RecyclerView的多种item显示简记

原创于 2019-04-24 10:50:14 发布 · 273 阅读

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#recyclerview #多种item

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本文详细介绍了在Android应用中使用RecyclerView结合ButterKnife实现多类型ViewHolder的完整过程，包括依赖库的引入、ViewHolder的创建及重写getItemViewType与onCreateViewHolder方法。

引入库

    //代码简化
    annotationProcessor 'com.jakewharton:butterknife-compiler:8.8.1'
    implementation 'com.jakewharton:butterknife:8.8.1'
    //recyclerView
    implementation 'com.android.support:recyclerview-v7:28.0.0'

重写方法

 @Override
        public int getItemViewType(int position) {
            if (position == 0) {
                return 0;
            } else if (position == 1 || position == 3) {
                return 1;
            } else {
                return 2;
            }
        }

几种Viewholder

class Item3ViewHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.iv5)
            ImageView iv5;
            public Item3ViewHolder(@NonNull View itemView) {
                super(itemView);
                ButterKnife.bind(this, itemView);
            }
        }

        class Item2ViewHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.iv4)
            ImageView iv4;
            @BindView(R.id.iv3)
            ImageView iv3;
            @BindView(R.id.iv2)
            ImageView iv2;
            public Item2ViewHolder(@NonNull View itemView) {
                super(itemView);
                ButterKnife.bind(this, itemView);
            }
        }

        class Item1ViewHolder extends RecyclerView.ViewHolder{
            @BindView(R.id.iv1)
            ImageView iv1;
            @BindView(R.id.tv1)
            TextView tv1;
            @BindView(R.id.tv2)
            TextView tv2;
            public Item1ViewHolder(@NonNull View itemView) {
                super(itemView);
                ButterKnife.bind(this, itemView);
            }
        }

创建多种ViewHolder

@NonNull
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
            if (i == 0) {
                View v  = LayoutInflater.from(mContext).inflate(R.layout.item3, viewGroup, false);
                return new Item3ViewHolder(v);
            } else if (i == 1) {
                View view = LayoutInflater.from(mContext).inflate(R.layout.item2, viewGroup, false);
                return new Item2ViewHolder(view);
            } else {
                View view = LayoutInflater.from(mContext).inflate(R.layout.item1, viewGroup, false);
                return new Item1ViewHolder(view);
            }
        }