Android ListView使用详解
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最近在做android上有关采用ListView进行信息显示的开发工作,发现有很多实现的方法,不过思想基本是一致的。网上大部分的测试程序采用的是数组存储要显示的信息,但是为了更好地对信息进行管理,我采用的是用对象来存储信息方式。同时我要对item点击事件进行相应,中间遇到了一些困惑,不过都解决了,这里把完整代码分享一下:
首先,list布局文件:
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- xmlns:tools="http://schemas.android.com/tools"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="vertical"
- tools:context=".ListTestActivity" >
- <ListView
- android:id="@+id/listView"
- android:layout_width="match_parent"
- android:layout_height="wrap_content" >
- </ListView>
- </LinearLayout>
- <?xml version="1.0" encoding="utf-8"?>
- <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
- android:layout_width="fill_parent"
- android:layout_height="fill_parent"
- android:orientation="horizontal" >
- <ImageView
- android:id="@+id/img"
- android:layout_width="71dp"
- android:layout_height="71dp"
- android:src="@drawable/ic_launcher" />
- <LinearLayout
- android:layout_width="wrap_content"
- android:layout_height="wrap_content"
- android:orientation="vertical" >
- <TextView
- android:id="@+id/title"
- android:layout_width="242dp"
- android:layout_height="wrap_content"
- android:text="222"
- android:textAppearance="?android:attr/textAppearanceMedium" />
- <TextView
- android:id="@+id/info"
- android:layout_width="match_parent"
- android:layout_height="47dp"
- android:text="11" />
- </LinearLayout>
- </LinearLayout>
- package my.test.ListTest;
- import java.util.ArrayList;
- import java.util.List;
- import android.annotation.SuppressLint;
- import android.app.Activity;
- import android.content.Context;
- import android.os.Bundle;
- import android.view.ContextMenu;
- import android.view.LayoutInflater;
- import android.view.MenuItem;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.ContextMenu.ContextMenuInfo;
- import android.view.View.OnCreateContextMenuListener;
- import android.widget.AdapterView;
- import android.widget.BaseAdapter;
- import android.widget.ImageView;
- import android.widget.ListView;
- import android.widget.TextView;
- import android.widget.Toast;
- import android.widget.AdapterView.OnItemClickListener;
- @SuppressLint("ParserError")
- public class ListTestActivity extends Activity {
- ListView listView; //声明一个ListView对象
- private List<info> mlistInfo = new ArrayList<info>(); //声明一个list,动态存储要显示的信息
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
- listView=(ListView)this.findViewById(R.id.listView); //将listView与布局对象关联
- setInfo(); //给信息赋值函数,用来测试
- listView.setAdapter(new ListViewAdapter(mlistInfo));
- //处理Item的点击事件
- listView.setOnItemClickListener(new OnItemClickListener(){
- public void onItemClick(AdapterView<?> parent, View view,int position, long id) {
- info getObject = mlistInfo.get(position); //通过position获取所点击的对象
- int infoId = getObject.getId(); //获取信息id
- String infoTitle = getObject.getTitle(); //获取信息标题
- String infoDetails = getObject.getDetails(); //获取信息详情
- //Toast显示测试
- Toast.makeText(ListTestActivity.this, "信息ID:"+infoId,Toast.LENGTH_SHORT).show();
- }
- });
- //长按菜单显示
- listView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
- public void onCreateContextMenu(ContextMenu conMenu, View view , ContextMenuInfo info) {
- conMenu.setHeaderTitle("菜单");
- conMenu.add(0, 0, 0, "条目一");
- conMenu.add(0, 1, 1, "条目二");
- conMenu.add(0, 2, 2, "条目三");
- }
- });
- }
- //长按菜单处理函数
- public boolean onContextItemSelected(MenuItem aItem) {
- AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)aItem.getMenuInfo();
- switch (aItem.getItemId()) {
- case 0:
- Toast.makeText(ListTestActivity.this, "你点击了条目一",Toast.LENGTH_SHORT).show();
- return true;
- case 1:
- Toast.makeText(ListTestActivity.this, "你点击了条目二",Toast.LENGTH_SHORT).show();
- return true;
- case 2:
- Toast.makeText(ListTestActivity.this, "你点击了条目三",Toast.LENGTH_SHORT).show();
- return true;
- }
- return false;
- }
- public class ListViewAdapter extends BaseAdapter {
- View[] itemViews;
- public ListViewAdapter(List<info> mlistInfo) {
- // TODO Auto-generated constructor stub
- itemViews = new View[mlistInfo.size()];
- for(int i=0;i<mlistInfo.size();i++){
- info getInfo=(info)mlistInfo.get(i); //获取第i个对象
- //调用makeItemView,实例化一个Item
- itemViews[i]=makeItemView(
- getInfo.getTitle(), getInfo.getDetails(),getInfo.getAvatar()
- );
- }
- }
- public int getCount() {
- return itemViews.length;
- }
- public View getItem(int position) {
- return itemViews[position];
- }
- public long getItemId(int position) {
- return position;
- }
- //绘制Item的函数
- private View makeItemView(String strTitle, String strText, int resId) {
- LayoutInflater inflater = (LayoutInflater) ListTestActivity.this
- .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
- // 使用View的对象itemView与R.layout.item关联
- View itemView = inflater.inflate(R.layout.item, null);
- // 通过findViewById()方法实例R.layout.item内各组件
- TextView title = (TextView) itemView.findViewById(R.id.title);
- title.setText(strTitle); //填入相应的值
- TextView text = (TextView) itemView.findViewById(R.id.info);
- text.setText(strText);
- ImageView image = (ImageView) itemView.findViewById(R.id.img);
- image.setImageResource(resId);
- return itemView;
- }
- public View getView(int position, View convertView, ViewGroup parent) {
- if (convertView == null)
- return itemViews[position];
- return convertView;
- }
- }
- public void setInfo(){
- mlistInfo.clear();
- int i=0;
- while(i<10){
- info information = new info();
- information.setId(1000+i);
- information.setTitle("标题"+i);
- information.setDetails("详细信息"+i);
- information.setAvatar(R.drawable.i2);
- mlistInfo.add(information); //将新的info对象加入到信息列表中
- i++;
- }
- }
- }
- package my.test.ListTest;
- public class info {
- private int id; //信息ID
- private String title; //信息标题
- private String details; //详细信息
- private int avatar; //图片ID
- //信息ID处理函数
- public void setId(int id) {
- this.id = id;
- }
- public int getId() {
- return id;
- }
- //标题
- public void setTitle(String title) {
- this.title = title;
- }
- public String getTitle() {
- return title;
- }
- //详细信息
- public void setDetails(String info) {
- this.details = info;
- }
- public String getDetails() {
- return details;
- }
- //图片
- public void setAvatar(int avatar) {
- this.avatar = avatar;
- }
- public int getAvatar() {
- return avatar;
- }
- }
贴上效果图:
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