RecyclerView的多種item顯示簡記

1. 引入庫

       //代碼簡化
       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'

    

2. 重寫方法

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

    

3. 幾種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);
               }
           }

    

4. 創建多種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);
               }
           }