PhotoAlbum

package com.rickge.photoalbum.base; import android.content.Context; import android.os.Handler; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ProgressBar; import android.widget.TextView; import com.rickge.photoalbum.R; import java.util.ArrayList; import java.util.List; import butterknife.BindView; import butterknife.ButterKnife; /** * Created by Rick Ge on 2016/12/20. */ public abstract class BaseRecyclerAdapter<T> extends RecyclerView.Adapter { protected Context mContext; protected LayoutInflater mLayoutInflater; protected ArrayList<T> mItems; public int BEHAVIOR_MODE; public static final int NEITHER = 0; public static final int ONLY_HEADER = 1; public static final int ONLY_FOOTER = 2; public static final int BOTH_HEADER_FOOTER = 3; public static final int VIEW_TYPE_NORMAL = 0; public static final int VIEW_TYPE_HEADER = -1; public static final int VIEW_TYPE_FOOTER = -2; public static final int STATE_HIDE = 1; public static final int STATE_LOADING = 2; public static final int STATE_NO_MORE = 3; public static final int STATE_LOAD_ERROR = 4; private int mState; protected View mHeaderView; private OnLoadingHeaderListener onLoadingHeaderListener; // 暴露给外部的接口 private OnItemClickListener onItemClickListener; private OnItemLongClickListener onItemLongClickListener; // View.OnClickListener的实现类 private OnClickListener onClickListener; // View.OnLongClickListener 的实现类 private OnLongClickListener onLongClickListener; public BaseRecyclerAdapter(Context context, int mode) { this.mContext = context; mItems = new ArrayList<>(); this.mLayoutInflater = LayoutInflater.from(mContext); BEHAVIOR_MODE = mode; mState = STATE_HIDE; initListener(); } private void initListener() { onClickListener = new OnClickListener(); onLongClickListener = new OnLongClickListener(); } @Override public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { switch (viewType) { case VIEW_TYPE_HEADER: if (onLoadingHeaderListener != null) return onLoadingHeaderListener.onCreateHeaderViewHolder(parent); else throw new IllegalArgumentException("you have to impl the interface when using this viewType"); case VIEW_TYPE_FOOTER: return new FooterViewHolder(mLayoutInflater.inflate(R.layout.recycler_footer_view, parent, false)); default: final RecyclerView.ViewHolder holder = onCreateNormalViewHolder(parent, viewType); if (holder != null) { holder.itemView.setTag(holder); holder.itemView.setOnLongClickListener(onLongClickListener); holder.itemView.setOnClickListener(onClickListener); } return holder; } } @Override public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { switch (holder.getItemViewType()) { case VIEW_TYPE_HEADER: if (onLoadingHeaderListener != null) onLoadingHeaderListener.onBindHeaderViewHolder(holder, position); break; case VIEW_TYPE_FOOTER: onBindFooterViewHolder(holder); break; default: onBindNormalViewHolder(holder, mItems.get(getIndex(position)), position); break; } } protected abstract RecyclerView.ViewHolder onCreateNormalViewHolder(ViewGroup parent, int viewType); protected abstract void onBindNormalViewHolder(RecyclerView.ViewHolder holder, T item, int position); private void onBindFooterViewHolder(RecyclerView.ViewHolder holder) { FooterViewHolder fvh = (FooterViewHolder) holder; fvh.itemView.setVisibility(View.VISIBLE); switch (mState) { case STATE_LOADING: fvh.tv_footer.setText(mContext.getResources().getString(R.string.state_loading)); fvh.pb_footer.setVisibility(View.VISIBLE); break; case STATE_NO_MORE: fvh.tv_footer.setText(mContext.getResources().getString(R.string.state_no_more)); fvh.pb_footer.setVisibility(View.GONE); break; case STATE_LOAD_ERROR: fvh.tv_footer.setText(mContext.getResources().getString(R.string.state_load_error)); fvh.pb_footer.setVisibility(View.GONE); break; case STATE_HIDE: fvh.itemView.setVisibility(View.GONE); break; } } private int getIndex(int position) { return BEHAVIOR_MODE == ONLY_HEADER || BEHAVIOR_MODE == BOTH_HEADER_FOOTER ? position - 1 : position; } @Override public int getItemCount() { if (BEHAVIOR_MODE == ONLY_FOOTER || BEHAVIOR_MODE == ONLY_HEADER) { return mItems.size() + 1; } else if (BEHAVIOR_MODE == BOTH_HEADER_FOOTER) { return mItems.size() + 2; } else return mItems.size(); } @Override public int getItemViewType(int position) { if (position == 0 && (BEHAVIOR_MODE == ONLY_HEADER || BEHAVIOR_MODE == BOTH_HEADER_FOOTER)) return VIEW_TYPE_HEADER; if (position + 1 == getItemCount() && (BEHAVIOR_MODE == ONLY_FOOTER || BEHAVIOR_MODE == BOTH_HEADER_FOOTER)) return VIEW_TYPE_FOOTER; else return VIEW_TYPE_NORMAL; } public int getCount() { return mItems.size(); } public static class FooterViewHolder extends RecyclerView.ViewHolder { @BindView(R.id.pb_footer) ProgressBar pb_footer; @BindView(R.id.tv_footer) TextView tv_footer; public FooterViewHolder(View view) { super(view); ButterKnife.bind(this, view); } } public final View getHeaderView() { return this.mHeaderView; } public final void setHeaderView(View view) { this.mHeaderView = view; } public void setState(int state) { if (this.mState != state) { this.mState = state; updateItem(getItemCount() - 1); } } public void updateItem(final int position) { if (getItemCount() > position) { //notifyItemChanged(position); // Cannot call this method in a scroll callback. // Scroll callbacks might be run during a measure & layout pass where you cannot change the RecyclerView data. // Any method call that might change the structure of the RecyclerView or the adapter contents should be postponed to the next frame. Handler handler = new Handler(); Runnable r = new Runnable() { public void run() { notifyItemChanged(position); } }; handler.post(r); } } public final void resetItem(List<T> items) { if (items != null) { clear(); addAll(items); } } public void addAll(final List<T> items) { if (items != null) { int positionStart = this.mItems.size(); if(BEHAVIOR_MODE == ONLY_HEADER || BEHAVIOR_MODE == BOTH_HEADER_FOOTER){ positionStart += 1; } this.mItems.addAll(items); notifyItemRangeInserted(positionStart, items.size()); } } public final void addItem(T item) {