两种方式实现RecyclerView多布局

方式一如图:

 

 

具体思路步骤:

1. 子项有3种类型, 分别是TextView+EditView, TextView+RadioGroup, TextView+imageView. 且除第1、2项外还有点击事件
2. 新建3个item.xml供不同种子项使用
3. createHolder时判断子项类型而调用不同的item.xml

 

代码实现: 

1. 首先创建Item实体并加入自定义属性

   public class ItemEntity {
   	public String title;
   	public int type; //1代表子项1, 2代表子项2, 3代表子项剩余其他
   }

2. Activity中添加数据

   List itemList = new ArrayList<>();
   
   ItemEntity i0 = new ItemArrange();
   i0.title = "方案名称";
   i0.type = 0;
   itemList.add(i0);
   
   ItemEntity i1 = new ItemArrange();
   i1.title = "性别";
   i1.type = 1;
   itemList.add(i1);
   
   ...

3. ItemAdapter

   public class ItemAdapter extends RecyclerView.Adapter{
       private List itemList = new ArrayList<>();
       public ItemAdapter(List mItemList) {
           itemList = mItemList;
       }
   
       @Override
       public ItemAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
           ItemAdapter.ViewHolder holder = null;
           switch (viewType){
               case 1:
                   holder = new ItemAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_1, parent, false));
                   break;
               case 2:
                   holder = new ItemAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_2, parent, false));
                   break;
               case 3:
                   holder = new ItemAdapter.ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_3, parent, false));
                   break;
               }
           return holder;
       }
   
       @Override
       public void onBindViewHolder(final ViewHolder holder, final int position) {
           final ItemEntity item = itemList.get(position);
           holder.tvTitle.setText(itemList.get(position).title);
           holder.itemView.setOnClickListener(new View.OnClickListener() {
           
           @Override
           public void onClick(View v) {
               ... 
               //除了第一、二项外，其他项需要点击事件，可以ItemEntity再加个属性进行判断
           }
       }
   
       @Override
       public int getItemViewType(int position) {
           //在第一次createHolder时会调用
           return itemList.get(position).type;
       }
   
   
       ...
   
   }

 

方式二如图: 

方式一适用于子项部件差异不大的情况, 代码比较简略

如果出现的组件种类过多, 不适合创建一个实例将所有种类写进去. 则可以用方式二

static List itemList;
public void initList(){
    itemList = new ArrayList<>();
    item i1 = new item(R.drawable.ic_reminder,"声音与提醒");
    itemList.add(i1);
    item i2 = new item(R.drawable.ic_help,"帮助");
    itemList.add(i2);
    item i3 = new item(R.drawable.ic_info,"关于");
    itemList.add(i3);
}
class item{
    int itemIconId;
    String itemText;
    public item(int itemIconId,String itemText){
        this.itemIconId = itemIconId;
        this.itemText = itemText;
    }
}


class itemAdapter extends RecyclerView.Adapter{
    //总共有3种类型布局，登录、间隔、设置项
    final static int AVATAR = 0;
    final static int SETTING = 1;
    final static int INTERVAL = 2;

    public itemAdapter(){ }
    @NonNull
    @Override
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int viewType) {
        switch(viewType){
            case AVATAR:
                View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_avatar, viewGroup, false);
                return new avatarHolder(view);
            case INTERVAL:
                View view1 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_interval, viewGroup, false);
                return new intervalHolder(view1);
            default:
                View view2 = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_setting, viewGroup, false);
                return new settingHolder(view2);
        }
    }
    @Override
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int position) {
        //因为头像布局和间隔布局是固定格式的，所以只需要给每个设置项绑定就可以了
        if(viewHolder instanceof settingHolder) setSettingHolder((settingHolder)viewHolder,position);
    }
    @Override
    public int getItemCount() {
        //设置项的个数 + 3（1个登录项 + 2个间隔项）
        return itemList.size() + 3;
    }
    @Override
    public int getItemViewType(int position) {
        switch (position){
            case 0: return AVATAR;
            case 1:
            case 3: return INTERVAL;
            default:return SETTING;
        }
    }
    class avatarHolder extends RecyclerView.ViewHolder{
        public avatarHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
    class intervalHolder extends RecyclerView.ViewHolder{
        public intervalHolder(@NonNull View itemView) {
            super(itemView);
        }
    }
    class settingHolder extends RecyclerView.ViewHolder{
        ImageView imageView;
        TextView textView;
        public settingHolder(@NonNull View itemView) {
            super(itemView);
            imageView = itemView.findViewById(R.id.imageview);
            textView = itemView.findViewById(R.id.textView);
        }
    }
    public void setSettingHolder(settingHolder viewHolder, int position){
        switch (position){
            //注意每个设置项在RV和在itemList中的position是不一定相同的
            case 2:
                viewHolder.imageView.setImageResource(itemList.get(0).itemIconId);
                viewHolder.textView.setText(itemList.get(0).itemText);
                break;
            case 4:
                viewHolder.imageView.setImageResource(itemList.get(1).itemIconId);
                viewHolder.textView.setText(itemList.get(1).itemText);
                break;
            case 5:
                viewHolder.imageView.setImageResource(itemList.get(2).itemIconId);
                viewHolder.textView.setText(itemList.get(2).itemText);
                break;
        }
        //viewHolder.itemView.setOnClickListener(new View.OnClickListener() {...}
    }
}