android ListView内数据的动态添加与删除实例代码
main.xml 文件：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal"
>
<linearlayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<listview
android:id="@+id/listview"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
/>
<button
android:id="@+id/add"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="添加"
/>
</linearlayout>
</linearlayout>
listview_item.xml文件：
<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="#000000"
android:padding="20dp"
>
<edittext
android:id="@+id/edit"
android:layout_width="200dp"
android:layout_height="wrap_content"
/>
<button
android:id="@+id/del"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="删除"
/>
</linearlayout>
mainactivity .java
package com.yyy.testandroid;
import java.util.arraylist;
import android.app.activity;
import android.content.context;
import android.os.bundle;
import android.view.layoutinflater;
import android.view.view;
import android.view.view.onclicklistener;
import android.view.view.onfocuschangelistener;
import android.view.viewgroup;
import android.widget.baseadapter;
import android.widget.button;
import android.widget.edittext;
import android.widget.listview;
import android.widget.textview;
public class testandroidactivity extends activity {
/** called when the activity is first created. */
private button button,add;
private textview text;
private listview listview;
public myadapter adapter;
@override
public void oncreate(bundle savedinstancestate) {
super.oncreate(savedinstancestate);
setcontentview(r.layout.main);
listview = (listview) findviewbyid(r.id.listview);
add = (button) findviewbyid(r.id.add);
adapter = new myadapter(this);
listview.setadapter(adapter);
add.setonclicklistener(new onclicklistener() {
@override
public void onclick(view arg0) {
// todo auto-generated method stub
adapter.arr.add("");
adapter.notifydatasetchanged();
}
});
}
private class myadapter extends baseadapter {
private context context;
private layoutinflater inflater;
public arraylist<string> arr;
public myadapter(context context) {
super();
this.context = context;
inflater = layoutinflater.from(context);
arr = new arraylist<string>();
for(int i=0;i<3;i++){ //listview初始化3个子项
arr.add("");
}
}
@override
public int getcount() {
// todo auto-generated method stub
return arr.size();
}
@override
public object getitem(int arg0) {
// todo auto-generated method stub
return arg0;
}
@override
public long getitemid(int arg0) {
// todo auto-generated method stub
return arg0;
}
@override
public view getview(final int position, view view, viewgroup arg2) {
// todo auto-generated method stub
if(view == null){
view = inflater.inflate(r.layout.list_item, null);
}
final edittext edit = (edittext) view.findviewbyid(r.id.edit);
edit.settext(arr.get(position)); //在重构adapter的时候不至于数据错乱
button del = (button) view.findviewbyid(r.id.del);
edit.setonfocuschangelistener(new onfocuschangelistener() {
@override
public void onfocuschange(view v, boolean hasfocus) {
// todo auto-generated method stub
if(arr.size()>0){
arr.set(position, edit.gettext().tostring());
}
}
});
del.setonclicklistener(new onclicklistener() {
@override
public void onclick(view arg0) {
// todo auto-generated method stub
//从集合中删除所删除项的edittext的内容
arr.remove(position);
adapter.notifydatasetchanged();
}
});
return view;
}
}
}