package com.moral.andbrickslib.baseadapter.headandfooter;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.StaggeredGridLayoutManager;
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import android.view.View;
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import android.view.ViewGroup;
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import java.util.ArrayList;
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/**
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* Created by cundong on 2015/10/9.
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* <p/>
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* RecyclerView.Adapter with Header and Footer
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*/
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public class HeaderAndFooterRecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
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private static final int TYPE_HEADER_VIEW = Integer.MIN_VALUE;
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private static final int TYPE_FOOTER_VIEW = Integer.MIN_VALUE + 1;
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/**
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* RecyclerView使用的，真正的Adapter
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*/
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private RecyclerView.Adapter<RecyclerView.ViewHolder> mInnerAdapter;
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private ArrayList<View> mHeaderViews = new ArrayList<>();
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private ArrayList<View> mFooterViews = new ArrayList<>();
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private RecyclerView.AdapterDataObserver mDataObserver = new RecyclerView.AdapterDataObserver() {
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@Override
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public void onChanged() {
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super.onChanged();
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notifyDataSetChanged();
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}
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@Override
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public void onItemRangeChanged(int positionStart, int itemCount) {
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super.onItemRangeChanged(positionStart, itemCount);
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notifyItemRangeChanged(positionStart + getHeaderViewsCount(), itemCount);
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}
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@Override
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public void onItemRangeInserted(int positionStart, int itemCount) {
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super.onItemRangeInserted(positionStart, itemCount);
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notifyItemRangeInserted(positionStart + getHeaderViewsCount(), itemCount);
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}
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@Override
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public void onItemRangeRemoved(int positionStart, int itemCount) {
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super.onItemRangeRemoved(positionStart, itemCount);
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notifyItemRangeRemoved(positionStart + getHeaderViewsCount(), itemCount);
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}
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@Override
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public void onItemRangeMoved(int fromPosition, int toPosition, int itemCount) {
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super.onItemRangeMoved(fromPosition, toPosition, itemCount);
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int headerViewsCountCount = getHeaderViewsCount();
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notifyItemRangeChanged(fromPosition + headerViewsCountCount, toPosition + headerViewsCountCount + itemCount);
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}
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};
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public HeaderAndFooterRecyclerViewAdapter() {
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}
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public HeaderAndFooterRecyclerViewAdapter(RecyclerView.Adapter innerAdapter) {
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setAdapter(innerAdapter);
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}
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/**
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* 设置adapter
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* @param adapter
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*/
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public void setAdapter(RecyclerView.Adapter<RecyclerView.ViewHolder> adapter) {
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if (adapter != null) {
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if (!(adapter instanceof RecyclerView.Adapter))
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throw new RuntimeException("your adapter must be a RecyclerView.Adapter");
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}
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if (mInnerAdapter != null) {
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notifyItemRangeRemoved(getHeaderViewsCount(), mInnerAdapter.getItemCount());
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mInnerAdapter.unregisterAdapterDataObserver(mDataObserver);
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}
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this.mInnerAdapter = adapter;
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mInnerAdapter.registerAdapterDataObserver(mDataObserver);
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notifyItemRangeInserted(getHeaderViewsCount(), mInnerAdapter.getItemCount());
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}
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public RecyclerView.Adapter getInnerAdapter() {
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return mInnerAdapter;
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}
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public void addHeaderView(View header) {
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if (header == null) {
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throw new RuntimeException("header is null");
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}
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if(mHeaderViews.size()!=0){
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return;
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}
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mHeaderViews.add(header);
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this.notifyDataSetChanged();
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}
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public void addFooterView(View footer) {
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if (footer == null) {
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throw new RuntimeException("footer is null");
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}
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if(mFooterViews.size()!=0){
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return;
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}
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mFooterViews.add(footer);
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this.notifyDataSetChanged();
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}
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/**
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* 返回第一个FoView
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* @return
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*/
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public View getFooterView() {
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return getFooterViewsCount()>0 ? mFooterViews.get(0) : null;
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}
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/**
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* 返回第一个HeaderView
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* @return
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*/
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public View getHeaderView() {
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return getHeaderViewsCount()>0 ? mHeaderViews.get(0) : null;
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}
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public void removeHeaderView(View view) {
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mHeaderViews.remove(view);
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this.notifyDataSetChanged();
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}
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public void removeFooterView(View view) {
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mFooterViews.remove(view);
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this.notifyDataSetChanged();
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}
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public int getHeaderViewsCount() {
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return mHeaderViews.size();
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}
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public int getFooterViewsCount() {
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return mFooterViews.size();
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}
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public boolean isHeader(int position) {
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return getHeaderViewsCount() > 0 && position == 0;
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}
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public boolean isFooter(int position) {
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int lastPosition = getItemCount() - 1;
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return getFooterViewsCount() > 0 && position == lastPosition;
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}
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@Override
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public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
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int headerViewsCountCount = getHeaderViewsCount();
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if (viewType < TYPE_HEADER_VIEW + headerViewsCountCount) {
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return new ViewHolder(mHeaderViews.get(viewType - TYPE_HEADER_VIEW));
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} else if (viewType >= TYPE_FOOTER_VIEW && viewType < Integer.MAX_VALUE / 2) {
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return new ViewHolder(mFooterViews.get(viewType - TYPE_FOOTER_VIEW));
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} else {
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return mInnerAdapter.onCreateViewHolder(parent, viewType - Integer.MAX_VALUE / 2);
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}
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}
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@Override
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public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
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int headerViewsCountCount = getHeaderViewsCount();
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if (position >= headerViewsCountCount && position < headerViewsCountCount + mInnerAdapter.getItemCount()) {
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mInnerAdapter.onBindViewHolder(holder, position - headerViewsCountCount);
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} else {
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ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
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if(layoutParams instanceof StaggeredGridLayoutManager.LayoutParams) {
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((StaggeredGridLayoutManager.LayoutParams) layoutParams).setFullSpan(true);
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}
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}
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}
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@Override
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public int getItemCount() {
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return getHeaderViewsCount() + getFooterViewsCount() + mInnerAdapter.getItemCount();
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}
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@Override
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public int getItemViewType(int position) {
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int innerCount = mInnerAdapter.getItemCount();
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int headerViewsCountCount = getHeaderViewsCount();
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if (position < headerViewsCountCount) {
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return TYPE_HEADER_VIEW + position;
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} else if (headerViewsCountCount <= position && position < headerViewsCountCount + innerCount) {
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int innerItemViewType = mInnerAdapter.getItemViewType(position - headerViewsCountCount);
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if(innerItemViewType >= Integer.MAX_VALUE / 2) {
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throw new IllegalArgumentException("your adapter's return value of getViewTypeCount() must < Integer.MAX_VALUE / 2");
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}
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return innerItemViewType + Integer.MAX_VALUE / 2;
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} else {
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return TYPE_FOOTER_VIEW + position - headerViewsCountCount - innerCount;
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}
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}
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public static class ViewHolder extends RecyclerView.ViewHolder {
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public ViewHolder(View itemView) {
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super(itemView);
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}
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}
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}
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