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Android入門第十二篇之Gallery

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 本文來自http://blog.csdn.net/hellogv/ ,引用必須註明出處!

       Android的Gallery控制元件是個很不錯的看圖控制元件,大大減輕了開發者對於看圖功能的開發,而且效果也比較美觀。本文介紹Gallery的用法,用反射機制來動態讀取資源中的圖片。

       本文的效果圖:

 

main.xml原始碼:

[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>

 

程式原始碼:

[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.             //用反射機制來獲取資源中的圖片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之外的圖片  
  58.                 {     
  59.                     int index=field.getInt(R.drawable.class);  
  60.                     //儲存圖片ID  
  61.                     imgList.add(index);  
  62.                     //儲存圖片大小  
  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.             //從imgList取得圖片ID  
  97.             i.setImageResource(imgList.get(position).intValue());  
  98.             i.setScaleType(ImageView.ScaleType.FIT_XY);  
  99.             //從imgSizes取得圖片大小  
  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;                        //用反射機制來獲取資源中的圖片ID和尺寸         Field[] fields = R.drawable.class.getDeclaredFields();         for (Field field : fields)         {          if (!"icon".equals(field.getName()))//除了icon之外的圖片          {            int index=field.getInt(R.drawable.class);           //儲存圖片ID           imgList.add(index);           //儲存圖片大小           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);            //從imgList取得圖片ID            i.setImageResource(imgList.get(position).intValue());            i.setScaleType(ImageView.ScaleType.FIT_XY);            //從imgSizes取得圖片大小            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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