Android动态刷新listview中的数据

代码如下：

　　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 class TestAdapter extends Activity {
/** Called when the activity is first created. */
private int [] images ;
private ListView listview;
private MyAdapter adapter;
List < Map < String , Integer >> al;

@Override
public void onCreate(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 = new ArrayList < Map < String , Integer >> ();
for ( int i = 0 ; i < 12 ; i ++ ){
HashMap < String , Integer > map = new HashMap < String , Integer > ();
map.put( "" + i, images[i]);
al.add(map);
}

adapter = new MyAdapter(this, al, R.layout.list_item, new String []{ " imageview " , " tv " },
new int []{R.id.imageview, R.id.tv});
listview.setAdapter(adapter);
listview.setOnItemClickListener( new OnItemClickListener() {

public void onItemClick(AdapterView < ? > arg0, View arg1, int count,
long arg3) {
if (adapter.getCount() == count + 1 ){
HashMap < String , Integer > map = new HashMap < 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, " 正在刷新 " , Toast.LENGTH_SHORT).show();
}
}
});

}

private class MyAdapter extends SimpleAdapter{
int count = 0 ;
private List < Map < String , Integer >> mItemList;
public MyAdapter(Context context, List < ? extends Map < String , Integer >> data,
int resource, 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 int getCount() {
return mItemList.size();
}

public Object getItem( int pos) {
return pos;
}

public long getItemId( int pos) {
return pos;
}

@Override
public View getView( int position, View convertView, ViewGroup parent) {
Map < String , Integer > map = mItemList.get(position);
int image = 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);
return view;
}
}
}

　　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 >

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