在 Android apk 中打包 linux 二进制文件 [英] Packaging linux binary in Android apk

问题描述

如果我想在我的 .apk 文件中包含一个 linux 二进制文件(如 ffmpeg)(仅适用于基于 ARM 的设备)，这是否可以分发给非 root 手机?我知道可以使用 Runtime.exec() 调用包含的二进制文件，但这是推荐的做法吗?

If I want to include a linux binary (like ffmpeg) in my .apk file (only for ARM based devices), is this possible to distribute for non rooted phones? I know it's possible to call an included binary with Runtime.exec() but is it a recommended practice?

推荐答案

您可以将二进制文件存储在 res/raw 或 assets 文件夹中.这样，它将部署在设备上.你应该在安装后提取"它，你的 /data/data/your.package/files/ 是一个有效的目的地；/sdcard/ 不是.您的应用程序无法访问通常的 /data/local/ 目标，即使它适用于 adb shell.chmod 500 也可以.

You can store the binary in res/raw or in assets folder. This way it will be deployed on the device. You should "extract" it after the installation, your /data/data/your.package/files/ is a valid destination; /sdcard/ is not. The usual /data/local/ destination is not accessible for your app, even if it is for an adb shell. chmod 500 is also fine.

也就是说，带有 JNI 包装器的 libffmpeg.so 在 Android 应用中更易于使用，并且占用的系统资源更少.

This said, libffmpeg.so with JNI wrappers is easier to use in an Android app, and takes less system resources.

更新，2014 年 4 月您可以欺骗系统，并将您的二进制文件存储在 libs/armeabi 文件夹中，让安装程序为您提取此二进制文件.它将最终在 /data/data/your.package/lib/ 文件夹中，具有 +x 权限.这个 hack 还有一个很好的优势，它让系统选择正确的 ABI 来提取二进制文件:armeabi、armeabi-v7a、mips、或 x86.

Update, Aprl 2014 You can trick the system, and store your binary in libs/armeabi folder, and let the installer extract this binary for you. It will end up in /data/data/your.package/lib/ folder, with +x permissions. This hack has another nice advantage, it lets the system choose the correct ABI to extract the binary for: armeabi, armeabi-v7a, mips, or x86.

诀窍是遵循共享库命名约定.因此，当您将 ffmpeg 可执行文件放入 libs/armeabi 时，请将文件重命名为 lib_ffmpeg_.so.当然，您还将Runtime.exec() 使用完整路径和新添加的前缀和后缀的文件.

The trick is to follow the shared library naming convention. So, when you put ffmpeg executable into libs/armeabi, rename the file to lib_ffmpeg_.so. Naturally, you will also Runtime.exec() the file using the full path, and the newly added prefix and suffix.

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