RecyclerView之ViewHolder封装实现点击、长按、headerView和多选功能

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多选效果图：

这里写图片描述

BaseRecyclerViewHolder类：

package com.danxx.brisktvlauncher.adapter;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.support.v7.widget.RecyclerView;import android.view.View;/** * Base RecyclerViewHolder * Created by Danxingxi on 2016/3/31. */public abstract class BaseRecyclerViewHolder extends RecyclerView.ViewHolder {    public BaseRecyclerViewHolder(View itemView) {        super(itemView);    }    protected abstract View getView();    /**     * 为item添加动画     * @param view 需要添加动画的item     * @param scale 是否得到焦点     */    public void animItem(View view,boolean scale){        float toValue = 1.0f;        if(scale) {  //得到焦点            toValue = 1.1f;            ObjectAnimator animatorX = ObjectAnimator.ofFloat(view, "scaleX", toValue);            ObjectAnimator animatorY = ObjectAnimator.ofFloat(view, "scaleY", toValue);            AnimatorSet animatorSet = new AnimatorSet();            animatorSet.setDuration(300);            animatorSet.playTogether(animatorX, animatorY);            animatorSet.start();        }else{   //失去焦点            ObjectAnimator animatorX = ObjectAnimator.ofFloat(view, "scaleX", toValue);            ObjectAnimator animatorY = ObjectAnimator.ofFloat(view, "scaleY", toValue);            AnimatorSet animatorSet = new AnimatorSet();            animatorSet.setDuration(300);            animatorSet.playTogether(animatorX, animatorY);            animatorSet.start();        }    }}

BaseRecyclerViewAdapter类：

package com.danxx.brisktvlauncher.adapter;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.util.SparseBooleanArray;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;import java.util.List;/** * Created by Danxingxi on 2016/3/31. */public abstract class BaseRecyclerViewAdapter< T > extends RecyclerView.Adapter<BaseRecyclerViewHolder>{    /**header view type**/    public static final int TYPE_HEADER = 0;    /**item view type**/    public static final int TYPE_NORMAL = 1;    private View mHeaderView;    public OnItemClickListener<T> mOnItemClickListener;    /**保存处于选中状态的itemView的position**/    private SparseBooleanArray selectedItems;//    private List<Model> mData = new ArrayList<Model>();////    public void setData(List<? extends Model> data){//        mData.clear();//        mData.addAll(data);//    }    public BaseRecyclerViewAdapter(){        selectedItems = new SparseBooleanArray();    }    private List< T > mData = new ArrayList< T >();    public void setData(List< T > data){        mData.clear();        mData.addAll(data);    }    public T getItemData(int position) {        T res = null;        /**计算正确的位置**/        int realPos  = (mHeaderView == null ? position : position - 1);        if(realPos < mData.size()) {            res = mData.get(realPos);        }        return res;    }    public void clearData(){        if(mData != null){            mData.clear();        }    }    public void setOnItemClickListener(OnItemClickListener li) {        mOnItemClickListener = li;    }    /**     * add header view     * @param headerView     */    public void setHeaderView(View headerView) {        mHeaderView = headerView;        notifyItemInserted(0);    }    /**     *  get header view     * @return     */    public View getHeaderView() {        return mHeaderView;    }    @Override    public int getItemViewType(int position) {        if(mHeaderView == null) return TYPE_NORMAL;        if(position == 0) return TYPE_HEADER;        return TYPE_NORMAL;    }    /**     * itemView的选中状态和非选中状态切换并及时更新UI状态     * 选中状态调用时就切换为非选中状态，反之对调状态     * @param position 用户点击的itemView的位置     */    public void toggleSelection(int position) {        if (selectedItems.get(position, false)) {            selectedItems.delete(position);        } else {            selectedItems.put(position, true);        }        /*这个更新UI会使焦点闪烁一下*///        notifyItemChanged(position);    }    /**     * 判断这个位置的item是处于选中状态     * @param position Position of the item to check     * @return true if the item is selected, false otherwise     */    public boolean isSelected(int position) {        return getSelectedItems().contains(position);    }    /**     * 清除所有Item的选中状态     */    public void clearSelection() {        List<Integer> selection = getSelectedItems();        selectedItems.clear();        notifyDataSetChanged();//        for (Integer i : selection) {//            notifyItemChanged(i);//        }    }    /**     * 获得所有选中状态item的position集合     * @return     */    public List<Integer> getSelectedItems() {        List<Integer> items = new ArrayList<> (selectedItems.size());        for (int i = 0; i < selectedItems.size(); ++i) {            /*我们使用keyAt可以取到position，当然也可以使用valueAt取到value值，显然这个集合中的value都为true*/            items.add(selectedItems.keyAt(i));        }        return items;    }    /**     * 获得item的位置     * @param holder     * @return     */    public int getRealPosition(BaseRecyclerViewHolder holder) {        int position = holder.getLayoutPosition();        return mHeaderView == null ? position : position - 1;    }    @Override    public BaseRecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        if(mHeaderView != null && viewType == TYPE_HEADER) return new HeaderViewHolder(mHeaderView);        return createItem(parent ,viewType);    }    @Override    public void onBindViewHolder(final BaseRecyclerViewHolder holder, int position) {        /**如果是header view就直接返回，不需要绑定数据**/        if(getItemViewType(position) == TYPE_HEADER) return;        final int pos = getRealPosition(holder);        final T data = mData.get(pos);        bindData(holder ,pos);        if(mOnItemClickListener != null) {            holder.itemView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    mOnItemClickListener.onItemClick(pos, data);                }            });            holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {                @Override                public boolean onLongClick(View view) {                    mOnItemClickListener.onItemLongClick(pos, data);                    return false;                }            });        }    }    @Override    public int getItemCount() {        return mHeaderView == null ? mData.size() : mData.size() + 1;    }    @Override    public void onAttachedToRecyclerView(RecyclerView recyclerView) {        super.onAttachedToRecyclerView(recyclerView);        RecyclerView.LayoutManager manager = recyclerView.getLayoutManager();        if(manager instanceof GridLayoutManager) {            final GridLayoutManager gridManager = ((GridLayoutManager) manager);            gridManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {                @Override                public int getSpanSize(int position) {                    return getItemViewType(position) == TYPE_HEADER                            ? gridManager.getSpanCount() : 1;                }            });        }    }    @Override    public void onViewAttachedToWindow(BaseRecyclerViewHolder holder) {        super.onViewAttachedToWindow(holder);        ViewGroup.LayoutParams lp = holder.itemView.getLayoutParams();        if(lp != null                && lp instanceof StaggeredGridLayoutManager.LayoutParams                && holder.getLayoutPosition() == 0) {            StaggeredGridLayoutManager.LayoutParams p = (StaggeredGridLayoutManager.LayoutParams) lp;            p.setFullSpan(true);        }    }    /**     * 创建item view     * @param parent     * @param viewType     * @return     */    protected  abstract BaseRecyclerViewHolder createItem(ViewGroup parent, int viewType);    /**     * 绑定数据     * @param holder     * @param position     */    protected abstract void bindData(BaseRecyclerViewHolder holder, int position);    /**     *header view ViewHolder     */    class HeaderViewHolder extends BaseRecyclerViewHolder {        public HeaderViewHolder(View itemView) {            super(itemView);        }        @Override        protected View getView() {            return null;        }    }    /**     * item 点击事件接口     * @param <T>     */    public interface OnItemClickListener<T> {        /**单击监听**/        void onItemClick(int position, T data);        /**长按监听**/        void onItemLongClick(int position, T data);    }}

用法请参考：https://github.com/Dawish/BriskTVLauncher/blob/master/app/src/main/java/com/danxx/brisktvlauncher/ui/ActivityManagerApp.java

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