第一种方法：

在计算listview总高度并设置

使用该方法需要注意：子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

ScrollView下只能有一个字布局

item布局

子ListView的每个Item必须是LinearLayout，不能是其他的，因为其他的Layout(如RelativeLayout)没有重写onMeasure()，所以会在onMeasure()时抛出异常。

MainActivity.java（红色为方法）

package com.bawei.day06_scrollview;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.view.View;import android.view.View.MeasureSpec;import android.view.ViewGroup;import android.view.ViewGroup.LayoutParams;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.ListView;public class MainActivity extends Activity {    private ListView listView;    private List
     
       list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    listView = (ListView) findViewById(R.id.listview);    list = new ArrayList
      
       ();        for (int i = 0; i < 200; i++) {        list.add(i+"");    }        BaseAdapter adapter=new Adper(MainActivity.this,list);        listView.setAdapter(adapter);                }    //界面加载完  @Overridepublic void onWindowFocusChanged(boolean hasFocus) {    // TODO Auto-generated method stub    super.onWindowFocusChanged(hasFocus);    setListViewHeightBasedOnChildren(listView);}  public void setListViewHeightBasedOnChildren(ListView listView) {      //BaseAdapter为listview布局      BaseAdapter listAdapter = (BaseAdapter) listView.getAdapter();       if (listAdapter == null) {          return;      }             int totalHeight = 0;      for (int i = 0; i < listAdapter.getCount(); i++) {          View listItem = listAdapter.getView(i, null, listView);          if(listItem != null){              listItem.setLayoutParams(new LayoutParams(                      LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));              listItem.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);              totalHeight += listItem.getMeasuredHeight();          }      }      ViewGroup.LayoutParams params = listView.getLayoutParams();      params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1))               + listView.getPaddingTop() + listView.getPaddingBottom();      listView.setLayoutParams(params);  }    }
      
     

适配器

package com.bawei.day06_scrollview;import java.util.List;import android.content.Context;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.TextView;public class Adper extends BaseAdapter {    Context context;    List
     
       list;    public Adper(Context context, List
      
        list) {        // TODO Auto-generated constructor stub    this.context=context;    this.list=list;    }    public int getCount() {        // TODO Auto-generated method stub        return list.size();    }    public Object getItem(int position) {        // TODO Auto-generated method stub        return null;    }    public long getItemId(int position) {        // TODO Auto-generated method stub        return 0;    }    public View getView(int position, View convertView, ViewGroup parent) {        // TODO Auto-generated method stub        ViewHolder viewHolder;        if(convertView==null){        convertView=View.inflate(context, R.layout.listview, null);        viewHolder=new ViewHolder();        viewHolder.textView=(TextView) convertView.findViewById(R.id.text);        convertView.setTag(viewHolder);        }else{            viewHolder=(ViewHolder) convertView.getTag();        }        viewHolder.textView.setText(list.get(position));        return convertView;    }class ViewHolder{    TextView textView;}}
      
     

第二种方法

 自定义ListView，重载onMeasure()方法，设置全部显示

MainActivity.java

package com.bawei.day06;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.app.Activity;import android.view.Menu;import android.widget.ArrayAdapter;import android.widget.BaseAdapter;import android.widget.ListView;public class MainActivity extends Activity {    private ListView listView;    private List
     
       list;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        listView = (ListView) findViewById(R.id.listview);        list = new ArrayList
      
       ();            for (int i = 0; i < 200; i++) {            list.add(i+"");        }            ArrayAdapter
       
         adapter=new ArrayAdapter
        
         (this, android.R.layout.simple_expandable_list_item_1,list);                listView.setAdapter(adapter);    }    }
        
       
      
     

重写listview

ListViewForScrollView.java

package com.bawei.day06;import android.content.Context;import android.util.AttributeSet;import android.widget.ListView;public class ListViewForScrollView extends ListView {    public ListViewForScrollView(Context context, AttributeSet attrs) {        super(context, attrs);        // TODO Auto-generated constructor stub    }    @Override    /**     * 重写该方法，达到使ListView适应ScrollView的效果     */    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        int expandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2,                MeasureSpec.AT_MOST);        super.onMeasure(widthMeasureSpec, expandSpec);    }}