一，android开发经典实例系列-----ListView、GridView

 
 1，ListView 是android开发中最常用的控件之一，一般构成列表包括三个元素，ListView:用来展示列表的视图、Adapter：数据与视图连接的桥梁、Data:具体的数据包括 字符串 图片 或者控件。

     适配器一般有以下几种类型

     ArrayAdapter：Android中最简单的一种适配器，专门用于列表控件。只显示一行数据。

     SimpleAdapter：此适配器有最好的扩充性，可以自定义出各种效果。经常使用静态数据填充列表。

     CursorAdapter：通过游标向列表提供数据。

     ResourceCursorAdapter：这个适配器扩展了CursorAdapter，知道如何从资源创建视图。

     SimpleCursorAdapter：这个适配器扩展了ResourceCursorAdapter，从游标中得列创建 TextView/ImageView视图。下面获取通讯录的示例：

<?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"
    android:background="@drawable/bg"
   
    >
   	<ListView 
   	android:id="@+id/contacts_list"
   	android:layout_width="fill_parent"
   	android:layout_height="fill_parent"
	>
	</ListView>
</LinearLayout>

 

package net.csdn.blog.androidtoast;

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

import android.app.Activity;
import android.database.Cursor;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
	
	 ListView     mListView;
	 ArrayList<Map<String, String>> listData;
	     
    static final String NAME = "name";
	static final String NUMBER = "number";
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        getContacts();
    }

    /**
     * 获取联系人列表
     */
	private void getContacts() {
		mListView=(ListView) findViewById(R.id.contacts_list);
		listData = new ArrayList<Map<String, String>>();
		//获取数据库Cursor
		Cursor cur=getContentResolver().query(ContactsContract.Contacts.CONTENT_URI, null, null, null, null);
		startManagingCursor(cur);
		while (cur.moveToNext()) {
          Map<String, String> mp = new HashMap<String, String>();
          long id = cur.getLong(cur.getColumnIndex("_id"));
		  Cursor pcur = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,
			                  null, ContactsContract.CommonDataKinds.Phone.CONTACT_ID + "=" + Long.toString(id), 
		                      null, null);
		          
			            // 处理多个号码的情况
		           String phoneNumbers = "";
		           while (pcur.moveToNext()) {
			               String strPhoneNumber = pcur.getString(pcur.getColumnIndex(
			                       ContactsContract.CommonDataKinds.Phone.NUMBER));
			              phoneNumbers += strPhoneNumber + ":";
			           }
			           phoneNumbers += "\n";
			           pcur.close();
			           
			           String name = cur.getString(cur.getColumnIndex("display_name"));
			           mp.put(NAME, name);
			           mp.put(NUMBER, phoneNumbers);
			           listData.add(mp);
			        }
		 cur.close();
		 
		// 建立一个适配器去查询数据
        ListAdapter adapter = new SimpleAdapter(this, listData, android.R.layout.simple_list_item_2,
               new String[]{NAME, NUMBER},
               new int[] {android.R.id.text1, android.R.id.text2});
        mListView.setAdapter(adapter);
		//为listView添加事件监听
		mListView.setOnItemSelectedListener(new ListView.OnItemSelectedListener(){

			@Override
			public void onItemSelected(AdapterView<?> parent, View view,
					int position, long id) {
				Toast.makeText(getApplicationContext(), "当前所在行为："+Long.toString(parent.getSelectedItemId()+1), 1).show();
			}

			@Override
			public void onNothingSelected(AdapterView<?> parent) {
				// TODO Auto-generated method stub
				
			}
			
		});
	}
}

  

 2，GridView 网格视图，用于显示多行多列。直接上示例：

<?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"
    android:background="@drawable/bg"
    >
	<GridView
		android:id="@+id/gridview"
		android:layout_width="fill_parent"
		android:layout_height="wrap_content"
		android:numColumns="3"/>
		
</LinearLayout>

 

<?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" android:scrollbars="vertical">
	 <ImageView   
               android:layout_height="100dip"   
               android:id="@+id/ItemImage"   
               android:layout_width="80dip" 
               android:src="@drawable/png1" 
               android:layout_gravity="center_horizontal"/> 
                 
         <TextView   
               android:layout_width="wrap_content"   
               android:layout_height="wrap_content" 
               android:layout_gravity="center"  
               android:id="@+id/ItemText" />  
</LinearLayout>

 

package net.csdn.blog.androidtoast;

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

import android.app.Activity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;
import android.widget.SimpleAdapter;
import android.widget.Toast;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
	//定义图片整型数组
	private int[] mImages={
			R.drawable.png1,
			R.drawable.png2,
			R.drawable.png3,
			R.drawable.png4,
			R.drawable.png5,
			R.drawable.png6,
			R.drawable.png7,
			R.drawable.png8,
			R.drawable.png9

	};
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        //实例化GridView
        GridView mGridView=(GridView) findViewById(R.id.gridview);
        // 生成动态数组，并且传入数据
        ArrayList<HashMap<String, Object>> lstImageItem = new ArrayList<HashMap<String, Object>>();
        
        for (int i = 0; i < 9; i++) {
            HashMap<String, Object> map = new HashMap<String, Object>();
            map.put("ItemImage", mImages[i]);// 添加图像资源的ID
            map.put("ItemText", "NO." + String.valueOf(i+1));// 按序号做ItemText
            lstImageItem.add(map);
        }
        //构建一个适配器
        SimpleAdapter simple = new SimpleAdapter(this, lstImageItem,
                R.layout.gridviewitem,
                new String[] { "ItemImage", "ItemText" }, new int[] {
                        R.id.ItemImage, R.id.ItemText });
        mGridView.setAdapter(simple);
        //添加选择项监听事件
        mGridView.setOnItemClickListener(new GridView.OnItemClickListener(){

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				Toast toast=Toast.makeText(getApplicationContext(), "你选择了"+(position+1)+"号图片", 1);
				toast.setGravity(Gravity.BOTTOM, 0, 0);
				toast.show();
			}
        	
        });
        
    }
}