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