我们一般编写listView的时候顺序是这样的：
- 需要展示的数据集List
- 为这个数据集编写一个ListView
- 为这个ListView编写一个Adapter，一般继承自BaseAdapter
- 在BaseAdapter内部编写一个ViewHolder类，对应ListView里面的item控件，提高控件的查询效率
1. 在activity_main.xml中添加listview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" >
<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</RelativeLayout>
2. 添加listview的条目布局
<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"
android:padding="10dp" >
<TextView
android:id="@+id/titleTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:singleLine="true"
android:text="Android新技能"
android:textColor="#444"
android:textSize="16sp" />
<TextView
android:id="@+id/descTv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/titleTv"
android:layout_marginTop="10dp"
android:maxLines="2"
android:minLines="1"
android:text="Android为ListView和GridView打造万能适配器"
android:textColor="#898989"
android:textSize="16sp" />
<TextView
android:id="@+id/timeTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/descTv"
android:layout_marginTop="10dp"
android:paddingTop="3dp"
android:text="2015-05-04"
android:textColor="#898989"
android:textSize="12sp" />
<TextView
android:id="@+id/phoneTv"
android:layout_width="wrap_content"
android:layout_height="30dp"
android:layout_alignParentRight="true"
android:layout_below="@+id/descTv"
android:layout_marginTop="10dp"
android:background="#2ED667"
android:drawableLeft="@drawable/phone"
android:drawablePadding="5dp"
android:gravity="center"
android:padding="2dp"
android:text="10086"
android:textColor="#ffffff"
android:textSize="12sp" />
</RelativeLayout>
3. 添加bean对象
package com.wxyass.listviewadapter;
/**
* Created by smyhvae on 2015/5/4.
*/
public class Bean {
private String title;
private String desc;
private String time;
private String phone;
public Bean() {
}
public Bean(String title, String desc, String time, String phone) {
this.title = title;
this.desc = desc;
this.time = time;
this.phone = phone;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getDesc() {
return desc;
}
public void setDesc(String desc) {
this.desc = desc;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
}
4. 添加自定义适配器MyAdapter.java继承自BaseAdapte
package com.wxyass.listviewadapter;
import java.util.List;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
/**
* Created by smyhvae on 2015/5/4.
*/
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;
private List<Bean> mDatas;
//MyAdapter需要一个Context，通过Context获得Layout.inflater，然后通过inflater加载item的布局
public MyAdapter(Context context, List<Bean> datas) {
mInflater = LayoutInflater.from(context);
mDatas = datas;
}
//返回数据集的长度
@Override
public int getCount() {
return mDatas.size();
}
@Override
public Object getItem(int position) {
return mDatas.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
//这个方法才是重点，我们要为它编写一个ViewHolder
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.item_listview, parent, false); //加载布局
holder = new ViewHolder();
holder.titleTv = (TextView) convertView.findViewById(R.id.titleTv);
holder.descTv = (TextView) convertView.findViewById(R.id.descTv);
holder.timeTv = (TextView) convertView.findViewById(R.id.timeTv);
holder.phoneTv = (TextView) convertView.findViewById(R.id.phoneTv);
convertView.setTag(holder);
} else { //else里面说明，convertView已经被复用了，说明convertView中已经设置过tag了，即holder
holder = (ViewHolder) convertView.getTag();
}
Bean bean = mDatas.get(position);
holder.titleTv.setText(bean.getTitle());
holder.descTv.setText(bean.getDesc());
holder.timeTv.setText(bean.getTime());
holder.phoneTv.setText(bean.getPhone());
return convertView;
}
//这个ViewHolder只能服务于当前这个特定的adapter，因为ViewHolder里会指定item的控件，不同的ListView，item可能不同，所以ViewHolder写成一个私有的类
private class ViewHolder {
TextView titleTv;
TextView descTv;
TextView timeTv;
TextView phoneTv;
}
}
5. 修改MainActivity.java中的代码
package com.wxyass.listviewadapter;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
public class MainActivity extends Activity {
private ListView listView;
private List<Bean> mDatas;
private MyAdapter mAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initView();
initData();
}
//方法：初始化View
private void initView() {
listView = (ListView) findViewById(R.id.listView);
}
//方法；初始化Data
private void initData() {
mDatas = new ArrayList<Bean>();
//将数据装到集合中去
Bean bean = new Bean("Android新技能1", "Android为ListView和GridView打造万能适配器", "2015-05-04", "10086");
mDatas.add(bean);
bean = new Bean("Android新技能2", "Android为ListView和GridView打造万能适配器", "2015-05-04", "10086");
mDatas.add(bean);
bean = new Bean("Android新技能3", "Android为ListView和GridView打造万能适配器", "2015-05-04", "10086");
mDatas.add(bean);
bean = new Bean("Android新技能4", "Android为ListView和GridView打造万能适配器", "2015-05-04", "10086");
mDatas.add(bean);
//为数据绑定适配器
mAdapter = new MyAdapter(this,mDatas);
listView.setAdapter(mAdapter);
}
}
成功显示:
