Java 外部本机生成问题，生成命令失败，android studio

我发布了一个关于我遇到的一个问题的问题，这是我的答案，但似乎比以前少了一个问题，但接下来的问题我真的不明白，因为我是用android studio开发应用程序android的新手。这些是给我安卓工作室的控制台错误：

第一:

null 
Build command failed. 
Error while executing process C:\Users\Raul del Rio\AppData\Local\Android\Sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {-HC:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app -BC:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app\.externalNativeBuild\cmake\debug\armeabi-v7a -DANDROID_ABI=armeabi-v7a -DANDROID_PLATFORM=android-15 -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app\build\intermediates\cmake\debug\obj\armeabi-v7a -DCMAKE_BUILD_TYPE=Debug -DANDROID_NDK=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle -DCMAKE_CXX_FLAGS=-std=c++14 -fexceptions -frtti -DCMAKE_TOOLCHAIN_FILE=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle\build\cmake\android.toolchain.cmake -DCMAKE_MAKE_PROGRAM=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\cmake\3.6.4111459\bin\ninja.exe -GAndroid Gradle - Ninja -DBUILD_TESTING=OFF -DANDROID_TOOLCHAIN=gcc-4.9} 
C:/Users/Raul del Rio/AndroidStudioProjects/MyApplication2 
../../AppData/Local/Android/Sdk/ndk-bundle/build/cmake/android.toolchain.cmake 
 (include)   CMakeLists.txt 
<a href="openFile:C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle\build\cmake\android.toolchain.cmake">Open File</a> 
 (include)   CMakeLists.txt 
<a href="openFile:C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle\build\cmake\android.toolchain.cmake">Open File</a> 
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage 
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage 
-- Configuring incomplete, errors occurred! 
Build command failed. 
Error while executing process C:\Users\Raul del Rio\AppData\Local\Android\Sdk\cmake\3.6.4111459\bin\cmake.exe with arguments {-HC:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app -BC:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app\.externalNativeBuild\cmake\release\armeabi-v7a -DANDROID_ABI=armeabi-v7a -DANDROID_PLATFORM=android-15 -DCMAKE_LIBRARY_OUTPUT_DIRECTORY=C:\Users\Raul del Rio\AndroidStudioProjects\MyApplication2\app\build\intermediates\cmake\release\obj\armeabi-v7a -DCMAKE_BUILD_TYPE=Release -DANDROID_NDK=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle -DCMAKE_CXX_FLAGS=-std=c++14 -fexceptions -frtti -DCMAKE_TOOLCHAIN_FILE=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\ndk-bundle\build\cmake\android.toolchain.cmake -DCMAKE_MAKE_PROGRAM=C:\Users\Raul del Rio\AppData\Local\Android\Sdk\cmake\3.6.4111459\bin\ninja.exe -GAndroid Gradle - Ninja -DBUILD_TESTING=OFF -DANDROID_TOOLCHAIN=gcc-4.9} 
CMake Error: CMAKE_C_COMPILER not set, after EnableLanguage
CMake Error: CMAKE_CXX_COMPILER not set, after EnableLanguage   
-- Configuring incomplete, errors occurred! 

这就是我为解决过去的问题所做的改变：

android {
    compileSdkVersion 28
    defaultConfig {
    applicationId "com.example.rauldelrio.myapplication"
    minSdkVersion 15
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    externalNativeBuild {
        cmake {
            arguments '-DBUILD_TESTING=OFF', '-DANDROID_TOOLCHAIN=gcc-4.9'
            cppFlags "-std=c++14 -fexceptions -frtti"
        }
    }
}

---

我也有这个问题。我认为我的C编译器/NDK环境由于某种原因被破坏了。但是，重新安装这些工具解决了问题

重新安装C/NDK环境的步骤：

• Android菜单：工具>SDK管理器
• 外观和行为>系统设置>Android SDK
• SDK工具选项卡
• 取消选中CMake、LLDB、NDK并单击“确定”（以卸载它们）
• 选中CMake、LLDB、NDK并单击“确定”（再次安装它们-需要一些时间）

强制刷新工具后，所有内容都会重新正确编译

android {
    compileSdkVersion 28
    defaultConfig {
    applicationId "com.example.rauldelrio.myapplication"
    minSdkVersion 15
    targetSdkVersion 28
    versionCode 1
    versionName "1.0"
    testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    externalNativeBuild {
        cmake {
            arguments '-DBUILD_TESTING=OFF', '-DANDROID_TOOLCHAIN=gcc-4.9'
            cppFlags "-std=c++14 -fexceptions -frtti"
        }
    }
}