Android Studio Gradle：执行静态Java方法（从ANT迁移到Gradle）

Question

package de.myapp.gradle;

public class ConfigureCustomer {

    public static void main(String[] args){
        String server = args[0];
        String customer = args[1];
        System.out.println(String.format("Configuring customer %s with server %s", customer, server));
    }
}

<java failonerror="yes" classname="de.myapp.gradle.ConfigureCustomer ">
    <classpath>
        <path location="${base.dir}/bin/classes/"/>
    </classpath>
    <arg line="${customer}"/>
    <arg line="${server }"/>
</java>

apply plugin: 'com.android.application'
android {

    project.ext.set("customer", "")
    project.ext.set("server", "")

    dexOptions {
        preDexLibraries = false
    }

    compileSdkVersion 19
    buildToolsVersion "21.1.2"

    defaultConfig {
//Default configuration
    }


    signingConfigs {
        release {
//Configuration for release builds
        }
    }


    buildTypes {

        debug{
            server = "test"
        }

        release {
            server = "release"
        }
    }

    productFlavors {
        customerA{
            customer = "a"
        }
        customerB{
            customer = "b"
        }
        customerC{
            customer = "c"
        }
    }
}

task (configureCustomer,  type: JavaExec) {
    println 'Running customer configuration...'
    main = 'de.myapp.gradle.ConfigureCustomer'
    args customer, server
}

dependencies {
    //Dependency settings
}

所以现在当我通过命令行（windows）运行以下命令时：

graldew configureCustomer

我得到以下错误消息：

错误：找不到或加载主类DE.MyApp.Gradle.ConfigureCustomer

null

task (configureCustomer,  type: JavaExec) {
    println 'Running customer configuration...'
    main = 'de.myapp.gradle.ConfigureCustomer'
    classpath = sourceSets.main.runtimeClasspath
    args customer, server
}

在SourceSet容器上找不到属性“main

所以“sourcesets.main.runtimeClasspath”显然不存在于Android Studio的Gradle中。也许名字不一样。虽然我也尝试过这样设置类路径：

classpath = '${projectDir.getAbsolutePath()}\\build\\intermediates\\classes\\' + customer + '\\release'

我也试过这个：

classpath = '${projectDir.getAbsolutePath()}\\build\\intermediates\\classes\\' + customer + '\\release\\de\\myapp\\gradle'

错误：找不到或加载主类DE.MyApp.Gradle.ConfigureCustomer

Answer 1

public class ConfigureCustomer {

    public static void main(String[] args){
        String customer = args[0];
        String versionName = args[1];
        System.out.println(String.format("Configuring customer %s with versionName %s", customer, versionName ));
    }
}

android {
//Build type setup, signing configuration and other stuff
}

//After the android block my task definition follows:

task buildPrintout(type: JavaExec) {
    android.applicationVariants.all { variant ->
    //Runt he java task for every flavor
        variant.productFlavors.each { flavor ->
            println "Triggering customer configuration for flavor " + flavor.name
            if (variant.buildType.name.equals('release')) {
                //Run the java task only for release builds
                //Cant find the runtime classpath in android/gradle so I'll directly link to my jar file here. The jarfile contains the class I want to run (with the main method)
                classpath += files("libs/my-jarfile.jar")
                //This is the fully qualified name of my class, including package name (de.myapp.gradle) and the classname (ConfigureCustomer)
                main = "de.myapp.gradle.ConfigureCustomer"
                //Pass in arguments - in this case the customer's name and the version name for the app (from AndroidManifest.xml)
                args flavor.name, variant.versionName
            }
        }
    }
}

preBuild.doFirst {
    android.applicationVariants.all { variant ->
        variant.productFlavors.each { flavor ->
            if (variant.buildType.name.equals('release')) {
                javaexec {
                    println "Triggering customer build for flavor " + flavor.name
                    classpath += files("libs/my-jarfile.jar")
                    main = "de.myapp.gradle.ConfigureCustomer"
                    args flavor.name, variant.versionName
                }
                println "Done building customer for flavor " + flavor.name
            }
        }
    }
}

//Define our custom task and add the closures as an action
    task buildCustomer << {
        android.applicationVariants.all { variant ->
            variant.productFlavors.each { flavor ->
                if (variant.buildType.name.equals('release')) {
                        javaexec {
                            println "Triggering customer build for flavor " + flavor.name
                            classpath += files("libs/my-jarfile.jar")
                            main = "de.myapp.gradle.ConfigureCustomer"
                            args flavor.name, variant.versionName
                        }
                        println "Done building customer for flavor " + flavor.name
                }
            }
        }        
    }
    //Make preBuild depend on our task
    preBuild.dependsOn buildCustomer