如何改变ndk android

Question

我在android studio中使用android ndk开发简单的ndk示例。运行我的app studio时显示以下错误。

Build command failed.
Error while executing process D:Sdkcmake3.6.4111459incmake.exe with 
arguments {--build D:Android StudioWorkspaceNDKSampleapp.externalNativeBuildcmakedebugarm64-v8a --target native-lib}
[1/2] Building CXX object CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.oFAILED: D:Sdk
dk-bundle	oolchainsllvmprebuiltwindows-x86_64inclang++.exe  --target=aarch64-none-linux-android --gcc-toolchain=D:/Sdk/ndk-bundle/toolchains/aarch64-linux-android-4.9/prebuilt/windows-x86_64 --sysroot=D:/Sdk/ndk-bundle/sysroot  -Dnative_lib_EXPORTS -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/libs/arm64-v8a/include -isystem D:/Sdk/ndk-bundle/sources/cxx-stl/gnu-libstdc++/4.9/include/backward -isystem D:/Sdk/ndk-bundle/sysroot/usr/include/aarch64-linux-android -D__ANDROID_API__=21 -g -DANDROID -ffunction-sections -funwind-tables -fstack-protector-strong -no-canonical-prefixes -Wa,--noexecstack -Wformat -Werror=format-security  -frtti -fexceptions -O0 -fno-limit-debug-info  -fPIC -MD -MT CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -MF CMakeFiles
ative-lib.dirsrcmaincpp
ative-lib.cpp.o.d -o CMakeFiles/native-lib.dir/src/main/cpp/native-lib.cpp.o -c "D:Android StudioWorkspaceNDKSampleappsrcmaincpp
ative-lib.cpp"
error: error reading 'D:Android StudioWorkspaceNDKSampleappsrcmaincpp
ative-lib.cpp'
1 error generated.ninja: build stopped: subcommand failed.

我有搜索很多，但无法找到正确的答案，为什么我在这里问。我还unintsall所有组件，并重新安装在我的工作室仍然有错误。

另一件事如果我从.CPP将文件扩展名更改为.C，整个项目都会得到编译，甚至可以正常运行。我不知道为什么它不适用于.CPP文件。

我正在使用的组件。

Android Stuido - 3.1.3

gradle - 3.1.0

cmake - 3.6.4111459

Android ndk - 17.1.4828580

lldb -3.1

本机lib.cpp

#include <jni.h>#include <string>extern "C" JNIEXPORT jstringJNICALLJava_com_mastek_ndksample_MainActivity_stringFromJNI(
    JNIEnv *env,
    jobject /* this */) {
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());}

的build.gradle

apply plugin: 'com.android.application'android {    compileSdkVersion 27
defaultConfig {
    applicationId "com.example.ndksample"
    minSdkVersion 15
    targetSdkVersion 27
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    externalNativeBuild {
        cmake {
            cppFlags "-frtti -fexceptions"
        }
    }

}

sourceSets {
    main {
        jniLibs.srcDirs = ['src/main/jniLibs']
    }
}

buildTypes {
    release {
        minifyEnabled false
        proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
    }
}
externalNativeBuild {
    cmake {
        path "CMakeLists.txt"
    }
}}dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.2'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'}

有人知道请帮我解决这个问题。提前致谢。

Answer 1

另一答案

如何改变ndk android

如何解决Android ndk build命令失败？