更新Adapter中的数据，并通知ListView显示

单击界面上的按钮，即可调用Adapter的notifyDatasetChanged()方法通知ListView更新显示。 
实例： 

package com.laili.apater;

import java.util.ArrayList;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class ListAdapterActivity extends Activity {

    private ListView list;
    private ArrayAdapter<String> adapter;
    private ArrayList<String> data;
    private Button addBtn;
    private int i = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        list = (ListView) findViewById(R.id.list);
        data = new ArrayList<String>();
        for (i = 0; i < 5; i++) {
            data.add(new String("" + (i + 1)));
        }

        adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);
        list.setAdapter(adapter);


        addBtn = (Button) findViewById(R.id.add);
        addBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                System.out.println(i);
                data.add(new String("" + (++i)));
                System.out.println(i);
                adapter.notifyDataSetChanged();
            }
        });

    }
}

布局： 

<?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="vertical" >

    <TextView
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/hello" />
    <ListView
        android:id="@+id/list"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"/>
    <Button
        android:id="@+id/add"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="添加"/>
</LinearLayout>

显示效果： 
 

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