android 动态改变listview的内容

本文模拟：点击一个按钮，为已有的listview添加一行数据

 

<?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"
        >

    <Button
            android:text="点击改变listview"
            android:onClick="changeListView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

    <ListView
            android:id="@+id/listview"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
</LinearLayout>

 

package com.example.listView_MultiPage;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import java.util.LinkedList;

public class MyActivity extends Activity {
    private ListView listView;
    private ArrayAdapter arrayAdapter;
    private LinkedList<String> data =  new LinkedList<String>();
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        listView = (ListView) findViewById(R.id.listview);

        //为listView添加数据
        for(int i=0; i<5; i++) {
            data.add(""+i);
        }

        arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, data);
        listView.setAdapter(arrayAdapter);

    }

    //button控件的点击方法
    public void changeListView(View view) {
        //先改变数据对象data
        data.addFirst("动态改变ListView后");
        //调用adapter的通知方法告诉listview数据已经改变
        arrayAdapter.notifyDataSetChanged();
    }
}

总结，①先改变listview数据对象的内容，②调用listview的adapter的notifyDataSetChanged()方法.