未解决的参考:kotlinx [英] Unresolved reference: kotlinx

问题描述

我正在尝试在 Android Studio 中试用 Kotlin 和 Kotlin Android 扩展.我已经在 Ubuntu 14.04 上的 Android Studio v 1.5.1 和 OS X El Capitan 上的 Android Studio v 1.5.1 中尝试了这个，结果相同.

I am trying to try out Kotlin and the Kotlin Android extensions in Android Studio. I have tried this both in Android Studio v 1.5.1 on Ubuntu 14.04, and in Android Studio v 1.5.1 on OS X El Capitan with the same result.

这是我在做什么:

1. 我安装了 Kotlin 插件 1.0.0-beta-35950-IJ141-11
2. 创建一个新的空白 Android 项目
3. 将 MainActivity 文件转换为 Kotlin(通过 help->findaction->convert file to kotlin)
4. 为 Kotlin 配置项目

然后我进入生成的 content_main.xml 文件并为Hello World!"添加一个 id (hello).文本视图.

I then go into the generated content_main.xml file and add an id (hello) for the "Hello World!" TextView.

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.gmail.npnster.mykotlinfirstproject.MainActivity"
    tools:showIn="@layout/activity_main">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:id="@+id/hello"
        />
</RelativeLayout>  

然后在转换后的 MainActivity 中添加一行来设置 TextView.(如下所示).Android Studio 然后提示我(通过 alt-enter)插入这一行(也如下所示)

Then in the converted MainActivity I add a line to set the TextView. (shown below). Android Studio then prompts me (via alt-enter) to insert this line (also shown below)

import kotlinx.android.synthetic.main.content_main.*

所以在这一点上，一切看起来都很好

So at this point everything seems fine

但是当我尝试编译它时，我得到

but then when I try to compile this I get

Unresolved reference: kotlinx
Unresolved reference: kotlinx
Unresolved reference: hello

请注意，我没有安装了 Kotlin Android 扩展插件.几天前，它现在应该包含在主插件中并被标记为过时.(实际上，如果您在拥有最新插件的情况下尝试安装它，则不会安装任何新内容)

Notice that I did not install the Kotlin Android extensions plugin. As of a couple of days ago this is now supposed to be included in the main plug in and is marked as obsolete. (In fact if you try to install it when you have the latest plugin, nothing new is installed)

有人看到我做错了什么吗?

Anyone see what I am doing wrong?

主活动

import android.os.Bundle
import android.support.design.widget.FloatingActionButton
import android.support.design.widget.Snackbar
import android.support.v7.app.AppCompatActivity
import android.support.v7.widget.Toolbar
import android.view.View
import android.view.Menu
import android.view.MenuItem
import kotlinx.android.synthetic.main.content_main.*


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val toolbar = findViewById(R.id.toolbar) as Toolbar
        setSupportActionBar(toolbar)
        print("setting text view value to hey")
        hello.text = "hey"

        val fab = findViewById(R.id.fab) as FloatingActionButton
        fab.setOnClickListener { view -> Snackbar.make(view, "Replace this with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show() }
    }

    override fun onCreateOptionsMenu(menu: Menu): Boolean {
        // Inflate the menu; this adds items to the action bar if it is present.
        menuInflater.inflate(R.menu.menu_main, menu)
        return true
    }

    override fun onOptionsItemSelected(item: MenuItem): Boolean {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        val id = item.itemId

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true
        }

        return super.onOptionsItemSelected(item)
    }
}

推荐答案

在我们的 buildscript 的依赖项中添加 kotlin-android-extensions:

Add kotlin-android-extensions in our buildscript's dependencies:

1.在你的项目级 build.gradle

buildscript {
    dependencies {
        classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
    }
}

并应用 kotlin-android-extensions 插件:

2.在你的模块级 build.gradle

apply plugin: 'kotlin-android-extensions'

这篇关于未解决的参考:kotlinx的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！