Question

我想生成一些APK（x86，armeabi-v7a）。为了减少Google Play中APK的大小

但它不起作用。 Android studia说 import com.android.build.OutputFile - 无法解析符号＆＃39; OutputFile＆＃39;。在控制台我看到了。我尝试搜索谷歌的其他说明，并尝试自己做一些事情，但我不擅长gradle

Error:Cannot invoke method multiply() on null object

我的gradle文件是

// map for the version code

ext.versionCodes = ['armeabi-v7a':1, 'armeabi':2, 'x86':3]

import com.android.build.OutputFile

android.applicationVariants.all { variant ->
    // assign different version code for each output
    variant.outputs.each { output ->
        output.versionCodeOverride =
                project.ext.versionCodes.get(output.getFilter(OutputFile.ABI)) * 1000000 + android.defaultConfig.versionCode
    }
}

android {
    buildToolsVersion "20.0.0"
    compileSdkVersion 20
    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }


        instrumentTest.setRoot('tests')
    }
    defaultConfig {
        versionCode 11
        versionName '1.3'
    }
    productFlavors {
    }

    splits {
        abi {
            enable true
            reset()
            include 'x86', 'armeabi-v7a', 'armeabi'
            universalApk true
        }
    }





}




// needed to add JNI shared libraries to APK when compiling on CLI
tasks.withType(com.android.build.gradle.tasks.PackageApplication) { pkgTask ->
    pkgTask.jniFolders = new HashSet<File>()
    pkgTask.jniFolders.add(new File(projectDir, 'libs'))
}
// called every time gradle gets executed, takes the native dependencies of
// the natives configuration, and extracts them to the proper libs/ folders
// so they get packed with the APK.
task copyAndroidNatives() {
    file("libs/armeabi/").mkdirs();
    file("libs/armeabi-v7a/").mkdirs();
    file("libs/x86/").mkdirs();

    configurations.natives.files.each { jar ->
        def outputDir = null
        if (jar.name.endsWith("natives-armeabi-v7a.jar")) outputDir = file("libs/armeabi-v7a")
        if (jar.name.endsWith("natives-armeabi.jar")) outputDir = file("libs/armeabi")
        if (jar.name.endsWith("natives-x86.jar")) outputDir = file("libs/x86")
        if (outputDir != null) {
            copy {
                from zipTree(jar)
                into outputDir
                include "*.so"
            }
        }
    }
}
task run(type: Exec) {
    def path
    def localProperties = project.file("../local.properties")
    if (localProperties.exists()) {
        Properties properties = new Properties()
        localProperties.withInputStream { instr ->
            properties.load(instr)
        }
        def sdkDir = properties.getProperty('sdk.dir')
        if (sdkDir) {
            path = sdkDir
        } else {
            path = "$System.env.ANDROID_HOME"
        }
    } else {
        path = "$System.env.ANDROID_HOME"
    }

    def adb = path + "/platform-tools/adb"
    commandLine "$adb", 'shell', 'am', 'start', '-n', 'com.mygdx.crazyball.android/com.mygdx.crazyball.android.AndroidLauncher'
}
// sets up the Android Eclipse project, using the old Ant based build.
eclipse {
    // need to specify Java source sets explicitely, SpringSource Gradle Eclipse plugin
    // ignores any nodes added in classpath.file.withXml
    sourceSets {
        main {
            java.srcDirs "src", 'gen'
        }
    }

    jdt {
        sourceCompatibility = 1.6
        targetCompatibility = 1.6
    }

    classpath {
        plusConfigurations += [project.configurations.compile]
        containers 'com.android.ide.eclipse.adt.ANDROID_FRAMEWORK', 'com.android.ide.eclipse.adt.LIBRARIES'
    }

    project {
        name = appName + "-android"
        natures 'com.android.ide.eclipse.adt.AndroidNature'
        buildCommands.clear();
        buildCommand "com.android.ide.eclipse.adt.ResourceManagerBuilder"
        buildCommand "com.android.ide.eclipse.adt.PreCompilerBuilder"
        buildCommand "org.eclipse.jdt.core.javabuilder"
        buildCommand "com.android.ide.eclipse.adt.ApkBuilder"
    }
}
// sets up the Android Idea project, using the old Ant based build.
idea {
    module {
        sourceDirs += file("src");
        scopes = [COMPILE: [plus: [project.configurations.compile]]]

        iml {
            withXml {
                def node = it.asNode()
                def builder = NodeBuilder.newInstance();
                builder.current = node;
                builder.component(name: "FacetManager") {
                    facet(type: "android", name: "Android") {
                        configuration {
                            option(name: "UPDATE_PROPERTY_FILES", value: "true")
                        }
                    }
                }
            }
        }
    }
}
dependencies {
}

Answer 1

<强> TL; DR：

我遇到了同样的问题，对我而言，答案很简单。而不是在OutputFilter.ABI的调用中使用output.getFilter，使用OutputFilter.FilterType.ABI：

android.applicationVariants.all { variant ->
  variant.outputs.each { output ->
    def defaultCode = android.defaultConfig.versionCode
    def filter = output.getFilter(OutputFile.FilterType.ABI)
    def abiMultiplier = project.ext.versionCodes.get(filter)

    output.versionCodeOverride = abiMultiplier * 1000000 + defaultCode
  }
}

什么破坏了

这基本上就是你所拥有的，但重构了几行。关键区别在于对output.getFilter的调用。文档中的示例说使用OutputFile.ABI - 作为更新的工具版本（我不确定哪个），这是错误的。正确的参数是OutputFile.FilterType.ABI。

getFilter方法在类ApkVariantOutputImpl上定义。正如您在the source code for ApkVariantOutputImpl中所看到的，它只需要OutputFile.FilterType类型的单个参数; OutputFile.ABI是String，而Groovy（尽管它所做的所有其他魔法）显然不会将常量字符串转换为正确的枚举，从而产生空值。

<强>声明

仅供参考，我不得不通过不同版本的构建工具进行广泛挖掘以找到源链接 - 似乎这是API不稳定的一个领域。这适用于我，具有以下设置：

buildscript {
  dependencies {
    'com.android.tools.build:gradle:1.2.2'
  }
}

android {
  compileSdkVersion 22
  buildToolsVersion "22.0.1"

  // lots of stuff

  splits {
    abi {
      enable true
      reset()
      include 'x86', 'armeabi-v7a', 'mips'
    }
  }
}

如果你想构建一个通用的APK（包含所有不同的ABI），你需要考虑通用变量没有ABI过滤器的事实，即检查乘数为null并用有意义的东西替换它像零一样。

Answer 2

看起来它试图获取通用 APK的ABI失败，因为versionCodes地图中没有过滤器。在以某种方式应用乘法之前，您应该检查output.getFilter(OutputFile.ABI)的结果，例如：

android.applicationVariants.all { variant ->
    // assign different version code for each output
    variant.outputs.each { output ->
        def abiFilter = output.getFilter(OutputFile.ABI)
        def abiMultiplier = 0

        if (abiFilter != null) {
            abiMultiplier = project.ext.versionCodes.get(abiFilter)
        }

        output.versionCodeOverride =
            abiMultiplier * 1000000 + android.defaultConfig.versionCode
    }
}

如何生成多个apk（使用gradle，libGDX）

2 个答案: