android 入门学习笔记attr.xml TypedArray obtainStyledAttributes 使用

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需要引入

import android.content.res.Resources;import android.content.res.TypedArray;

obtainStyledAttributes 作用就是从我们自己定义的attr.xml读取所需信息

 public class ImageAdapter extends BaseAdapter  {    int mGalleryItemBackground;    private Context mContext;    private Integer[] myImageIds;        public ImageAdapter(Context c, Integer[] aid)    {      mContext = c;      myImageIds = aid;      TypedArray a = obtainStyledAttributes(R.styleable.Gallery);      mGalleryItemBackground = a.getResourceId      (        R.styleable.Gallery_android_galleryItemBackground, 0      );      a.recycle();    }        @Override    public int getCount()    {      // TODO Auto-generated method stub      return myImageIds.length;    }        @Override    public Object getItem(int  position)    {      // TODO Auto-generated method stub      return null;    }    @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            /*产生ImageView对象*/      ImageView i = new ImageView(mContext);      /*设置图片给imageView对象*/      i.setImageResource(myImageIds[position]);      /*重新设置图片的宽高*/      i.setScaleType(ImageView.ScaleType.FIT_XY);      /*重新设置Layout的宽高*/      i.setLayoutParams(new Gallery.LayoutParams(138, 108));      /*设置Gallery背景图*/      i.setBackgroundResource(mGalleryItemBackground);      /*返回imageView对象*/      return i;    }  }