Android BaseAdapter 类 重写模版

BaseAdapter 需要实现的

① 继承类的构造方法

② public int getCount()

③ public Object  getItem(int position)

④ public long getItemId(int position)

⑤ public View getView(int position , View converView , ViewGroup parent)

    这个很重要，这个View 显示 某一指定位置的视图。

模版如下：

public class ImageAdapter extends BaseAdapter {
    private Context mContext;

    public ImageAdapter(Context c) {
        mContext = c;
    }

    public int getCount() {
        return mThumbIds.length;
    }

    public Object getItem(int position) {
        return null;
    }

    public long getItemId(int position) {
        return 0;
    }

    // create a new ImageView for each item referenced by the Adapter
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView;
        if (convertView == null) {  // if it's not recycled, initialize some attributes
            ......
        } else {
            imageView = (ImageView) convertView;
        }

        imageView.setImageResource(mThumbIds[position]);
        return imageView;
    }

    // references to our images
    private Integer[] mThumbIds = {
            R.drawable.sample_2, R.drawable.sample_3,
    };
}