带有opencv for android ndk的Android Studio，找不到opencv头文件 [英] Android Studio with opencv for android ndk, opencv header files not found

问题描述

我正在使用 Android Studio 进行 Android OpenCV 开发，但是当我编译在 Eclipse 中正常的项目时，出现此错误:

I'm getting to Android Studio for Android OpenCV developing, but when I compile the project which was ok in eclipse, I got this error:

D:\software\AndroidStudioProjects\CameraMe\openCVSamplefacedetection\src\main\jni\DetectionBasedTracker_jni.cpp:2:33:致命错误:opencv2/core/core.hpp:没有那个文件或目录

D:\software\AndroidStudioProjects\CameraMe\openCVSamplefacedetection\src\main\jni\DetectionBasedTracker_jni.cpp:2:33: fatal error: opencv2/core/core.hpp: No such file or directory

我猜没有找到 opencv 的头文件，但我不知道出了什么问题.

I guess the headers for opencv was not found, but I don't know what's wrong.

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

#OPENCV_CAMERA_MODULES:=off
#OPENCV_INSTALL_MODULES:=off
#OPENCV_LIB_TYPE:=SHARED
include D:\eclipse\OpenCV_2.4.9_android_sdk\sdk\native\jni\OpenCV.mk

LOCAL_SRC_FILES  := DetectionBasedTracker_jni.cpp
LOCAL_C_INCLUDES += $(LOCAL_PATH)
LOCAL_LDLIBS     += -llog -ldl

LOCAL_MODULE     := detection_based_tracker

include $(BUILD_SHARED_LIBRARY)

应用程序.mk

APP_STL := gnustl_static
APP_CPPFLAGS := -frtti -fexceptions
APP_ABI := armeabi-v7a
APP_PLATFORM := android-8

DetectionBasedTracker_jni.cpp

#include <DetectionBasedTracker_jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/contrib/detection_based_tracker.hpp>
......

推荐答案

当您使用 Android Studio 时，默认情况下会忽略您的 Makefile 并即时生成新的 Makefile，未正确引用 OpenCV，因为它不受支持.

as you're using Android Studio, your Makefiles are ignored by default and new ones are generated on-the-fly, without properly referencing OpenCV as it's not supported.

这就是当前在 Android Studio 中运行 NDK 构建的方式，它已被弃用，但正在开发一种更好的方法.

This is how NDK builds are currently working from Android Studio and it's deprecated while a better way to do it is in the work.

通过在 build.gradle 中执行此操作，您可以停用此内置 NDK 支持并改为使用您的 Makefile:

You can deactivate this built-in NDK support and get your Makefiles to be used instead, by doing this inside your build.gradle:

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

apply plugin: 'com.android.application'

android {
    ...

    sourceSets.main {
        jniLibs.srcDir 'src/main/libs' //set .so files directory to libs
        jni.srcDirs = [] //disable automatic ndk-build call
    }

    // 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
    }
}

顺便说一句，我看到你将 APP_ABI 设置为 armeabi-v7a，但 OpenCV 也支持 x86 和 mips>，因此您还可以轻松地将支持扩展到这些平台.

btw, I see you set APP_ABI only to armeabi-v7a, but OpenCV also supports x86 and mips, so you can also easily extend your support to these platforms.

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