4;

class ContentAdapter extends BaseAdapter{

    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return num;
    }

    @Override
    public Object getItem(int arg0) {
        // TODO Auto-generated method stub
        return null;
    }

    @Override
    public long getItemId(int arg0) {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public View getView(int postion, View content, ViewGroup arg2) {
        // TODO Auto-generated method stub
        if(content==null){
            LayoutInflater inflater =  (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            content = inflater.inflate(R.layout.item, null);
            ViewHolder holder = new ViewHolder();
            holder.view = (View) content.findViewById(R.id.view);
            holder.info = (TextView) content.findViewById(R.id.info);
            holder.send = (Button) content.findViewById(R.id.send);
            content.setTag(holder);
        }
        ViewHolder holder = (ViewHolder) content.getTag();
        holder.info.setText("info");
        holder.info.setText("info");
        holder.view.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                System.out.println("__all view click");
                num++;
            }
        });
        holder.send.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View arg0) {
                // TODO Auto-generated method stub
                System.out.println("__send view click");
                num--;
                adapter.notifyDataSetChanged();
            }
        });
        return content;
    }

    class ViewHolder{
        private View view;
        private TextView info;
        private Button send;
    }

}

}