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Android实战开发中,ListView控件用途十分广泛,各种自定义控件多种多样。当项目要求实现一个2列的商品列表形式的界面,我们首先肯定想到用ListView,然后我们可以使用百度的自定义ListView,当然也可以用以下方法实现。 Android实战开发中ListView同一个item显示2列的实现方法其实主要不在于ListView控件本身,是在于ListView的适配器Adapter的自定义方法,其实方法很简单,直接上代码就可以简而易懂了。
一、首先看最主要的Adapter代码:
- package com.tongleer.demo.android.listview;
- import java.util.ArrayList;
- import java.util.List;
- import com.tongleer.demo.android.R;
- import android.content.Context;
- import android.view.LayoutInflater;
- import android.view.View;
- import android.view.ViewGroup;
- import android.view.View.OnClickListener;
- import android.widget.BaseAdapter;
- import android.widget.TextView;
- import android.widget.Toast;
- /**
- * 2列ListView的适配器
- * @author tongleer.com
- *
- */
- public class MyAdapter extends BaseAdapter{
- protected Context context;
- protected LayoutInflater inflater;
- protected int resource;
- protected ArrayList<String> list;
- public MyAdapter(Context context, int resource, ArrayList<String> list){
- inflater = LayoutInflater.from(context);
- this.context = context;
- this.resource = resource;
- if(list==null){
- this.list=new ArrayList<>();
- }else{
- this.list = list;
- }
- }
- @Override
- public int getCount() {
- if(list.size()%2>0) {
- return list.size()/2+1;
- } else {
- return list.size()/2;
- }
- }
- @Override
- public Object getItem(int position) {
- return list.get(position);
- }
- @Override
- public long getItemId(int position) {
- return position;
- }
- @Override
- public View getView(int position, View convertView, ViewGroup parent) {
- ViewHolder vh = null;
- if (convertView == null ) {
- convertView = inflater.inflate(resource, null);
- vh = new ViewHolder();
- vh.tv1=(TextView)convertView.findViewById(R.id.tv1);
- vh.tv2=(TextView)convertView.findViewById(R.id.tv2);
- convertView.setTag(vh);
- }else {
- vh = (ViewHolder)convertView.getTag();
- }
- int distance = list.size() - position*2;
- int cellCount = distance >= 2? 2:distance;
- final List<String> itemList = list.subList(position*2,position*2+cellCount);
- if (itemList.size() >0) {
- vh.tv1.setText(itemList.get(0));
- vh.tv1.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- Toast.makeText(context, itemList.get(0), Toast.LENGTH_SHORT).show();
- }
- });
- if (itemList.size() >1){
- vh.tv2.setVisibility(View.VISIBLE);
- vh.tv2.setText(itemList.get(1));
- vh.tv2.setOnClickListener(new OnClickListener() {
- @Override
- public void onClick(View v) {
- Toast.makeText(context, itemList.get(1), Toast.LENGTH_SHORT).show();
- }
- });
- }else{
- vh.tv2.setVisibility(View.INVISIBLE);
- }
- }
- return convertView;
- }
- /**
- * 封装ListView中item控件以优化ListView
- * @author tongleer
- *
- */
- public static class ViewHolder{
- TextView tv1;
- TextView tv2;
- }
- }
复制代码 二、然后看Activity和布局的代码:
1、Activity:
- package com.tongleer.demo.android.listview;
- import java.util.ArrayList;
- import android.app.Activity;
- import android.os.Bundle;
- import android.widget.ListView;
- import com.tongleer.demo.android.R;
- /**
- * 实现2列的ListView
- * @author tongleer.com
- *
- */
- public class MainActivity extends Activity{
- @Override
- protected void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.activity_main);
- ListView lv = (ListView)findViewById(R.id.lv);
- ArrayList<String> list = new ArrayList<String>();
- for (int i = 0; i < 21; i++) {
- list.add("测试:"+i);
- }
- MyAdapter adapter = new MyAdapter(this,R.layout.moban,list);
- lv.setAdapter(adapter);
- }
- }
复制代码 2、moban.xml布局:
- <?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="horizontal" >
- <TextView
- android:id="@+id/tv1"
- android:gravity="center"
- android:layout_weight="1"
- android:layout_width="0dp"
- android:layout_height="50dp"
- android:text="tv1" />
- <TextView
- android:id="@+id/tv2"
- android:gravity="center"
- android:layout_weight="1"
- android:layout_width="0dp"
- android:layout_height="50dp"
- android:text="tv2" />
- </LinearLayout>
复制代码 3、activity_main_xml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"
- tools:context="com.tongleer.demo.android.listview.MainActivity" >
- <ListView
- android:id="@+id/lv"
- android:layout_width="match_parent"
- android:layout_height="match_parent" >
- </ListView>
- </RelativeLayout>
复制代码
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