Android adds an event to the ListView button above each item _android

This article describes the ListView to add an event to the button above each item as follows:

1. First look at the effect of the picture:
Here for testing only, I write the data dead, as needed can be modified on their own, in addition to achieve ListView above each item button on the event there are two ways:

1. Use final variable to extend the lifecycle scope of a local variable main code (this article is appended with all the code):

Note that the int position variable in the original GetView method is not final and is now final @Override public view GetView (final int position, View conver 
      Tview, ViewGroup parent) {Viewholder holder = null;  
         
        if (Convertview = = null) {holder=new viewholder (); 
        It can be understood that the view is returned to ListView Convertview = Minflater.inflate (r.layout.vlist, NULL) after acquiring the view from Vlist; 
        Holder.title = (TextView) Convertview.findviewbyid (r.id.title); 
        Holder.info = (TextView) Convertview.findviewbyid (r.id.info); 
        HOLDER.VIEWBTN = (Button) Convertview.findviewbyid (R.ID.VIEW_BTN);        
      Convertview.settag (holder); 
      }else {holder = (Viewholder) convertview.gettag (); 
      } holder.title.setText ((String) mdata.get (position). Get ("title"); 
      Holder.info.setText ((String) mdata.get (position). Get ("info"); 
      Holder.viewBtn.setTag (position); Add a Click event to the button after the button is added ListView will lose focus need to remove the focus of the button directly HOLDER.VIewbtn.setonclicklistener (New View.onclicklistener () {@Override public void OnClick (View v) {          
        Showinfo (position); 
       
      } 
      }); 
           
      Holder.viewBtn.setOnClickListener (MyListener (position)); 
    return convertview; 
    }///Extract Convenience Point public final class Viewholder {public TextView title; 
    public TextView info; 
  Public Button viewbtn; 
    public void Showinfo (int position) {ImageView img=new imageview (listviewactivity.this); 
    Img.setimageresource (r.drawable.b); New Alertdialog.builder (this). Setview (IMG). Settitle ("Details" +position). Setmessage ("Vegetable name:" +title[position]+ "Price:" +in Fo[position]). Setpositivebutton (OK), new Dialoginterface.onclicklistener () {@Override public void on 
  Click (dialoginterface dialog, int which) {}}). Show (); 
 }

2. Use the class to record the position of each button so that each button has its own listener main code:

The second method, the master generally use this method, the specific reason, I am not clear, to be studied public View getview (int position, Vie 
       W Convertview, ViewGroup parent) {Viewholder holder = null; 
      MyListener Mylistener=null;  
         
        if (Convertview = = null) {holder=new viewholder (); 
           
        It can be understood that the view is returned to ListView mylistener=new MyListener (position) after acquiring the view from Vlist; 
        Convertview = minflater.inflate (r.layout.vlist, NULL); 
        Holder.title = (TextView) Convertview.findviewbyid (r.id.title); 
        Holder.info = (TextView) Convertview.findviewbyid (r.id.info); 
        HOLDER.VIEWBTN = (Button) Convertview.findviewbyid (R.ID.VIEW_BTN);        
      Convertview.settag (holder); 
      }else {holder = (Viewholder) convertview.gettag (); 
      } holder.title.setText ((String) mdata.get (position). Get ("title"); 
      Holder.info.setText ((String) mdata.get (position). Get ("info"); Holder.vieWbtn.settag (position); 
       
      Add a Click event to the button after the button is added ListView will lose focus to remove the focus of the button directly Holder.viewBtn.setOnClickListener (MyListener); 
           
      Holder.viewBtn.setOnClickListener (MyListener (position)); 
    return convertview; 
      } Private class MyListener implements onclicklistener{int mposition; 
      Public MyListener (int inposition) {mposition= inposition; @Override public void OnClick (View v) {//TODO auto-generated method stub Toast.maketex 
      T (Listviewactivity.this, title[mposition], Toast.length_short). Show (); 
    }///Extract Convenience Point public final class Viewholder {public TextView title; 
    public TextView info; 
  Public Button viewbtn; 
 }

3. All code

1.listviewactivity.java All code:

Package Ms. 
 
ListView; 
Import java.util.ArrayList; 
Import Java.util.HashMap; 
Import java.util.List; 
 
Import Java.util.Map; 
Import android.app.Activity; 
Import Android.app.AlertDialog; 
Import Android.content.Context; 
Import Android.content.DialogInterface; 
Import Android.os.Bundle; 
Import Android.view.LayoutInflater; 
Import Android.view.View; 
Import Android.view.View.OnClickListener; 
Import Android.view.ViewGroup; 
Import Android.widget.AdapterView; 
Import Android.widget.AdapterView.OnItemSelectedListener; 
Import Android.widget.BaseAdapter; 
Import Android.widget.Button; 
Import Android.widget.ImageView; 
Import Android.widget.ListView; 
Import Android.widget.TextView; 
 
Import Android.widget.Toast; The public class Listviewactivity extends activity {/** called the ' when the ' is the ' is ' the ' activity ' is a-created private list<m 
  Ap<string, object>> Mdata; 
  private int flag; public static String title[]=new string[]{"dish name 0", "Dish Name 1", "Dish Name 2", "Dish name 3", "Dish name 4", "Dish name 5", "Dish name 6", "Dish name 7", "Dish name 8 "," Dish name 9 "}; 
   
 
  public static String info[]=new string[]{"￥:28", "￥:28", "￥:28", "￥:28", "￥:28", "￥:28", "￥:28", "￥:28", "￥:28", "￥:28",}; 
    @Override public void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); 
    Setcontentview (R.layout.main); 
    Mdata = GetData (); 
    ListView ListView = (ListView) Findviewbyid (R.id.listview); 
    Myadapter adapter = new Myadapter (this); 
     
     
  Listview.setadapter (adapter); //Get dynamic array data can be from other places (JSON, etc.) private list<map<string, object>> GetData () {list<map<st 
Ring, object>> list = new arraylist<map<string, object>> (); 
    for (int i=0;i<title.length;i++) {map<string, object> Map = new hashmap<string, object> (); 
    Map.put ("title", Title[i]); 
    Map.put ("info", Info[i]); 
List.add (map); 
  } return list; 
 
    public class Myadapter extends Baseadapter {private Layoutinflater minflater; Public myadaptER (context context) {This.minflater = Layoutinflater.from (context); 
    @Override public int GetCount () {//TODO auto-generated a stub return mdata.size (); @Override public Object getitem (int position) {//TODO auto-generated method stub return Nu 
    ll 
    @Override public long getitemid (int position) {//TODO auto-generated method stub return 0; //****************************************final method//Note that the INT position variable in the original GetView method is not final and is now final @Over 
      Ride public View getview (final int position, View Convertview, ViewGroup parent) {Viewholder holder = null;  
         
        if (Convertview = = null) {holder=new viewholder (); 
        It can be understood that the view is returned to ListView Convertview = Minflater.inflate (r.layout.vlist, NULL) after acquiring the view from Vlist; 
        Holder.title = (TextView) Convertview.findviewbyid (r.id.title); Holder.info = (TextView) Convertview.findviewbyid (r.id.info); 
        HOLDER.VIEWBTN = (Button) Convertview.findviewbyid (R.ID.VIEW_BTN);        
      Convertview.settag (holder); 
      }else {holder = (Viewholder) convertview.gettag (); 
      } holder.title.setText ((String) mdata.get (position). Get ("title"); 
      Holder.info.setText ((String) mdata.get (position). Get ("info"); 
      Holder.viewBtn.setTag (position); Add Click event to button ListView will lose focus need to remove the focus of the button directly Holder.viewBtn.setOnClickListener (new View.onclicklisten          
        ER () {@Override public void OnClick (View v) {showinfo (position); 
       
      } 
      }); 
           
      Holder.viewBtn.setOnClickListener (MyListener (position)); 
    return convertview; }//**************************************** The second method, the master generally use this method, specific reasons, I am not clear, to be studied/public View getview (int p Osition, View Convertview, ViewGroup parent) {//Viewholder holder = null; 
MyListener Mylistener=null;  
if (Convertview = null) {////Holder=new viewholder (); 
//Can be understood to return view to ListView//Mylistener=new MyListener (position) after acquiring view from Vlist; 
Convertview = minflater.inflate (r.layout.vlist, NULL); 
Holder.title = (TextView) Convertview.findviewbyid (r.id.title); 
Holder.info = (TextView) Convertview.findviewbyid (r.id.info); 
HOLDER.VIEWBTN = (Button) Convertview.findviewbyid (R.ID.VIEW_BTN);        
Convertview.settag (holder); 
}else {//Holder = (viewholder) convertview.gettag (); 
////Holder.title.setText ((String) mdata.get (position). Get ("title"); 
Holder.info.setText ((String) mdata.get (position). Get ("info"); 
Holder.viewBtn.setTag (position); Add a Click event to the button after the button is added ListView will lose focus to remove the focus of the button directly//Holder.viewBtn.setOnClickListener (myListEner); 
//holder.viewbtn.setonclicklistener (MyListener (position)); 
return convertview; 
}//}////Private class MyListener implements onclicklistener{/int mposition; 
Public MyListener (int inposition) {//mposition= inposition; }//@Override//public void OnClick (View v) {////TODO auto-generated a stub//to 
Ast.maketext (Listviewactivity.this, title[mposition], Toast.length_short). Show (); 
    Blic TextView title; 
    public TextView info; 
  Public Button viewbtn; 
    public void Showinfo (int position) {ImageView img=new imageview (listviewactivity.this); 
    Img.setimageresource (r.drawable.b); New Alertdialog.builder (this). Setview (IMG). Settitle ("Details" +position). Setmessage ("Vegetable name:" +title[position]+ "Price:" +in Fo[position]). sEtpositivebutton (OK), new Dialoginterface.onclicklistener () {@Override public void OnClick (dialoginterface 
  dialog, int which) {}}). Show (); 
 } 
   
   
}

2.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:o" rientation= "vertical" > 
 
  <listview  
    android:id= "@+id/listview" android:layout_width= "Fill_" 
    Parent " 
    android:layout_height=" fill_parent " 
    android:divider=" @drawable/list_line " 
    android: dividerheight= "1dip"/> 
 
</LinearLayout>

3.vlist.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:o" rientation= "vertical" > 
 
  <listview  
    android:id= "@+id/listview" android:layout_width= "Fill_" 
    Parent " 
    android:layout_height=" fill_parent " 
    android:divider=" @drawable/list_line " 
    android: dividerheight= "1dip"/> 
 

4.btn_detail_selecter.xml

<?xml version= "1.0" encoding= "Utf-8"?> <selector xmlns:android= 
"http://schemas.android.com/apk/res/" Android > 
 
  <item android:drawable= "@drawable/btn_detail_normal" android:state_enabled= "true" Android: State_focused= "false" android:state_pressed= "false"/> 
  <item android:drawable= "@drawable/btn_detail_ Pressed "android:state_enabled=" true "android:state_pressed=" true "/> 
  <item android:drawable=" @drawable/ Btn_detail_pressed "android:state_enabled=" true "android:state_focused=" true "/> 
 
</selector> 

5.item.xml

<?xml version= "1.0" encoding= "UTF-8"?> <selector xmlns:android= 
"http://schemas.android.com/apk/res/" Android > 
 
  <item android:drawable= "@drawable/item_higlight" android:state_focused= "true" Android:state_ Pressed= "false"/> 
  <item android:drawable= "@drawable/item_higlight" android:state_focused= "false" Android:state_pressed= "true"/> 
  <item android:drawable= "@drawable/item_higlight" android:state_selected = "true"/> 
  <item android:drawable= "@drawable/item_higlight" android:state_focused= "true"/> 
  < Item android:drawable= "@drawable/item_higlight"/> 
 

6.colors.xml

<?xml version= "1.0" encoding= "UTF-8"?> 
<resources> 
  <color name= "Region" > #8000ff00 </ color> 
  <color name= "ListTitle" > #ff23323b </color> 
  <color name= "text" > #ff848f9b </ color> 
  <color name= "Write" > #ffffffff </color> 
</resources> 

7.values.xml

<?xml version= "1.0" encoding= "Utf-8"?> 
<resources> 
 
  <string name= "Hello" >hello world, listviewactivity!</string> 
  <string name= "App_name" >ListView</string> 
 

8.drawables.xml

<?xml version= "1.0" encoding= "UTF-8"?> 
<resources> 
  <item type= "drawable" name= "BG" ># 80000000</item> 
  <item type= "drawable" name= "Transparent" > #00000000 </item> 
  <item type = "drawable" name= "LightBlue" > #ffcfe1ed </item> 
  <item type= "drawable" name= "Readmenu_btn_bg_f" ># 30ffffff</item> 
  <item type= "drawable" name= "readmenu_btn_bg_p" > #50ffffff </item> 
  < Item Type= "drawable" name= "Blackmask" > #30000000 </item> 

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Original link: http://blog.csdn.net/qq435757399/article/details/8256453

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