Android控件开发之Gallery

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Gallery是Android中的图片库控件。可以浏览自己的图片相册。

效果图

本程序main.xml源码

本程序ImageAdapter类源码

package com.sx.Gallery;

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<?xml version="1.0" encoding="utf-8"?>  
lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
   android:orientation="vertical"  
   android:layout_width="fill_parent"  
   android:layout_height="fill_parent">  
lt;TextView    
   android:layout_width="fill_parent"   
   android:layout_height="wrap_content"   
   android:text="@string/hello" />    
lt;Gallery    
   android:id="@+id/gallery"    
   android:layout_width="fill_parent"    
   android:layout_height="fill_parent"  
   android:spacing="2px" />    
   <!-- android:spacing="2px"用来设置图片之间的间距 -->   
     
lt;/LinearLayout>  

JAVA源码

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import android.content.Context;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.BaseAdapter;  
import android.widget.Gallery;  
import android.widget.ImageView;  
  
public class ImageAdapter extends BaseAdapter    
{    
         private Context context;    
      
         private int[] MyImageIDs =    
         {     
        R.drawable.img1,  
        R.drawable.img2,  
        R.drawable.img3,  
        R.drawable.img4,  
        R.drawable.img5,  
        R.drawable.img6,  
        R.drawable.img7,  
        R.drawable.img8,  
        R.drawable.img9,  
        R.drawable.img10,  
        R.drawable.img11,  
        R.drawable.img12,  
        R.drawable.img13,  
        R.drawable.img14,  
        R.drawable.img15,  
        R.drawable.img16,  
        R.drawable.img17,  
        R.drawable.img18,  
        R.drawable.img19,  
        R.drawable.img20  
         };    
      
    public ImageAdapter(Context context)    
    {    
        this.context = context;     
    }    
  
    // 获取图片个数    
    public int getCount()    
    {      
        return MyImageIDs.length;  
        //return Integer.MAX_VALUE;  
    }    
    // 获取图片在库中的位置    
    public Object getItem(int position)    
    {     
        return position;    
    }    
  
    // 获取图片在库中的ID    
    public long getItemId(int id)    
    {     
        return id;    
    }    
  
    public View getView(int position, View convertView, ViewGroup parent)    
    {    
        ImageView imageview = new ImageView(this.context);    
  
        // 给ImageView设置资源     
        imageview.setImageResource(this.MyImageIDs[position]);    
        // 设置布局 图片120*120     
        imageview.setLayoutParams(new Gallery.LayoutParams(120, 120));     
        // 设置显示比例类型     
        imageview.setScaleType(ImageView.ScaleType.FIT_XY);  
  
        //imageview.setScaleType(ImageView.ScaleType.FIT_CENTER);     
        return imageview;     
    }    
}    
  
//要想实现图片无限循环可拖动修改getCount()  函数改为返回值为return Integer.MAX_VALUE;  
//imageview.setImageResource(this.MyImageIDs[position] % MyImageIDs.length.);  即可  
  
   
  
Activity源码  
  
package com.sx.Gallery;  
  
import android.app.Activity;  
import android.os.Bundle;  
import android.view.View;  
import android.widget.AdapterView;  
import android.widget.AdapterView.OnItemClickListener;  
import android.widget.Gallery;  
import android.widget.Toast;  
  
public class GalleryActivity extends Activity   
{  
    /** Called when the activity is first created. */  
    @Override  
    public void onCreate(Bundle savedInstanceState)  
    {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
  
        CreateGallery();  
    }  
      
         private void CreateGallery()  
         {  
            //获得Gallery对象     
               Gallery gellery=(Gallery)this.findViewById(R.id.gallery);   
             
             //添加ImageAdapter给Gallery对象 注意哦Gallery类并没有setAdapter这个方法 这个方法是从AbsSpinner类继承的    
               gellery.setAdapter(new ImageAdapter(this));    
    
             //设置Gallery的背景图片     
               //gellery.setBackgroundResource(R.drawable.bg0);     
    
             //设置Gallery的事件监听     
              gellery.setOnItemClickListener(new GalleryItemListener());     
    
         }     
         class GalleryItemListener implements OnItemClickListener  
         {     
             public void onItemClick(AdapterView<?> parent, View view, int position,  long id)  
             {     
                 Toast.makeText(GalleryActivity.this, "你选择了" + (position + 1) + " 号图片", Toast.LENGTH_SHORT).show();     
             }     
  
         }  
}  

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