Android train——ListView绑定ArrayAdapter、SimpleAdapter、SimpleCursorAdapter、BaseAdapter

ListView绑定ArrayAdapter

res/layout/activity_main.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <!-- 添加一个ListView控件 -->
    <ListView
        android:id = "@+id/lv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

MainActivity.java

package com.train.openso.myapplication_a;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;

public class MainActivity extends ActionBarActivity {

    //(1)定义一个数组来存放ListView中item的内容。
    private final static String [] strs = new String[]{"first","second","third","fourth","fifth","sixth"};
    private ListView lv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.lv);
    //=============================================================
        //(2)通过实现ArrayAdapter的构造函数来创建一个ArrayAdapter的对象
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String> (this,
                android.R.layout.simple_list_item_single_choice,strs);

        //(3)为ListView绑定ArrayAdapter
        lv.setAdapter(arrayAdapter);
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        // 为ListView绑定一个点击监听器,点击后在标题栏显示点击的行数
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //点击后在标题上显示点击了第几行
                setTitle("你点击了第"+position+"行");
            }
        });
     //================================================================
    }
}

ListView绑定SimpleAdapter

res/layout/activity_main.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">

    <!-- 添加一个ListView控件 -->
    <ListView
        android:id = "@+id/lv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

item.xml --->做为每一行的布局

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="fill_parent"
    android:layout_width="fill_parent">
    <ImageView
        android:layout_alignParentRight="true"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/ItemImage"
        />
    <TextView
        android:id="@+id/ItemTitle"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:textSize="20sp"
        />
    <TextView
        android:id="@+id/ItemText"
        android:layout_height="wrap_content"
        android:layout_width="fill_parent"
        android:layout_below="@+id/ItemTitle"
        />
</RelativeLayout>

MainActivity.java

package com.train.openso.myapplication_a;

import android.content.Intent;
import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.SimpleAdapter;

import java.util.ArrayList;
import java.util.HashMap;


public class MainActivity extends ActionBarActivity {
private ListView lv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        lv = (ListView) findViewById(R.id.lv);

        //=============在Java代码中为ListView绑定数据
        //数据载入动态数组
        ArrayList<HashMap<String, Object>> arrayList  = new ArrayList<HashMap<String, Object>>();
        for(int i=0;i<9;i++){
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ITEMIMAGE",R.mipmap.ic_launcher);
            map.put("ITEMTITLE","第"+i+"行");
            map.put("ITEMTEXT","这是第"+i+"行");
            arrayList.add(map);
        }

        //通过实现ArrayAdapter的构造函数来创建一个ArrayAdapter的对象
        //new SimpleAdapter(this,数据源,每行的布局xml,数据源个体键值,每行的布局的元素id);
        //可抽象为:以个人规定的xml格式装载数据源,并绑定至SimpleAdapter。
        SimpleAdapter mSimpleAdapter = new SimpleAdapter(this,arrayList,
                R.layout.item,
                new String[] {"ITEMIMAGE","ITEMTITLE","ITEMTEXT"},
                new int[] {R.id.ItemImage,R.id.ItemTitle,R.id.ItemText});

        lv.setAdapter(mSimpleAdapter);
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                setTitle("点了第"+position+"行");
            }
        });


        /*=============================================================
        //(2)通过实现ArrayAdapter的构造函数来创建一个ArrayAdapter的对象
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String> (this,
                android.R.layout.simple_list_item_single_choice,strs);

        //(3)为ListView绑定ArrayAdapter
        lv.setAdapter(arrayAdapter);
        lv.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
        // 为ListView绑定一个点击监听器,点击后在标题栏显示点击的行数
        lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //点击后在标题上显示点击了第几行
                setTitle("你点击了第"+position+"行");
            }
        });
     ================================================================*/
    }
}

 

使用simpleAdapter的数据一般都是用HashMap构成的列表,列表的每一节对应ListView的每一行。通过SimpleAdapter的构造函数,将HashMap的每个键的数据映射到布局文件中对应控件上。这个布局文件一般根据自己的需要来自己定义。梳理一下使用SimpleAdapter的步骤。

(1)根据需要定义ListView每行所实现的布局。

(2)定义一个HashMap构成的列表,将数据以键值对的方式存放在里面。

(3)构造SimpleAdapter对象。

(4)将LsitView绑定到SimpleAdapter上。

 

----------------=------------

看了BaseAdapter,有点hold不住,以后再研究 

 

参考:http://www.cnblogs.com/noTice520/archive/2011/12/05/2276379.html

 

posted @ 2015-07-08 15:41  cuiz_book  阅读(287)  评论(0编辑  收藏  举报