Android的ListView多選刪除操作實現代碼

2019-12-12 06:21:46

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最近嘗試做了個listview的多選demo，網上看其他人的例子感覺不是很難，自己動手做了下，各種細節問題，沒那么簡單啊。既然做了，簡單寫個筆記記錄下。
練手demo，命名筆記亂，不要介意哦。

運行界面1

運行界面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="刪除" /> </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" ><!--注意上面這個屬性，很關鍵，不加會導致list無法響應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>

這個item的布局就被在細節上坑了一次，item中添加button，checkbox,imageButton等時，會導致只響應這些控件的事件，item整體的事件就不會響應了，剛開始沒有加那條屬性，勾選checkbox后，點刪除沒有反應。這問題要發現也有點難度，之前見大神們推薦過分析布局的工具hierarchyviewer，這個工具，個人感覺和前端開發中的F12類似啊，很方便，可以看到每個布局的情況。也是好奇，點開一看，整個item的布局，從父布局，到子布局，只要checkbox可以接受click，其他全部是false，這就是問題所在了，后來百度了一下，即如上結論。

解決辦法就是添加Android:descendantFocusability=”blocksDescendants” 到list的item的布局里，添加以后，發現checkbox還是可以被單獨點擊，不響應list的點擊選中事件，很是奇怪，看其他人的例子中就沒有這種現象。最后只能設置checkbox不能被點擊 android:clickable=”false” 布局問題解決了，下面是java類的源碼:
首先是bean類，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; }}

自定義的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 自動生成的方法存根 return items.size(); } @Override public Object getItem(int position) { // TODO 自動生成的方法存根 return items.get(position); } @Override public long getItemId(int position) { // TODO 自動生成的方法存根 return items.get(position).getId(); } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO 自動生成的方法存根 ViewHolder holder;//使用ViewHolder，大神說能提升性能 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("主講："+item.getTeacher()); holder.time.setText("課時："+item.getTime()+"講"); holder.poeple.setText("學習人數："+item.getPeopleNum()); holder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() {  @Override  public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {  if(isChecked)  {   item.setChecked(true);  }  else  {   item.setChecked(false);  }  //回調方法，講item加入已選擇的  onShowItemClickListener.onShowItemClick(item);  } }); //監聽后設置選擇狀態 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()+"個");  item.setTeacher("楊老師");  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 自動生成的方法存根  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 自動生成的方法存根  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()+"");  }  } }); } //顯示選擇刪除等的菜單 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 自動生成的方法存根  if ("全選".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("反選");  } else if ("反選".equals(sBtn.getText().toString())) {   for (ItemBean bean : dataList) {    bean.setChecked(false);    if (!selectedList.contains(bean)) {     selectedList.remove(bean);    }   }   myAdapter.notifyDataSetChanged();   sBtn.setText("全選");  }  } }); dBtn.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {  // TODO 自動生成的方法存根  if (selectedList!=null && selectedList.size()>0) {   dataList.removeAll(selectedList);   myAdapter.notifyDataSetChanged();   selectedList.clear();  } else {   Toast.makeText(MainActivity.this, "請選擇條目", Toast.LENGTH_SHORT).show();  }  } }); cBtn.setOnClickListener(new OnClickListener() {  @Override  public void onClick(View v) {  // TODO 自動生成的方法存根  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 自動生成的方法存根 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; } }}

最后還有那個小菜單的布局，還是放上吧

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

全部代碼都放上了，如果不想復制粘貼，GitHub地址：https://github.com/2767321434/ListChecked

以上就是本文的全部內容，希望對大家學習Android軟件編程有所幫助。

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