android 学习笔记:自定义通用ListView/GridView,实现ListAdapter 类

android 学习中发现经常血药用到ListView,而且还需要自定义View显示,实现ListAdapter interface

于是写了一个通用的CommonAdapter 类,简化ListAdapter 的实现.把Adaapter 需要根据layout 动态实现的部分提取出来.做成接口.静态部分做成通用方法,以后开发就可以只关注layout 部分的绑定.简化开发.

CommonAdapter 类

public class CommonAdapter extends BaseAdapter {

    private int customXmlName;
    protected ViewHolderModel Holder = null;
    protected final List<Map<String, Object>> list;
    private final Context context;

    /*
     * 构造函数设置Context 和 数据源
     */
    public CommonAdapter(ViewHolderModel vModel) {

        customXmlName = com.gzh.search.R.layout.list_item;
        this.context = vModel.context;
        this.list = vModel.list;
        this.Holder = vModel;
    }

    @Override
    public int getCount() {
        return list.size();
    }

    public void setLayout_Name(int name) {
        if (name <= 0) {
            return;
        }
        customXmlName = name;
    }

    @Override
    public Object getItem(int position) {
        if (position < list.size()) {
            return list.get(position);
        } else {

            return null;
        }
    }

    @Override
    public long getItemId(int position) {

        return position;
    }

    public void HolderModel(ViewHolderModel vModel) {
        this.Holder = vModel;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(customXmlName,
                    null);
            Holder.InitViewHoler(convertView);
            convertView.setTag(Holder);

        } else {
            Holder = (ViewHolderModel) convertView.getTag();
        }
        Holder.SetViewHolerValues(convertView, position);
        return convertView;
    }

}

customXmlName = com.gzh.search.R.layout.list_item :表示默认layout

ViewHolderModel  layout 对应的java Holder 抽象基类

 

/*初始化ItemView
 *设置View
 */
interface IViewHolderController {
    /*
     * 初始化
     */
    void InitViewHoler(View convertView);

    /*
     * 设置显示内容
     */
    void SetViewHolerValues(View convertView, int position);
}

public abstract class ViewHolderModel implements IViewHolderController {
    public ViewHolderModel Holder = null;
    protected List<Map<String, Object>> list;
    protected Context context;

    public ViewHolderModel(Context context, List<Map<String, Object>> list) {
        this.context = context;
        this.list = list;

    }
}

只需要实现抽象类ViewHolderModel,就完成了自定义Adapter的开发.

应用举例:

实现:ViewHolderModel 基类

public class HolderView extends ViewHolderModel {

    private ImageView itemLeftImage;
    private TextView itemText;
    private ImageView itemRightImage;
    private Button itemButton;

    public HolderView(Context context, List<Map<String, Object>> list) {
        super(context, list);

        // TODO Auto-generated constructor stub
    }

    @Override
    public void InitViewHoler(View convertView) {
        HolderView viewHolder = (HolderView) Holder;
        viewHolder.itemLeftImage = (ImageView) convertView
                .findViewById(R.id.item_left);
        viewHolder.itemText = (TextView) convertView
                .findViewById(R.id.item_text);
        viewHolder.itemRightImage = (ImageView) convertView
                .findViewById(R.id.item_right);
        viewHolder.itemButton = (Button) convertView.findViewById(R.id.btnOK);
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * com.gzh.common.IViewHolderController#SetViewHolerValues(android.view.
     * View, int)
     */
    @Override
    public void SetViewHolerValues(View convertView, int position) {
        HolderView viewHolder = (HolderView) Holder;
        Map<String, Object> item = list.get(position);

        viewHolder.itemLeftImage.setImageResource(Integer.parseInt(item.get(
                "left").toString()));
        viewHolder.itemText.setText(item.get("Text").toString());
        viewHolder.itemRightImage.setImageResource(Integer.parseInt(item.get(
                "Right").toString()));
        viewHolder.itemButton.setTag(position);

    }
}