Gradle无法解析支持库

Question

I am trying to use library called BetterPickers but can not even compile my project.

gradle.build contains this:

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.7.+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
}

android {
    compileSdkVersion 19
    buildToolsVersion '19.0.0'

    defaultConfig {
        minSdkVersion 7
        targetSdkVersion 19
    }
    buildTypes {
        release {
            runProguard false
            proguardFile getDefaultProguardFile('proguard-android.txt')
        }
    }
    productFlavors {
        defaultFlavor {
            proguardFile 'proguard-rules.txt'
        }
    }
}

dependencies {
    compile 'com.android.support:support-v4:18.0.+'
    compile 'com.nineoldandroids:library:2.4.0'
    compile 'com.doomonafireball.betterpickers:library:1.4.2'
}

But I keep getting this error: A problem occurred configuring project ':App'.

Could not resolve all dependencies for configuration ':App:_defaultFlavorDebugCompile'. Could not find com.google.android:support-v4:18. Required by: MyProject:App:unspecified > com.doomonafireball.betterpickers:library:1.4.2

I literally copied Gradle dependencies from their repository. And, even if I keep only the BetterPickers dependency, I still get the same error.

Answer 1

您必须从Android SDK管理器安装“ Android支持存储库”和“ Google存储库”才能使用支持库

Answer 2

The build script instructs Gradle to get com.android.support:support-v4:18.0.+ from Maven Central. However, Maven Central doesn't have such a library (version). Hence the error.

From what I can tell, the Gradle Android plugin will take care of this dependency automatically, and it doesn't have to be declared explicitly.

betterpickers not only declares a dependency on support-v4 , but also uses the old apklib library format. As far as I know, the Gradle Android plugin only supports the newer aar format. That's likely the cause for your problem.