使用Android Studio自带的NDK编译JNI

/**********************************************************************************
 *                      使用Android Studio自带的NDK编译JNI
 * 说明：
 *     省得自己另外去下载NDK，编译JNI，麻烦。
 *              
 *                                          2017-4-30 深圳 龙华民治樟坑村 曾剑锋
 *********************************************************************************/

一、参考文档：
    1. NDK环境搭建-windows篇
        http://www.jianshu.com/p/708e6bf68ae9
    2. Mistake in documentation/error message?
        https://github.com/android-ndk/ndk/issues/264
    3. 编译一个模块时出现undefined reference to `__android_log_print' 
        http://bbs.csdn.net/topics/360020076
    4. Android Studio 之 JNI 开发详解
        http://www.jianshu.com/p/bc2b46381d88
    5. 向您的项目添加 C 和 C++ 代码
        https://developer.android.com/studio/projects/add-native-code.html?hl=zh-cn

二、error：
    1. 错误1：
        1. 错误现象：
            D:zengjfSourceCodeAndroidandroid_appTest>ndk-build
            C:/Users/zengjf/AppData/Local/Android/Sdk/ndk-bundle/build//../build/core/build-binary.mk:687: Android NDK: Module zengjf depends on undefined modules: android_runtime nativehelper cutils utils log
            C:/Users/zengjf/AppData/Local/Android/Sdk/ndk-bundle/build//../build/core/build-binary.mk:701: *** Android NDK: Aborting (set APP_ALLOW_MISSING_DEPS=true to allow missing dependencies)    .  Stop.

            D:zengjfSourceCodeAndroidandroid_appTest>
        2. 解决方法
            1. C:UserszengjfAppDataLocalAndroidSdk
dk-bundleuildcoreuild-binary.mk
            2. 修改内容：
                ...
                ifdef undefined_libs
                    $(call __ndk_warning,Module $(LOCAL_MODULE) depends on undefined modules: $(undefined_libs))

                    # https://github.com/android-ndk/ndk/issues/208
                    # ndk-build didn't used to fail the build for a missing dependency. This
                    # seems to have always been the behavior, so there's a good chance that
                    # there are builds out there that depend on this behavior (as of right now,
                    # anything using libc++ on ARM has this problem because of libunwind).
                    #
                    # By default we will abort in this situation because this is so completely
                    # broken. A user may define APP_ALLOW_MISSING_DEPS to "true" in their
                    # Application.mk or on the command line to revert to the old, broken
                    # behavior.
                    APP_ALLOW_MISSING_DEPS=true    // add this line 
                    ifneq ($(APP_ALLOW_MISSING_DEPS),true)
                        $(call __ndk_error,Aborting (set APP_ALLOW_MISSING_DEPS=true to allow missing dependencies))
                    endif
                endif
                ...
    2. 错误2：
        1. 错误现象：
            undefined references to `__android_log_print' follow
        2. 解决方法：
            Android.mk文件中加入LOCAL_LDLIBS += -llog即可