Android ListView 列表视图

列表显示的三个元素

ListView : 用来显示列表的View

Adapter : 适配器 用来把数据映射到ListView 上的中介

Data: 数据 将被映射的字符串,图片或者基本组件等资源

根据列表的适配器类型 可分为三种: ArrayAdapter,  SimpleAdapter ,SimpleCursorAdapter  .

ArrayAdapter  最简单 ,只能显示一行字

SimpleAdapter 扩充性好,可以自定义各种效果 ,

SimpleCursorAdapter  可以认为是对数据库的简单结合,可以把数据库的内容以列表的形式显示出来.

ArrayAdapter适配器  简单实例:

package com.app.listviewtest;import java.util.ArrayList;import java.util.List;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.widget.AdapterView;import android.widget.ArrayAdapter;import android.widget.ListView;import android.widget.Toast;public class MainActivity extends Activity {//创建ListView 对象private ListView mListView ;//添加数据List<Object> data;private List getData(){data = new ArrayList<Object>();data.add("Java");data.add("android");data.add("c");data.add("c++");return data; } @Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mListView = new  ListView(this);//获得组件//设置适配器mListView.setAdapter(new ArrayAdapter<Object>(this,android.R.layout.simple_expandable_list_item_1,getData()));//设置布局 显示listViewsetContentView(mListView);mListView.setOnItemClickListener( new AdapterView.OnItemClickListener() {@Overridepublic void onItemClick(AdapterView<?> parent, View view,int position, long id) {String text =data.get(position).toString();switch (position) {case 0 : Toast.makeText(getApplicationContext(),text+"被点击" , 0).show();break;case 1 :Toast.makeText(getApplicationContext(),text+"被点击" , 0).show();break;case 2 :Toast.makeText(getApplicationContext(),text+"被点击" , 0).show();break;case 3 :Toast.makeText(getApplicationContext(),text+"被点击" , 0).show();break;default :break;} }});}@Overridepublic 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;}}

 SimpleAdapter 的简单使用:

布局文件:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:orientation="horizontal" >        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="vertical" >            <ImageView                android:id="@+id/ImageView1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"              />            <TextView                android:id="@+id/TextView1"                android:layout_width="wrap_content"                android:layout_height="wrap_content"                />        </LinearLayout> </LinearLayout>

Java文件:

package com.app.listviewtest;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.ListActivity;import android.os.Bundle;import android.view.Window;import android.widget.SimpleAdapter;public class simpleAdapterActivity extends ListActivity {//数据源private List<Map<String,Object>> getData(){List <Map<String,Object>> list = new ArrayList<Map<String,Object>>();Map<String,Object> map = new HashMap<String, Object>();map.put("ImageView1", R.drawable.ic_launcher);map.put("TextView1", "图片一");list.add(map);map = new HashMap<String, Object>();map.put("ImageView1", R.drawable.ic_launcher);map.put("TextView1", "图片二");list.add(map);map = new HashMap<String, Object>();map.put("ImageView1", R.drawable.ic_launcher);map.put("TextView1", "图片3");list.add(map);map = new HashMap<String, Object>();map.put("ImageView1", R.drawable.ic_launcher);map.put("TextView1", "图片4");list.add(map);return list; }@Overrideprotected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //隐藏标题requestWindowFeature(Window.FEATURE_NO_TITLE);//设置 适配器  (上下文,数据,模板的资源ID,组件对应的资源,xml布局文件中组件的id)//public SimpleAdapter(Context context, List<? extends Map<String, ?>> data,int resource, String[] from, int[] to) {} SimpleAdapter adapter = new SimpleAdapter(getApplicationContext(), getData(),R.layout.simpleadapter_activity,new String[]{"ImageView1","TextView1"},new int[] {R.id.ImageView1,R.id.TextView1});setListAdapter(adapter);}}