標(biāo)題: 商城開發(fā)筆記-10-Adapter的封裝以及使用 [打印本頁]
作者: 51黑bing 時(shí)間: 2016-3-22 17:27
標(biāo)題: 商城開發(fā)筆記-10-Adapter的封裝以及使用
一、Adapter的封裝
由于我們的RecycleView在項(xiàng)目中很常用，因此有必要對(duì)Adapter進(jìn)行封裝。
封裝的原則是：
BaseAdapter的代碼如下：
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import java.util.ArrayList;
import java.util.List;
/**
* Adapter的簡(jiǎn)單封裝
*/
public abstract class BaseAdapter<T, H extends BaseViewHolder> extends RecyclerView.Adapter<BaseViewHolder> {
protected static final String TAG = BaseAdapter.class.getSimpleName();
protected final Context context;
protected final int layoutResId;
protected List<T> datas;
private OnItemClickListener mOnItemClickListener = null;
public interface OnItemClickListener {
void onItemClick(View view, int position);
}
public BaseAdapter(Context context, int layoutResId) {
this(context, layoutResId, null);
}
public BaseAdapter(Context context, int layoutResId, List<T> datas) {
this.datas = datas == null ? new ArrayList<T>() : datas;
this.context = context;
this.layoutResId = layoutResId;
}
@Override
public BaseViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(layoutResId, viewGroup, false);
BaseViewHolder vh = newBaseViewHolder(view, mOnItemClickListener);
return vh;
}
@Override
public void onBindViewHolder(BaseViewHolder holder, int position) {
T item = getItem(position);
convert((H) holder, item);
}
@Override
public int getItemCount() {
if (datas == null || datas.size() <= 0)
return 0;
return datas.size();
}
public T getItem(int position) {
if (position >= datas.size()) return null;
return datas.get(position);
}
/**
* 清空數(shù)據(jù)
*/
public void clearData() {
int size = datas.size();
datas.clear();
notifyItemRangeRemoved(0, size);
}
/**
* 下拉刷新，清除原有數(shù)據(jù)，添加新數(shù)據(jù)
*
* @param newData
*/
public void refreshData(List<T> newData) {
datas.clear();
datas.addAll(newData);
notifyItemRangeChanged(0, datas.size());
}
/**
* 在原來數(shù)據(jù)的末尾追加新數(shù)據(jù)
*
* @param moreData
*/
public void loadMoreData(List<T> moreData) {
int lastPosition = datas.size();
datas.addAll(lastPosition, moreData);
notifyItemRangeInserted(lastPosition, moreData.size());
}
/**
* Implement this method and use the helperto adapt the view to the given item.
*
* @param viewHoder A fully initializedhelper.
* @param item The item that needs to be displayed.
*/
protected abstract void convert(H viewHoder, T item);
public void setOnItemClickListener(OnItemClickListener listener) {
this.mOnItemClickListener = listener;
}
}
BaseViewHolder的代碼如下：
import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
/**
* 封裝的ViewHolder
*/
public class BaseViewHolder extendsRecyclerView.ViewHolder implements View.OnClickListener {
//使用數(shù)組把條目中的View保存起來
private SparseArray<View> views;
private BaseAdapter.OnItemClickListener mOnItemClickListener;
public BaseViewHolder(ViewitemView, BaseAdapter.OnItemClickListener onItemClickListener) {
super(itemView);
itemView.setOnClickListener(this);
this.mOnItemClickListener = onItemClickListener;
this.views = new SparseArray<View>();
}
public TextView getTextView(int viewId) {
return retrieveView(viewId);
}
public Button getButton(int viewId) {
return retrieveView(viewId);
}
public ImageView getImageView(int viewId) {
return retrieveView(viewId);
}
public View getView(int viewId) {
return retrieveView(viewId);
}
protected <T extends View> T retrieveView(int viewId) {
View view = views.get(viewId);
if (view == null) {
view = itemView.findViewById(viewId);
views.put(viewId, view);
}
return (T) view;
}
@Override
public void onClick(View v) {
if (mOnItemClickListener != null) {
mOnItemClickListener.onItemClick(v, getLayoutPosition());
}
}
}
為了使用方便，再提供一個(gè)SimpleAdapter：
import android.content.Context;
import java.util.List;
/**
* 一個(gè)簡(jiǎn)易的adapter
*/
public abstract class SimpleAdapter<T> extends BaseAdapter<T, BaseViewHolder> {
public SimpleAdapter(Context context, int layoutResId) {
super(context, layoutResId);
}
public SimpleAdapter(Contextcontext, int layoutResId, List<T> datas) {
super(context, layoutResId, datas);
}
}
二、封裝Adapter的基本使用
1、使用
mAdapter = newSimpleAdapter<Page.Ware>(getActivity(), R.layout.item_hot_wares) {
@Override
protected void convert(BaseViewHolder holder, final Page.Ware item) {
SimpleDraweeView s = (SimpleDraweeView) holder.getView(R.id.drawee_view);
s.setImageURI(Uri.parse(item.getImgUrl()));
holder.getTextView(R.id.text_title).setText(item.getName());
holder.getTextView(R.id.text_price).setText(item.getPrice() + "");
holder.getButton(R.id.btn_add).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getActivity(), item.getName(), Toast.LENGTH_SHORT).show();
}
});
}
};
2、還可以進(jìn)行點(diǎn)擊監(jiān)聽
mAdapter.setOnItemClickListener(new BaseAdapter.OnItemClickListener() {
@Override
public void onItemClick(View view, int position) {
}
});
| 歡迎光臨 (http://www.torrancerestoration.com/bbs/) |
Powered by Discuz! X3.1 |