Android 高级UI设计笔记11：Gallery（画廊控件）之Gallery基本使用

 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:orientation="vertical"
 6     tools:context="com.himi.gallerydemo.MainActivity" >
 7 
 8     <TextView
 9         android:layout_width="fill_parent"
10         android:layout_height="wrap_content"
11         android:layout_marginBottom="5dp"
12         android:gravity="center_horizontal"
13         android:text="战斗机美图："
14         android:textSize="40sp"
15         android:textStyle="bold" />
16 
17     <ImageView
18         android:id="@+id/imageView"
19         android:layout_width="match_parent"
20         android:layout_height="400dp"
21         android:scaleType="fitCenter"
22         android:src="@drawable/ic_launcher" />
23 
24     <!-- android:spacing 设置图片之间的间距 -->
25 
26     <Gallery
27         android:id="@+id/gallery"
28         android:layout_width="match_parent"
29         android:layout_height="wrap_content"
30         android:layout_marginBottom="5dp"
31         android:spacing="2dp" />
32 
33 </LinearLayout>

 1 package com.himi.gallerydemo;
 2 
 3 import android.content.Context;
 4 import android.view.View;
 5 import android.view.ViewGroup;
 6 import android.widget.BaseAdapter;
 7 import android.widget.Gallery;
 8 import android.widget.ImageView;
 9 import android.widget.LinearLayout;
10 
11 /**
12  * 
13  * 自定义ImageAdapter适配器
14  * 要实现Gallery画廊控件功能，需要一个容器来存放Gallery显示的图片。
15  * 我们可以使用一个继承自BaseAdapter类的派生类ImageAdapter来装这些图片。
16  * @author hebao
17  *
18  */
19 public class ImageAdapter extends BaseAdapter {
20     //上下文对象，提供给外界实例化ImageAdapter
21     private Context mContext;
22     
23     //待加载到Gallery之中的图片id数组
24     public static int images[] = {
25             R.drawable.img1,
26             R.drawable.img2,
27             R.drawable.img3,
28             R.drawable.img4,
29             R.drawable.img5,
30             R.drawable.img6,
31             R.drawable.img7,
32             R.drawable.img8
33     };
34     
35     //ImageAdapter构造方法
36     public ImageAdapter(Context mContext) {
37         this.mContext = mContext;
38     }
39 
40     //获得图片的个数
41     @Override
42     public int getCount() {
43         
44         return images.length;
45     }
46 
47     
48     //获取对应索引上的图片
49     @Override
50     public Object getItem(int position) {
51         // TODO Auto-generated method stub
52         return images[position];
53     }
54     //获取对应图片的索引id
55     @Override
56     public long getItemId(int position) {
57         // TODO Auto-generated method stub
58         return position;
59     }
60 
61     //获取适配器中指定位置的视图对象
62     @Override
63     public View getView(int position, View convertView, ViewGroup parent) {
64         ImageView iv = new ImageView(mContext);
65         iv.setImageResource(images[position % images.length]);
66         iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
67         iv.setLayoutParams(new Gallery.LayoutParams(77, 77));
68         return iv;
69     }
70 
71 }

 1 package com.himi.gallerydemo;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.view.View;
 6 import android.view.Window;
 7 import android.widget.AdapterView;
 8 import android.widget.AdapterView.OnItemClickListener;
 9 import android.widget.Gallery;
10 import android.widget.ImageView;
11 import android.widget.Toast;
12 
13 public class MainActivity extends Activity {
14     private Gallery gallery;
15     private ImageView iv;
16 
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         requestWindowFeature(Window.FEATURE_NO_TITLE);
21         setContentView(R.layout.activity_main);
22             
23         iv = (ImageView) findViewById(R.id.imageView);
24         iv.setImageResource(ImageAdapter.images[0]);
25         
26         gallery = (Gallery) findViewById(R.id.gallery);
27         gallery.setAdapter(new ImageAdapter(this));
28         gallery.setOnItemClickListener(new OnItemClickListener() {
29 
30             @Override
31             public void onItemClick(AdapterView<?> parent, 
32                     View view, int position, long id) {
33                 iv.setImageResource(ImageAdapter.images[position]);
34                 Toast.makeText(MainActivity.this, "点击是图片"+(position+1), 0).show();
35                 
36             }
37         });
38     }
39 
40     
41 }