android拷贝对象,使用cmake for Android时,将共享对象复制到jniLibs

布满荆棘的人生 2022-10-16 06:04 152阅读 0赞

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.构建当前运行正常,但在创建aar文件之前,没有共享对象被复制到jniLibs文件夹(这是一个库项目,目前在Windows 10上构建).

我查看了使用./gradlew assembleDebug构建时正在运行的任务.他们是：

: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

这一切都很好,但文件夹app / src / main / jniLibs为空,因此没有共享对象被复制到aar文件.那么问题是如何添加一个gradle构建步骤来实际复制这些文件.事实证明这很难做到.

方法1：

尝试创建要在：app：bundleDebug任务之前运行的复制任务.我做了几次尝试：

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

请注意,路径是正确的,因为我可以通过让任务copyLibs<

方法2：

在cmake中复制.这是可行的,但不可取.因此,我没有沿着这条路走下去.

这是我的build.gradle：

评论和更多信息如下所示.

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

else if (project.hasProperty('only-armeabi-v7a')) \{

ndkConfig.abiFilters = \["armeabi-v7a"\] as Set

else \{

ndkConfig.abiFilters = \["x86", "armeabi-v7a"\] as Set

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版本：3.6.3155560

>如果共享对象位于jniLibs文件夹中,则会正确创建aar文件,因此除了复制步骤之外,构建实际上正在工作.

解决方法:

我想到了最后怎么做.要从某个地方包含构建的共享对象,我们需要在build.gradle的android部分内使用sourceSets.main.jniLibs.srcDirs.以下示例直接从Android cmake输出目录中获取共享对象(用于调试).

例如：

android \{

...

defaultConfig \{

...

buildTypes \{

release \{

debug \{

sourceSets \{

main \{

// Bundle so files with the final apk.

// NOTE: Currently bundles all shared objects in that directory.

// It was not straightforward to exclude in Android sourceSets at the time of writing,

// see https://code.google.com/p/android/issues/detail?id=64957

jniLibs.srcDirs = \['.externalNativeBuild/cmake/debug/libs'\]

externalNativeBuild \{

cmake \{

path '../../../CMakeLists.txt'

标签：android,c,gradle,cmake

来源： https://codeday.me/bug/20190828/1756050.html

android拷贝对象,使用cmake for Android时,将共享对象复制到jniLibs

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