安卓开发复习笔记——GridView组件

 1 package com.example.gridviewtest;
 2 
 3 import java.util.ArrayList;
 4 import java.util.HashMap;
 5 import java.util.List;
 6 import java.util.Map;
 7 
 8 import android.app.Activity;
 9 import android.os.Bundle;
10 import android.view.View;
11 import android.widget.AdapterView;
12 import android.widget.AdapterView.OnItemClickListener;
13 import android.widget.GridView;
14 import android.widget.SimpleAdapter;
15 import android.widget.Toast;
16 
17 public class MainActivity extends Activity implements OnItemClickListener {
18 
19     private GridView gridView;// 声明GridView对象
20     private List<Map<String,Object>> dataList;//数据源集合对象
21     private SimpleAdapter simpleAdapter;
22     // 图标资源
23     private int images[] = { R.drawable.address_book, R.drawable.calendar,
24             R.drawable.camera, R.drawable.clock, R.drawable.games_control,
25             R.drawable.messenger, R.drawable.ringtone, R.drawable.settings,
26             R.drawable.speech_balloon, R.drawable.weather, R.drawable.world,
27             R.drawable.youtube };
28     // 图标下文字资源
29     private String[] texts= { "联系人", "日历", "照相机", "时钟", "游戏", "短信", "铃声",
30             "设置", "语音", "天气", "浏览器", "Youtube" };
31 
32     @Override
33     protected void onCreate(Bundle savedInstanceState) {
34         super.onCreate(savedInstanceState);
35         setContentView(R.layout.activity_main);
36         gridView = (GridView) findViewById(R.id.gridview);// 取得对象
37         gridView.setOnItemClickListener(this);
38         dataList=new ArrayList<Map<String,Object>>();
39         /*
40          * GridView使用步骤 1、获取数据源 getData() 2、制作适配器 3、绑定适配器
41          */
42         
43         //1、获取数据源
44         dataList=getData();
45         //2、制作适配器
46         simpleAdapter=new SimpleAdapter(this, dataList, R.layout.gridview_item, new String[]{"image","text"}, new int[]{R.id.image,R.id.text});
47         //绑定适配器
48         gridView.setAdapter(simpleAdapter);
49     }
50 
51     private List<Map<String, Object>> getData() {        
52         for(int i=0;i<images.length;i++){//每个map对象对应着一组数据
53             Map<String, Object> map=new HashMap<String, Object>();
54             map.put("image", images[i]);
55             map.put("text", texts[i]);
56             dataList.add(map);        
57         }
58         return dataList;
59     }
60 
61     @Override
62     public void onItemClick(AdapterView<?> parent, View view, int position,
63             long id) {
64         Toast.makeText(this,texts[position]+"应用被选择" , Toast.LENGTH_SHORT).show();
65     }
66 
67 }

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     tools:context="com.example.gridviewtest.MainActivity" 
 6     android:orientation="vertical">
 7     
 8       <!--
 9      GridView是可滚动的网格。一般用来显示多张图片。
10      android:horizontalSpacing="5dp" 两列之间的间距是5dp
11      android:verticalSpacing="5dp" 两行之间的间距是5dp
12      android:stretchMode="spacingWidth" 缩放与列宽大小同步
13      android:numColumns="auto_fit" 本来是一行显示几个，现在改为自动分配
14     -->
15     <GridView 
16             android:id="@+id/gridview"
17             android:layout_width="wrap_content"
18             android:layout_height="wrap_content"
19             android:horizontalSpacing="5dp"
20             android:verticalSpacing="10dp"
21             android:numColumns="3"
22         ></GridView>
23 
24   
25 
26 </LinearLayout>

 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context="com.example.gridviewtest.MainActivity" 
10     android:gravity="center"
11     android:orientation="vertical">
12     
13     <ImageView 
14         android:id="@+id/image"
15         android:layout_width="60dp"
16         android:layout_height="60dp"
17         android:layout_gravity="center"
18         android:src="@drawable/ic_launcher"
19         />
20     
21     <TextView 
22         android:id="@+id/text"
23         android:layout_width="wrap_content"
24         android:layout_height="wrap_content"
25         android:layout_gravity="center"
26         android:layout_marginTop="3dp"
27         />
28 
29 
30   
31 
32 </LinearLayout>

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.gridviewtest"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="8"
 9         android:targetSdkVersion="21" />
10 
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@android:style/Theme.Black.NoTitleBar" >
16         <activity
17             android:name=".MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21 
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25     </application>
26 
27 </manifest>