217.m1-分类界面的显示

分类界面现在有3个Holder,一个是Title，一个是图片的内容，还有一个是加载更多，加载更多不需要显示，因此

//获取到当前有几种类型的数据，默认是1种// 又额外多了一种条目类型  现在又三种  1 标题 2 内容 3 加载更多(没有显示)@Overridepublic int getViewTypeCount() {// TODO Auto-generated method stubreturn super.getViewTypeCount() + 1;}

为了让加载更多不显示，需要在父类中对MoreHolder进行设置，携带上参数判断是否需要加载更多getMore()，这个是返回一个boolean类型的数据

DefaultAdapter.java中

private BaseHolder getMoreHolder() {if(holder!=null){return holder;}else{holder=new MoreHolder(this, hasMore());return holder;}}

在MoreHolder.java的构造函数中进行判断参数

public MoreHolder(DefaultAdapter adapter, boolean hasMore) {super();this.adapter=adapter;this.hasMore = hasMore;//没有额外数据不刷新界面if(!hasMore){setData(0);}}

MoreHolder.java加载更多，当不需要加载更多的时候不掉用setData()

package com.ldw.market.holder;import com.ldw.market.R;import com.ldw.market.Adapter.DefaultAdapter;import com.ldw.market.utils.UiUtils;import android.view.View;import android.widget.RelativeLayout;/* * 加载更多的实现，直接把它当成一个Holder */public class MoreHolder extends BaseHolder<Integer>{public static final int HAS_NO_MORE=0;  // 没有额外数据了public static final int LOAD_ERROR=1;// 加载失败public static final int HAS_MORE=2;//  有额外数据private RelativeLayout rl_more_loading,rl_more_error;private boolean hasMore;//是否加载更多//MoreHolder的显示@Overridepublic View initView() {View view = View.inflate(UiUtils.getContext(), R.layout.load_more, null);rl_more_loading=(RelativeLayout) view.findViewById(R.id.rl_more_loading);rl_more_error=(RelativeLayout) view.findViewById(R.id.rl_more_error);return view;}private DefaultAdapter adapter;//接受adapterpublic MoreHolder(DefaultAdapter adapter, boolean hasMore) {super();this.adapter=adapter;this.hasMore = hasMore;//没有额外数据不刷新界面if(!hasMore){setData(0);}}@Overridepublic View getContentView() {//如果加载更多true,才加载更多if(hasMore){loadMore();}return super.getContentView();}private void loadMore() {// 请求服务器   加载下一批数据 //  交给Adapter  让Adapter  加载更多数据adapter.loadMore();}//刷新界面@Overridepublic void refreshView(Integer data) {rl_more_error.setVisibility(data==LOAD_ERROR?View.VISIBLE:View.GONE);rl_more_loading.setVisibility(data==HAS_MORE?View.VISIBLE:View.GONE);}}

DefaultAdapter.java

package com.ldw.market.Adapter;import java.util.List;import com.ldw.market.domain.AppInfo;import com.ldw.market.holder.BaseHolder;import com.ldw.market.holder.MoreHolder;import com.ldw.market.manager.ThreadManager;import com.ldw.market.utils.UiUtils;import android.view.View;import android.view.ViewGroup;import android.widget.AdapterView;import android.widget.AdapterView.OnItemClickListener;import android.widget.BaseAdapter;import android.widget.ListView;import android.widget.Toast;/* * BaseAdapter的共性方法的封装,使用泛型封装 */public abstract class DefaultAdapter<Data> extends BaseAdapter implements OnItemClickListener {protected List<Data> datas;private static final int DEFAULT_ITEM = 0;//普通的条目private static final int MORE_ITEM = 1;//加载更多的条目private ListView lv;//get方法public List<Data> getDatas() {return datas;}//set方法public void setDatas(List<Data> datas) {this.datas = datas;}//构造函数，初始化数据public DefaultAdapter(List<Data> datas, ListView lv) {this.datas = datas;//ListView添加条目点击事件lv.setOnItemClickListener(this);this.lv =lv;}// ListView 条目点击事件回调的方法@Overridepublic void onItemClick(AdapterView<?> parent, View view, int position,long id) {//Toast.makeText(UiUtils.getContext(), "position:"+position, 0).show();position=position-lv.getHeaderViewsCount();// 获取到顶部条目的数量   位置去掉顶部view的数量onInnerItemClick(position);}/**在该方法去处理条目的点击事件*/public void onInnerItemClick(int position) {}//ListView条目事件的回调方法@Overridepublic int getCount() {// +1是尾部添加一个加载更多return datas.size() + 1;}@Overridepublic Object getItem(int position) {// TODO Auto-generated method stubreturn datas.get(position);}/** 根据位置 判断当前条目是什么类型 */@Overridepublic int getItemViewType(int position) {if (position == datas.size()) { // 当前是最后一个条目，加载更多return MORE_ITEM;}// 如果不是最后一个条目 返回默认类型return getInnerItemViewType(position);}protected int getInnerItemViewType(int position) {// 返回默认类型return DEFAULT_ITEM;}/** 当前ListView 有几种不同的条目类型 ,默认只有一种Holder*/@Overridepublic int getViewTypeCount() {// TODO Auto-generated method stubreturn super.getViewTypeCount()+ 1; // 2 有两种不同的类型}@Overridepublic long getItemId(int position) {// TODO Auto-generated method stubreturn position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {//BaseHolder使用泛型以支持多种数据类型的HolderBaseHolder holder = null;//当前是最后的一个位置显示加载更多MoreHolderswitch (getItemViewType(position)) {  // 判断当前条目时什么类型case MORE_ITEM://从MoreHolder中获取Holderif(convertView==null){//加载更多holder=getMoreHolder();}else{//缓冲中获取holder=(BaseHolder) convertView.getTag();}break;default://从默认中获取Holderif (convertView == null) {holder = getHolder();} else {holder = (BaseHolder) convertView.getTag();}if (position < datas.size()) {holder.setData(datas.get(position));}break;}//  如果当前Holder 恰好是MoreHolder  证明MoreHOlder已经显示return holder.getContentView();}private MoreHolder holder;private BaseHolder getMoreHolder() {if(holder!=null){return holder;}else{holder=new MoreHolder(this, hasMore());return holder;}}//默认有额外数据protected boolean hasMore() {return true;}protected abstract BaseHolder<Data> getHolder();//当加载更多条目显示的时候 调用该方法public void loadMore() {ThreadManager.getInstance().createLongPool().execute(new Runnable() {@Overridepublic void run() {// 在子线程中加载更多 final List<Data> newData = onload();//主线程刷新界面UiUtils.runOnUiThread(new Runnable() {@Overridepublic void run() {//链接服务器失败if(newData==null){holder.setData(MoreHolder.LOAD_ERROR); }else if(newData.size()==0){//没有数据了holder.setData(MoreHolder.HAS_NO_MORE);}else{// 成功了，加载更多数据holder.setData(MoreHolder.HAS_MORE);datas.addAll(newData);//  给listView之前的集合添加一个新的集合notifyDataSetChanged();// 刷新界面}}});}});}/** * 加载更多数据 */protected  abstract List<Data> onload();}

显示的界面有Title和图片2个部分，2个不同的Holder，根据之前解析的数据，判断当前是不是Title，如果是title的数据就显示Title的Hooder,反之显示图片的Holder

CategoryFragment.java

package com.ldw.market.fragment;import java.util.List;import com.ldw.market.Adapter.DefaultAdapter;import com.ldw.market.domain.CategoryInfo;import com.ldw.market.holder.BaseHolder;import com.ldw.market.holder.CategoryContentHolder;import com.ldw.market.holder.CategoryTitleHolder;import com.ldw.market.protocol.CategoryProtocol;import com.ldw.market.utils.UiUtils;import com.ldw.market.view.BaseListView;import com.ldw.market.view.LoadingPage.LoadResult;import android.os.Bundle;import android.support.v4.app.Fragment;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.ListView;import android.widget.TextView;public class CategoryFragment extends BaseFragment1 {private List<CategoryInfo> datas;public static int ITEM_TITLE =2;//标题类型的数据//创建成功界面@Overridepublic View createSuccessView() {BaseListView listView = new BaseListView(UiUtils.getContext());listView.setAdapter(new CategoryAdapter(datas, listView));return listView;}private class CategoryAdapter extends DefaultAdapter<CategoryInfo>{private int position;// 当前条目位置记录public CategoryAdapter(List<CategoryInfo> datas, ListView lv) {super(datas, lv);// TODO Auto-generated constructor stub}//实现条目的界面@Overrideprotected BaseHolder<CategoryInfo> getHolder() {//根据返回的type类型来显示不同的类型if (!datas.get(position).isTitle()) {return new CategoryContentHolder();}else{return new CategoryTitleHolder();}}//获取到position位置的条目@Overridepublic View getView(int position, View convertView, ViewGroup parent) {this.position = position;return super.getView(position, convertView, parent);}//false，没有额外的数据，不会调用onload@Overrideprotected boolean hasMore() {// TODO Auto-generated method stubreturn false;}//根据位置返回不同的类型@Overrideprotected int getInnerItemViewType(int position) {//如果是标题的时候if (datas.get(position).isTitle()) {return ITEM_TITLE;} else {return super.getInnerItemViewType(position);}}//加载更多的holder，这里不会被调用@Overrideprotected List<CategoryInfo> onload() {// TODO Auto-generated method stubreturn null;}//获取到当前有几种类型的数据，默认是1种// 又额外多了一种条目类型  现在又三种  1 标题 2 内容 3 加载更多(没有显示)@Overridepublic int getViewTypeCount() {// TODO Auto-generated method stubreturn super.getViewTypeCount() + 1;}}//请求服务器数据@Overrideprotected LoadResult load() {CategoryProtocol protocol = new CategoryProtocol();datas = protocol.load(0);return checkData(datas);}}

CategoryTitleHolder.java标题的Holder

package com.ldw.market.holder;import android.graphics.Color;import android.view.View;import android.widget.TextView;import com.ldw.market.R;import com.ldw.market.domain.CategoryInfo;import com.ldw.market.utils.UiUtils;public class CategoryTitleHolder extends BaseHolder<CategoryInfo> {private TextView tv;@Overridepublic View initView() {tv = new TextView(UiUtils.getContext());tv.setTextColor(Color.BLACK);tv.setBackgroundDrawable(UiUtils.getDrawalbe(R.drawable.grid_item_bg));return tv;}@Overridepublic void refreshView(CategoryInfo data) {tv.setText(data.getTitle());}}

CategoryContentHolder.java内容图片的Holder

package com.ldw.market.holder;import com.ldw.market.R;import com.ldw.market.domain.CategoryInfo;import com.ldw.market.http.HttpHelper;import com.ldw.market.utils.UiUtils;import android.text.TextUtils;import android.view.View;import android.widget.ImageView;import android.widget.TextView;public class CategoryContentHolder extends BaseHolder<CategoryInfo>{ImageView [] ivs;TextView [] tvs;@Overridepublic View initView() {View view=UiUtils.inflate(R.layout.item_category_content);//默认的item是有3个imageView和3个textViewivs=new ImageView[3];ivs[0]=(ImageView) view.findViewById(R.id.iv_1);ivs[1]=(ImageView) view.findViewById(R.id.iv_2);ivs[2]=(ImageView) view.findViewById(R.id.iv_3);tvs=new TextView[3];tvs[0]=(TextView) view.findViewById(R.id.tv_1);tvs[1]=(TextView) view.findViewById(R.id.tv_2);tvs[2]=(TextView) view.findViewById(R.id.tv_3);return view;}//注意有的item并不是一行有3个控件@Overridepublic void refreshView(CategoryInfo data) {// 图片的描述和图片的地址都不是空的时候，需要设置内容，不然就是一个空块if(!TextUtils.isEmpty(data.getName1())&&!TextUtils.isEmpty(data.getUrl1())){tvs[0].setText(data.getName1());bitmapUtils.display(ivs[0], HttpHelper.URL+"image?name="+data.getUrl1());tvs[0].setVisibility(View.VISIBLE);ivs[0].setVisibility(View.VISIBLE);}else{tvs[0].setVisibility(View.INVISIBLE);ivs[0].setVisibility(View.INVISIBLE);}// 第二块，第一块是空的后面就没有必要显示if(!TextUtils.isEmpty(data.getName2())&&!TextUtils.isEmpty(data.getUrl2())){tvs[1].setText(data.getName2());bitmapUtils.display(ivs[1], HttpHelper.URL+"image?name="+data.getUrl2());tvs[1].setVisibility(View.VISIBLE);ivs[1].setVisibility(View.VISIBLE);}else{tvs[1].setVisibility(View.INVISIBLE);ivs[1].setVisibility(View.INVISIBLE);}//第三块if(!TextUtils.isEmpty(data.getName3())&&!TextUtils.isEmpty(data.getUrl3())){tvs[2].setText(data.getName3());bitmapUtils.display(ivs[2], HttpHelper.URL+"image?name="+data.getUrl3());tvs[2].setVisibility(View.VISIBLE);ivs[2].setVisibility(View.VISIBLE);}else{tvs[2].setVisibility(View.INVISIBLE);ivs[2].setVisibility(View.INVISIBLE);}}}