android NDK如何解决Please define the NDK_PROJECT

从Google android官网下载最新的android ndk安装包android-ndk-r15b，自己配置环境使用ndk-build编译出现如下错误

$ ndk-build
Android NDK: Could not find application project directory !
Android NDK: Please define the NDK_PROJECT_PATH variable to point to it.
/home/用户路径/android-ndk-r15b/build/core/build-local.mk:151: *** Android NDK: Aborting . Stop.

原来最新的NDK使用命令行编译需要制定项目路径，Android.mk，Application.mk文件路径

ndk-build NDK_PROJECT_PATH=. NDK_APPLICATION_MK=Application.mk APP_BUILD_SCRIPT=Android.mk

注意：NDK_PROJECT_PATH=. 后面是一个英文句号“.”，表示当前路径

重新编译就可以了

$ ndk-build NDK_PROJECT_PATH=. NDK_APPLICATION_MK=Application.mk APP_BUILD_SCRIPT=Android.mk
Android NDK: APP_PLATFORM not set. Defaulting to minimum supported version android-14.
[armeabi] Compile++ thumb: HelloJni <= com_demo_Hello.cpp
[armeabi] StaticLibrary : libstdc++.a
[armeabi] SharedLibrary : libHelloJni.so
[armeabi] Install : libHelloJni.so => libs/armeabi/libHelloJni.so
[armeabi-v7a] Compile++ thumb: HelloJni <= com_demo_Hello.cpp
[armeabi-v7a] StaticLibrary : libstdc++.a
[armeabi-v7a] SharedLibrary : libHelloJni.so
[armeabi-v7a] Install : libHelloJni.so => libs/armeabi-v7a/libHelloJni.so
[x86] Compile++ : HelloJni <= com_demo_Hello.cpp
[x86] StaticLibrary : libstdc++.a
[x86] SharedLibrary : libHelloJni.so
[x86] Install : libHelloJni.so => libs/x86/libHelloJni.so

究其原因，谷歌的亲儿子android studio现在高度集成了NDK，所以在编译策略上有所改变，所幸改变不大。

Hello.java

package com.demo;public class Hello {public native static void native_HelloWorld();
}

com_demo_Hello.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_demo_Hello */#ifndef _Included_com_demo_Hello
#define _Included_com_demo_Hello
#ifdef __cplusplus
extern "C" {
#endif
/** Class:     com_demo_Hello* Method:    native_HelloWorld* Signature: ()V*/
JNIEXPORT void JNICALL Java_com_demo_Hello_native_1HelloWorld(JNIEnv *, jclass);#ifdef __cplusplus
}
#endif
#endif

com_demo_Hello.cpp

#include "com_demo_Hello.h"#include <android/log.h>#define TAG "HelloJni"/** Class:     com_demo_Hello* Method:    native_HelloWorld* Signature: ()V*/
JNIEXPORT void JNICALL Java_com_demo_Hello_native_1HelloWorld(JNIEnv * env, jclass clazz) {__android_log_print(ANDROID_LOG_VERBOSE, TAG, "Hello, World.");
}

Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)LOCAL_MODULE := libHelloJni
LOCAL_C_INCLUDES := com_demo_Hello.h
LOCAL_SRC_FILES := com_demo_Hello.cppLOCAL_LDLIBS := -lloginclude $(BUILD_SHARED_LIBRARY)

Application.mk

 APP_ABI := armeabi armeabi-v7a x86

NDK谷歌编译官网

https://developer.android.com/studio/projects/add-native-code.html#new-project

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