无法在Anko中预览

Question

我有这个问题：

​

错误：

C:\Users\avi12\OneDrive\Documents\AndroidApps\WhatsApp Easy Sticker Maker\app\src\main\java\com\avi12\whatsappeasystickermaker\MainActivity.kt: (20, 13): Overload resolution ambiguity:
public inline fun ViewManager.textView(init: (@AnkoViewDslMarker TextView).() -> Unit): TextView defined in org.jetbrains.anko
public inline fun ViewManager.textView(init: (@AnkoViewDslMarker TextView).() -> Unit): TextView defined in org.jetbrains.anko

我的代码，因为我刚刚开始发现Anko：

package com.avi12.whatsappeasystickermaker

import android.os.Bundle
import android.support.v7.app.AppCompatActivity
import org.jetbrains.anko.design.*
import org.jetbrains.anko.*

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        coordinatorLayout {
            textView {
                text = "Begin by tapping the + button"
            }
            floatingActionButton {

            }
        }
    }
}

Anko版本：0.10.8

Android Studio版本：3.3

Answer 1

问题似乎是，在build.gradle中，我有：

dependencies {
    ...
    implementation "org.jetbrains.anko:anko-sdk25:$anko_version" // sdk15, sdk19, sdk21, sdk23 are also available
    implementation "org.jetbrains.anko:anko-appcompat-v7:$anko_version"
}

出于某些原因，这在一定程度上解决了问题(就成功构建而言，仍然没有预览)：

dependencies {
    ...
    // implementation "org.jetbrains.anko:anko-sdk25:$anko_version" // sdk15, sdk19, sdk21, sdk23 are also available
    implementation "org.jetbrains.anko:anko-appcompat-v7:$anko_version"
}

Answer 2

只有当我们在实现AnkoComponent接口的外部类中定义布局时，...preview才有效。下面是我们将如何修改我们的活动，以便在一个单独的类中定义我们的视图：

class MainActivity : AppCompatActivity() {

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    MainActivityUI().setContentView(this)
}

class MainActivityUI : AnkoComponent<MainActivity> {
    override fun createView(ui: AnkoContext<MainActivity>) = with(ui) {
        verticalLayout {
            gravity = Gravity.CENTER
            padding = dip(20)

            textView {
                gravity = Gravity.CENTER
                text = "Enter your request"
                textColor = Color.BLACK
                textSize = 24f
            }.lparams(width = matchParent) {
                margin = dip(20)
            }

            val name = editText {
                hint = "What is your name?"
            }

            editText {
                hint = "What is your message?"
                lines = 3
            }

            button("Enter") {
                onClick {
                    toast( "Hey ${name.text}! Thank you for contacting us. We will get in touch with you soon.")
                }
            }.lparams(dip(280), sp(80))

        }
    }
}

}

我希望它能解决这个问题，我很快就会知道...