/** * Created by zhangyinlei on 2018/3/2 0002. */public class AlbumSelectedShowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {  private static int TYPE_ADD = 0;//添加圖片  private static int TYPE_COMMON = 1;//普通圖片展示  private Context context;  private LayoutInflater mLayoutInflater;  //data  private int mMaxAlbum;//最大選擇圖片的數量  private List<String> mStringList;//圖片url集合  public AlbumSelectedShowAdapter(Context context, List<String> mStringList, int maxAlbum) {    this.context = context;    this.mStringList = mStringList;    this.mMaxAlbum = maxAlbum;    this.mLayoutInflater = LayoutInflater.from(context);  }  @Override  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {    if (viewType == TYPE_ADD) {      return new ItemViewHolderAdd(mLayoutInflater.inflate(R.layout.item_album_selected_add, parent, false));    } else {      return new ItemViewHolderCommon(mLayoutInflater.inflate(R.layout.item_album_selected_common, parent, false));    }  }  @Override  public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {    View itemView = null;    if (holder instanceof ItemViewHolderAdd) {      ItemViewHolderAdd itemViewHolderAdd = (ItemViewHolderAdd) holder;      if (position >= mMaxAlbum) {        itemViewHolderAdd.itemView.setVisibility(View.GONE);      } else {        itemViewHolderAdd.tvNum.setText(position + "/" + mMaxAlbum);        itemViewHolderAdd.itemView.setVisibility(View.VISIBLE);        itemView = ((ItemViewHolderAdd) holder).itemView;      }    } else if (holder instanceof ItemViewHolderCommon) {      String url = mStringList.get(position);      Glide.with(context).load(url).apply(RequestOptions.centerCropTransform()).transition(withCrossFade()).into(((ItemViewHolderCommon) holder).ivCommon);      itemView = ((ItemViewHolderCommon) holder).itemView;    }    if (mOnItemClickListener != null && null != itemView) {      itemView.setOnClickListener(new View.OnClickListener() {        @Override        public void onClick(View v) {          int position = holder.getLayoutPosition();          mOnItemClickListener.onItemClick(holder.itemView, position);        }      });    }  }  @Override  public int getItemViewType(int position) {    return position == mStringList.size() ? TYPE_ADD : TYPE_COMMON;  }  @Override  public int getItemCount() {    return mStringList.size() + 1;//加一代表最后一個添加圖片按鈕  }  public static class ItemViewHolderAdd extends RecyclerView.ViewHolder {    private TextView tvNum;    public ItemViewHolderAdd(View itemView) {      super(itemView);      tvNum = itemView.findViewById(R.id.tv_album_selected_num);    }  }  public static class ItemViewHolderCommon extends RecyclerView.ViewHolder {    private ImageView ivCommon;    public ItemViewHolderCommon(View itemView) {      super(itemView);      ivCommon = itemView.findViewById(R.id.iv_album_selected);    }  }  private OnItemClickListener mOnItemClickListener;  public void setOnItemClickListener(OnItemClickListener onItemClickListener) {    mOnItemClickListener = onItemClickListener;  }  public interface OnItemClickListener {    void onItemClick(View view, int position);  }}

mStringList = new ArrayList<>();    mAlbumSelectedShowAdapter = new AlbumSelectedShowAdapter(this, mStringList, mMaxAlbum);    mRvAlbumSelected.setLayoutManager(new GridLayoutManager(this, 4));    mRvAlbumSelected.setHasFixedSize(true);    mRvAlbumSelected.setAdapter(mAlbumSelectedShowAdapter);    mAlbumSelectedShowAdapter.setOnItemClickListener(new AlbumSelectedShowAdapter.OnItemClickListener() {      @Override      public void onItemClick(View view, int position) {        if (mStringList.size() == position) {        //選擇相冊功能          AlbumUtils.choosePicture(SuggestionActivity.this, false, mMaxAlbum - mStringList.size(), true);        } else {          //圖片展示界面        }      }    });  }