10. 面向holder编程、自动轮询

没有看过上一篇文章的话，建议先去阅读GooglePlay:9.代码抽取（adapter）

项目框架的搭建：

以后每个view都是holder

BaseHolder

1. public abstract class BaseHolder<Data>  {／／写data和t一样
   	private View contentView;
   	private Data data;
   	protected BitmapUtils bitmapUtils;
   	public BaseHolder(){
   		bitmapUtils = BitmapHelper.getBitmapUtils();
   		contentView=initView();
   		contentView.setTag(this);
   	}
   	/** 创建界面*/
   	public  abstract View initView();
   	public View getContentView() {
   		return contentView;
   	}
   	public void setData(Data data){
   		this.data=data;
   		refreshView(data);
   	}
   	/** 根据数据刷新界面*/
   	public abstract void refreshView(Data data);
   }

MoreHolder 

1. 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;
   
   	/**当Holder显示的时候 显示什么样子*/
   	@Override
   	public View initView() {
   		View view=UiUtils.inflate(R.layout.load_more);
   		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;
   
   	public MoreHolder(DefaultAdapter adapter) {
   		super();
   		this.adapter=adapter;
   
   	}
   	@Override
   	public View getContentView() {
   		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();
   	}
   	/**根据数据做界面的修改*/
   	@Override
   	public 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 ： 多种不同类型条目的ListView 

1. public abstract class DefaultAdapter<Data> extends BaseAdapter {
   	protected List<Data> datas;
   	private static final int DEFAULT_ITEM = 0;
   	private static final int MORE_ITEM = 1;
   	public List<Data> getDatas() {
   		return datas;
   	}
   	public void setDatas(List<Data> datas) {
   		this.datas = datas;
   	}
   	public DefaultAdapter(List<Data> datas) {
   		this.datas = datas;
   	}
   	@Override
   	public int getCount() {
   		return datas.size() + 1; // 最后的一个条目 就是加载更多的条目
   	}
   	@Override
   	public Object getItem(int position) {
   		return datas.get(position);
   	}
   	/** 根据位置 判断当前条目是什么类型 */
   	@Override
   	public int getItemViewType(int position) {  //20
   		if (position == datas.size()) { // 当前是最后一个条目
   			return MORE_ITEM;
   		}
   		return getInnerItemViewType(position); // 如果不是最后一个条目 返回默认类型
   	}
   	private int getInnerItemViewType(int position) {
   		return DEFAULT_ITEM;
   	}
   	/** 当前ListView 有几种不同的条目类型 */
   	@Override
   	public int getViewTypeCount() {
   		return super.getViewTypeCount() + 1; // 2 有两种不同的类型
   	}
   	@Override
   	public long getItemId(int position) {
   		return position;
   	}
   	public View getView(int position, View convertView, ViewGroup parent) {
   		BaseHolder holder = null;
   		switch (getItemViewType(position)) {  // 判断当前条目时什么类型
   		case MORE_ITEM:
   			if(convertView==null){
   				holder=getMoreHolder();
   			}else{
   				holder=(BaseHolder) convertView.getTag();
   			}
   			break;
   		case DEFAULT_ITEM:
   			if (convertView == null) {
   				holder = getHolder();
   			} else {
   				holder = (BaseHolder) convertView.getTag();
   			}
   			if (position < datas.size()) {
   				holder.setData(datas.get(position));
   			}
   			break;
   		}
   		return holder.getContentView();  //  如果当前Holder 恰好是MoreHolder  证明MoreHOlder已经显示
   	}
   	private MoreHolder holder;
   	private BaseHolder getMoreHolder() {
   		if(holder!=null){
   			return holder;
   		}else{
   			holder=new MoreHolder(this);
   			return holder;
   		}
   	}
   	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() {
   
   			@Override
   			public void run() {
   				// 在子线程中加载更多
   				final List<Data> newData = onload();
   				UiUtils.runOnUiThread(new Runnable() {
   
   					@Override
   					public void run() {
   						if(newData==null){
   							holder.setData(MoreHolder.LOAD_ERROR);//
   						}else if(newData.size()==0){
   							holder.setData(MoreHolder.HAS_NO_MORE);
   						}else{
   							// 成功了
   							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();
   }

 

修改8的代码SubjectFragment

1. public class SubjectFragment extends BaseFragment {
   	private List<SubjectInfo> datas;
   	@Override
   	public View createSuccessView() {
   		BaseListView  listView=new BaseListView  (UiUtils.getContext());
   		listView.setAdapter(new SubjectAdapter(datas));
   		return listView;
   	}
   	private class SubjectAdapter extends DefaultAdapter<SubjectInfo>{
   		public SubjectAdapter(List<SubjectInfo> datas) {
   			super(datas);
   		}
   		@Override
   		protected BaseHolder<SubjectInfo> getHolder() {
   			return new SubjectHolder();
   		}
   		@Override
   		protected List<SubjectInfo> onload() {
   			SubjectProtocol protocol=new SubjectProtocol();
   			List<SubjectInfo> load = protocol.load(0);
   			datas.addAll(load);
   			return load;
   		}
   	}
   	class SubjectHolder extends BaseHolder<SubjectInfo>{
   		ImageView item_icon;
   		TextView item_txt;
   		@Override
   		public View initView() {
   			View contentView=UiUtils.inflate(R.layout.item_subject);
   			this.item_icon=(ImageView) contentView.findViewById(R.id.item_icon);
   			this.item_txt=(TextView) contentView.findViewById(R.id.item_txt);
   			return contentView;
   		}
   		@Override
   		public void refreshView(SubjectInfo data) {
   			this.item_txt.setText(data.getDes());
   			bitmapUtils.display(this.item_icon, HttpHelper.URL+"image?name="+data.getUrl());
   		}
   	}
   	@Override
   	protected LoadResult load() {
   		SubjectProtocol protocol=new SubjectProtocol();
   		datas = protocol.load(0);
   		return checkData(datas);
   	}
   }

都是首页、APP、游戏页面很相似，所有又可以抽取

ListBaseHolder 

public class ListBaseHolder extends BaseHolder<AppInfo> {
	ImageView item_icon;
	TextView item_title,item_size,item_bottom;
	RatingBar item_rating;

	public void refreshView(AppInfo data){
		this.item_title.setText(data.getName());// 设置应用程序的名字
		String size=Formatter.formatFileSize(UiUtils.getContext(), data.getSize());
		this.item_size.setText(size);
		this.item_bottom.setText(data.getDes());
		float stars = data.getStars();
		this.item_rating.setRating(stars); // 设置ratingBar的值
		String iconUrl = data.getIconUrl();  //http://127.0.0.1:8090/image?name=app/com.youyuan.yyhl/icon.jpg

		// 显示图片的控件
		bitmapUtils.display(this.item_icon, HttpHelper.URL+"image?name="+iconUrl);
	}
	@Override
	public View initView() {
		View contentView=View.inflate(UiUtils.getContext(), R.layout.item_app, null);
		this.item_icon=(ImageView) contentView.findViewById(R.id.item_icon);
		this.item_title=(TextView) contentView.findViewById(R.id.item_title);
		this.item_size=(TextView) contentView.findViewById(R.id.item_size);
		this.item_bottom=(TextView) contentView.findViewById(R.id.item_bottom);
		this.item_rating=(RatingBar) contentView.findViewById(R.id.item_rating);
		return contentView;
	}
}

ListBaseAdapter 

1. public abstract class ListBaseAdapter extends DefaultAdapter<AppInfo> {
   	public ListBaseAdapter(List<AppInfo> datas) {
   		super(datas);
   	}
   	@Override
   	protected BaseHolder<AppInfo> getHolder() {
   		return new ListBaseHolder();
   	}
   	@Override
   	protected abstract List<AppInfo> onload();
   
   }

GameFragment 

public class GameFragment extends BaseFragment {
	private List<AppInfo> datas;
	/**
	 * 加载成功的界面
	 */
	@Override
	public View createSuccessView() {
		BaseListView  listView=new BaseListView(UiUtils.getContext());
		listView.setAdapter(new ListBaseAdapter(datas){
			@Override
			protected List<AppInfo> onload() {
				GameProtocol protocol=new GameProtocol();
				List<AppInfo> load = protocol.load(datas.size());  //
				datas.addAll(load);
				return load;
			}

		});
		return listView;
	}
	/**
	 * 请求服务器加载数据
	 */
	@Override
	protected LoadResult load() {
		GameProtocol protocol=new GameProtocol();
		datas = protocol.load(0);
		return checkData(datas);
	}
}

AppFragment 

public class AppFragment extends BaseFragment {
	private List<AppInfo> datas;
	/**
	 * 当加载成功的时候 显示的界面
	 */
	@Override
	public View createSuccessView() {
		BaseListView  listView=new BaseListView(UiUtils.getContext());
		listView.setAdapter(new ListBaseAdapter(datas){
			@Override
			protected List<AppInfo> onload() {
				AppProtocol protocol=new AppProtocol();
				List<AppInfo> load = protocol.load(0);
				datas.addAll(load);
				return load;
			}

		});
		return listView;
	}
	/**
	 * 请求服务器 获取服务器的数据
	 */
	protected LoadResult load() {
		AppProtocol protocol=new AppProtocol();
		datas = protocol.load(0);
		return checkData(datas); // 检查数据 有三种结果  成功, 错误,空
	}
}

　　

首页有个几张图片的展示栏，所以又是一个holder

HomePictureHolder （自动轮询）

public class HomePictureHolder extends BaseHolder<List<String>> {
	/* 当new HomePictureHolder()就会调用该方法 */
	private ViewPager viewPager;
	private List<String> datas;
	@Override
	public View initView() {
		viewPager = new ViewPager(UiUtils.getContext());
		viewPager.setLayoutParams(new AbsListView.LayoutParams(
				LayoutParams.MATCH_PARENT, UiUtils
						.getDimens(R.dimen.home_picture_height)));／／转换成dp
		return viewPager;
	}
	/* 当 holder.setData 才会调用 */
	@Override
	public void refreshView(List<String> datas) {
		this.datas = datas;
		viewPager.setAdapter(new HomeAdapter());
		viewPager.setCurrentItem(2000*datas.size());// 设置起始的位置   Integer.Max_Vlue/2，这样开始位置也能向后划了
		viewPager.setOnTouchListener(new OnTouchListener() {

			@Override
			public boolean onTouch(View v, MotionEvent event) {
				switch (event.getAction()) {
				case MotionEvent.ACTION_DOWN:
					runTask.stop();
					break;
// 事件的取消，有可能按下viewpager滑动到listview上停止就不轮播了
				case MotionEvent.ACTION_CANCEL:
				case MotionEvent.ACTION_UP:
					runTask.start();
					break;
				}

				return false; // viewPager 触摸事件 返回值要是false
			}
		});
		runTask = new AuToRunTask();
		runTask.start();
	}
	boolean flag;
	private AuToRunTask runTask;
//Runnable并不是开启子线程，所以可以在主线程运行，thread才是开启线程
	public class AuToRunTask implements Runnable{
		@Override
		public void run() {
			if(flag){
				UiUtils.cancel(this);  // 取消之前
				int currentItem = viewPager.getCurrentItem();
				currentItem++;
				viewPager.setCurrentItem(currentItem);
				//  延迟执行当前的任务
				UiUtils.postDelayed(this, 2000);// 递归调用
			}
		}
		public void start(){
			if(!flag){
				UiUtils.cancel(this);  // 取消之前
				flag=true;
				UiUtils.postDelayed(this, 2000);// 递归调用
			}
		}
		public  void stop(){
			if(flag){
				flag=false;
				UiUtils.cancel(this);
			}
		}

	}

	class HomeAdapter extends PagerAdapter {
		// 当前viewPager里面有多少个条目
		LinkedList<ImageView> convertView=new LinkedList<ImageView>();
		// ArrayList
		@Override
		public int getCount() {
			return	Integer.MAX_VALUE;／／这样写条目就能一直划了
		}
		/* 判断返回的对象和 加载view对象的关系 */
		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {
			return arg0 == arg1;
		}
		@Override
		public void destroyItem(ViewGroup container, int position, Object object) {
			ImageView view=(ImageView) object;
			convertView.add(view);// 把移除的对象 添加到缓存集合中
			container.removeView(view);
		}
		@Override
		public Object instantiateItem(ViewGroup container, int position) {
			int index=position%datas.size();／／访问网络需要这个参数
			ImageView view;
			if(convertView.size()>0){
				view=convertView.remove(0);
			}else{
				view= new ImageView(UiUtils.getContext());
			}
			bitmapUtils.display(view, HttpHelper.URL + "image?name="
					+ datas.get(index));
			container.addView(view); // 加载的view对象
			return view; // 返回的对象
		}
	}
}

 

UiUtils 添加这三个方法 

2.   /**
   	 * 延迟执行 任务
   	 * @param run   任务
   	 * @param time  延迟的时间
   	 */
   	public static void postDelayed(Runnable run, int time) {
   		BaseApplication.getHandler().postDelayed(run, time); // 调用Runable里面的run方法
   	}
   	/**
   	 * 取消任务
   	 * @param auToRunTask
   	 */
   	public static void cancel(Runnable auToRunTask) {
   		BaseApplication.getHandler().removeCallbacks(auToRunTask);
   	}
   
   }
   这样写获取到图片高的dp
    <dimen name="home_picture_height">134dp</dimen>
   public static int getDimens(int homePictureHeight) {
   		return (int) getResource().getDimension(homePictureHeight);
   	}

 

HomeFragment 

public class HomeFragment extends BaseFragment {
	private List<AppInfo> datas;
	private List<String> pictures; //  顶部ViewPager 显示界面的数据

	// 当Fragment挂载的activity创建的时候调用
	@Override
	public void onActivityCreated(Bundle savedInstanceState) {
		super.onActivityCreated(savedInstanceState);
		show();
	}
	public View createSuccessView() {
		BaseListView listView=new BaseListView(UiUtils.getContext());
		HomePictureHolder holder=new HomePictureHolder();
		holder.setData(pictures);
		View contentView = holder.getContentView(); // 得到holder里面管理的view对象
		//contentView.setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));
		listView.addHeaderView(contentView); // 把holder里的view对象 添加到listView的上面

		listView.setAdapter(new ListBaseAdapter(datas,listView){
			@Override
			protected List<AppInfo> onload() {
				HomeProtocol protocol=new HomeProtocol();
				List<AppInfo> load = protocol.load(datas.size());
				datas.addAll(load);
				return load;
			}
			@Override
			public void onInnerItemClick(int position) {
				super.onInnerItemClick(position);
				Toast.makeText(getActivity(), "position:"+position, 0).show();
				AppInfo appInfo = datas.get(position);
				Intent intent=new Intent(UiUtils.getContext(), DetailActivity.class);
				intent.putExtra("packageName", appInfo.getPackageName());//将包名传到详情页，详情页访问网络用包名
				startActivity(intent);
			}

		});

		// 第二个参数 慢慢滑动的时候是否加载图片 false  加载   true 不加载
		//  第三个参数  飞速滑动的时候是否加载图片  true 不加载
		listView.setOnScrollListener(new PauseOnScrollListener(bitmapUtils, false, true));
		bitmapUtils.configDefaultLoadingImage(R.drawable.ic_default);  // 设置如果图片加载中显示的图片
        bitmapUtils.configDefaultLoadFailedImage(R.drawable.ic_default);// 加载失败显示的图片
		return listView;
	}

	public LoadResult load() {
		HomeProtocol protocol=new HomeProtocol();
		datas = protocol.load(0);  // load index 从哪个位置开始获取数据   0  20  40 60
		pictures = protocol.getPictures();
		return checkData(datas);
	}
}

 

修改DefaultAdapter，这样传调到详情页面的时候position

已经是修改过的了，我们并不希望去点首页的图片展示

1. 	public DefaultAdapter(List<Data> datas,ListView lv) {
   		this.datas = datas;
   		// 给ListView设置条目的点击事件
   		lv.setOnItemClickListener(this);
   		this.lv=lv;
   	}
   
   	// ListView 条目点击事件回调的方法
   	@Override
   	public 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) {
   
   	}

 

面向holder编程

1. 	public View createSuccessView() {
   			BaseListView listView=new BaseListView(UiUtils.getContext());
   			HomePictureHolder holder=new HomePictureHolder();
   			holder.setData(pictures);
   			View contentView = holder.getContentView(); // 得到holder里面管理的view对象
   			contentView.setLayoutParams(new AbsListView.LayoutParams(LayoutParams.MATCH_PARENT,LayoutParams.WRAP_CONTENT));
   			listView.addHeaderView(contentView); // 把holder里的view对象 添加到listView的上面