json - 有一种干净的DRY方法可以从HTTP请求JSON更新多个textViews吗？

Question

我有以下Kotlin / Anko / Android Activity 。

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import android.widget.TextView
import com.fasterxml.jackson.module.kotlin.readValue
import com.github.kittinunf.fuel.Fuel
import eu.gwapi.laaketilaus.util.JSON
import eu.gwapi.laaketilaus.util.Order
import org.jetbrains.anko.find
import org.jetbrains.anko.textView
import org.jetbrains.anko.toast
import org.jetbrains.anko.verticalLayout

class OrderDetailsActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        val order_id: Long = intent.extras.getLong("order_id")
        verticalLayout {
            textView {
                id = R.id.order_detail_customer
            }
            textView {
                id = R.id.order_detail_address
            }
            textView {
                id = R.id.order_detail_postal_code
            }
            textView {
                id = R.id.order_detail_phone
            }
        }
        getOrder(order_id)
    }

    fun getOrder(order_id: Long) {
        Fuel.get("https://my.api.endpoint/" + order_id.toString()).responseString { request, response, result ->
            val (json, err) = result
            if (err != null) {
                toast(err.toString())
            } else {
                val order: Order = JSON.readValue(json!!)
                find<TextView>(R.id.order_detail_customer).text = order.customer
                find<TextView>(R.id.order_detail_address).text = order.address
                find<TextView>(R.id.order_detail_postal_code).text = order.postal_code
                find<TextView>(R.id.order_detail_phone).text = order.phone
            }
        }
    }
}

对于像我这样顽固的pythonista来说，这似乎是完全静态且冗长的方式。

有没有更好的办法？

Answer 1

由于只有TextView，并且您只需要更改其文本，因此可以通过以下方式简化代码:

为存储ID的Order属性添加映射:

private val orderPropertyToTextViewId = mapOf(
        Order::customer to R.id.order_detail_customer,
        Order::address to R.id.order_detail_address,
        Order::postalCode to R.id.order_detail_postal_code,
        Order::phone to R.id.order_detail_phone
)

创建遍历 map 的 View :

verticalLayout {
    for ((property, textViewId) in orderPropertyToTextViewId) {
        textView { id = textViewId }
    }
}

更新在 map 上迭代的文本:

for ((property, textViewId) in orderPropertyToTextViewId) {
    findViewById<TextView>(textViewId).text = property.get(order)
}

如果您存储 findViewById<TextView>(...)调用返回的 TextView而不是 map 中的ID，则可以走得更远，摆脱ID和 textView { ... }，但这需要进一步试验。