package org.yczbj.ycrefreshview.staggered;
import android.content.Context;
import android.os.Handler;
import android.os.Looper;
import android.support.annotation.NonNull;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import com.bumptech.glide.Glide;
import org.yczbj.ycrefreshview.R;
import org.yczbj.ycrefreshview.data.PersonData;
import org.yczbj.ycrefreshviewlib.inter.OnItemClickListener;
import java.util.ArrayList;
import java.util.List;
public class StageredLoadMoreAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context mContext;
private OnItemClickListener listener;
/**
* 第一种ViewType，正常的item
*/
private int normalType = 0;
/**
* 第二种ViewType，底部的提示View
*/
private int footType = 1;
/**
* 变量，是否有更多数据
*/
private boolean hasMore;
/**
* 变量，是否隐藏了底部的提示
*/
private boolean fadeTips = false;
/**
* 获取主线程的Handler
*/
private Handler mHandler = new Handler(Looper.getMainLooper());
public StageredLoadMoreAdapter(Context context, boolean hasMore) {
this.mContext = context;
this.hasMore = hasMore;
}
private List<PersonData> data = new ArrayList<>();
public void setData(List<PersonData> data) {
this.data = data;
notifyDataSetChanged();
}
public void setOnClickListener(OnItemClickListener listener) {
this.listener = listener;
}
/**
* 暴露接口，改变fadeTips的方法
*/
public boolean isFadeTips() {
return fadeTips;
}
/**
* 暴露接口，更新数据源，并修改hasMore的值，如果有增加数据，hasMore为true，否则为false
*/
public void updateList(List<PersonData> newDatas, boolean hasMore) {
int size = data.size();
// 在原有的数据之上增加新数据
if (newDatas != null) {
data.addAll(newDatas);
this.hasMore = hasMore;
notifyItemRangeInserted(size,newDatas.size());
}
}
/**
* 自定义方法，获取列表中数据源的最后一个位置，比getItemCount少1，因为不计上footView
*/
public int getRealLastPosition() {
return data.size();
}
@Override
public void onViewAttachedToWindow(RecyclerView.ViewHolder holder) {
super.onViewAttachedToWindow(holder);
ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
if (layoutParams != null && layoutParams instanceof StaggeredGridLayoutManager.LayoutParams) {
StaggeredGridLayoutManager.LayoutParams params = (StaggeredGridLayoutManager.LayoutParams) layoutParams;
int position = holder.getLayoutPosition();
//如果是上拉加载更多类型，则设置setFullSpan为true，那么它就会占一行
if (getItemViewType(position) == footType) {
params.setFullSpan(true);
}
}
}
@NonNull
@Override
public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
// 根据返回的ViewType，绑定不同的布局文件，这里只有两种
if (viewType == normalType) {
return new MyViewHolder(LayoutInflater.from(mContext)
.inflate(R.layout.item_image, parent,false));
} else {
//这个是上拉加载更多的view
return new FootHolder(LayoutInflater.from(mContext)
.inflate(R.layout.view_more, parent,false));
}
}
@Override
public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
if (holder instanceof MyViewHolder){
PersonData person = data.get(position);
setBindViewHolder((MyViewHolder)holder,person,position);
}else {
setFootBindViewHolder((FootHolder)holder ,position);
}
}
/**
* 获取条目数量，之所以要加1是因为增加了一条footView
*/
@Override
public int getItemCount() {
return data == null ? 0 : data.size()+1;
}
/**
* 根据条目位置返回ViewType，以供onCreateViewHolder方法内获取不同的Holder
*/
@Override
public int getItemViewType(int position) {
if (position == getItemCount() - 1) {
return footType;
} else {
return normalType;
}
}
class MyViewHolder extends RecyclerView.ViewHolder {
private ImageView iv_news_image;
MyViewHolder(final View itemView) {
super(itemView);
iv_news_image = itemView.findViewById(R.id.iv_news_image);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (listener != null) {
listener.onItemClick(getAdapterPosition());
}
}
});
}
}
class FootHolder extends RecyclerView.ViewHolder {
private TextView tv_more;
FootHolder(View itemView) {
super(itemView);
tv_more = itemView.findViewById(R.id.tv_more);
}
}
private void setBindViewHolder(MyViewHolder holder, PersonData person, int position) {
ViewGroup.LayoutParams params = holder.iv_news_image.getLayoutParams();
int setHeight = position%5;
//计算View的高度
int height = 300;
switch (setHeight){
case 0:
height = 500;
break;
case 1:
height = 750;
break;
case 2:
height = 880;
break;
case 3:
height = 360;
break;
case 4:
height = 660;
break;
default:
break;
}
params.height = height;
holder.iv_news_image.setLayoutParams(params);
Glide.with(holder.iv_news_image.getContext())
.load(person.getImage())
.error(R.drawable.bg_small_tree_min)
.placeholder(R.drawable.bg_small_tree_min)
.into(holder.iv_news_image);
}
private void setFootBindViewHolder(final FootHolder holder, int position) {
// 之所以要设置可见，是因为我在没有更多数据时会隐藏了这个footView
holder.tv_more.setVisibility(View.VISIBLE);
// 只有获取数据为空时，hasMore为false，所以当我们拉到底部时基本都会首先显示“正在加载更多...”
if (hasMore) {
// 不隐藏footView提示
fadeTips = false;
if (data.size() > 0) {
// 如果查询数据发现增加之后，就显示正在加载更多
holder.tv_more.setText("逗比，正在加载更多...");
}
} else {
if (data.size() > 0) {
// 如果查询数据发现并没有增加时，就显示没有更多数据了
holder.tv_more.setText("逗比，没有更多数据了");
// 然后通过延时加载模拟网络请求的时间，在500ms后执行
mHandler.postDelayed(new Runnable() {
@Override
public void run() {
// 隐藏提示条
holder.tv_more.setVisibility(View.GONE);
// 将fadeTips设置true
fadeTips = true;
// hasMore设为true是为了让再次拉到底时，会先显示正在加载更多
hasMore = true;
}
}, 500);
}
}
}
}
