當我們在開發時需要用到包含本地方法的庫時,需要用ndk,會出現下列問題

1.可能會出現找不到ndk:

Error:Execution failed for task ':serialPortLibrary:compileReleaseNdk'.
> Error: Your project contains C++ files but it is not using a supported native build system.
Consider using CMake or ndk-build integration with the stable Android Gradle plugin:
 https://developer.android.com/studio/projects/add-native-code.html
or use the experimental plugin:
 http://tools.android.com/tech-docs/new-build-system/gradle-experimental.

解決辦法:在專案的gradle.properties檔案中加入這句

android.useDeprecatedNdk=true

2.加入上面一句時還可能報下列錯誤

Error:Execution failed for task ':serialPortLibrary:compileReleaseNdk'.
> com.android.ide.common.process.ProcessException: Error while executing 'E:\\ndk\\android-ndk-r10d\\android-ndk-r10d\\ndk-build.cmd' with arguments {NDK_PROJECT_PATH=null APP_BUILD_SCRIPT=F:\\androidstudioworkspace\\LearnTones\\serialPortLibrary\\build\\intermediates\\ndk\\release\\Android.mk APP_PLATFORM=android-19 NDK_OUT=F:\\androidstudioworkspace\\LearnTones\\serialPortLibrary\\build\\intermediates\\ndk\\release\\obj NDK_LIBS_OUT=F:\\androidstudioworkspace\\LearnTones\\serialPortLibrary\\build\\intermediates\\ndk\\release\\lib APP_ABI=all}

解決方法:在你匯入的包含jni的庫的build.gradle檔案中加入這句

sourceSets.main {
    jni.srcDirs = []
}