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我想在我的基于 Maven 的项目中使用Kotlin Android 扩展,但是尽管添加kotlin-android-extensions到我的 Maven 插件集中,它只是不需要。

我的,我认为相当少,设置如下:

.
├── AndroidManifest.xml
├── pom.xml
├── res
│   └── layout
│       └── main_activity.xml
└── src
    └── activity.kt

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.KotlinAndroid"
          android:versionCode="1"
          android:versionName="0.1-SNAPSHOT">
  <uses-sdk
      android:minSdkVersion="14"
      android:targetSdkVersion="19" />  
  <application android:label="Hello Kotlin">    
    <activity android:name=".activity.MainActivity">
      <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
      </intent-filter>
    </activity>   
  </application>
</manifest>

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>com.example.KotlinAndroid</groupId>
  <artifactId>hello-kotlin</artifactId>
  <packaging>apk</packaging>
  <name>hello-kotlin</name>
  <version>0.1-SNAPSHOT</version>

  <dependencies>    
    <dependency>
      <groupId>com.google.android</groupId>
      <artifactId>android</artifactId>
      <version>4.1.1.4</version>
      <scope>provided</scope>
    </dependency>   
    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib</artifactId>
      <version>1.0.0</version>
    </dependency>    
  </dependencies>

  <build>
    <plugins>
      <plugin>
        <groupId>com.jayway.maven.plugins.android.generation2</groupId>
        <artifactId>android-maven-plugin</artifactId>
        <version>3.8.2</version>
        <configuration>
          <sdk>
            <platform>19</platform>
          </sdk>
          <undeployBeforeDeploy>true</undeployBeforeDeploy>
        </configuration>
        <extensions>true</extensions>
      </plugin>      
      <plugin>
        <artifactId>kotlin-maven-plugin</artifactId>
        <groupId>org.jetbrains.kotlin</groupId>
        <version>1.0.0</version>
        <executions>
          <execution>
            <id>compile</id>
            <phase>process-sources</phase>
            <goals>
              <goal>compile</goal>
            </goals>
          </execution>         
          <execution>
            <id>test-compile</id>
            <phase>process-test-sources</phase>
            <goals>
              <goal>test-compile</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-android</artifactId>
        <version>1.0.0</version>
      </plugin>
      <plugin>
        <groupId>org.jetbrains.kotlin</groupId>
        <artifactId>kotlin-android-extensions</artifactId>
        <version>1.0.0</version>
      </plugin>
      <!-- I needed to add this plugin otherwise my Kotlin source
           files are not found -->
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <version>1.10</version>
        <artifactId>build-helper-maven-plugin</artifactId>
        <executions>
          <execution>
            <phase>generate-sources</phase>
            <goals><goal>add-source</goal></goals>
            <configuration>
              <sources>
                <source>src</source>
              </sources>
            </configuration>
          </execution>
        </executions>
      </plugin>      
    </plugins>
  </build>  
</project>

res/layout/main_activity.xml

<?xml version="1.0" encoding="utf-8"?>    
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

  <TextView
      android:layout_height="wrap_content"
      android:layout_width="match_parent"
      android:text="Hello World!"
      android:id="@+id/textView" />
</LinearLayout>

src/activity.kt

package com.example.KotlinAndroid.activity

import android.os.Bundle
import android.app.Activity
import com.example.KotlinAndroid.R

class MainActivity() : Activity() {

    protected override fun onCreate(savedInstanceState : Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.main_activity)
    }
}

所以这一切都有效,直到我更改activity.kt为 importkotlinx.android.synthetic.main.main_activity.*而不是import com.example.KotlinAndroid.R,然后失败

  • [错误] hello-kotlin/src/activity.kt:(6、8)未解决的参考:kotlinx

  • [错误] hello-kotlin/src/activity.kt:(12、24)未解决的参考:R

我发现这个问题的所有解决方案都只适用于 Gradle 构建,在这种情况下,显然添加kotlin-android-extensions插件就足够了。kotlin-android-extensions但是,在我的仅 Maven 构建中,我的插件列表中已经有了(请参阅pom.xml文件);然而 Kotlin 并没有生成所需的kotlinx.*类。

4

1 回答 1

1

kotlin-android-extensions 现在是 kotlin-gradle 插件的一部分。kotlin-maven 插件现在根本不支持 android。您可以投票支持您的跟踪器中的一个问题

于 2016-03-06T03:45:03.080 回答