The ListView of Android UI

One, created in code (not applicable to XML layout files)

1. Create a project: Listviewlearn

2. Modify Mainactivity, inherit from listactivity

3. Create a string array to hold the actual content in the ListView

 Package com.learn.listviewlearn.utility;  Public class  Util {    publicstaticfinal string[] countrys = {"China", "United States", "Russia", "United Kingdom", "France"  };}

4. Modify the OnCreate method, set a adapter, and the contents of the array are realistic in the ListView

    @Override    protectedvoid  onCreate (Bundle savedinstancestate) {         Super . OnCreate (savedinstancestate);         // Setcontentview (r.layout.activity_main);        this. Setlistadapter (thenew arrayadapter<string>(this,                Android. R.layout.simple_dropdown_item_1line, Util.countrys));    }

Ii. using an XML layout file to define the style of the ListView

1. Modify the Activity_main.xml file, add a listview,id must be android:id= "@android: Id/list"

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"android:orientation= "vertical" >    <ListViewAndroid:id= "@android: Id/list"Android:layout_width= "Fill_parent"Android:layout_height= "Fill_parent"Android:background= "#FFFFFF00" >    </ListView></LinearLayout>

2. Modify the OnCreate method

    @Override    protectedvoid  onCreate (Bundle savedinstancestate) {         Super . OnCreate (savedinstancestate);        Setcontentview (R.layout.activity_main);         this. Setlistadapter (thenew arrayadapter<string>(this,                Android. R.layout.simple_dropdown_item_1line, Util.countrys));    }

Iii. using an XML layout file to define the style of the ListViewItem

1. First create a list_view.xml layout file

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "Horizontal" >    <ImageViewAndroid:id= "@+id/imageviewicon"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content"android:contentdescription= "@string/icon" >    </ImageView>    <TextViewAndroid:id= "@+id/textviewcontent"Android:layout_width= "Wrap_content"Android:layout_height= "Wrap_content" >    </TextView></LinearLayout>

2. Then create a adapter that inherits from Baseadapter, primarily modifying the GetCount () and GetView () methods

 PackageCom.learn.listviewlearn.adapter;ImportCOM.LEARN.LISTVIEWLEARN.R;ImportCom.learn.listviewlearn.utility.Util;ImportAndroid.content.Context;ImportAndroid.view.LayoutInflater;ImportAndroid.view.View;ImportAndroid.view.ViewGroup;ImportAndroid.widget.BaseAdapter;ImportAndroid.widget.ImageView;ImportAndroid.widget.TextView; Public classListviewadapterextendsBaseadapter {Privatecontext Context;  PublicListviewadapter () {//TODO auto-generated Constructor stub} @Override Public intGetCount () {returnUtil.COUNTRYS.length; } @Override PublicObject GetItem (intposition) {        //TODO auto-generated Method Stub        return NULL; } @Override Public LongGetitemid (intposition) {        //TODO auto-generated Method Stub        return0; } @Override PublicView GetView (intposition, View Convertview, ViewGroup parent) {        if(Convertview = =NULL) {Convertview= Layoutinflater.from (context). Inflate (R.layout.list_item,NULL); Itemviewcache Itemviewcache=NewItemviewcache (); Itemviewcache.imageview=(ImageView) Convertview.findviewbyid (R.id.imageviewicon); Itemviewcache.textview=(TextView) Convertview.findviewbyid (r.id.textviewcontent);        Convertview.settag (Itemviewcache); } Itemviewcache Cache=(Itemviewcache) Convertview.gettag ();        Cache.imageView.setImageResource (Util.images[position]);        Cache.textView.setText (Util.countrys[position]); returnConvertview; }        Private Static classitemviewcache{ PublicTextView TextView;  PublicImageView ImageView; }}

Util.java

 Package com.learn.listviewlearn.utility; Import COM.LEARN.LISTVIEWLEARN.R;  Public class Util {    publicstaticfinal string[] countrys = {"China", "United States", "Russia", "United Kingdom", "France" 
   
    };     
     Public 
    Static 
    Final 
    int [] images =
     {r.drawable.ic_launcher,            r.drawable.ic_launcher, R.drawable.ic_launcher,            r.drawable.ic_ Launcher, R.drawable.ic_launcher};}
   

Iv. Add the Click event for the ListView. You only need to implement the Onlistitemclick () method in Mainactivity

    @Override    protectedvoidintlong  ID) {        Toast.maketext (This, "You have selected" + util.countrys[position], Toast.length_short)                . Show ();    

Source: Hellolistview.zip