Android的NDK：在不同的体系结构ABI使用相同的库 [英] Android NDK: Use same library across different ABI architectures

问题描述

这是一个后续问题：<一href=\"http://stackoverflow.com/questions/19358130/android-ndk-compiling-different-libraries-for-different-architectures\">Android NDK：编译不同体系结构不同的库

我的问题是我有两个C ++与NDK编译JNI库。一个是小和结构相关的，而另一个是一个很大的库，它是相同的不同的体系结构。为了使小.apk文件，我宁愿只有一个大图书馆的副本。我尝试了文件夹结构是这样的：

 的lib / armeabi / libbig.so
LIB / armeabi / libsmall.so
LIB / armeabi-V7A / libsmall.so
 

然而，当我跑它V7设备上，我得到了一个的UnsatisfiedLinkError。当我在设备上的libs文件夹选择，只有libsmall.so安装。我的问题是：是否有可能有一些图书馆体系结构无关的而有些则是体系结构相关。事情是这样的：

 的lib / armeabi / libsmall.so
LIB / armeabi-V7A / libsmall.so
LIB /所有/ libbig.so
 

解决方案

我相信，如果V7A提升是如此重要，那么你可以简单地放弃对非V7设备的支持。也有建立和上传不同的ABI单独的APK的选项：的https： //developer.android.com/google/play/publishing/multiple-apks.html 。

最后，你可以重新排列库如下：

 的lib / armeabi / libbig.so  - ＆GT; LIB / armeabi / libbig.so
LIB / armeabi / libsmall.so  - ＆GT; LIB / armeabi / libsmall.so
LIB / armeabi-V7A / libsmall.so  - ＆GT; LIB / armeabi / libsmall-v7a.so
 

这样，你的Java应用程序应该选择小或小V7A的<一个href=\"http://developer.android.com/reference/java/lang/System.html#loadLibrary%28java.lang.String%29\"相对=nofollow>的System.loadLibrary（）。

This is a followup question to : Android NDK : Compiling different libraries for different architectures

My issue is I have two c++ JNI libraries compiled with NDK. One is small and architecture dependent, and the other is a big library which is the same across architectures. In order to make the .apk smaller, I would rather have only one copy of the big library. I tried a folder structure like this:

lib/armeabi/libbig.so
lib/armeabi/libsmall.so
lib/armeabi-v7a/libsmall.so

However, when I ran it on a v7 device, I got an UnsatisfiedLinkError. When I checked in the libs folder on the device, only libsmall.so was installed. My question is: is it possible to have some libraries architecture-independent while others are architecture-dependent. Something like this:

lib/armeabi/libsmall.so
lib/armeabi-v7a/libsmall.so
lib/all/libbig.so

解决方案

I believe that if v7a boost is so important, then you can simply drop support for non-v7 devices. There is also the option to build and upload separate APKs for different ABIs: https://developer.android.com/google/play/publishing/multiple-apks.html.

Finally, you can rearrange the libraries as follows:

lib/armeabi/libbig.so           --> lib/armeabi/libbig.so
lib/armeabi/libsmall.so         --> lib/armeabi/libsmall.so
lib/armeabi-v7a/libsmall.so     --> lib/armeabi/libsmall-v7a.so

This way, your Java app should choose "small" or "small-v7a" for System.loadLibrary().

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