Android(安卓)-- ListView(SimpleAdapter) 自定义适配器
16lz
2021-01-26
2. 代码
MainActivity
package com.himi;import java.util.ArrayList;import java.util.HashMap;import java.util.List;import java.util.Map;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.ListView;import android.widget.SimpleAdapter;import android.widget.Toast;public class MainActivity extends Activity {private SimpleAdapter adapter;// 声明适配器对象private ListView listView; // 声明列表视图对象private List < Map < String , Object >> list;// 声明列表容器public static MainActivity ma;@ Overridepublic void onCreate ( Bundle savedInstanceState ) {super.onCreate ( savedInstanceState );ma = this;// 实例化列表容器list = new ArrayList < Map < String , Object >> ( );listView = new ListView ( this );// 实例化列表视图// 实例一个列表数据容器Map < String , Object > map = new HashMap < String , Object > ( );// 往列表容器中添加数据map.put ( "item1_imageivew" , R.drawable.icon );map.put ( "item1_bigtv" , "BIGTV" );map.put ( "item1_smalltv" , "SMALLTV" );// 将列表数据添加到列表容器中list.add ( map );// 使用Android 提供的SimpleAdapter适配器,无法实现组件监听；// adapter = new SimpleAdapter(this, list, R.layout.main,// new String[] {"item1_imageivew", "item1_bigtv", "item1_smalltv" },// new int[] {R.id.iv, R.id.bigtv, R.id.smalltv });// --使用自定义适配器，可监听其ListView中每一项的事件监听MySimpleAdapter adapter = new MySimpleAdapter ( this , list , R.layout.main , new String [ ] { "item1_imageivew" , "item1_bigtv" , "item1_smalltv" } , new int [ ] { R.id.iv , R.id.bigtv , R.id.smalltv } );// 为列表视图设置适配器（将数据映射到列表视图中）listView.setAdapter ( adapter );listView.setOnItemClickListener ( new OnItemClickListener ( ) {@ Overridepublic void onItemClick ( AdapterView < ? > parent , View view , int position , long id ) {// TODO Auto-generated method stubToast.makeText ( MainActivity.this , "你点击的是第：" + position + "项" , Toast.LENGTH_SHORT ) .show ( );}} );// //显示列表视图this.setContentView ( listView );}}MySimpleAdapter
package com.himi;import java.util.List;import java.util.Map;import android.app.AlertDialog;import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import android.widget.CheckBox;import android.widget.CompoundButton;import android.widget.ImageView;import android.widget.TextView;import android.widget.CompoundButton.OnCheckedChangeListener;public class MySimpleAdapter extends BaseAdapter {//声明一个LayoutInflater对象（其作用是用来实例化布局）private LayoutInflater mInflater;private List < Map < String , Object >> list;//声明List容器对象private int layoutID; //声明布局IDprivate String flag[];//声明ListView项中所有组件映射索引private int ItemIDs[];//声明ListView项中所有组件ID数组public MySimpleAdapter ( Context context , List < Map < String , Object >> list , int layoutID , String flag[] , int ItemIDs[] ) {//利用构造来实例化成员变量对象this.mInflater = LayoutInflater.from ( context );this.list = list;this.layoutID = layoutID;this.flag = flag;this.ItemIDs = ItemIDs;}@ Overridepublic int getCount ( ) {return list.size ( );//返回ListView项的长度}@ Overridepublic Object getItem ( int arg0 ) {return 0;}@ Overridepublic long getItemId ( int arg0 ) {return 0;}//实例化布局与组件以及设置组件数据//getView(int position, View convertView, ViewGroup parent)//第一个参数：绘制的行数//第二个参数：绘制的视图这里指的是ListView中每一项的布局//第三个参数：view的合集，这里不需要@ Overridepublic View getView ( int position , View convertView , ViewGroup parent ) {//将布局通过mInflater对象实例化为一个viewconvertView = mInflater.inflate ( layoutID , null );for ( int i = 0 ; i < flag.length ; i ++ ) {//遍历每一项的所有组件//每个组件都做匹配判断，得到组件的正确类型if (convertView.findViewById ( ItemIDs [ i ] ) instanceof ImageView) {//findViewById()函数作用是实例化布局中的组件//当组件为ImageView类型，则为其实例化一个ImageView对象ImageView iv = ( ImageView ) convertView .findViewById ( ItemIDs [ i ] );//为其组件设置数据iv.setBackgroundResource ( ( Integer ) list .get ( position ) .get ( flag [ i ] ) );}else if (convertView.findViewById ( ItemIDs [ i ] ) instanceof TextView) {//当组件为TextView类型，则为其实例化一个TextView对象TextView tv = ( TextView ) convertView .findViewById ( ItemIDs [ i ] );//为其组件设置数据tv.setText ( ( String ) list.get ( position ) .get ( flag [ i ] ) );}}//为按钮设置监听( ( Button ) convertView.findViewById ( R.id.btn ) ) .setOnClickListener ( new View.OnClickListener ( ) { @ Override public void onClick ( View v ) { //这里弹出一个对话框，后文有详细讲述 new AlertDialog.Builder ( MainActivity.ma ) .setTitle ( "自定义SimpleAdapter" ) .setMessage ( "按钮成功触发监听事件！" ) .show ( ); } } );//为复选框设置监听( ( CheckBox ) convertView.findViewById ( R.id.cb ) ) .setOnCheckedChangeListener ( new OnCheckedChangeListener ( ) { @ Override public void onCheckedChanged ( CompoundButton buttonView , boolean isChecked ) { //这里弹出一个对话框，后文有详细讲述 new AlertDialog.Builder ( MainActivity.ma ) .setTitle ( "自定义SimpleAdapter" ) .setMessage ( "CheckBox成功触发状态改变监听事件！" ) .show ( ); } } );return convertView;}}Layout
<?xml version="1.0" encoding="utf-8"?>
转载于:https://www.cnblogs.com/SM-t/p/4302920.html
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