函数：布局函数，层级函数

布局：

• modifier继承，复用；
• 占据空间
• 布局对齐

资源：在 Resource Manager 中添加，一般以Modlue 分类；新建Data类进行管理

For list items that have multiple pieces of data, like an image and text, you will need a class that contains all of these properties. Data classes are a type of class that only contain properties, they can provide some utility methods to work with those properties.

Name the new package model. The model package will contain the data model that will be represented by a data class. The data class will be comprised of properties that represent the information relevant to what will be an "Affirmation," which will consist of a string resource and an image resource. Packages are directories that contain classes and even other directories

package com.kotlin.whatiskotlin.model

import androidx.annotation.DrawableRes
import androidx.annotation.StringRes

data class Affirmation(
    @StringRes val stringResourceId: Int,
    @DrawableRes val imageResourceId: Int
)

• 添加mip map：通过Image Asset 添加*.xml 自动生成不同尺寸下的图像。