DefaultAdapter.java

package com.hx.hxchat.adapter;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AbsListView.RecyclerListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.ListView;

import com.easemob.chat.EMGroup;
import com.hx.hxchat.holder.BaseHolder;
import com.hx.hxchat.holder.MoreHolder;
import com.mgw.member.manager.ThreadManager;
import com.mgw.member.uitls.UIUtils;

/**
 * Created by mwqi on 2014/6/8.
 */
public abstract class DefaultAdapter<Data> extends BaseAdapter implements RecyclerListener, OnItemClickListener {


	public DefaultAdapter(Context context, int resource, List<Data> datas,AbsListView listView) {
		super();
		mDisplayedHolders = new ArrayList<BaseHolder>();
		mListView = listView;
		if (null != listView) {
			//设置
			listView.setRecyclerListener(this);
			listView.setOnItemClickListener(this);
		}
		setData(datas);
	}

	public static final int MORE_VIEW_TYPE = 0;
	public static final int ITEM_VIEW_TYPE = 1;

	protected AbsListView mListView;//和该adapter关联的listView
	private List<BaseHolder> mDisplayedHolders;//用于记录所有显示的holder
	private List<Data> mDatas;//adapter的数据集
	private volatile boolean mIsLoading;
	private MoreHolder mMoreHolder;


	@Override
	public void onMovedToScrapHeap(View view) {
		if (null != view) {
			Object tag = view.getTag();
			if (tag instanceof BaseHolder) {
				BaseHolder holder = (BaseHolder) tag;
				synchronized (mDisplayedHolders) {
					mDisplayedHolders.remove(holder);
				}
				holder.recycle();
			}
		}
	}

	public List<BaseHolder> getDisplayedHolders() {
		synchronized (mDisplayedHolders) {
			return new ArrayList<BaseHolder>(mDisplayedHolders);
		}
	}

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

	public void setData(List<Data> datas) {
		mDatas = datas;
	}

	public List<Data> getData() {
		return mDatas;
	}

	@Override
	public int getCount() {
		if (mDatas != null) {
			return mDatas.size() + 1;// 加1是为了最后加载更多的布局
		}
		return 0;
	}

	@Override
	public Data getItem(int position) {
		if (mDatas != null && position < mDatas.size()) {
			return mDatas.get(position);
		}
		return null;
	}

	public int getHeaderViewCount() {
		int count = 0;
		if (mListView != null && mListView instanceof ListView) {
			ListView listView = (ListView) mListView;
			count = listView.getHeaderViewsCount();
		}
		return count;
	}
	// 获取item有几种类型，默认是一种类型，这里在加一是为了做加载更多。
	@Override
	public int getViewTypeCount() {
		return super.getViewTypeCount() + 1;// 加1是为了最后加载更多的布局
	}
	// 根据position位置返回哪种item展示类型
	@Override
	public int getItemViewType(int position) {
		if (position == getCount() - 1) {
			return MORE_VIEW_TYPE;// 加载更多的布局
		} else {
			return getItemViewTypeInner(position);
		}
	}

	public int getItemViewTypeInner(int position) {
		return ITEM_VIEW_TYPE;// 普通item的布局
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
		BaseHolder<Data> holder;
		if (convertView != null && convertView.getTag() instanceof BaseHolder) {
			holder = (BaseHolder<Data>) convertView.getTag();
			
		} else {
			if (getItemViewType(position) == MORE_VIEW_TYPE) {
				holder = getMoreHolder();
			} else {
				holder = getHolder();
				
			}
		
			
		}
		if (getItemViewType(position) == ITEM_VIEW_TYPE) {
			holder.setData(mDatas.get(position));
		}
		mDisplayedHolders.add(holder);
		return holder.getRootView();
	}

	protected abstract BaseHolder getHolder();

	public BaseHolder getMoreHolder() {
		if (mMoreHolder == null) {
			mMoreHolder = new MoreHolder(this, hasMore());
		}
		return mMoreHolder;
	}

	
	
	
	
	public void loadMore() {
		//防止重复加载
		if (!mIsLoading) {
			mIsLoading = true;
			ThreadManager.getLongPool().execute(new Runnable() {
				@Override
				public void run() {
					final List<Data> datas = onLoadMore();
					UIUtils.post(new Runnable() {
						@Override
						public void run() {
							if (datas == null) {
								getMoreHolder().setData(MoreHolder.ERROR);
							} else if (datas.size() < 20) {
								getMoreHolder().setData(MoreHolder.NO_MORE);
							} else {
								getMoreHolder().setData(MoreHolder.HAS_MORE);
							}
							if (datas != null) {
								if (getData() != null) {
									getData().addAll(datas);
								} else {
									setData(datas);
								}
							}
							notifyDataSetChanged();
							mIsLoading = false;
						}
					});
				}
			});
		}
	}

	public List<Data> onLoadMore() {
		return null;
	}

	public boolean hasMore() {
		return true;
	}

	@Override
	public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
		position = position - getHeaderViewCount();// 此时的position是加上了header的
		onItemClickInner(position);
	}

	public void onItemClickInner(int position) {

	}
}