将数据类的数据添加到作为另一个数据类的参数的mutablelist中Kotlin Androidx

Question

这是我的第一个kotlin android项目，所以为愚蠢道歉。用户选择一个餐馆，用户决定为该特定餐馆添加一个思想，用户单击按钮，思想/usermeal被添加到所选餐馆的“餐食”arraylist中

数据类____

data class YelpSearchResult(
@SerializedName ("total") val total: Int,
@SerializedName ("businesses") val restaurants: List<YelpRestaurant>

）

val name: String,
val rating: Double,
val price: String,
@SerializedName("review_count") val numReviews: Int,
@SerializedName("image_url") val imageUrl: String,
val categories: List<YelpCategory>,
val location: YelpLocation,
val meals: MutableList<UserMeals> = ArrayList()

class ThoughtsActivity : AppCompatActivity() {

lateinit var mealName : String
lateinit var mealPrice : String
lateinit var mealThought : String
lateinit var addedMeal : UserMeals

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_thoughts)

    thoughtBtn.setOnClickListener() {

        mealName = m_name.text.toString()
        mealPrice = m_price.text.toString()
        mealThought = m_thought.text.toString()

        val addedMeal = UserMeals(mealName,mealPrice.toDouble(),mealThought)

        if(mealName.isNotEmpty()){
           addMeal()
        }

        val intent = Intent(this, RestaurantActivity::class.java)
        intent.putExtra("MEALNAME", mealName)
        intent.putExtra("PRICE", mealPrice)
        intent.putExtra("MEALTHOUGHT", mealThought)
    }
}

fun addMeal(restaurant: YelpRestaurant){
    restaurant.meals.add(addedMeal)
}

----我在中间屏幕上的活动，餐厅是传入的----

    override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_restaurant)

    val button = findViewById<Button>(R.id.addBtn)

//        rvThoughts.adapter = adapter
//        rvThoughts.layoutManager = LinearLayoutManager(this)

    button.setOnClickListener{
        val intent = Intent(this, ThoughtsActivity::class.java)
intent.putExtra("restaurantObject", <??>)
        startActivity(intent)
    }

    var intent = intent

    val aName = intent.getStringExtra("iName")
    val aRating = intent.getDoubleExtra("iRating",0.0)
    val aPrice = intent.getStringExtra("iPrice")
    val aReviews = intent.getStringExtra("iReviews")
    val aImageUrl = intent.getStringExtra("iImageUrl")
    val aCategory = intent.getStringExtra("iCategory")
    val aLocation = intent.getStringExtra("iLocation")



    r_name.text = aName
    r_reviews.text = aReviews
    r_rating.rating = aRating.toFloat()
    r_price.text = aPrice
    r_reviews.text = aReviews.toString()
    Glide.with(applicationContext).load(aImageUrl).into(r_image)
    r_category.text = aCategory
    r_address.text = aLocation


}

Answer 1

好的，我从你的问题中得到了澄清，

**更新**

添加应用程序级别分级：

apply plugin: 'kotlin-android-extensions'

@Parcelize
data class YelpRestaurant(...) : Parcelable

val intent: Intent = Intent(this, SecondActivity::class.java)
intent.putExtra("restaurant", YelpRestaurant("hey", "hello"));
startActivity(intent)

val intent: Intent = getIntent()
var yelresTaurant : YelpRestaurant = intent.getParcelableExtra("restaurant")