Dynamic addition and deletion of data within the Android ListView

Main.xml file:

[Java]View Plaincopy

2. <?xml version="1.0" encoding="Utf-8"?>
4. <linearlayout xmlns:android="Http://schemas.android.com/apk/res/android"
6. Android:layout_width="Fill_parent"
8. android:layout_height="Fill_parent"
10. android:orientation="Horizontal"
12. >
14. <linearlayout
16. Android:layout_width="Fill_parent"
18. android:layout_height="Fill_parent"
20. android:orientation="Vertical"
22. >
24. <listview
26. android:id="@+id/listview"
28. Android:layout_width="Fill_parent"
30. android:layout_height="Wrap_content"
32. />
34. <button
36. android:id="@+id/add"
38. Android:layout_width="Wrap_content"
40. android:layout_height="Wrap_content"
42. android:text="Add"
44. />
46. </LinearLayout>
48. </LinearLayout>

Listview_item.xml file:

[Java]View Plaincopy

2. <?xml version="1.0" encoding="Utf-8"?>
4. <linearlayout xmlns:android="Http://schemas.android.com/apk/res/android"
6. Android:layout_width="Fill_parent"
8. android:layout_height="Wrap_content"
10. android:orientation="Horizontal"
12. android:background="#000000"
14. android:padding="20DP"
16. >
20. <edittext
22. android:id="@+id/edit"
24. Android:layout_width="200DP"
26. android:layout_height="Wrap_content"
28. />
30. <button
32. android:id="@+id/del"
34. Android:layout_width="Wrap_content"
36. android:layout_height="Wrap_content"
38. android:text="Delete"
40. />
44. </LinearLayout>

Mainactivity. java

[Java]View Plaincopy

2. Package com.yyy.testandroid;
10. Import java.util.ArrayList;
14. Import android.app.Activity;
16. Import Android.content.Context;
18. Import Android.os.Bundle;
20. Import Android.view.LayoutInflater;
22. Import Android.view.View;
24. Import Android.view.View.OnClickListener;
26. Import Android.view.View.OnFocusChangeListener;
28. Import Android.view.ViewGroup;
30. Import Android.widget.BaseAdapter;
32. Import Android.widget.Button;
34. Import Android.widget.EditText;
36. Import Android.widget.ListView;
38. Import Android.widget.TextView;
42. Public class Testandroidactivity extends Activity {
44. /** Called when the activity is first created. * /
48. private Button Button,add;
50. private TextView text;
52. Private ListView ListView;
54. Public Myadapter Adapter;
56. @Override
58. public void OnCreate (Bundle savedinstancestate) {
60. super.oncreate (savedinstancestate);
62. Setcontentview (R.layout.main);
64. ListView = (ListView) Findviewbyid (R.id.listview);
66. Add = (Button) Findviewbyid (R.id.add);
68. adapter = New Myadapter (this);
70. Listview.setadapter (adapter);
74. Add.setonclicklistener (new Onclicklistener () {
76. @Override
78. public void OnClick (View arg0) {
80. //TODO auto-generated method stub
82. Adapter.arr.add ("");
84. Adapter.notifydatasetchanged ();
86. }
88. });
90. }
96. private class Myadapter extends Baseadapter {
100. private context context;
102. private Layoutinflater Inflater;
104. Public arraylist<string> arr;
106. Public Myadapter (context context) {
108. super ();
110. This.context = context;
112. Inflater = Layoutinflater.from (context);
114. arr = new arraylist<string> ();
116. For (int i=0;i<3;i++) { //listview Initialize 3 subkeys
118. Arr.add ("");
120. }
122. }
124. @Override
126. public int GetCount () {
128. //TODO auto-generated method stub
130. return arr.size ();
132. }
134. @Override
136. Public Object getItem (int arg0) {
138. //TODO auto-generated method stub
140. return arg0;
142. }
144. @Override
146. public long getitemid (int arg0) {
148. //TODO auto-generated method stub
150. return arg0;
152. }
154. @Override
156. Public View GetView (final int position, view view, ViewGroup arg2) {
158. //TODO auto-generated method stub
160. if (view = = null) {
162. View = Inflater.inflate (R.layout.list_item, null);
164. }
166. final EditText edit = (EditText) View.findviewbyid (R.id.edit);
168. Edit.settext (Arr.get (position)); //No data confusion when refactoring adapter
170. Button del = (button) View.findviewbyid (R.id.del);
172. Edit.setonfocuschangelistener (new Onfocuschangelistener () {
174. @Override
176. public void Onfocuschange (View V, boolean hasfocus) {
178. //TODO auto-generated method stub
180. if (arr.size () >0) {
182. Arr.set (position, Edit.gettext (). toString ());
184. }
186. }
188. });
190. Del.setonclicklistener (new Onclicklistener () {
192. @Override
194. public void OnClick (View arg0) {
196. //TODO auto-generated method stub
198. //Delete the contents of the EditText of the deleted item from the collection
200. Arr.remove (position);
202. Adapter.notifydatasetchanged ();
204. }
206. });
208. return view;
210. }
212. }
214. }

http://blog.csdn.net/centralperk/article/details/7446726

Dynamic addition and deletion of data within the Android ListView