android java call inside a sample c/c++, and for people just getting started learning ndk

NdkDemo\.gitignore
.......\..radle\2.14.1\taskArtifacts\cache.properties
.......\.......\......\.............\cache.properties.lock
.......\.......\......\.............\fileHashes.bin
.......\.......\......\.............\fileSnapshots.bin
.......\.......\......\.............\fileSnapshotsToTreeSnapshotsIndex.bin
.......\.......\......\.............\taskArtifacts.bin
.......\.......\......\....s\_app_compileDebugJavaWithJavac\localClassSetAnalysis\localClassSetAnalysis.bin
.......\.......\......\.....\..............................\.....................\localClassSetAnalysis.lock
.......\.......\......\.....\..............................\.....JarClasspathSnapshot\localJarClasspathSnapshot.bin
.......\.......\......\.....\..............................\.........................\localJarClasspathSnapshot.lock
.......\.idea\compiler.xml
.......\.....\..pyright\profiles_settings.xml
.......\.....\encodings.xml
.......\.....\gradle.xml
.......\.....\libraries\animated_vector_drawable_24_2_1.xml
.......\.....\.........\appcompat_v7_24_2_1.xml
.......\.....\.........\espresso_core_2_2_2.xml
.......\.....\.........\espresso_idling_resource_2_2_2.xml
.......\.....\.........\exposed_instrumentation_api_publish_0_5.xml
.......\.....\.........\hamcrest_core_1_3.xml
.......\.....\.........\hamcrest_integration_1_3.xml
.......\.....\.........\hamcrest_library_1_3.xml
.......\.....\.........\javawriter_2_1_1.xml
.......\.....\.........\javax_annotation_api_1_2.xml
.......\.....\.........\javax_inject_1.xml
.......\.....\.........\jsr305_2_0_1.xml
.......\.....\.........\junit_4_12.xml
.......\.....\.........\rules_0_5.xml
.......\.....\.........\runner_0_5.xml
.......\.....\.........\support_annotations_24_2_1.xml
.......\.....\.........\support_compat_24_2_1.xml
.......\.....\.........\support_core_ui_24_2_1.xml
.......\.....\.........\support_core_utils_24_2_1.xml
.......\.....\.........\support_fragment_24_2_1.xml
.......\.....\.........\support_media_compat_24_2_1.xml
.......\.....\.........\support_v4_24_2_1.xml
.......\.....\.........\support_vector_drawable_24_2_1.xml
.......\.....\misc.xml
.......\.....\modules.xml
.......\.....\runConfigurations.xml
.......\.....\workspace.xml
.......\app\.externalNativeBuild\cmake\debug\arm64-v8a\.ninja_deps
.......\...\....................\.....\.....\.........\.ninja_log
.......\...\....................\.....\.....\.........\android_gradle_build.json
.......\...\....................\.....\.....\.........\build.ninja
.......\...\....................\.....\.....\.........\CMakeCache.txt
.......\...\....................\.....\.....\.........\.....Files\3.6.0-rc2\CMakeCCompiler.cmake
.......\...\....................\.....\.....\.........\..........\.........\CMakeCXXCompiler.cmake
.......\...\....................\.....\.....\.........\..........\.........\CMakeDetermineCompilerABI_C.bin
.......\...\....................\.....\.....\.........\..........\.........\CMakeDetermineCompilerABI_CXX.bin
.......\...\....................\.....\.....\.........\..........\.........\CMakeSystem.cmake
.......\...\....................\.....\.....\.........\..........\cmake.check_cache
.......\...\....................\.....\.....\.........\..........\CMakeOutput.log
.......\...\....................\.....\.....\.........\..........\native-lib.dir\src\main\cpp\native-lib.cpp.o
.......\...\....................\.....\.....\.........\..........\TargetDirectories.txt
.......\...\....................\.....\.....\.........\cmake_build_command.txt
.......\...\....................\.....\.....\.........\cmake_build_output.txt
.......\...\....................\.....\.....\.........\cmake_install.cmake
.......\...\....................\.....\.....\.........\rules.ninja
.......\...\....................\.....\.....\...eabi\.ninja_deps
.......\...\....................\.....\.....\.......\.ninja_log
.......\...\....................\.....\.....\.......\android_gradle_build.json
.......\...\....................\.....\.....\.......\build.ninja
.......\...\....................\.....\.....\.......\CMakeCache.txt
.......\...\......

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