错误：无法解析配置"：classpath"的所有工件。无法解析外部依赖项 X，因为未定义存储库

Question

我想在我的项目中添加dagger柄依赖，但编译器显示此消息。

这是错误信息

Could not resolve all artifacts for configuration ':classpath'.
> Cannot resolve external dependency com.google.dagger:hilt-android-gradle-plugin:2.38.1 because no repositories are defined.
Required by:
project :
Possible solution:
- Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html

构建。gradle (projectname)

buildscript {
dependencies {
classpath 'com.google.dagger:hilt-android-gradle-plugin:2.38.1'
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

build.gradle:应用程序

plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'kotlin-kapt'
id 'dagger.hilt.android.plugin'
}
android {
compileSdk 31
defaultConfig {
applicationId "com.example.paginationjetpackcompose"
minSdk 21
targetSdk 31
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard- 
rules.pro'
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.8.0'
implementation 'androidx.appcompat:appcompat:1.4.2'
implementation 'com.google.android.material:material:1.4.0'
implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
implementation 'com.google.dagger:hilt-android:2.28.3-alpha'
kapt 'com.google.dagger:hilt-android-compiler:2.28.3-alpha'
implementation "androidx.hilt:hilt-lifecycle-viewmodel:1.0.0-alpha02"
kapt "androidx.hilt:hilt-compiler:1.0.0-alpha02"

def paging_version = "3.0.0-alpha02"
implementation "androidx.paging:paging-runtime-ktx:$paging_version"
implementation 'com.squareup.retrofit2:converter-gson:2.9.0'
implementation 'com.squareup.retrofit2:retrofit:2.9.0' 
}

Answer 1

当你在较新版本的Android Studio中创建一个项目时，构建结构与我们仍然在文档中找到的略有不同…

您的构建。Gradle from project将是这样的:

buildscript {
ext {
kotlin_ver = '1.7.10'
}
}
plugins {
id 'com.android.application' version '7.2.1' apply false
id 'com.android.library' version '7.2.1' apply false
id 'org.jetbrains.kotlin.android' version "$kotlin_ver" apply false
}
task clean(type: Delete) {
delete rootProject.buildDir
}

你仍然可以在buildscript中为插件类路径添加一个依赖块:

buildscript {
ext {
kotlin_ver = '1.7.10'
hilt_ver = '2.43.1'
}
dependencies {
classpath "com.google.dagger:hilt-android-gradle-plugin:$hilt_ver"
}
}
plugins {
id 'com.android.application' version '7.2.1' apply false
id 'com.android.library' version '7.2.1' apply false
id 'org.jetbrains.kotlin.android' version "$kotlin_ver" apply false
id 'org.jetbrains.kotlin.kapt' version "$kotlin_ver" apply false
}
// ...

或者使用更新的插件方式，如果你想使用的库已经支持这种新格式，像这样:

buildscript {
ext {
kotlin_ver = '1.7.10'
hilt_ver = '2.43.1'
}
}
plugins {
id 'com.android.application' version '7.2.1' apply false
id 'com.android.library' version '7.2.1' apply false
id 'org.jetbrains.kotlin.android' version "$kotlin_ver" apply false
id 'org.jetbrains.kotlin.kapt' version "$kotlin_ver" apply false
id 'com.google.dagger.hilt.android' version "$hilt_ver" apply false
}

在构建。Gradle from app module将和我们以前使用的一样:

plugins {
id 'com.android.application'
id 'org.jetbrains.kotlin.android'
id 'org.jetbrains.kotlin.kapt'
id 'com.google.dagger.hilt.android'
}
android {
// ...
}
dependencies {
// ...

implementation "com.google.dagger:hilt-android:$hilt_ver"
kapt "com.google.dagger:hilt-android-compiler:$hilt_ver"
}

Answer 2

你没有告诉gradle从哪里获取插件。要实现这一点，只需替换您的项目构建。Gradle by this:

buildscript {
// I only added this part indicating to gradle to go to mavenCentral to fetch plugins
repositories {
mavenCentral()
}
dependencies {
classpath 'com.google.dagger:hilt-android-gradle-plugin:2.38.1'
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}

要了解更多信息，请随意阅读Gradle文档并查看Maven中央仓库以获取更多信息