Android dynamically refreshes data in the ListView

Has been plagued by the ListView after the location of the problem, it is now understood that the original can not reset the ListView adapter, and should be used notifydatasetchanged () to refresh, so that the position will not be pinned.

Here is an example of a test, click on the last record, will add a new record,

The code is as follows:

1.TestAdapter

Package com. Testadapter;import java.util.arraylist;import java.util.hashmap;import Java.util.list;import java.util.Map;import Android.app.activity;import Android.content.context;import Android.os.bundle;import Android.view.View;import Android.view.viewgroup;import Android.widget.adapterview;import Android.widget.AbsListView.OnScrollListener; Import Android.widget.adapterview.onitemclicklistener;import Android.widget.AdapterView.OnItemSelectedListener; Import Android.widget.abslistview;import Android.widget.imageview;import Android.widget.listview;import Android.widget.simpleadapter;import Android.widget.textview;import android.widget.Toast; Public classTestadapter extends Activity {/** Called when the activity is first created.*/    Private int[] images; PrivateListView ListView; PrivateMyadapter Adapter; List<Map<String,Integer>>al; @Override Public voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.main); Images=New int[]{android. R.drawable.ic_btn_speak_now, Android. R.drawable.alert_light_frame, Android. R.drawable.arrow_down_float, Android. R.drawable.arrow_up_float, Android. R.drawable.btn_star_big_off, Android. R.drawable.btn_star_big_on, Android. R.drawable.button_onoff_indicator_off, Android. R.drawable.button_onoff_indicator_on, Android. R.drawable.checkbox_off_background, Android. R.drawable.checkbox_on_background, Android. R.drawable.ic_btn_speak_now, Android.        R.drawable.ic_delete}; ListView=(ListView) Findviewbyid (R.id.listview); Al=NewArraylist<map<string,integer>>();  for(intI=0; i< A; i++) {HashMap<string,integer > Map =NewHashmap<string,integer>(); Map.put (""+I, images[i]);        Al.add (map); } Adapter=NewMyadapter ( This, AL, R.layout.list_item,Newstring[]{"ImageView","TV"},                 New int[]{r.id.imageview, r.id.tv}];        Listview.setadapter (adapter); Listview.setonitemclicklistener (NewOnitemclicklistener () { Public voidOnitemclick (adapterview<?> arg0, View arg1,intCount,LongArg3) {                if(Adapter.getcount () ==count+1) {HashMap<string,integer> map =NewHashmap<string, integer>(); Map.put (""+(Adapter.mItemList.size ()), Android.                    R.drawable.ic_dialog_email);                    Al.add (map); Adapter.mitemlist=al;                    Adapter.notifydatasetchanged (); Toast.maketext (Testadapter. This,"is refreshing", Toast.length_short). Show ();            }                            }        }); }            Private classMyadapter extends simpleadapter{intCount =0; PrivateList<map<string, integer>>mitemlist;  PublicMyadapter (context context, list<? extends Map<string, integer>>data,intResource, string[] from,int[] to) {Super (context, data, resource, from, to); Mitemlist= (list<map<string, integer>>) data; if(Data = =NULL) {Count=0; }Else{Count=data.size (); }        }         Public intGetCount () {returnmitemlist.size (); }         PublicObject GetItem (intPOS) {            returnPOS; }         Public LongGetitemid (intPOS) {            returnPOS; } @Override PublicView GetView (intposition, View Convertview, ViewGroup parent) {Map<string,integer> map = mitemlist.Get(position); intImage = Map.Get(""+position); View View=Super.getview (position, convertview, parent); ImageView ImageView=(ImageView) View.findviewbyid (R.id.imageview); TextView TV=(TextView) View.findviewbyid (r.id.tv);            Imageview.setbackgroundresource (image); Tv.settext (""+position); returnview; }    }}

2.main.xml

<?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"> <listview android:id="@+id/listview"Android:layout_width="fill_parent"Android:layout_height="wrap_content"></ListView> </LinearLayout>

3.list_item.xml

<?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"> <ImageView Android:id="@+id/imageview"Android:layout_width="wrap_content"Android:layout_height="wrap_content"> </ImageView> <TextView Android:id="@+id/tv"Android:layout_width="fill_parent"Android:layout_height="wrap_content"></TextView></LinearLayout>

Android dynamically refreshes data in the ListView