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

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;

if(position < mData.size()) {
res = mData.get(position);
}

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