[Android] dynamic addition of data in ListView

Design Concept: append data records to the list placed in the adapter, and then use the notifyDataSetChanged () refresh of the adapter.

In this example.

Package com. app. test01; import java. util. arrayList; import java. util. hashMap; import java. util. list; import org. json. JSONArray; import org. json. JSONException; import org. json. JSONObject; import android. r. integer; import android. app. activity; import android. OS. bundle; import android. view. contextMenu; import android. view. layoutInflater; import android. view. menuItem; import android. view. view; import android. view. contextMenu. contextMenuInfo; import android. widget. absListView; import android. widget. absListView. onScrollListener; import android. widget. adapterView; import android. widget. adapterView. adapterContextMenuInfo; import android. widget. baseAdapter; import android. widget. listView; import android. widget. textView; import android. widget. toast; import com. app. adapter. myWeixinJSON; import com. app. adapter. myWeixinList;/*** click the data appended ListView * @ author 402-9 **/public class ListViewPage extends Activity {private ListView lv; private BaseAdapter mJson; private JSONArray mData = new JSONArray (); // JSON data source private View view_page_footer; // bottom View private int num = 1; // load data count private int count = 50; // total data // private boolean flag; @ Overrideprotected void onCreate (Bundle savedInstanceState) {// TODO Auto-generated method stubsuper. onCreate (savedInstanceState); setContentView (R. layout. weixin); lv = (ListView) findViewById (R. id. lv); getJSONArray (mData); mJson = new MyWeixinJSON (mData, this); view_page_footer = LayoutInflater. from (this ). inflate (R. layout. view_page_footer, null); lv. addFooterView (view_page_footer); // Add the bottom view TextView text_page = (TextView) view_page_footer.findViewById (R. id. text_page); text_page.setOnClickListener (new View. onClickListener () {// click the button to append data and notify the adapter @ Overridepublic void onClick (View v) {// TODO Auto-generated method stubTextView TV = (TextView) v; TV. setText ("loading... "); getJSONArray (mData); TV. setText ("next page"); mJson. notifyDataSetChanged () ;}}); lv. setAdapter (mJson); // bind the adapter}/** data source JSONArray */private void getJSONArray (JSONArray jArray) {try {for (int I = 1; I <= 5; I ++) {JSONObject jsonObject = new JSONObject (); jsonObject. put ("title", "name" + num ++); jsonObject. put ("time", "September 29"); jsonObject. put ("info", "I have passed your friend verification request, now we can start to talk"); jsonObject. put ("img", R. drawable. special_spring_head2); jArray. put (jsonObject); if (num = count) {lv. removeFooterView (view_page_footer); Toast. makeText (this, "No more data... ", Toast. LENGTH_LONG ). show () ;}} catch (Exception e) {// TODO: handle exception }}}

The added bottom view has only one button for clicking append:

<? 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 = "wrap_content" android: orientation = "vertical" android: padding = "5dp"> <TextView android: id = "@ + id/text_page" android: layout_width = "fill_parent" android: layout_height = "wrap_content" android: text = "next page" android: gravity = "center"/> </LinearLayout>

Click "Next page" to append data to the ListView.

After the append is complete, clear the bottom view.