我是 Android 的新手,如果这看起来有点成熟,请原谅我。我有两个预构建的静态库,feta
(../../feta/build/libfeta.a
) 和 mish
(../../mish/build/libmish.a
),我有共享的 JNI 库。使用 JNI 库工作得很好,但我试图通过 JNI 库访问 feta
和 mish
。这两个库与 Android 项目一起不断更改和更新,因此每次构建它们时都复制它们并不是一个真正的选择(如果这样甚至可以解决链接问题),我不喜欢简单地复制将源文件导入到 Android 项目中。
我试过搜索,但大多数答案都使用旧版本的系统,要我修改Android.mk
,我没有。我使用的是最新版本的 Android Studio,它使用了 Gradle 插件。
我尝试在各种设置中使用来自十几个教程和 Stackoverflow 答案的所有配置,但没有成功。
如果您回答,请提供完整且有效的 build.gradle
,这样我就不会遇到与其他答案相同的问题(谢谢!)。
我在关注 this 之后问了这个问题教程,因此所有文件都会反射(reflect)这一点。
这是我遇到的构建错误:
Error:A problem occurred configuring project ':app'.
> The following model rules could not be applied due to unbound inputs and/or subjects:
android.sources { ... } @ app/build.gradle line 58, column 5
subject:
- android.sources Object [*]
repositories { ... } @ app/build.gradle line 39, column 5
subject:
- repositories Object [*]
[*] - indicates that a model item could not be found for the path or type.
这是我在 app
模块中的 build.gradle
文件:
apply plugin: 'com.android.application'
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.neonorb.mish_android"
minSdkVersion 15
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags "-std=c++14 -Wno-implicit-exception-spec-mismatch"
}
}
ndk {
// ${targetPlatform.getName()}
// ${buildType.getName()}
stl "c++_static"
abiFilters "x86_64"
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "CMakeLists.txt"
}
}
}
model {
repositories {
libs(PrebuiltLibraries) {
feta {
headers.srcDir "../../feta/include/"
binaries.withType(StaticLibraryBinary) {
staticLibraryFile = file("../../feta/build/libfeta.a")
}
}
}
libs(PrebuiltLibraries) {
mish {
headers.srcDir "../../mish/include/"
binaries.withType(StaticLibraryBinary) {
staticLibraryFile = file("../../mish/build/libmish.a")
}
}
}
}
android.sources {
main {
jni {
dependencies {
library "feta" linkage "static"
library "mish" linkage "static"
}
}
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.0'
compile 'com.google.android.gms:play-services-ads:10.0.1'
compile 'com.android.support:design:25.1.0'
testCompile 'junit:junit:4.12'
}
这是根 (mish-android
) 目录之一:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.2.3'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
这是我的 CMakeLists.txt
:
# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds it for you.
# Gradle automatically packages shared libraries with your APK.
add_library( # Sets the name of the library.
mish-android
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
# Associated headers in the same location as their source
# file are automatically included.
src/main/cpp/mish.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because system libraries are included in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in the
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
mish-android
# Links the target library to the log library
# included in the NDK.
${log-lib} )
如果有帮助的话,这是我的目录结构。
最佳答案
事实证明,我需要升级我的 Gradle 插件。我能够删除 CMakeLists.txt
。我还需要将我的 Gradle 包装器版本升级到 3.2 以支持新的实验性插件。
这是我的根 build.gradle
:
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
repositories {
jcenter()
}
dependencies {
//classpath 'com.android.tools.build:gradle:2.2.3'
classpath 'com.android.tools.build:gradle-experimental:0.9.0-beta1'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
这是我的应用
build.gradle
:
apply plugin: 'com.android.model.application'
model {
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
applicationId "com.neonorb.mish_android"
minSdkVersion.apiLevel 15
targetSdkVersion.apiLevel 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
ndk {
moduleName "mish-android"
ldLibs.add("log")
cppFlags.add("-std=c++14")
cppFlags.add("-Wno-implicit-exception-spec-mismatch")
// ${targetPlatform.getName()}
// ${buildType.getName()}
stl "c++_static"
abiFilters.addAll(["x86_64"])
// only build for x86_64 because that's all Feta and Mish support atm
}
buildTypes {
release {
minifyEnabled false
proguardFiles.add(file("proguard-rules.pro"))
}
}
sources {
main {
jni {
source {
srcDir "src"
}
dependencies {
library "feta" linkage "static"
library "mish" linkage "static"
}
}
}
}
}
repositories {
libs(PrebuiltLibraries) {
feta {
headers.srcDir "../../feta/include/"
binaries.withType(StaticLibraryBinary) {
staticLibraryFile = file("../../feta/build/libfeta.a")
}
}
}
libs(PrebuiltLibraries) {
mish {
headers.srcDir "../../mish/include/"
binaries.withType(StaticLibraryBinary) {
staticLibraryFile = file("../../mish/build/libmish.a")
}
}
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.1.0'
testCompile 'junit:junit:4.12'
}
关于android - 将静态库链接到 Android 中的 JNI 共享库,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41446393/