Listview不同项问题

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这里主要介绍下一个Listview怎么显示不同类型的条目的问题。

方法一：

最简单就是在getView里面判断position再分别inflate出不同的条目。

例子：创建45个不同的条目，在第一个和第20个是button，其他是Textview。

见代码：

</pre><pre name="code" class="html"><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="com.example.listviewtest.MainActivity" >    <ListView        android:id="@+id/listview"        android:layout_width="fill_parent"        android:layout_height="fill_parent" >    </ListView></RelativeLayout>

<?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:orientation="vertical" >    <Button        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="按钮" /></LinearLayout>

<?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:orientation="vertical" >    <TextView        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:gravity="center"        android:text="文本" /></LinearLayout>

package com.example.listviewtest;import android.support.v7.app.ActionBarActivity;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.ListView;public class MainActivity extends ActionBarActivity {private ListView listView;private final int MAX_SIZE = 45;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView) this.findViewById(R.id.listview);listView.setAdapter(new MyAdapter());}private class MyAdapter extends BaseAdapter {@Overridepublic int getCount() {// TODO Auto-generated method stubreturn MAX_SIZE;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {if (position == 0 || position == 20) {convertView = getLayoutInflater().inflate(R.layout.button_item,null);} else {convertView = getLayoutInflater().inflate(R.layout.textview_item, null);}return convertView;}}}

这里没有做缓存优化。当然上面的方法是可以行通的。

方法二：

运用getViewTypeCount和getItemViewType方法，第一个方法返回有多少种类型，第二个方法为不同位置的Item设置type。

下面看修改后的代码（缓存已经写好了）

package com.example.listviewtest;import android.support.v7.app.ActionBarActivity;import android.R.integer;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.ListView;import android.widget.TextView;public class MainActivity extends ActionBarActivity {private ListView listView;private final int MAX_SIZE = 45;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);listView = (ListView) this.findViewById(R.id.listview);listView.setAdapter(new MyAdapter());}private class MyAdapter extends BaseAdapter {@Overridepublic int getCount() {// TODO Auto-generated method stubreturn MAX_SIZE;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn null;}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn 0;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {int type = getItemViewType(position);if (convertView == null) {if (type == 0) {// 按钮BtViewHolder btViewHolder = new BtViewHolder();convertView = getLayoutInflater().inflate(R.layout.button_item, null);btViewHolder.bt = (Button) convertView.findViewById(R.id.bt);convertView.setTag(btViewHolder);} else {TvViewHolder tvViewHolder = new TvViewHolder();convertView = getLayoutInflater().inflate(R.layout.textview_item, null);tvViewHolder.tv = (TextView) convertView.findViewById(R.id.tv);convertView.setTag(tvViewHolder);}}if (type == 0) {BtViewHolder btViewHolder = (BtViewHolder) convertView.getTag();if (btViewHolder != null) {btViewHolder.bt.setText(position + "");}} else {TvViewHolder tvViewHolder = (TvViewHolder) convertView.getTag();if (tvViewHolder != null) {tvViewHolder.tv.setText(position + "");}}return convertView;}@Overridepublic int getViewTypeCount() {// TODO Auto-generated method stubreturn 2;}@Overridepublic int getItemViewType(int position) {if (position == 0 || position == 20)return 0;return 1;}}private class BtViewHolder {public Button bt;}private class TvViewHolder {public TextView tv;}}

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