淘宝(阿里百川)手机客户端开发日记第四篇 自定义ListView详解

我们知道，如果采用官方的ListView,实现的功能在很多时候，并不能满足自己的业务需求，比如在设计到复杂的列表的时候，这一节，我们就开始动手自己实现自定义的ListView.

在上一节中，我们采用了固定的ListView中的数据集，我们对其进行改造；我们重新设置一个ListView的一个模板

template_sort.xml

<?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/tvSortID"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:text="1"
        android:textSize="24sp" />

    <TextView
        android:id="@+id/tvSortName"
        android:layout_width="wrap_content"
        android:layout_height="25dp"
        android:layout_marginLeft="10dp"
        android:text="内容"
        android:textSize="24sp" />

</LinearLayout>

我们还需要自己添加一个业务bean,起名叫PSort类

package com.example.bean;

public class PSort {
	//分类ID
　　　　	private int id;
　　　　 //分类名称　　 	private String name;

	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
}

如果自定义ListView,我们还需要自己定义一个适配器，这里我起名叫MySortAdapter

package com.example.adapter;

import java.util.List;

import android.content.Context;
import android.content.Intent;
import android.os.Handler;
import android.os.Message;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import android.widget.Toast;

import com.example.bean.PSort;
import com.example.slidepaneldemo.R;

public class MySortAdapter extends BaseAdapter {

	private List<PSort> list;

	private Context context;
　　　　 //更新主框架的UI　　	private Handler mHandle;

	public MySortAdapter(List<PSort> list,Context context,Handler mHandle)
	{
		this.list= list;
		this.context = context;
		this.mHandle = mHandle;
	}

	@Override
	public int getCount() {

		return list.size();
	}

	@Override
	public PSort getItem(int position) {

		return list.get(position);
	}

	@Override
	public long getItemId(int position) {

		return position;
	}

	@Override
	public View getView(final int position, View convertView, final ViewGroup parent)  {
		MyViewHolder myHolder;
		if(convertView == null)
		{
			LayoutInflater inflater = LayoutInflater.from(context);
			convertView = inflater.inflate(R.layout.template_sort, null);

			myHolder = new MyViewHolder();
			myHolder.tvSortID = (TextView) convertView.findViewById(R.id.tvSortID);
			myHolder.tvSortName = (TextView) convertView.findViewById(R.id.tvSortName);
		}
		else {
			myHolder = (MyViewHolder) convertView.getTag();
		}
		final PSort pSort = list.get(position);
		myHolder.tvSortID.setText(String.valueOf(pSort.getId()));
		myHolder.tvSortName.setText(pSort.getName());
		myHolder.tvSortName.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View view) {
　　　　　　　　　　　　　　　　　　　// 点击一个Item时，向主框架发送异步信息，来更新数据
       				Message msg = new Message();
				msg.what = position;
				mHandle.sendMessage(msg);

			}
		});
		return convertView;
	}

	static class MyViewHolder
	{
		public  TextView tvSortID;
		public  TextView tvSortName;
	}

}

主框架代码部分：MainActivity.java

package com.example.slidepaneldemo;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SlidingPaneLayout;
import android.support.v4.widget.SlidingPaneLayout.PanelSlideListener;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import com.example.adapter.MySortAdapter;
import com.example.bean.PSort;

public class MainActivity extends Activity implements PanelSlideListener {

	Button button1;
	SlidingPaneLayout slidepanel;
	ListView lvItems;
	TextView textView1;
	List<PSort> list;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		button1 = (Button)findViewById(R.id.button1);
		slidepanel = (SlidingPaneLayout)findViewById(R.id.slidepanel);
		lvItems = (ListView)findViewById(R.id.lvItems);
		textView1 = (TextView)findViewById(R.id.textView1);

		list = new ArrayList<PSort>();
		for(int i=0;i<5;i++)
		{
			PSort p = new PSort();
			p.setId(i+1);
			p.setName("Sort" + String.valueOf(i+1));
			list.add(p);
		}

		lvItems.setAdapter(new MySortAdapter(list,this,handler));

		button1.setOnClickListener(new OnClickListener() {

			@Override
			public void onClick(View arg0) {
				if(!slidepanel.isOpen())
				{
					slidepanel.openPane();
				}
				else
				{
					slidepanel.closePane();
				}
			}
		});
	}

	Handler handler = new Handler()
	{
		@Override
		public void handleMessage(Message msg) {
			//Toast.makeText(MainActivity.this, "Id:" + msg.what, 1).show();

			textView1.setText(list.get(msg.what).getName());
			slidepanel.closePane();

		}
	};

	@Override
	public void onPanelClosed(View arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onPanelOpened(View arg0) {
		// TODO Auto-generated method stub

	}

	@Override
	public void onPanelSlide(View arg0, float arg1) {
		// TODO Auto-generated method stub

	}

}

这个时候，当我们点击左边分类的时候，就可以更新右边的数据啦！

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