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copied!<p>I don't have a gradle answer, but I think I now have a generic answer for any Android build tool. Here is my idea on how to create separate APK files for each supported processor architecture:</p> <ol> <li><p>Build your APK with any tools you use, containing all native code libraries you support, e.g. armeabi, armeabi-v7a, x86 and mips. I'll call it the 'original' APK file.</p></li> <li><p>Unzip your original APK into an empty folder, with any zip/unzip utility, best use command line tools, so that you could automate it with a shell script or batch file later.</p></li> <li><p>In the folder where original APK was uncompressed to, delete META-INF sub-folder (this contains the signatures, we'll need to re-sign the APK after all the modifications, so the original META-INF must be deleted).</p></li> <li><p>Change to lib sub-folder, and delete the sub-folders for any processor architectures you don't want in the new APK file. For example, leave only 'x86' sub-folder to make an APK for Intel Atom processors.</p></li> <li><p>Important: each APK for a different architecture, must have a different 'versionCode' number in AndroidManifest.xml, and the version code for e.g. armeabi-v7a must be slightly higher than the one for armeabi (read Google directions for creating multiple APKs here: <a href="http://developer.android.com/google/play/publishing/multiple-apks.html" rel="nofollow">http://developer.android.com/google/play/publishing/multiple-apks.html</a> ). Unfortunately, the manifest file is in a compiled binary form inside the APK. We need a special tool for modifying the versionCode there. See below.</p></li> <li><p>Once the manifest is modified with a new version code, and unnecessary directories and files deleted, re-zip, sign and align your smaller APK (use jarsigner and zipalign tools from Android SDK).</p></li> <li><p>Repeat the process for all other architectures you need to support, creating smaller APK files with slightly different version codes (but the same version name).</p></li> </ol> <p>The only outstanding issue is the way to modify ‘versionCode’ in binary manifest file. I could not find a solution for this for a long time, so finally had to sit down and crank my own code to do this. As the starting point, I took APKExtractor by Prasanta Paul, <a href="http://code.google.com/p/apk-extractor/" rel="nofollow">http://code.google.com/p/apk-extractor/</a>, written in Java. I’m the old school and still more comfortable with C++, so my little utility program 'aminc' written in C++ is now on GitHub at:</p> <p><a href="https://github.com/gregko/aminc" rel="nofollow">https://github.com/gregko/aminc</a></p> <p>I posted the entire Visual Studio 2012 solution, but the whole program is a single .cpp file which probably can be compiled on any platform. And here is a sample Windows .bat file I use to split my "fat" apk named atVoice.apk into 4 smaller files named atVoice_armeabi.apk, atVoice_armeabi-v7a.apk, atVoice_x86.apk and atVoice_mips.apk. I actually submit these files to Google Play (see my app at <a href="https://play.google.com/store/apps/details?id=com.hyperionics.avar" rel="nofollow">https://play.google.com/store/apps/details?id=com.hyperionics.avar</a>) and all works perfectly. Please also see <a href="https://github.com/gentakojima/apk-slice-by-arch" rel="nofollow">this Github project by Jorge Suárez de Lis</a>, who posts a similar script for Linux.</p> <pre><code>@echo off REM My "fat" apk is named atVoice.apk. Change below to whatever or set from %1 set apkfile=atVoice del *.apk REM My tools build atVoice-release.apk in bin project sub-dir. REM Copy it here for splitting. copy ..\bin\%apkfile%-release.apk %apkfile%.apk zip -d %apkfile%.apk META-INF/* REM ------------------- armeabi ------------------------ unzip %apkfile%.apk AndroidManifest.xml copy/y %apkfile%.apk %apkfile%.zip zip -d %apkfile%.zip lib/armeabi-v7a/* lib/x86/* lib/mips/* aminc AndroidManifest.xml 1 zip -f %apkfile%.zip ren %apkfile%.zip %apkfile%_armeabi.apk jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore d:\users\greg\.android\Hyperionics.keystore -storepass MyPass %apkfile%_armeabi.apk MyKeyName zipalign 4 %apkfile%_armeabi.apk %apkfile%_armeabi-aligned.apk del %apkfile%_armeabi.apk ren %apkfile%_armeabi-aligned.apk %apkfile%_armeabi.apk REM ------------------- armeabi-v7a --------------------- copy/y %apkfile%.apk %apkfile%.zip zip -d %apkfile%.zip lib/armeabi/* lib/x86/* lib/mips/* aminc AndroidManifest.xml 1 zip -f %apkfile%.zip ren %apkfile%.zip %apkfile%_armeabi-v7a.apk jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore d:\users\greg\.android\Hyperionics.keystore -storepass MyPass %apkfile%_armeabi-v7a.apk MyKeyName zipalign 4 %apkfile%_armeabi-v7a.apk %apkfile%_armeabi-v7a-aligned.apk del %apkfile%_armeabi-v7a.apk ren %apkfile%_armeabi-v7a-aligned.apk %apkfile%_armeabi-v7a.apk REM ------------------- x86 --------------------- copy/y %apkfile%.apk %apkfile%.zip zip -d %apkfile%.zip lib/armeabi/* lib/armeabi-v7a/* lib/mips/* aminc AndroidManifest.xml 9 zip -f %apkfile%.zip ren %apkfile%.zip %apkfile%_x86.apk jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore d:\users\greg\.android\Hyperionics.keystore -storepass MyPass %apkfile%_x86.apk MyKeyName zipalign 4 %apkfile%_x86.apk %apkfile%_x86-aligned.apk del %apkfile%_x86.apk ren %apkfile%_x86-aligned.apk %apkfile%_x86.apk REM ------------------- MIPS --------------------- copy/y %apkfile%.apk %apkfile%.zip zip -d %apkfile%.zip lib/armeabi/* lib/armeabi-v7a/* lib/x86/* aminc AndroidManifest.xml 10 zip -f %apkfile%.zip ren %apkfile%.zip %apkfile%_mips.apk jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore d:\users\greg\.android\Hyperionics.keystore -storepass MyPass %apkfile%_mips.apk MyKeyName zipalign 4 %apkfile%_mips.apk %apkfile%_mips-aligned.apk del %apkfile%_mips.apk ren %apkfile%_mips-aligned.apk %apkfile%_mips.apk del AndroidManifest.xml del %apkfile%.apk :done </code></pre> <p>Greg</p>

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