学步园

<?xml version="1.0" encoding="utf-8"?>
<Gallery xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/Gallery"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">
</Gallery>

3.用一个类继承自BaseAdapter来充当容器
 
public class ImageAdapter extends BaseAdapter {   
  
    private Context mContext; 

private Integer[] mImageIds = {   
            R.drawable.img1,   
            R.drawable.img2,   
            R.drawable.img3,   
            R.drawable.img4,   
            R.drawable.img5,   
            R.drawable.img6,   
            R.drawable.img7,   
            R.drawable.img8   
    };   
    public ImageAdapter(Context c){   
        this.mContext = c;   
    }   
    @Override  
    public int getCount() {   
        return mImageIds.length;//获取图片的个数   

}   
  
    @Override  
    public Object getItem(int position) {   
        return position;//获取图片在库中的位置   

}   
  
    @Override  
    public long getItemId(int position) {   
        return position;//获取图片在库中的位置   

}   
  
    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {   
        Log.i("TAG", position+"");   
        ImageView imageView = new ImageView(mContext);   
        imageView.setImageResource(mImageIds[position]);   
        imageView.setLayoutParams(new Gallery.LayoutParams(100,100));//设置图片大小   

imageView.setScaleType(ImageView.ScaleType.FIT_CENTER);//设置显示比例类型   

return imageView;   
    }   
  
}

 
4.使用时的java代码：
public class Test_Gallery extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Gallery g = (Gallery) this.findViewById(R.id.Gallery);
        g.setAdapter(new ImageAdapter(this));
        g.setBackgroundResource(R.drawable.bg0);
        g.setOnItemClickListener(new OnItemClickListener(){   

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
                Toast.makeText(Test_Gallery.this, "选择了"+(arg2+1)+"号图片", Toast.LENGTH_SHORT).show();
            }   

        });
    }
}