如何在Android Sudio中使用我自己的Android.mk文件

Question

我在Android.mk文件中定义了一些变量(我正在为编译器传递一些标志),但每次构建我的项目时,都会Android.mk被覆盖.我假设这Gradle是负责任的,我应该在那里看？我如何使用自己的Android.mk文件？

背景资料:

Ubuntu64位,Android Studio1.0.1,JDK7.我NDK用O-LLVM NDK封装了我的版本,因此正在编辑Android.mk位于app/build/intermediates/ndk/debug(它是Android.mk我项目目录中唯一的文件)的文件,与doc O-LLVM提供示例的位置不同.

此外,没有Application.mk文件,所以我再次假设Gradle负责调用编译器？

任何帮助将不胜感激.

凯尔

---

更新的信息

build.gradle - (app)

//The following code until the "----" line is the new build.gradle config file
// that disables automatic Android.mk file generation

import org.apache.tools.ant.taskdefs.condition.Os
apply plugin: 'com.android.application'

android {

    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.md.helloworld"
        minSdkVersion 15
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
        ndk {
            moduleName "MyLib"
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    sourceSets.main {
        jniLibs.srcDir 'src/main/libs' //set libs as .so's location instead of jni
        jni.srcDirs = [] //disable automatic ndk-build call with auto-generated Android.mk file
    }

    // Call regular ndk-build (.cmd) script from the app directory
    task ndkBuild(type: Exec) {
        commandLine 'ndk-build', '-C', file('src/main/').absolutePath
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn ndkBuild
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
}

/*
//The following code is the original Android.mk file

apply plugin: 'com.android.application'

android {
    compileSdkVersion 21
    buildToolsVersion "21.1.2"

    defaultConfig {
        applicationId "com.md.helloworld"
        minSdkVersion 15
        targetSdkVersion 21
        versionCode 1
        versionName "1.0"
        //The only modified line
        ndk {
            moduleName "MyLib"
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
}
*/

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE    := helloWorld
LOCAL_SRC_FILES := main.c

LOCAL_LDLIBS := -static

include $(BUILD_EXECUTABLE)

Application.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

APP_ABI := armeabi

NDK_TOOLCHAIN_VERSION := clang3.4-obfuscator

include $(BUILD_EXECUTABLE)

请注意:我还没有传递任何cflags,我试图让Vanilla构建首先工作

Answer 1

是的,默认情况下,gradle android插件重新生成并使用自己的Android.mk文件来编译源代码.

您可以取消激活它并使用您自己的Android.mk文件,方法是在build.gradle配置文件中设置:

import org.apache.tools.ant.taskdefs.condition.Os
...     
android {
    ...

    sourceSets.main {
        jniLibs.srcDir 'src/main/libs' //set libs as .so's location instead of jniLibs
        jni.srcDirs = [] //disable automatic ndk-build call with auto-generated Android.mk
    }

    // call regular ndk-build(.cmd) script from app directory
    task ndkBuild(type: Exec) {
        if (Os.isFamily(Os.FAMILY_WINDOWS)) {
            commandLine 'ndk-build.cmd', '-C', file('src/main').absolutePath
        } else {
            commandLine 'ndk-build', '-C', file('src/main').absolutePath
        }
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn ndkBuild
    }
}

请注意,如果您只需要将自己的cflags传递给自动生成的Makefile,则可以在cFlags ""属性中设置这些内容以设置内部android { ndk {}}