kotlin协程库报错“Program type already present”解决

最近在学习kotlin，学习到协程库这一块了，针对Android的话就是coroutines-android库。本来学习就不容易了，再加上kotlin现在还处于快速变化期，那个酸爽简直了，废话不多说，进入正题。

kotlinx.coroutines的github地址

协程库中关于Android的文档说明

为了在Android中kotlin协程库的一些特性，我们就需要引入coroutines-android库，代码如下：
ps: 这里我使用的kotlin-gradle-plugin插件和kotlinx-coroutines-android的版本都是最新的，分别是1.2.61和0.25.0.
1、build.gradle:

// Top-level build file where you can add configuration options common to all sub-projects/modules.buildscript {    ext.kotlin_version = '1.2.61'    ext.coroutines_version = '0.25.0'    repositories {        mavenCentral()        jcenter()        google()        maven { url 'https://maven.google.com' }    }    dependencies {        classpath 'com.android.tools.build:gradle:3.1.4'        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"        // NOTE: Do not place your application dependencies here; they belong        // in the individual module build.gradle files    }}allprojects {    repositories {        mavenCentral()        jcenter()        google()    }}task clean(type: Delete) {    delete rootProject.buildDir}

2、app/build.gradle:

apply plugin: 'com.android.application'apply plugin: 'kotlin-android'apply plugin: 'kotlin-android-extensions'android {    compileSdkVersion 27    defaultConfig {        applicationId "com.example.tinytongtong.kotlincoroutineapplication"        minSdkVersion 15        targetSdkVersion 27        versionCode 1        versionName "1.0"        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"    }    buildTypes {        release {            minifyEnabled false            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'        }    }    // Configure only for each module that uses Java 8    // language features (either in its source code or    // through dependencies).    compileOptions {        sourceCompatibility JavaVersion.VERSION_1_8        targetCompatibility JavaVersion.VERSION_1_8    }}dependencies {    implementation fileTree(dir: 'libs', include: ['*.jar'])    implementation"org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"    implementation 'com.android.support:appcompat-v7:27.1.1'    implementation 'com.android.support.constraint:constraint-layout:1.1.2'    testImplementation 'junit:junit:4.12'    androidTestImplementation 'com.android.support.test:runner:1.0.2'    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"    //okhttp    api 'com.squareup.okhttp3:okhttp:3.11.0'    api 'com.squareup.okhttp3:logging-interceptor:3.4.1'}kotlin {    experimental {        coroutines "enable"    }}

2、配置好了之后，先sync再run，然后的Build窗口就会出现下面这个页面：

kotlin协程库报错“Program type already present”解决_第1张图片

问题解决：

最简单粗暴的方式就是回退版本，如下所示：

ext.kotlin_version = '1.2.61'ext.coroutines_version = '0.25.0'

接下来还是sync --> run，代码就可以跑起来了。

kotlin协程库报错“Program type already present”解决

kotlin协程库报错“Program type already present”解决

问题解决：

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