仿微信图片上传，带加号，且超过最大数隐藏

1、仿照微信空间上传图片，显示图片数量以及超过最大，上传按钮隐藏功能

2、上效果图

3、上代码，主要是Adapter类

/**
* Created by zhangyinlei on 2018/3/2 0002.
*/
public class AlbumSelectedShowAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static int TYPE_ADD = 0;//添加微信小程序图片
private static int TYPE_COMMON = 1;//普通图片展示

private Context context;
private LayoutInflater mLayoutInflater;

//data
private int mMaxAlbum;//最大选择图片的数量
private List<String> mStringList;//图片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;
ViewGroup.LayoutParams layoutParams = holder.itemView.getLayoutParams();
layoutParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
layoutParams.height = ViewGroup.LayoutParams.WRAP_CONTENT;
if (holder instanceof ItemViewHolderAdd) {
ItemViewHolderAdd itemViewHolderAdd = (ItemViewHolderAdd) holder;
if (position >= mMaxAlbum) {
layoutParams.width = 0;
layoutParams.height = 0; 
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;//加一代表最后一个添加图片按钮
}

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);
}

}

在Activity中使用，recycleView

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) {
//选择相册功能
AlbumUtils.choosePicture(SuggestionActivity.this, false, mMaxAlbum - mStringList.size(), true);
} else {
//图片展示界面
}
}
});
}