android - 项目使用 ndk-build 而不是 Android studio 构建

Question

当我从命令行使用 ndk-build 命令构建我的 C/C++ 库时，它可以正常工作。

[armeabi] Prebuilt       : libVidyoClientApp.so <= jni/lib/
[armeabi] Install        : libVidyoClientApp.so => libs/armeabi/libVidyoClientApp.so
[armeabi] Compile thumb  : vidyoguestapi <= NCR.JNI.VidyoExports.c
[armeabi] Compile++ thumb: vidyoguestapi <= Ncr.Jni.Wrapper.cpp
In file included from m:/src/projects/java/VideoPlatform/app/src/main/jni/Ncr.Jni.Wrapper.cpp:6:0:
m:/src/projects/java/VideoPlatform/app/src/main/jni/include/Ncr.Jni.Wrapper.h:13:1: warning: 'typedef' was ignored in th
is declaration [enabled by default]
 };
 ^
[armeabi] Compile++ thumb: vidyoguestapi <= NCR.Vidyo.SDK.cpp
In file included from m:/src/projects/java/VideoPlatform/app/src/main/jni/NCR.Vidyo.SDK.cpp:7:0:
m:/src/projects/java/VideoPlatform/app/src/main/jni/include/NCR.Jni.Wrapper.h:13:1: warning: 'typedef' was ignored in th
is declaration [enabled by default]
 };
 ^
[armeabi] StaticLibrary  : libstdc++.a
[armeabi] SharedLibrary  : libvidyoguestapi.so
[armeabi] Install        : libvidyoguestapi.so => libs/armeabi/libvidyoguestapi.so

但是当我尝试在 Android studio 中构建我的项目时，出现编译错误:

M:\src\projects\java\VideoPlatform\app\build\intermediates\ndk\debug\obj/local/arm64-v8a/objs/vidyoguestapi/M_\src\projects\java\VideoPlatform\app\src\main\jni\NCR.JNI.VidyoExports.o: In function `Java_com_ncr_mobilevideo_videosdk_VidyoGuestClient_sdkLoginGuest':
M:\src\projects\java\VideoPlatform\app\src\main\jni\NCR.JNI.VidyoExports.c
Error:(50) undefined reference to `VidyoClientInitialize'
collect2.exe: error: ld returned 1 exit status
make.exe: *** [M:\src\projects\java\VideoPlatform\app\build\intermediates\ndk\debug\obj/local/arm64-v8a/libvidyoguestapi.so] Error 1

命令行 ndk-build 和 Android Studio 有什么不同？

仅供引用:我删除了引用 VidyoClientInitialize 的行，一切都在命令行和 Android Studio 中构建。所以看起来像是某种环境，但我不确定要看什么

Answer 1

现在，Android Studio 会即时创建一个新的 Android.mk 来编译您的 C/C++ 源代码，忽略您对其他预构建库的所有依赖，因为他无法处理它们。

来自 AS/gradle 的更好的 NDK 支持应该很快就会出来，但与此同时你可以停用它并让它从 libs/(armeabi,armeabi-v7a,x86,. ..) 通过在 build.gradle 中设置:

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
    }
}