ListView自定义adapter处理多事件

使用过ListView 的开发人员都知道，ListView 在一般情况下只能对每条记录设置一个监听事件。如果想在其中添加多个事件，就需要自定义Adapter 。

 

下面介绍一下如何自定义adapter 以及如何在一个Item 中绑定多个事件。

这里我们需要两个XML 文件、两个java 类。分别是存放ListView 的XML 、ListViewItem 的XML 、Activity 类和Adapter 类。

 

首先说说两个XML 文件。

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:padding= "10dip" 
    android:orientation="vertical" >

    <ListView 
        android:id="@id/android:list" 
        android:layout_width = "fill_parent" 
        android:layout_height = "fill_parent" /> 

</LinearLayout>

 

注意：这里的ListView 中id 使用了android 自定义的： @id/android:list

 

lvItem.xml

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:descendantFocusability="blocksDescendants"
    android:padding="5dip" >

    <ImageView
        android:id="@+id/ItemImage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="5dip" />

    <ImageButton
        android:id="@+id/ItemCloseWin"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/ItemWinName"
        android:layout_alignTop="@+id/ItemWinName"
        android:layout_alignParentRight="true"
        android:background="#e0000000"
        android:focusable="false"
        android:gravity="left|center_vertical"
        android:src="@android:drawable/ic_menu_close_clear_cancel" />

    <ImageButton 
        android:id="@+id/ItemEmail"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/ItemWinName"
        android:layout_alignTop="@id/ItemWinName"
        android:layout_toLeftOf="@id/ItemCloseWin"
        android:background="#e0000000"
        android:focusable="false"
        android:gravity="left|center_vertical"
        android:src="@android:drawable/ic_dialog_email" />
    
    <TextView
        android:id="@+id/ItemWinName"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@id/ItemImage"
        android:layout_alignTop="@id/ItemImage"
        android:layout_toLeftOf="@id/ItemEmail"
        android:layout_toRightOf="@id/ItemImage"
        android:gravity="left|center_vertical"
        android:text="title"
        android:textSize="20dip" />

</RelativeLayout>

 

 

接下来看看Activity

 

package cn.mutil;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
/**
 * ListView item 多事件Activity
 * @author lihua
 *
 */
public class LvWithButtonActivity extends ListActivity {

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

		// 关联Layout中的ListView
		ListView vncListView = (ListView) findViewById(android.R.id.list);

		// 生成动态数组，加入数据
		ArrayList<HashMap<String, Object>> remoteWindowItem = new ArrayList<HashMap<String, Object>>();
		for (int i = 0; i < 10; i++) {
			HashMap<String, Object> map = new HashMap<String, Object>();
			map.put("ItemImage", R.drawable.ic_launcher); // 图像资源的ID
			map.put("ItemWinName", "Window ID " + i);
			map.put("ItemEmail", android.R.drawable.ic_dialog_email);
			map.put("ItemCloseWin",	android.R.drawable.ic_menu_close_clear_cancel);
			remoteWindowItem.add(map);
		}

		// 生成适配器的Item和动态数组对应的元素
		LvButtonAdapter listItemAdapter = new LvButtonAdapter(this,
				remoteWindowItem, // 数据源
				R.layout.lvitem, // ListItem对应的XML
				// 动态数组与ImageItem对应的子项
				new String[] { "ItemImage", "ItemWinName","ItemEmail", "ItemCloseWin" },
				// ImageItem的XML文件里面的一个ImageView,两个TextView ID
				new int[] { R.id.ItemImage, R.id.ItemWinName, R.id.ItemEmail, R.id.ItemCloseWin });

		vncListView.setAdapter(listItemAdapter);
		
		/**
		 * 设置整个Item被点击的事件
		 * 该事件在其他有事件的组件未被点击时触发
		 */
		vncListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> adapter, View view, 
					int position,long arg3) {
				
				TextView content = (TextView)view.findViewById(R.id.ItemWinName);
				Toast.makeText(LvWithButtonActivity.this, content.getText().toString() , Toast.LENGTH_SHORT).show();
			}
			
		});
	}

	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		super.onListItemClick(l, v, position, id);
		l.getItemAtPosition(position);
	}

}

 

最后一个也是最重要的一个，自定义adapter

 

package cn.mutil;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

public class LvButtonAdapter extends BaseAdapter {

	private class ButtonViewHolder {
		ImageView appIcon;
		TextView appName;
		ImageButton buttonEmail;
		ImageButton buttonClose;
	}

	private ArrayList<HashMap<String, Object>> mAppList;//用于存放传递过来显示于ListView中的 数据
	private LayoutInflater mInflater;
	private Context mContext;
	private String[] keyString;
	private int[] valueViewID;
	private ButtonViewHolder holder;

	public LvButtonAdapter(Context c,//上下文
			ArrayList<HashMap<String, Object>> appList,//绑定数据 
			int resource00000,//ListView行记录layout
			String[] from, 
			int[] to) {
		mAppList = appList;
		mContext = c;
		mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
		keyString = new String[from.length];
		valueViewID = new int[to.length];
		System.arraycopy(from, 0, keyString, 0, from.length);
		System.arraycopy(to, 0, valueViewID, 0, to.length);
	}

	@Override
	public int getCount() {
		return mAppList.size();
	}

	@Override
	public Object getItem(int position) {
		return mAppList.get(position);
	}

	@Override
	public long getItemId(int position) {
		return position;
	}
	/**
	 * 删除数据集中的值
	 * @param position
	 */
	public void removeItem(int position) {
		mAppList.remove(position);
		this.notifyDataSetChanged();
	}
	
	/**
	 * 改变数据集中的值
	 * @param position
	 * @param map
	 */
	public void changeItem(int position,HashMap<String, Object> map){
		mAppList.remove(position);
		mAppList.add(position, map);
		this.notifyDataSetChanged();
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		if (convertView != null) {
			holder = (ButtonViewHolder) convertView.getTag();
		} else {
			convertView = mInflater.inflate(R.layout.lvitem, null);
			holder = new ButtonViewHolder();
			holder.appIcon = (ImageView) convertView
					.findViewById(valueViewID[0]);//可以将valueViewID[0]替换成R.id.xxx
			holder.appName = (TextView) convertView
					.findViewById(valueViewID[1]);
			holder.buttonEmail = (ImageButton) convertView
					.findViewById(valueViewID[2]);
			holder.buttonClose = (ImageButton) convertView
					.findViewById(valueViewID[3]);
			convertView.setTag(holder);
		}

		HashMap<String, Object> appInfo = mAppList.get(position);
		if (appInfo != null) {
			String aname = (String) appInfo.get(keyString[1]);
			int mid = (Integer) appInfo.get(keyString[0]);
			int eid = (Integer) appInfo.get(keyString[2]);
			int bid = (Integer) appInfo.get(keyString[3]);
			
			holder.appName.setText(aname);
			holder.appName.setOnClickListener(new LvButtonListener(position));
			holder.appIcon.setImageDrawable(holder.appIcon.getResources().getDrawable(mid));			
			holder.buttonEmail.setImageDrawable(holder.buttonEmail.getResources().getDrawable(eid));
			holder.buttonEmail.setOnClickListener(new LvButtonListener(position));			
			holder.buttonClose.setImageDrawable(holder.buttonClose.getResources().getDrawable(bid));
			holder.buttonClose.setOnClickListener(new LvButtonListener(position));
		}
		return convertView;
	}
	
	/**
	 * 按钮事件监听
	 * @author lihua
	 *
	 */
	private class LvButtonListener implements View.OnClickListener {
		private int position;

		LvButtonListener(int pos) {
			position = pos;
		}

		@Override
		public void onClick(View v) {
			int vid = v.getId();
			
			HashMap<String, Object> curMap = (HashMap<String, Object>)getItem(position);		
			
			if (vid == holder.buttonClose.getId()){	//删除一行记录
				
				Toast.makeText(mContext,"position:"+position+",data is being Deleted", Toast.LENGTH_LONG).show();
				removeItem(position);
				//可以在这里操作数据库或更新服务端数据
				
			}else if(vid == holder.buttonEmail.getId()){//发送邮件
				
				Toast.makeText(mContext, "position:"+position+",sending email to xxx!", 
						Toast.LENGTH_SHORT).show();
				//可以在这里操作数据库或更新服务端数据
				
			}else if(vid == holder.appName.getId()){//设置名称
				
				Toast.makeText(mContext, "position is "+position+", appName:"+curMap.get("ItemWinName").toString(), 
						Toast.LENGTH_SHORT).show();
				curMap.put("ItemWinName", System.currentTimeMillis()+"");
				changeItem(position,curMap);
				//可以在这里操作数据库或更新服务端数据
				
			}
		}
	}

}