gradle - 如何在Gradle中使用变量设置JAR版本？

Question

如何在Gradle中使用变量设置JAR版本？

如果我写

ext.nd4j_version = "1.0.0-beta2"
ext.nd4j_backend = "nd4j-native-platform"

dependencies {

    compile group: 'org.nd4j', name: '${nd4j_backend}', version: '${nd4j_version}' 

它找不到文物。

如果我写

nd4j_version = "1.0.0-beta2"
nd4j_backend = "nd4j-native-platform"

dependencies {

    compile group: 'org.nd4j', name: '${nd4j_backend}', version: '${nd4j_version}' 

然后就可以找到 Artifact ，但发出警告

Could not set unknown property 'nd4j_version' for root project 

更新

以下内容也不起作用

ext.nd4j_version = "1.0.0-beta2"
ext.nd4j_backend = "nd4j-native-platform"


dependencies {

    compile group: 'org.nd4j', name: '${project.ext.nd4j_backend}', version: '${project.ext.nd4j_version}' // works

和以下

ext.nd4j_version = "1.0.0-beta2"
ext.nd4j_backend = "nd4j-native-platform"


dependencies {

    compile group: 'org.nd4j', name: '${rootProject.ext.nd4j_backend}', version: '${rootProject.ext.nd4j_version}' 

和以下

ext {
    nd4j_version = "1.0.0-beta2"
    nd4j_backend = "nd4j-native-platform"
}


dependencies {

    compile group: 'org.nd4j', name: '${project.nd4j_backend}', version: '${project.ext.nd4j_version}'

请给出答案并提供解释，而不仅仅是随机工作语法。

Answer 1

删除'{$}'并按原样使用变量。

ext.nd4j_version = "1.0.0-beta2"
ext.nd4j_backend = "nd4j-native-platform"

dependencies {
   compile group: 'org.nd4j', name: nd4j_backend, version: nd4j_version 

编辑:您还可以将双引号与 ${}一起使用:

dependencies {
   compile group: 'org.nd4j', name: "${nd4j_backend}", version: "${nd4j_version}"