Sax-based XML parsing with Source UI Class (II)

This section is part of the UI, incidentally, by simply using the Thread+handler

Layout class: Only two XML files

Activity_main: main layout, only one ListView is not given.

Item.xml uses a relative layout to display the items in the ListView.

<?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=" 20DP "android:gravity=" Center "> <textview android:id= "@+id/name_tv" android:layout_width= "Wrap_content" android:layout_height= " Wrap_content "android:layout_alignbottom=" @+id/id_tv "android:layout_marginleft=" 60DP "android:layout _torightof= "@+id/id_tv" android:text= "TextView"/> <textview android:id= "@+id/age_tv" Androi D:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_alignbaseline= "@+id/name_t V "android:layout_alignbottom=" @+id/name_tv "android:layout_alignparentright=" true "Android:layout_ma rginright= "19DP" android:text= "TextView"/> <textview android:id= "@+id/id_tv" android:layout _width= "Wrap_content" Androidoid:layout_height= "Wrap_content" android:layout_alignparentleft= "true" android:layout_alignparenttop= "true" android:layout_margintop= "76DP" android:text= "TextView"/></relativelayout>

Main class

public class Mainactivity extends Activity{private ListView listview=null;private static final String tag= "Parserxml"; private static final int msg_success = 1;//Request succeeded//private static final int msg_failure = 0;//Get failed identity private Handler Mhandl ER = new Handler () {public void Handlemessage (Message msg) {//This method runs on the UI thread switch (msg.what) {case msg_success://gets the data passed over Li st<person> list = (list<person>) msg.obj;//print for (person person:list) {log.d (TAG, person.tostring ());} Myadapter adapter=new myadapter (list); adapter.notifydatasetchanged (); Listview.setadapter (adapter); Break;default: break;}}; @Overrideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview (    R.layout.activity_main); listview= (ListView) This.findviewbyid (r.id.listview1);d oparserxml ();}        public class Myadapter extends Baseadapter {private list<person>list;         Pass a List in public myadapter (list<person>list) {this.list=list;} Return number @overridepublic int GetCount () {return list.size ();}        Gets the data at position @overridepublic Object getItem (int position) {return list.get (position);}         Returns the item id@overridepublic long getitemid (int position) {return position;} Return view@overridepublic view GetView (int position, view Convertview, ViewGroup parent) {Layoutinflater inflater= Layoutinflater.from (Mainactivity.this); Viewholder viewholder=null;if (convertview==null) {//is similar to the reuse mechanism of iOS and optimizes the loading of XML viewholder=new Viewholder (); Convertview=inflater.inflate (R.layout.item,null); viewholder.id_tv= (TextView) Convertview.findviewbyid (R.id.id_ TV); viewholder.name_tv= (TextView) Convertview.findviewbyid (R.ID.NAME_TV); viewholder.age_tv= (TextView) Convertview.findviewbyid (R.ID.AGE_TV);//Use tag to identify Convertview.settag (Viewholder);} else {//use tag to remove viewholder= (Viewholder) Convertview.gettag ();} Person Person=list.get (position); ViewHolder.id_tv.setText (Person.getid () + ""); ViewHolder.age_tv.setText ( Person.getage () + ""); ViewHolder.name_tv.setText (Person.getnaMe () + ""); return Convertview;} }protected void Doparserxml () {New Thread (new Runnable () {@Overridepublic void run () {LOG.D (TAG, "Start parsing xml"); InputStream Inputstream=httputils.getxml (); List<person>list=parserxmlutils.xmlparser (InputStream, "person");//Use Obtainmessage () to get a message messages =mhandler.obtainmessage (); message.what=msg_success;message.obj=list;mhandler.sendmessage (message);}}).    Start ();}    public class Viewholder {public TextView id_tv;    Public TextView Name_tv;    Public TextView Age_tv; } @Overridepublic Boolean Oncreateoptionsmenu (Menu menu) {//Inflate the menu; This adds items to the action Bar if it is P Resent.getmenuinflater (). Inflate (R.menu.main, menu); return true;}}

Process---"

1. Data processing is performed first:

Doparserxml ()

2. Passing the returned data to handler

3. Handler in the ListView binding adapter.

The use of Ps:adapter, Baseadapter and iOS UITableView is simply the likeness. (The meaning of the delegate method and the interface of the adapter is basically a meaning)

The list is also optimized for TableView: cell reuse.

The source code is as follows:

XML parsing of Andriod

Sax-based XML parsing with Source UI Class (II)