Android入门第十二篇之Gallery

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       Android的Gallery控件是个很不错的看图控件，大大减轻了开发者对于看图功能的开发，而且效果也比较美观。本文介绍Gallery的用法，用反射机制来动态读取资源中的图片。

       本文的效果图：

main.xml源码:

[xhtml] view plain copy print ?

1. <?xml version="1.0" encoding="utf-8"?>  
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     android:orientation="vertical"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     >  
7. <Gallery android:id="@+id/gallery" android:layout_height="fill_parent" android:layout_width="fill_parent"></Gallery>  
8. </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"    ><Gallery android:id="@+id/gallery" android:layout_height="fill_parent" android:layout_width="fill_parent"></Gallery></LinearLayout>

程序源码：

[java] view plain copy print ?

1. package com.testImageView;  
2.   
3. import java.lang.reflect.Field;  
4. import java.util.ArrayList;  
5.   
6. import android.app.Activity;  
7. import android.content.Context;  
8. import android.graphics.Bitmap;  
9. import android.graphics.BitmapFactory;  
10. import android.os.Bundle;  
11. import android.view.View;  
12. import android.view.ViewGroup;  
13. import android.widget.AdapterView;  
14. import android.widget.BaseAdapter;  
15. import android.widget.Gallery;  
16. import android.widget.ImageView;  
17. import android.widget.AdapterView.OnItemClickListener;  
18.   
19. public class testImageView extends Activity {  
20.     private Gallery mGallery;  
21.     @Override  
22.     public void onCreate(Bundle savedInstanceState) {  
23.         super.onCreate(savedInstanceState);  
24.         setContentView(R.layout.main);  
25.           
26.         mGallery = (Gallery)findViewById(R.id.gallery);  
27.         try {  
28.             mGallery.setAdapter(new ImageAdapter(this));  
29.         } catch (IllegalArgumentException e) {  
30.             // TODO Auto-generated catch block  
31.             e.printStackTrace();  
32.         } catch (IllegalAccessException e) {  
33.             // TODO Auto-generated catch block  
34.             e.printStackTrace();  
35.         }  
36.         mGallery.setOnItemClickListener(new OnItemClickListener() {  
37.             public void onItemClick(AdapterView parent, View v, int position, long id) {  
38.                 testImageView.this.setTitle(String.valueOf(position));  
39.             }  
40.         });  
41.     }  
42.       
43.     /* 
44.      * class ImageAdapter is used to control gallery source and operation. 
45.      */  
46.     private class ImageAdapter extends BaseAdapter{  
47.         private Context mContext;  
48.         private ArrayList<Integer> imgList=new ArrayList<Integer>();  
49.         private ArrayList<Object> imgSizes=new ArrayList<Object>();  
50.         public ImageAdapter(Context c) throws IllegalArgumentException, IllegalAccessException{  
51.             mContext = c;  
52.               
53.             //用反射机制来获取资源中的图片ID和尺寸  
54.             Field[] fields = R.drawable.class.getDeclaredFields();  
55.             for (Field field : fields)  
56.             {  
57.                 if (!"icon".equals(field.getName()))//除了icon之外的图片  
58.                 {     
59.                     int index=field.getInt(R.drawable.class);  
60.                     //保存图片ID  
61.                     imgList.add(index);  
62.                     //保存图片大小  
63.                     int size[]=new int[2];  
64.                     Bitmap bmImg=BitmapFactory.decodeResource(getResources(),index);  
65.                     size[0]=bmImg.getWidth();size[1]=bmImg.getHeight();  
66.                     imgSizes.add(size);  
67.                 }  
68.             }  
69.         }  
70.         @Override  
71.         public int getCount() {  
72.             // TODO Auto-generated method stub  
73.   
74.             return imgList.size();  
75.         }  
76.   
77.         @Override  
78.         public Object getItem(int position) {  
79.             // TODO Auto-generated method stub  
80.   
81.             return position;  
82.         }  
83.   
84.         @Override  
85.         public long getItemId(int position) {  
86.             // TODO Auto-generated method stub  
87.   
88.             return position;  
89.         }  
90.   
91.         @Override  
92.         public View getView(int position, View convertView, ViewGroup parent) {  
93.             // TODO Auto-generated method stub  
94.   
95.             ImageView i = new ImageView (mContext);  
96.             //从imgList取得图片ID  
97.             i.setImageResource(imgList.get(position).intValue());  
98.             i.setScaleType(ImageView.ScaleType.FIT_XY);  
99.             //从imgSizes取得图片大小  
100.             int size[]= new int[2];  
101.             size=(int[]) imgSizes.get(position);  
102.             i.setLayoutParams(new Gallery.LayoutParams(size[0], size[1]));  
103.             return i;  
104.         }  
105.           
106.     };  
107. }  

package com.testImageView;import java.lang.reflect.Field;import java.util.ArrayList;import android.app.Activity;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;import android.widget.AdapterView.OnItemClickListener;public class testImageView extends Activity { private Gallery mGallery;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);                mGallery = (Gallery)findViewById(R.id.gallery);        try {   mGallery.setAdapter(new ImageAdapter(this));  } catch (IllegalArgumentException e) {   // TODO Auto-generated catch block   e.printStackTrace();  } catch (IllegalAccessException e) {   // TODO Auto-generated catch block   e.printStackTrace();  }        mGallery.setOnItemClickListener(new OnItemClickListener() {            public void onItemClick(AdapterView parent, View v, int position, long id) {             testImageView.this.setTitle(String.valueOf(position));            }        });    }        /*     * class ImageAdapter is used to control gallery source and operation.     */    private class ImageAdapter extends BaseAdapter{        private Context mContext;        private ArrayList<Integer> imgList=new ArrayList<Integer>();        private ArrayList<Object> imgSizes=new ArrayList<Object>();        public ImageAdapter(Context c) throws IllegalArgumentException, IllegalAccessException{            mContext = c;                        //用反射机制来获取资源中的图片ID和尺寸         Field[] fields = R.drawable.class.getDeclaredFields();         for (Field field : fields)         {          if (!"icon".equals(field.getName()))//除了icon之外的图片          {            int index=field.getInt(R.drawable.class);           //保存图片ID           imgList.add(index);           //保存图片大小           int size[]=new int[2];           Bitmap bmImg=BitmapFactory.decodeResource(getResources(),index);           size[0]=bmImg.getWidth();size[1]=bmImg.getHeight();           imgSizes.add(size);          }         }        }        @Override        public int getCount() {            // TODO Auto-generated method stub            return imgList.size();        }        @Override        public Object getItem(int position) {            // TODO Auto-generated method stub            return position;        }        @Override        public long getItemId(int position) {            // TODO Auto-generated method stub            return position;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            // TODO Auto-generated method stub            ImageView i = new ImageView (mContext);            //从imgList取得图片ID            i.setImageResource(imgList.get(position).intValue());            i.setScaleType(ImageView.ScaleType.FIT_XY);            //从imgSizes取得图片大小            int size[]= new int[2];            size=(int[]) imgSizes.get(position);            i.setLayoutParams(new Gallery.LayoutParams(size[0], size[1]));            return i;        }            };}

           

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