Android-listview controls

1: First create a ListView view file. Listview.xml

<?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:o rientation= "Vertical" >        <!--    The ListView is a more commonly used component in Android development,    it presents the content as a list, and can be displayed adaptively based on the length of the data. --        <listview           android:id= "@+id/listview1"           android:layout_width= "Match_parent"           android:layout_height= "Wrap_content"           android:layout_margin= "5DP"            android:divider= "#dddddd"           android:dividerheight= "1DP" >    </ListView></LinearLayout>

　　

2: Defines a view file for the display interface. Item.xml

<?xml version= "1.0" encoding= "Utf-8"? ><relativelayout xmlns:android= "http://schemas.android.com/apk/res/ Android "Android:layout_width=" Match_parent "android:layout_height=" match_parent "> <imageview Andro Id:id= "@+id/pic" android:layout_width= "50DP" android:layout_height= "50DP" Android:layout_alignparentl Eft= "true" android:layout_alignparenttop= "true" android:layout_marginleft= "10DP" Android:layout_margi ntop= "5DP" android:src= "@drawable/xms" android:layout_marginbottom= "5DP"/> <textview androi D:id= "@+id/text1" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" Android:la yout_marginleft= "10DP" android:layout_torightof= "@+id/pic" android:textsize= "16SP" Android:te Xtcolor= "#333" android:layout_margintop= "10DP"/> <textview android:id= "@+id/text2" android:l       Ayout_width= "Wrap_content" android:layout_height= "Wrap_content" android:layout_alignleft= "@+id/text1" android:layout_below= "@+id/text1 "Android:textcolor=" #666 "android:textsize=" 14sp "/> <textview android:id=" @+id/tex T3 "android:layout_width=" wrap_content "android:layout_height=" wrap_content "android:layout_above=" @+ Id/text2 "android:layout_alignparentright=" true "android:textcolor=" #666 "android:textsize=" 12SP "android:layout_marginright=" 5DP "/></relativelayout>

　

3: Write code in source file: First way (Simpleadapter adapter)

Package Com.huanglinbin.weixintext;import Java.util.arraylist;import Java.util.hashmap;import java.util.List; Import Java.util.map;import android.app.activity;import Android.os.bundle;import Android.widget.listview;import Android.widget.radiogroup;import Android.widget.simpleadapter;public class Mainactivity extends Activity {// Privatize the ListView control. Private ListView listview;//Privatization of the ListView adapter. Private Simpleadapter simpleadapter;//Privatisation list collection. Private list<map<string,object>> List = new arraylist<map<string,object>> ();// Privatization of Radiogub controls.    Private Radiogroup Radiogroup;        @Override protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);                Setcontentview (R.layout.activity_main);        Find the two controls first.        ListView = (ListView) Findviewbyid (R.id.listview1);                Radiogroup = (radiogroup) Findviewbyid (r.id.radiogroup1);        Assigns the data source to the collection.        List = GetDate (); Define an adapter Simpleadapter = new SimpleAdapter (this,//to ask the object.        list,//data source (that is, the data from the database is stored here, and then loop output) r.layout.item,//page output template.        New string[]{"pic", "Text1", "Text2", "Text3"},//This is equivalent to the attribute in the entity class, and these attributes are stored in the array.        New INT[]{R.ID.PIC,R.ID.TEXT1,R.ID.TEXT2,R.ID.TEXT3}//This relative to the handle, through the handle to find the data source in the template.        );        Add the adapter to the ListView control.           Listview.setadapter (Simpleadapter);    }//define the data source.    Private List<map<string,object>> GetDate () {//define a loop to output the data loop.    for (int i=0;i<5;i++) {//define a map collection and add the collection to the Map collection.    map<string,object> map = new hashmap<string, object> ();    Map.put ("Pic", R.DRAWABLE.XMS);    Map.put ("Text1", "Little Demon God");    Map.put ("Text2", "Android class teacher");    Map.put ("Text3", "Yesterday");    Add the Map collection to the list collection.    List.add (map);    } return list; }           }

　　

Second way: (Baseadapter adapter)

Simple understanding for VC tied together Baseadapter, store length recommended 5 star Lv.setadapter (new Baseadapter () {//return how many records @overridepublic int GetCount () {//TODO auto-generated method Stubreturn messagelist.size ();} Each item item returns an interface @overridepublic view GetView (int position, view Convertview, ViewGroup parent) {View view = null;//layout unchanged, Data Change//If the cache is empty, we generate a new layout as 1 itemif (convertview==null) {log.i ("info:", "no cache, regenerate" +position); Layoutinflater inflater = MainActivity.this.getLayoutInflater ();//Because the object returned by GetView (), adapter is automatically assigned to Listviewview = Inflater.inflate (r.layout.listview_item_layout, null);} ELSE{LOG.I ("Info:", "has cache, does not need to regenerate" +position); view = Convertview;} Message m = messagelist.get (position); TextView tv_username = (TextView) View.findviewbyid (r.id.tv_username); Tv_username.settext (M.getusername ()); tv_ Username.settextsize (15);  TextView tv_lastmessage = (TextView) View.findviewbyid (r.id.tv_lastmessage); Tv_lastmessage.settext ( M.getlastmessage ()); Tv_lastmessage.settextsize (12); TextView tv_datetime = (TextView) vIew.findviewbyid (R.id.tv_datetime); Tv_datetime.settext (M.getdatetime ()); Tv_datetime.settextsize (n); return view ;} @Overridepublic Object getItem (int position) {//TODO auto-generated method Stubreturn null;}                @Overridepublic long Getitemid (int position) {//TODO auto-generated method Stubreturn 0;} } );

　　

Android-listview controls