ListView specific Operation method of Android checkbox _android

The main implementation of this article is to add a CheckBox control to a custom ListView layout, by determining whether the user selects a checkbox to do the appropriate action on the ListView selected item. Show the feature through a demo, select an item in ListView, and then click the button button to show which items are selected.
1. The program structure chart is as follows:

Where Person.java is the entity class, Mainactivity.java is the activity component class. Listitem.xml is a custom list for each layout file.
2, listitem.xml layout file source code is as follows:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/" Android "android:orientation=" vertical "android:layout_width=" fill_parent "android:layout_height=" Fill_parent " > <linearlayout android:layout_width= "fill_parent" android:layout_height= "Wrap_content" Android:orientati on= "Horizontal" android:descendantfocusability= "blocksdescendants" > <checkbox android:id= "@+id/list.select" "Android:layout_width=" wrap_content "android:layout_height=" wrap_content "/> <textview android:id=" @+ Id/list.name "android:layout_width=" fill_parent "android:layout_height=" Wrap_content "android:layout_weight=" 1 "Android:text=" Name "android:layout_gravity=" center "android:textsize=" 20DP "android:layout_marginleft=" 1 0DP "/> <textview android:id=" @+id/list.address android:layout_width= "Fill_parent" Android:layout_hei ght= "Wrap_content" android:layout_weight= "1" android:text= "Address" android:layout_gravity= "center" android:textsize= "20DP"/> </linear 
 Layout> </LinearLayout>

3, main.xml layout file source code is as follows:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= 
"http://schemas.android.com/apk/" Res/android " 
 android:orientation=" vertical " 
 android:layout_width=" fill_parent " 
 android:layout_" height= "Fill_parent" > 
 <button 
  android:id= " 
  @+id/show" android:layout_width= "Fill_parent" android:layout_height= "Wrap_content" "android:text=" show 
  "/> 
 <listview android:id= 
  " @+id/ Lvperson " 
  android:layout_width=" fill_parent " 
  android:layout_height=" fill_parent "/> 
</ Linearlayout> 

4, Person.java entity class source code as follows:

Package Com.andyidea.bean; 
 
public class Person { 
 
 private String name; 
 Private String address; 
  
 Public String GetName () {return 
  name; 
 } 
 public void SetName (String name) { 
  this.name = name; 
 } 
 Public String getaddress () {return address 
  ; 
 } 
 public void setaddress (String address) { 
  this.address = address; 
 } 
  

5, Mainactivity.java class source code is as follows:

Package Com.andyidea.listview; 
Import java.util.ArrayList; 
Import Java.util.HashMap; 
 
Import java.util.List; 
 
Import Com.andyidea.bean.Person; 
Import android.app.Activity; 
Import Android.app.AlertDialog; 
Import Android.content.Context; 
Import Android.os.Bundle; 
Import Android.util.Log; 
Import Android.view.LayoutInflater; 
Import Android.view.View; 
Import Android.view.ViewGroup; 
Import Android.widget.BaseAdapter; 
Import Android.widget.Button; 
Import Android.widget.CheckBox; 
Import Android.widget.ListView; 
 
Import Android.widget.TextView; 
 public class Mainactivity extends activity {Button Show; 
 ListView LV; 
 list<person> persons = new arraylist<person> (); 
 Context Mcontext; 
 Mylistadapter adapter; 
  
 list<integer> listitemid = new arraylist<integer> (); /** called the activity is a. 
  * * @Override public void onCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (R.layoUt.main); 
  Mcontext = Getapplicationcontext (); 
  Show = (Button) Findviewbyid (r.id.show); 
   
  LV = (ListView) Findviewbyid (R.id.lvperson); 
  Initpersondata (); 
  adapter = new Mylistadapter (persons); 
   
  Lv.setadapter (adapter); Show.setonclicklistener (New View.onclicklistener () {@Override public void OnClick (View v) {ListItem 
    Id.clear (); 
     for (int i=0;i<adapter.mchecked.size (); i++) {if (Adapter.mChecked.get (i)) {listitemid.add (i); } if (Listitemid.size () ==0) {Alertdialog.builder builder1 = new Alertdialog.builder (mainactivity.th 
     IS); 
     Builder1.setmessage ("No Records selected"); 
    Builder1.show (); 
      
     }else{StringBuilder sb = new StringBuilder (); for (int i=0;i<listitemid.size (); i++) {sb.append ("itemid=" +listitemid.get (i) + ". 
     "); 
     } alertdialog.builder builder2 = new Alertdialog.builder (mainactivity.this); 
     Builder2.setmessage (Sb.tostring ()); Builder2.show ();
    } 
   } 
  }); 
  /** * Analog data/private void Initpersondata () {person Mperson; 
   for (int i=1;i<=12;i++) {Mperson = new person (); 
   Mperson.setname ("Andy" +i); 
   Mperson.setaddress ("Guangzhou" +i); 
  Persons.add (Mperson); 
  ///Custom ListView Adapter Class Mylistadapter extends baseadapter{list<boolean> mchecked; 
  List<person> Listperson; 
   
  hashmap<integer,view> map = new hashmap<integer,view> (); 
   Public Mylistadapter (list<person> List) {Listperson = new arraylist<person> (); 
    
   Listperson = list; 
   mchecked = new arraylist<boolean> (); 
   for (int i=0;i<list.size (); i++) {Mchecked.add (false); 
  @Override public int GetCount () {return listperson.size (); 
  @Override public Object getitem (int position) {return listperson.get (position); 
  @Override public long getitemid (int position) {return position; } @Override PublIC view GetView (int position, view Convertview, ViewGroup parent) {view view; 
    
   Viewholder holder = null; 
     
    if (map.get (position) = = null) {LOG.E ("mainactivity", "Position1 =" +position); 
    Layoutinflater Minflater = (layoutinflater) mcontext. Getsystemservice (Context.layout_inflater_service); 
    View = Minflater.inflate (R.layout.listitem, NULL); 
    Holder = new Viewholder (); 
    holder.selected = (CheckBox) View.findviewbyid (r.id.list_select); 
    Holder.name = (TextView) View.findviewbyid (r.id.list_name); 
    Holder.address = (TextView) View.findviewbyid (r.id.list_address); 
    Final int p = position; 
    Map.put (position, view);  
      Holder.selected.setOnClickListener (New View.onclicklistener () {@Override public void OnClick (View v) { 
      CheckBox cb = (checkbox) v; 
     Mchecked.set (P, cb.ischecked ()); 
    } 
    }); 
   View.settag (holder); 
    }else{log.e ("mainactivity", "Position2 =" +position); View = Map.get (position); 
   Holder = (viewholder) view.gettag (); 
   } holder.selected.setChecked (Mchecked.get (position)); 
   Holder.name.setText (Listperson.get (position). GetName ()); 
    
   Holder.address.setText (Listperson.get (position). GetAddress ()); 
  return view; 
  } Static class viewholder{CheckBox selected; 
  TextView name; 
 TextView address; 
 } 
}

The results of the program run are as follows:

I hope this article will help you learn about Android software programming.