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我最近开始将我的Android构建从Ant移动到Gradle，然后我想使用cmake作为我的C++代码。这个版本目前运行良好，但是在创建aar文件（这是一个目前在Windows 10上构建的库项目）之前，没有共享对象被复制到他们需要的jniLibs文件夹中。当使用cmake for Android时将共享对象复制到jniLibs
我已经看过与./gradlew assembleDebug搭建时正在运行的任务。它们是：
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:checkDebugManifest
:app:preDebugAndroidTestBuild UP-TO-DATE
:app:preDebugUnitTestBuild UP-TO-DATE
:app:preReleaseBuild UP-TO-DATE
:app:preReleaseUnitTestBuild UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72221Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42221Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileLint UP-TO-DATE
:app:copyDebugLint UP-TO-DATE
:app:copyLibs
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:incrementalDebugJavaCompilationSafeguard UP-TO-DATE
:app:compileDebugJavaWithJavac UP-TO-DATE
:app:extractDebugAnnotations UP-TO-DATE
:app:mergeDebugShaders UP-TO-DATE
:app:compileDebugShaders UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:mergeDebugProguardFiles UP-TO-DATE
:app:packageDebugRenderscript UP-TO-DATE
:app:packageDebugResources UP-TO-DATE
:app:processDebugJavaRes UP-TO-DATE
:app:transformResourcesWithMergeJavaResForDebug UP-TO-DATE
:app:transformClassesAndResourcesWithSyncLibJarsForDebug UP-TO-DATE
:app:generateJsonModelDebug UP-TO-DATE
:app:externalNativeBuildDebug
building E:\path\to\app\Android\app\.externalNativeBuild\cmake\debug\libs\x86\libApp.so
building
:app:mergeDebugJniLibFolders
:app:transformNative_libsWithMergeJniLibsForDebug
:app:transformNative_libsWithSyncJniLibsForDebug
:app:bundleDebug
:app:compileDebugSources
:app:assembleDebug
这是一切都很好，但该文件夹app/src/main/jniLibs是空的，因此没有共享对象复制到AAR文件。因此，如何添加一个Gradle构建步骤来真正复制这些文件就成了问题。事实证明这很难做到。
方法1：
尝试创建一个副本任务:app:bundleDebug任务之前运行。我已经做了一些尝试做到这一点：
第一种可能性：
task copyLibs(type: Copy, dependsOn: 'bundleDebug') {
from ('.externalNativeBuild/cmake/debug/libs') {
include '**/libApp.so'
}
into 'src/main/jniLibs'
}
第二种可能性：
task copyLibs(type: Copy) {
from ('.externalNativeBuild/cmake/debug/libs') {
include '**/libApp.so'
}
into 'src/main/jniLibs'
}
tasks.whenTaskAdded { task ->
if (task.name == 'bundleDebug') {
task.dependsOn copyLibs
}
}
注意，路径是正确的，因为我可以强制副本做通过task copyLibs <<代替里面的复制步骤。然后将复制该构建的第二个，因为第一个共享对象不存在。 （由于任务在开始运行。）
方法2：
做副本的cmake。这是可行的，但并不理想。因此我没有走下这条路。
这里是我的build.gradle：
评论和更多信息是在下面的评论。
apply plugin: 'com.android.library'
// This task is run before everything else, so it does the copy on the *second* build,
// thereby copying the shared objects from the *previous* build.
//task copyLibs << {
// copy {
// from ('.externalNativeBuild/cmake/debug/libs') {
// include '**/libApp.so'
// }
// from ('.externalNativeBuild/cmake/release/libs') {
// include '**/libApp.so'
// }
// into 'src/main/jniLibs'
// includeEmptyDirs = false
// }
//}
// This is the task signature if tasks.whenTaskAdded below is *not* used. If both are
// used we get a circular dependency.
//task copyLibs(type: Copy, dependsOn: 'bundleDebug') {
task copyLibs(type: Copy) {
from ('.externalNativeBuild/cmake/debug/libs') {
include '**/libApp.so'
}
into 'src/main/jniLibs'
}
tasks.whenTaskAdded { task ->
if (task.name == 'bundleDebug') {}
// This dependecy *is* set. This can be seen by using task copyLibs(type: Copy, dependsOn: 'bundleDebug')
// together with this and get a circular dependency.
task.dependsOn copyLibs
}
}
// Prints:
// [task ':app:assemble', task ':app:assembleAndroidTest', task ':app:assembleDefault', task ':app:buildDependents',
// task ':app:buildNeeded', task ':app:check', task ':app:compileLint', task ':app:connectedCheck', task ':app:copyLibs',
// task ':app:deviceCheck', task ':app:extractProguardFiles', task ':app:lint', task ':app:preBuild', task ':app:sourceSets',
// task ':app:uninstallAll']
println(tasks)
android {
compileSdkVersion 22
// buildToolsVersion "22.0.1"
buildToolsVersion "24.0.2" // Tried using latest for good measures
defaultConfig {
minSdkVersion 12
targetSdkVersion 22
versionCode 1
versionName "1.0"
// Some defines to build certain architectures, e.g. with './gradlew -Ponly-x86 assembleDebug'. This is working.
if (project.hasProperty('only-x86')) {
ndkConfig.abiFilters = ["x86"] as Set<String>
}
else if (project.hasProperty('only-armeabi-v7a')) {
ndkConfig.abiFilters = ["armeabi-v7a"] as Set<String>
}
else {
ndkConfig.abiFilters = ["x86", "armeabi-v7a"] as Set<String>
}
externalNativeBuild {
cmake {
cppFlags "-fexceptions", "-frtti", "-Wno-error"
arguments "-DANDROID_STL=gnustl_static"
}
}
}
buildTypes {
release {
}
debug {
}
}
externalNativeBuild {
cmake {
path '../../../CMakeLists.txt'
}
beforeEvaluate(println("I ma printed at the top."))
afterEvaluate { println("I am printed before compiling.") }
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.1'
}
task clean(type: Delete) {
delete "${rootProject.buildDir}"
delete "${project.buildDir}"
delete "${project.projectDir}/.externalNativeBuild"
delete fileTree(dir: "${project.projectDir}/src/main/jniLibs", include: '**/*.so')
}
其他信息：
- cmake的版本：3.6.3155560
- 如果共享的对象是在jniLibs文件夹中的文件AAR正确创建的，所以构建实际上除了工作为复制步骤。