Android的ListView多选删除Demo

这篇博客介绍了作者在实现Android ListView多选删除功能时遇到的问题及解决方案。在布局方面,由于item中的控件导致整体点击事件无法响应,通过添加`android:descendantFocusability="blocksDescendants"`属性解决了问题,但仍有checkbox点击事件与list点击事件冲突,最终通过设置`android:clickable="false"`解决。博客提供了涉及的bean类、Adapter和MainActivity的源码,并给出了GitHub链接供读者参考。

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练手做了个listview的多选demo,网上看其他人的例子感觉不是很难,自己动手做了下,各种细节问题,没那么简单啊。既然做了,简单写个笔记记录下。
练手demo,命名笔记乱,不要建议。
运行界面1
运行界面2

主界面布局activity_main.xml

<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:id="@+id/rootView"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.listchecked.MainActivity" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="50dp"
        >

    </ListView>

    <LinearLayout
        android:id="@+id/button_group"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/listView1"
        android:layout_alignParentBottom="true"
        android:orientation="vertical" >

        <Button
            android:id="@+id/del"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="删除" />
    </LinearLayout>

</RelativeLayout>

列表item的布局

<?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"
    android:descendantFocusability="blocksDescendants" >
<!--注意上面这个属性,很关键,不加会导致list无法响应OnItemClickListener中的事件-->

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1" 
       >

        <CheckBox
            android:id="@+id/checkBox1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:clickable="false"
            android:focusable="false" />

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:scaleType="fitCenter"
            android:src="@drawable/ic_launcher" />

    </RelativeLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:gravity="center"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/title"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Title"
            android:textSize="20sp" />

        <TextView
            android:id="@+id/teacher"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Teacher" />

        <TextView
            android:id="@+id/time"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Time" />

        <TextView
            android:id="@+id/peopleNum"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="peopleNum"
             />

    </LinearLayout>

</LinearLayout>

这个item的布局就被在细节上坑了一次,item中添加button,checkbox,imageButton等时,会导致只响应这些控件的事件,item整体的事件就不会响应了,刚开始没有加那条属性,勾选checkbox后,点删除没有反应。这问题要发现也有点难度,之前见大神们推荐过分析布局的工具hierarchyviewer,这个工具,个人感觉和前端开发中的F12类似啊,很方便,可以看到每个布局的情况。也是好奇,点开一看,整个item的布局,从父布局,到子布局,只要checkbox可以接受click,其他全部是false,这就是问题所在了,后来百度了一下,即如上结论。解决办法就是添加
android:descendantFocusability=“blocksDescendants”
到list的item的布局里,添加以后,发现checkbox还是可以被单独点击,不响应list的点击选中事件,很是奇怪,看其他人的例子中就没有这种现象。最后只能设置checkbox不能被点击
android:clickable=“false”
布局问题解决了,下面是java类的源码
首先是bean类,ItemBean.java

package com.example.listchecked;


public class ItemBean {
    private int imgRes;
    private String title,teacher,time;
    private int peopleNum,id;
    private boolean isChecked;
    private boolean isShow;
    
    public boolean isShow() {
        return isShow;
    }
    public void setShow(boolean isShow) {
        this.isShow = isShow;
    }
    public int getId() {
        return id;
    }
    public void setId(int id) {
        this.id = id;
    }
    public boolean isChecked() {
        return isChecked;
    }
    public void setChecked(boolean isChecked) {
        this.isChecked = isChecked;
    }
    public int getImgRes() {
        return imgRes;
    }
    public void setImgRes(int img) {
        this.imgRes = img;
    }
    public String getTitle() {
        return title;
    }
    public void setTitle(String title) {
        this.title = title;
    }
    public String getTeacher() {
        return teacher;
    }
    public void setTeacher(String teacher) {
        this.teacher = teacher;
    }
    public String getTime() {
        return time;
    }
    public void setTime(String time) {
        this.time = time;
    }
    public int getPeopleNum() {
        return peopleNum;
    }
    public void setPeopleNum(int peopleNum) {
        this.peopleNum = peopleNum;
    }
    
    
    
}

自定义的Adapter,MyListAdapter.java

package com.example.listchecked;

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.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ImageView;
import android.widget.TextView;

public class MyListAdapter extends BaseAdapter
{
    private LayoutInflater inflater;
    private List<ItemBean> items;
    private ItemBean item;
    private OnShowItemClickListener onShowItemClickListener;
    
    public MyListAdapter(List<ItemBean> list,Context context)
    {
	items=list;
	inflater=LayoutInflater.from(context);
    }
    @Override
    public int getCount() {
	// TODO 自动生成的方法存根
	return items.size();
    }

    @Override
    public Object getItem(int position) {
	// TODO 自动生成的方法存根
	return items.get(position);
    }

    @Override
    public long getItemId(int position) {
	// TODO 自动生成的方法存根
	return items.get(position).getId();
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
	// TODO 自动生成的方法存根
	ViewHolder holder;//使用ViewHolder,大神说能提升性能
	if(convertView==null)
	{
	    holder=new ViewHolder();
	    convertView=inflater.inflate(R.layout.item_view, null);
	    holder.img=(ImageView) convertView.findViewById(R.id.imageView1);
	    holder.cb=(CheckBox) convertView.findViewById(R.id.checkBox1);
	    holder.title=(TextView)convertView.findViewById(R.id.title);
	    holder.teacher=(TextView) convertView.findViewById(R.id.teacher);
	    holder.time=(TextView) convertView.findViewById(R.id.time);
	    holder.poeple=(TextView)convertView.findViewById(R.id.peopleNum);
	    convertView.setTag(holder);
	}else
	{
	   holder=(ViewHolder) convertView.getTag();
	}
	item=items.get(position);
	if(item.isShow())
	{
	    holder.cb.setVisibility(View.VISIBLE);
	}
	else
	{
	    holder.cb.setVisibility(View.GONE);
	}
	holder.img.setImageResource(item.getImgRes());
	holder.title.setText(item.getTitle());
	holder.teacher.setText("主讲:"+item.getTeacher());
	holder.time.setText("课时:"+item.getTime()+"讲");
	holder.poeple.setText("学习人数:"+item.getPeopleNum());
	
	holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {
	    
	   

	    @Override
	    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
		if(isChecked)
		{
		    item.setChecked(true);
		}
		else
		{
		    item.setChecked(false);
		}
		//回调方法,讲item加入已选择的
		onShowItemClickListener.onShowItemClick(item);
	    }
	});
	//监听后设置选择状态
	holder.cb.setChecked(item.isChecked());
	return convertView;
    }
    
    static class ViewHolder
    {
	ImageView img;
	CheckBox cb;
	TextView title,teacher,time,poeple;
	
    }
    
    public interface OnShowItemClickListener {
	public void onShowItemClick(ItemBean bean);
    }
    
    public void setOnShowItemClickListener(OnShowItemClickListener onShowItemClickListener) {
	this.onShowItemClickListener = onShowItemClickListener;
}
}

最后是MainActivity.java

package com.example.listchecked;

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

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Toast;

import com.example.listchecked.MyListAdapter.OnShowItemClickListener;

public class MainActivity extends Activity implements OnShowItemClickListener {

    private ListView listView;
    private List<ItemBean> dataList,selectedList;
    private MyListAdapter myAdapter;
    private RelativeLayout rootView;
    private LinearLayout menuView;
    private LinearLayout openView;
    private static boolean isShow;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);
	isShow=false;
	setContentView(R.layout.activity_main);
	Button delbtn=(Button) findViewById(R.id.del);
	rootView=(RelativeLayout) findViewById(R.id.rootView);
	menuView=(LinearLayout) findViewById(R.id.button_group);
	listView=(ListView) findViewById(R.id.listView1);
	dataList=new ArrayList<ItemBean>();
	selectedList=new ArrayList<ItemBean>();
	for(int i=0;i<10;i++)
	{
	    ItemBean item=new ItemBean();
	    item.setId(i);
	    item.setImgRes(R.drawable.ic_launcher);
	    item.setTitle("第"+item.getId()+"个");
	    item.setTeacher("杨老师");
	    item.setTime("34");
	    item.setPeopleNum(i+1*100);
	    item.setChecked(false);
	    item.setShow(isShow);
	    dataList.add(item);
	}
	myAdapter=new MyListAdapter(dataList, this);
	myAdapter.setOnShowItemClickListener(MainActivity.this);
	listView.setAdapter(myAdapter);
	
	delbtn.setOnClickListener(new OnClickListener() {
	    
	    @Override
	    public void onClick(View v) {
		// TODO 自动生成的方法存根
		showMenu();
		isShow=true;
		selectedList.clear();
		for(ItemBean item:dataList)
		{
		   
		    item.setShow(isShow);
		}
		myAdapter.notifyDataSetChanged();
		
	    }
	});
	listView.setOnItemClickListener(new OnItemClickListener() {

	    @Override
	    public void onItemClick(AdapterView<?> parent, View view,
		    int position, long id) {
		// TODO 自动生成的方法存根
		if (isShow) {
			ItemBean item = dataList.get(position);
			boolean isChecked = item.isChecked();
			if (isChecked) {
			    item.setChecked(false);
			} else {
			    item.setChecked(true);
			}
			myAdapter.notifyDataSetChanged();
			Log.d("select",selectedList.size()+"");
		}
	    }
	});
	
    }
    //显示选择删除等的菜单
    private void showMenu()
    {
	RelativeLayout.LayoutParams lp=new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.MATCH_PARENT,
		RelativeLayout.LayoutParams.WRAP_CONTENT);
	lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
	LayoutInflater inflater = (LayoutInflater) this.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	openView=(LinearLayout) inflater.inflate(R.layout.delmenu_layout, null);
	rootView.removeView(menuView);
	rootView.addView(openView,lp);
	final Button sBtn=(Button) openView.findViewById(R.id.selectAll);
	Button dBtn=(Button) openView.findViewById(R.id.del_button);
	Button cBtn= (Button) openView.findViewById(R.id.cancel_button);
	sBtn.setOnClickListener(new OnClickListener() {
	    
	    @Override
	    public void onClick(View v) {
		// TODO 自动生成的方法存根
		if ("全选".equals(sBtn.getText().toString())) {
			for (ItemBean bean : dataList) {
				if (!bean.isChecked()) {
					bean.setChecked(true);
					if (!selectedList.contains(bean)) {
						selectedList.add(bean);
					}
				}
			}
			myAdapter.notifyDataSetChanged();
			sBtn.setText("反选");
		} else if ("反选".equals(sBtn.getText().toString())) {
			for (ItemBean bean : dataList) {
				bean.setChecked(false);
				if (!selectedList.contains(bean)) {
					selectedList.remove(bean);
				}
			}
			myAdapter.notifyDataSetChanged();
			sBtn.setText("全选");
	    }
	    }
	});
	
	dBtn.setOnClickListener(new OnClickListener() {
	    
	    @Override
	    public void onClick(View v) {
		// TODO 自动生成的方法存根
		if (selectedList!=null && selectedList.size()>0) {
			dataList.removeAll(selectedList);
			myAdapter.notifyDataSetChanged();
			selectedList.clear();
		} else {
			Toast.makeText(MainActivity.this, "请选择条目", Toast.LENGTH_SHORT).show();
		}
	    }
	});
	cBtn.setOnClickListener(new OnClickListener() {
	    
	    @Override
	    public void onClick(View v) {
		// TODO 自动生成的方法存根
		if (isShow) {
			selectedList.clear();
			for (ItemBean bean : dataList) {
				bean.setChecked(false);
				bean.setShow(false);
			}
			myAdapter.notifyDataSetChanged();
			isShow = false;
			restoreView();
		}
	    }
	});
	
    }
    @Override
    public void onShowItemClick(ItemBean bean) {
	// TODO 自动生成的方法存根
	if (bean.isChecked() && !selectedList.contains(bean)) {
		selectedList.add(bean);
	} else if (!bean.isChecked() && selectedList.contains(bean)) {
		selectedList.remove(bean);
	}
    }
   
    private void restoreView()
    {
	rootView.addView(menuView);
	if(openView!=null)
	{
	    rootView.removeView(openView);
	    openView=null;
	}
	
    }
}

最后还有那个小菜单的布局,还是放上吧

<?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" >

    <Button
        android:id="@+id/selectAll"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="全选" />

    <Button
        android:id="@+id/del_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="删除" />

    <Button
        android:id="@+id/cancel_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="取消" />

</LinearLayout>

全部代码都放上了,如果不想复制粘贴,GitHub地址:https://github.com/2767321434/ListChecked

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