AndroidListView同一个item显示2列的实现方法(仿2列商品列表)
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;
}
}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);
}
}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>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>
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