"Could not resolve all dependencies"与第三方库(来自Maven Central)

Question

在我的build.gradle中，我定义了一些第三方库，所有这些库都在Maven Central中可用。

dependencies {    
compile 'com.google.code.gson:gson:2.2.4'
compile 'com.google.guava:guava:15.0'
compile 'com.netflix.rxjava:rxjava-core:0.14.2'
compile 'com.netflix.rxjava:rxjava-android:0.14.2'
}

(我们在libs下也有手动管理的jar(用于Eclipse用户)，我过去常常使用对于Gradle构建，也使用compile fileTree(dir: 'libs', include: '*.jar')，但我正试图从这一点转向更简单、自动化的依赖关系管理。)

无论如何，由于某种原因，提取deps失败：

* What went wrong:
A problem occurred configuring root project 'MyApp-Android'.
> Could not resolve all dependencies for configuration ':_debugCompile'.
> Could not find com.google.code.gson:gson:2.2.4.
Required by:
:MyApp-Android:unspecified
> Could not find com.google.guava:guava:15.0.
Required by:
:MyApp-Android:unspecified
> Could not find com.netflix.rxjava:rxjava-core:0.14.2.
Required by:
:MyApp-Android:unspecified
> Could not find com.netflix.rxjava:rxjava-android:0.14.2.
Required by:
:MyApp-Android:unspecified

我做错了什么？

我想知道我是否应该有

repositories {
mavenCentral()
}

也在构建文件的顶层(不仅仅是在buildscript内部)，但添加它并没有帮助。

分辨率

我太草率了；确实帮助了"无法解析依赖项"。在那之后，我出现了编译错误，但这是因为实际上代码中(和libs中)的依赖项比上面dependendies中的四个项多。

因此，在我的情况下，我必须添加指向Maven Central的顶级repositories，并添加一些我们实际拥有的附加依赖项：

compile 'com.squareup.okhttp:okhttp:1.2.1'   
compile 'com.android.support:support-v4:13.0.0'
compile 'com.android.support:support-v13:13.0.0'

---

(原始、损坏)完整build.gradle:

buildscript {
repositories {
mavenCentral()
}
dependencies {
classpath 'com.android.tools.build:gradle:0.7.1'
}
}
apply plugin: 'android'
dependencies {
// compile fileTree(dir: 'libs', include: '*.jar')
compile 'com.google.code.gson:gson:2.2.4'
compile 'com.google.guava:guava:15.0'
compile 'com.netflix.rxjava:rxjava-core:0.14.2'
compile 'com.netflix.rxjava:rxjava-android:0.14.2'
}
android {
compileSdkVersion 19
buildToolsVersion "19"
defaultConfig {
minSdkVersion 14
targetSdkVersion 19
}
sourceSets {
main {
manifest.srcFile 'AndroidManifest.xml'
java.srcDirs = ['src']
resources.srcDirs = ['src']
aidl.srcDirs = ['src']
renderscript.srcDirs = ['src']
res.srcDirs = ['res']
assets.srcDirs = ['assets']
}
// Move the tests to tests/java, tests/res, etc...
instrumentTest.setRoot('tests')
// Move the build types to build-types/<type>
// For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
// This moves them out of them default location under src/<type>/... which would
// conflict with src/ being used by the main source set.
// Adding new build types or product flavors should be accompanied
// by a similar customization.
debug.setRoot('build-types/debug')
release.setRoot('build-types/release')
}
}

Answer 1

确实需要添加

repositories {
mavenCentral()
}

在build.gradle的顶层，指定在哪里搜索依赖项。

Answer 2

buildscript {
repositories {
google()
=>        mavenCentral()     <=
}