複雜ListVIew的多條目型別複用

即adapter、VIewHolder配合使用

· DefaultAdapter.java

public abstract class DefaultAdapter<Data> extends BaseAdapter implements AdapterView.OnItemClickListener {
//Data為泛型
    private static final int MORE_ITEM = 1;
    private static final int DEFAULT_ITEM = 0;
    private MoreHolder moreHolder;
    List<Data> datas ;
    private
 
 ListView listView;

    public DefaultAdapter(List<Data> datas,ListView listView) {
        this.datas = datas;
        listView.setOnItemClickListener(this);
        this.listView = listView;
    }

    public List<Data> getDatas() {
        return datas;
    }

    public void setDatas(List<Data> datas) {
        this
 
.datas = datas;
    }

    @Override
    public int getCount() {
        return datas.size()+1;//加1為普通條目數+載入更多的條目
    }

    @Override
    public Object getItem(int position) {
        return datas.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    /** 根據位置 判斷當前條目是什麼型別 */
 

    @Override
    public int getItemViewType(int position) {
        if(position == datas.size()){// 當前是最後一個條目
            return MORE_ITEM;
        }
        return getInnerItemViewType(position); // 如果不是最後一個條目 返回預設型別
    }
    /**子類Adapter可以覆寫該方法，可以繼續增加條目型別，返回不同的型別*/
    protected int getInnerItemViewType(int position) {
        return DEFAULT_ITEM;
    }

    /** 當前ListView 有幾種不同的條目型別 */
    @Override
    public int getViewTypeCount() {
        return super.getViewTypeCount()+1;//預設一種型別，+1就是2種類型
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        BaseHolder holder = null;
        switch (getItemViewType(position)) {  // 判斷當前條目時什麼型別
            case MORE_ITEM:
                if (convertView == null) {
                    holder = getMoreHolder();
                } else {
                    holder = (BaseHolder) convertView.getTag();
                }
                break;
            default:
                if (convertView == null) {
                    holder = getHolder();
                } else {
                    holder = (BaseHolder) convertView.getTag();
                }
                if (position < datas.size()) {
                    holder.setData(datas.get(position));
                }
                break;
        }
        return holder.getContentView();
    }


    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        position = position - listView.getHeaderViewsCount();// 獲取到頂部條目的數量   位置去掉頂部view的數量
        onInnerItemClick(position);
    }
    /**在該方法去處理條目的點選事件，可以在相應Fragment中覆寫，各個Fragment中listview的adapter都可以繼承DefaultAdapter*/
    public void onInnerItemClick(int position) {
    }

    /**
     * 是否有額外的資料，子類重寫就可以自定義是否顯示載入更多
     * @return
     */
    protected boolean hasMore() {
        return true;
    }
    /**
     *拿到MoreHolder物件
     */
    private BaseHolder getMoreHolder() {
        if(moreHolder!=null){
            return moreHolder;
        }else{
            moreHolder=new MoreHolder(this,hasMore());
            return moreHolder;
        }
    }

    public abstract BaseHolder<Data> getHolder();

    /**
     * 當載入更多條目顯示的時候 呼叫該方法
     * 呼叫onLoadMore方法訪問伺服器
     * runOnUiThread內顯示MoreHolder，notifyDataSetChanged();更新介面
     */
    public void loadMore() {
        ThreadManager.getInstance().createLongPool().execute(
                new Runnable() {
                    @Override
                    public void run() {
                        final List<Data> newData = onLoadMore();
                        UIutil.runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                if(newData == null){
                                    moreHolder.setData(moreHolder.LOAD_ERROR);
                                }else if(newData.size() == 0){
                                    moreHolder.setData(moreHolder.HAS_NO_MORE);
                                }else {
                                    moreHolder.setData(moreHolder.HAS_MORE);
                                    datas.addAll(newData);
                                    notifyDataSetChanged();
                                }
                            }
                        });
                    }
                }
        );
    }

    protected abstract List<Data> onLoadMore();
}

· BaseHolder的實現

package com.appstore.holder;
import android.view.View;
import com.appstore.utils.BitmapUtil;
import com.lidroid.xutils.BitmapUtils;

public abstract class BaseHolder<Data> {

    private View contentView;//與getView方法的convertView意義相同
    private Data data;
    protected BitmapUtils bitmapUtils;
    public BaseHolder(){
        bitmapUtils = BitmapUtil.getBitmap();
        contentView=initView();//初始化view
        contentView.setTag(this);//view與當前viewHolder繫結
    }
    /** 建立介面*/
    public  abstract View initView();
    /**給Adapter的getView方法返回一個與ViewHolder繫結好的並且初始化的View*/
    public View getContentView() {
        return contentView;
    }
    public void setData(Data data){
        this.data=data;
        refreshView(data);
    }
    /** 根據資料重新整理介面*/
    public abstract void refreshView(Data data);
}

· AppAdapter.java 繼承DefaultAdapter繼續實現細節

public abstract class AppAdapter extends DefaultAdapter<AppInfo> {
    public AppAdapter(List<AppInfo> appInfos, ListView listView) {
        super(appInfos,listView);
    }

    @Override
    public BaseHolder<AppInfo> getHolder() {
        return new AppHolder();//返回普通條目的ViewHolder物件
    }

    @Override
    protected abstract List<AppInfo> onLoadMore();

    /**點選listview條目繼續實現*/
    @Override
    public void onInnerItemClick(int position) {
        super.onInnerItemClick(position);
        Toast.makeText(UIutil.getContext(), "position:"+position, 0).show();
        AppInfo appInfo = datas.get(position);
        Intent intent=new Intent(UIutil.getContext(), DetailActivity.class);
        intent.putExtra("packageName", appInfo.getPackageName());
        UIutil.startActivity(intent);//實現點選listview條目activity跳轉
    }
}

· MoreHolder

public class MoreHolder extends BaseHolder<Integer> {

    public static final int HAS_NO_MORE = 0;
    public static final int LOAD_ERROR = 1;
    public static final int HAS_MORE = 2;

    private RelativeLayout loading_more,loadMore_error;

    private DefaultAdapter adapter;

    private boolean  hasMore;

    public MoreHolder(DefaultAdapter adapter,boolean hasMore) {
        super();
        this.adapter=adapter;
        this.hasMore = hasMore;
        /**當子類重寫的hasMore值為假時，setData在父類BaseHolder中內部呼叫refreshView，傳入0，對應靜態常量HAS_NO_MORE，不再顯示載入更多的介面*/
        if(!hasMore){
            setData(0);
        }
    }

    @Override
    public View initView() {
        View view = View.inflate(UIutil.getContext(), R.layout.load_more,null);
        loading_more = (RelativeLayout) view.findViewById(R.id.rl_more_loading);
        loadMore_error = (RelativeLayout) view.findViewById(R.id.rl_more_error);
        return view;
    }
/**是否顯示載入更多和載入更多失敗介面*/
    @Override
    public void refreshView(Integer integer) {
        loading_more.setVisibility(integer == HAS_MORE ? View.VISIBLE : View.GONE);
        loadMore_error.setVisibility(integer == LOAD_ERROR ? View.VISIBLE : View.GONE);
    }
/***/
    @Override
    public View getContentView() {
        if(hasMore) {
            loadMore();
        }
        return super.getContentView();
    }

    private void loadMore() {
        // 請求伺服器   載入下一批資料
        //  交給DefaultAdapter  讓Adapter載入更多資料
        adapter.loadMore();
    }
}

· HomePictureHolder 再給listview加個頭部。實現如圖

Code：

package com.appstore.holder;

import android.app.ActionBar;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.ImageView;

import com.appstore.R;
import com.appstore.utils.UIutil;

import java.util.LinkedList;
import java.util.List;

public class HomePictureHolder extends BaseHolder<List<String>> {
    private ViewPager viewPager;
    private List<String> datas;

    private AutoRunTask autoRunTask;
    boolean flag;
    @Override
    public View initView() {
        viewPager = new ViewPager(UIutil.getContext());
        viewPager.setLayoutParams(new AbsListView.LayoutParams(ActionBar.LayoutParams.MATCH_PARENT,
                UIutil.getDimen(R.dimen.home_headItem_height)));
        return viewPager;
    }

    @Override
    public void refreshView(List<String> strings) {

        this.datas = strings;
        viewPager.setAdapter(new picAdapter());//輪播圖
        viewPager.setCurrentItem(Integer.MAX_VALUE / 2);

        viewPager.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch(event.getAction()){
                    case MotionEvent.ACTION_DOWN:
                        autoRunTask.stop();
                        break;
                    case MotionEvent.ACTION_CANCEL:
                    case MotionEvent.ACTION_UP:
                        autoRunTask.start();
                        break;

                }
                return false; // viewPager 觸控事件 返回值要是false
            }
        });

        autoRunTask = new AutoRunTask();
        autoRunTask.start();

    }

    class picAdapter extends PagerAdapter{
        // 當前viewPager裡面有多少個條目
        LinkedList<ImageView> imageViews = new LinkedList<>();
        @Override
        public int getCount() {
            return Integer.MAX_VALUE;
        }

        /* 判斷返回的物件和 載入view物件的關係 */
        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }

        @Override
        public void destroyItem(ViewGroup container, int position, Object object) {
            ImageView view = (ImageView) object;
            imageViews.add(view);// 把移除的物件 新增到快取集合中
            container.removeView((View) object);
        }

        @Override
        public Object instantiateItem(ViewGroup container, int position) {
            int index = position % datas.size();
            ImageView imageView;
            if(imageViews.size() > 0){
                imageView = imageViews.remove(0);
            }else {
                imageView = new ImageView(UIutil.getContext());
            }
            bitmapUtils.display(imageView,"http://127.0.0.1:8090/image?name="+datas.get(index));
            container.addView(imageView);
            return imageView;
        }
    }

    /**自動輪詢*/
    class AutoRunTask implements Runnable{

        @Override
        public void run() {
            if(flag){
                UIutil.cancel(this);
                int currentItem = viewPager.getCurrentItem();
                currentItem ++;
                viewPager.setCurrentItem(currentItem);
                UIutil.postDelayed(this,2000);
            }

        }

        public void start(){
            if(!flag){
                UIutil.cancel(this);  // 取消之前
                flag = true;
                UIutil.postDelayed(this, 2000);// 遞迴呼叫
            }
        }

        public void stop(){
            if(flag) {
                flag = false;
                UIutil.cancel(this);
            }
        }
    }
}

· 最後 HomeFragment中例項化listview

@Override
    public View onCreateView(LayoutInflater inflater,  ViewGroup container,  Bundle savedInstanceState) {
BaseListView mListView = new BaseListView(getContext());

        HomePictureHolder picHolder = new HomePictureHolder();
        picHolder.setData(pictures);
        View contentView = picHolder.getContentView();
        mListView.addHeaderView(contentView);

        mListView.setAdapter(new AppAdapter(datas,mListView) {
            @Override
            protected List<AppInfo> onLoadMore() {
                HomeProtocol protocol = new HomeProtocol();
                List<AppInfo> list = protocol.load(datas.size());
                datas.addAll(list);
                return list;
            }
        });
        bitmapUtils = BitmapUtil.getBitmap();
        // 第二個引數 慢慢滑動的時候是否載入圖片 false  載入   true 不載入
        //  第三個引數  飛速滑動的時候是否載入圖片  true 不載入
        mListView.setOnScrollListener(new PauseOnScrollListener(bitmapUtils,false,true));
        bitmapUtils.configDefaultLoadingImage(R.drawable.ic_default);
        bitmapUtils.configDefaultLoadFailedImage(R.drawable.ic_default);
        return mListView;
}

· 這裡繼續增加listview的第三種條目型別。實現這種效果

• CategoryFragment

public class CategoryFragment extends BaseFragment {

    private List<CategoryInfo> datas;
    public static int ITEM_TITLE =2;

    // 建立成功的介面
    @Override
    public View onCreateView() {
        BaseListView listView = new BaseListView(UIutil.getContext());
        listView.setAdapter(new CategoryAdapter(datas, listView));
        return listView;
    }

    private class CategoryAdapter extends DefaultAdapter<CategoryInfo> {
        private int position;// 當前條目位置記錄
        public CategoryAdapter(List<CategoryInfo> datas, ListView lv) {
            super(datas, lv);
        }

        // 實現每個條目的介面
        @Override
        public BaseHolder<CategoryInfo> getHolder() {
            if (!datas.get(position).isTitle()) {
                return new CategoryContentHolder();
            }else{
                return new CategoryTitleHolder();
            }
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            this.position = position;
            return super.getView(position, convertView, parent);
        }

        @Override
        protected boolean hasMore() { // 當前方法 如果為false onload就不會被呼叫了
            return false;
        }

        @Override
        protected int getInnerItemViewType(int position) {
            if (datas.get(position).isTitle()) {
                return ITEM_TITLE;
            } else {
                return super.getInnerItemViewType(position);
            }
        }

        @Override
        protected List<CategoryInfo> onLoadMore() {
            return null;
        }
        //  集合 管理三個convertView
        @Override
        public int getViewTypeCount() {
            return super.getViewTypeCount() + 1; // 又額外多了一種條目型別  現在又三種  1 標題 2 內容 3 載入更多(沒有顯示)
        }
    }