NDK开发 - Android Studio环境搭建

0.4.0是 Experimental Plugin 版本所以在使用的时候和正式版本的配置还是有挺大的差别的。[ http://tools.android.com/tech-docs/new-build-system/gradle-experimental/0-4-0]() 是官方文档，上面给出了 Experimental Plugin 版本使用说明，但是实际使用中还是发现了不少问题，比如签名配置。

Change Config

主要修改包括三个文件

./app/build.gradle ./build.gradle ./gradle/wrapper/gradle-wrapper.properties

./gradle/wrapper/gradle-wrapper.properties

每个插件版本都对应着一个gradle版本

因为我使用的是0.4.0版本所以需要将 ./gradle/wrapper/gradle-wrapper.properties 中配置改为

#Wed Oct 21 11:34:03 PDT 2015 distributionBase=GRADLE_USER_HOME distributionPath=wrapper/dists zipStoreBase=GRADLE_USER_HOME zipStorePath=wrapper/dists distributionUrl=https/://services.gradle.org/distributions/gradle-2.8-all.zip

./build.gradle

修改classpath为当前的0.4.0版本插件

buildscript {     repositories {         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle-experimental:0.4.0'          // 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 }

./app/build.gradle

./app/build.gradle 文件需要改动的东西比较多，很多配置与正式版本不一样。

• 用 'com.android.model.application' 替换 'com.android.application' 如果是library模块改为 com.android.model.library

• 在 android外层 添加根节点 model { }

• 需要添加 = 给属性赋值

• 添加元素需要用add函数

下面这个是我自己项目的配置：

apply plugin: 'com.android.model.application'  model {     def signConf      android {         compileSdkVersion = 23         buildToolsVersion = "23.0.2"          defaultConfig.with {             applicationId = "com.example.gnaix.ndk"             minSdkVersion.apiLevel = 15             targetSdkVersion.apiLevel = 22             versionCode = 1             versionName = "1.0"              buildConfigFields.with {                 create() {                     type = "int"                     name = "VALUE"                     value = "1"                 }             }         }     }          //编译设置     android.buildTypes {         release {             minifyEnabled = true             proguardFiles.add(file('proguard-rules.pro'))             signingConfig = signConf             ndk.with {                 debuggable = false             }         }         debug{             minifyEnabled = false             proguardFiles.add(file('proguard-rules.pro'))             ndk.with {                 debuggable = true             }         }     }      //签名设置     android.signingConfigs {         create("myConfig") {             keyAlias = 'gnaix'             keyPassword = '990828785'             storeFile = new File('/Users/xiangqing/Documents/workspace/android/gnaix.jks')             storePassword = '990828785'             storeType = "jks"             signConf = it         }     }          //ndk定义     android.ndk {         moduleName = "native"  //设置库(so)文件名称          //CFlags.add("-DCUSTOM_DEFINE")         ldLibs.addAll(["log", "android", "EGL", "GLESv1_CM"])         //ldFlags.add("-L/custom/lib/path")         stl = "stlport_static"     }      //ndk编译参数     android.productFlavors {         create("arm") {             ndk.abiFilters.add("armeabi")         }         create("arm7") {             ndk.abiFilters.add("armeabi-v7a")         }         create("arm8") {             ndk.abiFilters.add("arm64-v8a")         }         create("x86") {             ndk.abiFilters.add("x86")         }         create("x86-64") {             ndk.abiFilters.add("x86_64")         }         create("mips") {             ndk.abiFilters.add("mips")         }         create("mips-64") {             ndk.abiFilters.add("mips64")         }         // To include all cpu architectures, leaves abiFilters empty         create("all")     } }  dependencies {     compile fileTree(dir: 'libs', include: ['*.jar'])     testCompile 'junit:junit:4.12'     compile 'com.android.support:appcompat-v7:23.2.0' } 

Signing Config

apply plugin: "com.android.model.application"  model {     android {         compileSdkVersion = 23         buildToolsVersion = "23.0.2"     }      android.buildTypes {         release {             signingConfig = $("android.signingConfigs.myConfig")         }     }     android.signingConfigs {         create("myConfig") {             storeFile = new File("/path/to/debug.keystore")             storePassword = "android"             keyAlias = "androiddebugkey"             keyPassword = "android"             storeType = "jks"         }     } }

Source Set

默认情况下C/C++文件是存放在 src/main/jni 目录下。可以配置android.sources节点改变路径。不过我还是喜欢默认路径。

model {     android {         compileSdkVersion = 22         buildToolsVersion = "22.0.1"     }     android.ndk {         moduleName = "native"     }     android.sources {         main {             jni {                 source {                     srcDir "src"                 }             }         }     } }

如果有已经编译好的SO包要添加引用：

android.sources {         main {             jniLibs {                 dependencies {                     library file("./libs/armeabi/libnative.so") abi "armeabi"                     library file("./libs/armeabi-v7a/libnative.so") abi "armeabi-v7a"                     library file("./libs/x86/libnative.so") abi "x86"                     library file("./libs/mips/libnative.so") abi "mips"                 }             }         }     }

注意这里需要写SO包命全称，加上lib。

Other Config

apply plugin: "com.android.model.native"  model {     android {         compileSdkVersion = 21     }     android.ndk {         moduleName = "hello"     }     android.sources {         main {             jni {                 exportedHeaders {                     srcDir "src/main/headers"                 }             }         }     } }

下一篇将会介绍SO开发的JNI调用