Android之万能适配器Adapter的使用

万能适配器

万能适配器共有两个部分：SuperViewHolder 和 SuperBaseAdapter

万能的ViewHolder

public class SuperViewHolder {
    private SparseArray<View> mViews;
    private View mConvertView;
    private int mPosition;
    public SuperViewHolder(Context context, ViewGroup parent, int layoutId, int position) {
        mPosition = position;
        mViews = new SparseArray<>();
        mConvertView = LayoutInflater.from(context).inflate(layoutId, parent, false);
        mConvertView.setTag(this);
    }
    public static SuperViewHolder make(Context context, int layoutId, View convertView, ViewGroup parent, int position) {
        if (convertView == null) {
            return new SuperViewHolder(context, parent, layoutId, position);
        } else {
            SuperViewHolder superViewHolder = (SuperViewHolder) convertView.getTag();
            superViewHolder.mPosition = position;
            return superViewHolder;
        }
    }
    public <T extends View> T getView(int viewId) {
        View view = mViews.get(viewId);
        if (view == null) {
            view = mConvertView.findViewById(viewId);
            mViews.put(viewId, view);
        }
        return (T) view;
    }
    public int getPosition() {
        return mPosition;
    }
    public View getConvertView() {
        return mConvertView;
    }
}

万能的SuperBaseAdapter

public abstract class SuperBaseAdapter<T> extends BaseAdapter {
    protected Context mContext;
    protected List<T> mDatas;
    public SuperBaseAdapter(Context context, List<T> datas) {
        mContext = context;
        mDatas = datas;
    }
    @Override
    public int getCount() {
        return mDatas.size();
    }
    @Override
    public Object getItem(int position) {
        return mDatas.get(position);
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public abstract View getView(int position, View convertView, ViewGroup parent);
}

结合使用 SuperViewHolder 和 SuperBaseAdapter

class CalendarBaseAdapter extends SuperBaseAdapter<String> {
    public CalendarBaseAdapter(Context context, List<String> datas) {
        super(context, datas);
    }
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        SuperViewHolder superViewHolder = SuperViewHolder.make(mContext, R.layout.item_calendar, convertView, parent, position);
        ((TextView)superViewHolder.getView(R.id.calendar_time)).setText(mDatas.get(position));
        return superViewHolder.getConvertView();
    }
}

补充问题
 // 焦点抢占
关于在ListView的Item里增加(例CheckBox对象)造成Item无法点击问题
此问题是因为CheckBox对象抢占了Item的焦点，造成Item无法点击的
只需要在将CheckBox对象android:focusable属性值设置为false即可
 // 复用导致内容错乱
比如: 当Item中使用CheckBox时点击第一个则其它CheckBox也被选中了
      这是因为使用的是同一个CheckBox对象的缘故 ...
解决: 这样就需要记录CheckBox对象的状态来判断CheckBox是否被选中
      可以通过position来作为ID，来记录CheckBox状态是True或False