listview多种类型条目显示

一、整个布局是一个listview实线的，而listview里面是嵌套了三种不同展示类型的item，平常只显示一种listview条目，我们会用到常用的四个方法，但是显示不同种类型item的时候，还需要实现两个重要的API（getViewTypeCount()、getItemViewType()）。
先看下主要的布局：

<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"     >     <ListView        android:id="@+id/lv"        android:layout_width="match_parent"        android:layout_height="wrap_content"         />   </RelativeLayout>

紧接着是三个不同类型的小条目的布局
item1`

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:padding="10dp"    android:orientation="horizontal"     >    <TextView         android:id="@+id/tv_1"        android:text="1"        android:paddingRight="5dp"        android:layout_centerVertical="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        />    <CheckBox         android:id="@+id/cb"        android:checked="false"        android:focusable="false"        android:layout_alignParentRight="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        /></RelativeLayout>

item2

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:padding="10dp"    android:orientation="vertical" >    <TextView         android:id="@+id/tv_2"        android:text="2"        android:paddingRight="5dp"        android:layout_centerVertical="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content"></TextView></LinearLayout>

item3

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:padding="10dp"    android:orientation="horizontal" >    <TextView         android:layout_gravity="center_vertical"        android:id="@+id/tv_3"        android:text="3"        android:layout_marginRight="5dp"        android:layout_centerVertical="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content">    </TextView>    <ImageView        android:id="@+id/iv_3"       android:layout_alignParentRight="true"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:src="@drawable/yapei" /></RelativeLayout>

下面就是核心的代码实现 了：

package com.example.listviewshow;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.ViewGroup;import android.widget.BaseAdapter;import android.widget.CheckBox;import android.widget.ImageView;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends Activity {    private ListView mListView;    private List<String> mList;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        mListView = (ListView) findViewById(R.id.lv);        mList = new ArrayList<String>();        for(int i = 0; i< 100; i++){            mList.add(i+"");        }        mListView.setAdapter(new MyAdapter());    }    public class MyAdapter extends BaseAdapter{        /**         * 三种类型item         */        final int TYPE_1 = 0;        final int TYPE_2 = 1;        final int TYPE_3 = 2;        @Override        public int getCount() {            // TODO Auto-generated method stub            return mList.size();        }        @Override        public Object getItem(int position) {            // TODO Auto-generated method stub            return mList.get(position);        }        @Override        public long getItemId(int position) {            // TODO Auto-generated method stub            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            // TODO Auto-generated method stub            viewHolder holder;            int type = getItemViewType(position);            if (convertView == null) {                holder = new viewHolder();                switch (type) {                case TYPE_1:                    convertView = View.inflate(getApplicationContext(), R.layout.item_1, null);                    holder.checkBox = (CheckBox) convertView.findViewById(R.id.cb);                    holder.textView = (TextView) convertView.findViewById(R.id.tv_1);                    break;                case TYPE_2:                    convertView = View.inflate(getApplicationContext(), R.layout.item_2, null);                    holder.textView = (TextView) convertView.findViewById(R.id.tv_2);                    break;                case TYPE_3:                    convertView = View.inflate(getApplicationContext(), R.layout.item_3, null);                    holder.textView = (TextView) convertView.findViewById(R.id.tv_3);                    holder.imageView = (ImageView) convertView.findViewById(R.id.iv_3);                    break;                default:                    break;                }                convertView.setTag(holder);            }else {                holder = (viewHolder) convertView.getTag();            }            holder.textView.setText(Integer.toString(position));            switch (type) {            case TYPE_1:                holder.checkBox.setChecked(true);                break;            case TYPE_2:                break;            case TYPE_3:                holder.imageView.setBackgroundResource(R.drawable.yapei);                break;            }            return convertView;        }        /**         * 返回条目的总数量         */        @Override        public int getViewTypeCount() {            // TODO Auto-generated method stub            return 3;        }        @Override        public int getItemViewType(int position) {            // TODO Auto-generated method stub             int p = position % 6;                if (p == 0)                    return TYPE_1;                else if (p < 3)                    return TYPE_2;                else if (p < 6)                    return TYPE_3;                else                    return TYPE_1;        }    }    static class viewHolder{        CheckBox checkBox;        TextView textView;        ImageView imageView;    }}