package com.lcjian.lib.recyclerview;
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import android.view.View;
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import android.view.ViewGroup;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.GridLayoutManager;
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import androidx.recyclerview.widget.RecyclerView;
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import androidx.recyclerview.widget.StaggeredGridLayoutManager;
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import java.util.List;
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public class EmptyAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
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private RecyclerView.Adapter<? extends RecyclerView.ViewHolder> mInnerAdapter;
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private View mEmptyView;
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private int mEmptyViewType;
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private boolean mPreEmpty = true;
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private final RecyclerView.AdapterDataObserver dataObserver = new RecyclerView.AdapterDataObserver() {
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@Override
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public void onChanged() {
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notifyDataSetChanged();
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mPreEmpty = mInnerAdapter.getItemCount() == 0;
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}
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@Override
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public void onItemRangeChanged(int positionStart, int itemCount) {
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boolean empty = mInnerAdapter.getItemCount() == 0;
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if (mPreEmpty || empty) {
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notifyDataSetChanged();
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} else {
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notifyItemRangeChanged(positionStart, itemCount);
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}
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mPreEmpty = empty;
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}
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@Override
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public void onItemRangeChanged(int positionStart, int itemCount, Object payload) {
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boolean empty = mInnerAdapter.getItemCount() == 0;
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if (mPreEmpty || empty) {
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notifyDataSetChanged();
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} else {
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notifyItemRangeChanged(positionStart, itemCount, payload);
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}
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mPreEmpty = empty;
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}
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@Override
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public void onItemRangeInserted(int positionStart, int itemCount) {
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boolean empty = mInnerAdapter.getItemCount() == 0;
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if (mPreEmpty || empty) {
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notifyDataSetChanged();
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} else {
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notifyItemRangeInserted(positionStart, itemCount);
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}
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mPreEmpty = empty;
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}
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@Override
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public void onItemRangeRemoved(int positionStart, int itemCount) {
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boolean empty = mInnerAdapter.getItemCount() == 0;
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if (mPreEmpty || empty) {
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notifyDataSetChanged();
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} else {
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notifyItemRangeRemoved(positionStart, itemCount);
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}
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mPreEmpty = empty;
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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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boolean empty = mInnerAdapter.getItemCount() == 0;
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if (mPreEmpty || empty) {
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notifyDataSetChanged();
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} else {
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notifyItemRangeChanged(fromPosition, toPosition + itemCount);
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}
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mPreEmpty = empty;
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}
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};
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public EmptyAdapter(RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter) {
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setInnerAdapter(adapter);
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}
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public EmptyAdapter setEmptyView(View emptyView) {
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mEmptyView = emptyView;
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mEmptyViewType = mEmptyView.hashCode();
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return this;
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}
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public void showEmptyView() {
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if (mEmptyView != null) {
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mEmptyView.setVisibility(View.VISIBLE);
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}
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}
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public void hideEmptyView() {
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if (mEmptyView != null) {
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mEmptyView.setVisibility(View.INVISIBLE);
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}
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}
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public void setInnerAdapter(RecyclerView.Adapter<? extends RecyclerView.ViewHolder> adapter) {
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if (mInnerAdapter != null) {
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mInnerAdapter.unregisterAdapterDataObserver(dataObserver);
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}
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this.mInnerAdapter = adapter;
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mInnerAdapter.registerAdapterDataObserver(dataObserver);
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}
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@Override
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public int getItemCount() {
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if (mInnerAdapter.getItemCount() == 0 && mEmptyView != null) {
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return 1;
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} else {
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return mInnerAdapter.getItemCount();
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}
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}
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@Override
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public long getItemId(int position) {
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if (mInnerAdapter.getItemCount() == 0 && mEmptyView != null) {
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return mEmptyViewType;
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}
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return mInnerAdapter.getItemId(position);
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}
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@Override
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public int getItemViewType(int position) {
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if (mInnerAdapter.getItemCount() == 0 && mEmptyView != null) {
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return mEmptyViewType;
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}
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return mInnerAdapter.getItemViewType(position);
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}
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@NonNull
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@Override
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public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
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if (viewType == mEmptyViewType) {
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return new EmptyHolder(mEmptyView);
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}
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return mInnerAdapter.onCreateViewHolder(parent, viewType);
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}
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@Override
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@SuppressWarnings("unchecked")
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public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position) {
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if (holder instanceof EmptyHolder) {
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return;
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}
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((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onBindViewHolder(holder, position);
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}
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@Override
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@SuppressWarnings("unchecked")
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public void onBindViewHolder(@NonNull RecyclerView.ViewHolder holder, int position, @NonNull List<Object> payloads) {
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if (holder instanceof EmptyHolder) {
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return;
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}
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((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onBindViewHolder(holder, position, payloads);
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}
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@Override
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public void onAttachedToRecyclerView(@NonNull RecyclerView recyclerView) {
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mInnerAdapter.onAttachedToRecyclerView(recyclerView);
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RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
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if (layoutManager instanceof GridLayoutManager) {
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final GridLayoutManager gridLayoutManager = (GridLayoutManager) layoutManager;
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final GridLayoutManager.SpanSizeLookup spanSizeLookup = gridLayoutManager.getSpanSizeLookup();
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gridLayoutManager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {
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@Override
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public int getSpanSize(int position) {
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if (mInnerAdapter.getItemCount() == 0 && mEmptyView != null) {
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return gridLayoutManager.getSpanCount();
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}
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if (spanSizeLookup != null) {
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return spanSizeLookup.getSpanSize(position);
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}
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return 1;
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}
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});
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gridLayoutManager.setSpanCount(gridLayoutManager.getSpanCount());
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}
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}
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@Override
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@SuppressWarnings("unchecked")
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public void onViewAttachedToWindow(@NonNull RecyclerView.ViewHolder holder) {
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if (holder instanceof EmptyHolder) {
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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 p = (StaggeredGridLayoutManager.LayoutParams) layoutParams;
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p.setFullSpan(true);
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}
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} else {
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((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onViewAttachedToWindow(holder);
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}
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}
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@Override
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@SuppressWarnings("unchecked")
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public boolean onFailedToRecycleView(@NonNull RecyclerView.ViewHolder holder) {
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if (holder instanceof EmptyHolder) {
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return super.onFailedToRecycleView(holder);
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} else {
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return ((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onFailedToRecycleView(holder);
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}
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}
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@Override
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public void onDetachedFromRecyclerView(@NonNull RecyclerView recyclerView) {
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mInnerAdapter.onDetachedFromRecyclerView(recyclerView);
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}
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@Override
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@SuppressWarnings("unchecked")
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public void onViewDetachedFromWindow(@NonNull RecyclerView.ViewHolder holder) {
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if (holder instanceof EmptyHolder) {
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super.onViewDetachedFromWindow(holder);
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} else {
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((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onViewDetachedFromWindow(holder);
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}
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}
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@Override
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@SuppressWarnings("unchecked")
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public void onViewRecycled(@NonNull RecyclerView.ViewHolder holder) {
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if (holder instanceof EmptyHolder) {
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super.onViewRecycled(holder);
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} else {
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((RecyclerView.Adapter<RecyclerView.ViewHolder>) mInnerAdapter).onViewRecycled(holder);
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}
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}
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private static class EmptyHolder extends RecyclerView.ViewHolder {
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private EmptyHolder(View itemView) {
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super(itemView);
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}
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}
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}
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