Building aapt binaries.

The steps taken for building our modified aapt binaries for apktool.

Getting the modified `frameworks/base` repo.

First step is using the platform_frameworks_base repo.

While previously unorganized, the repo now follows the branch naming convention depending on the current Android version. So apktool_7.1 corresponds to the 7.1 Android release. This branch should work for all android-7.1.x tags for AOSP.

We didn't follow this naming convention until Android 7.1. So don't go looking for older versions.

This repo has a variety of changes applied. These changes range from disabling optimizations to lessening the rules that aapt regularly has. We do this because apktool's job is to not fix apks, but rather keep them as close to the original as they were.

First we need the AOSP source

As cheesy as it is, just follow this downloading link in order to get the source downloaded. This is no small download, expect to use 40-60GB.

After that, you need to build AOSP via this documentation guide. Now we aren't building the entire AOSP package, the initial build is to just see if you are capable of building it.

We check out a certain tag. Currently we use android-7.1.1_r4.

Including our modified `frameworks/base` package.

There is probably a more automated way to do this, but for now just remove all the files in frameworks/base. Now you can clone the modified repo from first step into this directory.

Building the aapt binary.

The steps below are different per flavor and operating system. For cross compiling the Windows binary on Unix, we lose the ability to quickly build just the aapt binary. So the Windows procedure builds the entire Sdk.

Unix 32

source build/envsetup.sh
lunch sdk-eng
make OUT_DIR=out-x32 LOCAL_MULTILIB=32 USE_NINJA=false aapt
strip out-x32/host/linux-x86/bin/aapt

Unix 64

source build/envsetup.sh
lunch sdk-eng
make OUT_DIR=out-x64 LOCAL_MULTILIB=64 USE_NINJA=false aapt
strip out-x64/host/linux-x86/bin/aapt

Windows

source build/envsetup.sh
lunch sdk-eng
make PRODUCT-sdk-win_sdk USE_NINJA=false
strip out/host/windows-x86/bin/aapt.exe

Mac 32

source build/envsetup.sh
lunch sdk-eng
make OUT_DIR=out-x32 LOCAL_MULTILIB=32 USE_NINJA=false aapt

Mac 64

source build/envsetup.sh
lunch sdk-eng
make OUT_DIR=out-x64 LOCAL_MULTILIB=64 USE_NINJA=false aapt

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