如何知道我建立了使用NDK的构建的API级别？ [英] How to know which API level I'm building for using ndk-build?

问题描述

我想更好地了解使用NDK的构建时API级别的选择如何运作。

I'm trying to better understand how the selection of the api level works when using ndk-build.

我知道我可以明确地设置 APP_PLATFORM 中的 Application.mk 的，而其它NDK的构建将针对在清单与指定的API 安卓的minSdkVersion ，但如果我的应用程序的清单，同时具有安卓的minSdkVersion 和的android： targetSdkVersion ，这比的minSdkVersion高？

I know I can explicitly set APP_PLATFORM in Application.mk, and that otherwise ndk-build will target the api indicated in the manifest with android:minSdkVersion, but what if my application's manifest has both android:minSdkVersion and android:targetSdkVersion, and this is higher than minSdkVersion?

将NDK的构建目标在 targetSdkVersion ？我怎么能检查？

Will ndk-build target the targetSdkVersion? And how can I check that?

在的情况下，它的目标更高的API层，我想我将能够使用只适用于该级别原生API构建的，但如果我用较低的API级别在设备上运行的应用程序应该惨遭失败，所以在这种情况下，我应该实现某种API级检查的，是正确的？

In case it targets the higher api level, I guess that I will be able to build using native apis only available for that level, but if I run the application on a device with lower api level it should miserably fail, so in that case I should implement some sort of api level checking, is that correct?

推荐答案

将这个code到 Android.mk 刚过定义TARGET_PLATFORM和LOCAL_CFLAGS

Put this code into your Android.mk just after you define TARGET_PLATFORM and LOCAL_CFLAGS

ifeq ($(TARGET_PLATFORM),android-7)
    LOCAL_CFLAGS   += -DANDROID7
else
ifeq ($(TARGET_PLATFORM),android-8)
    LOCAL_CFLAGS   += -DANDROID8
else
ifeq ($(TARGET_PLATFORM),android-9)
    LOCAL_CFLAGS   += -DANDROID9
endif
endif
endif

现在，你可以检查此定义在C / C ++ code：

Now you can check this defines in your C/C++ code:

#if defined( ANDROID9 )
   // do stuff for API Level 9
#endif

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