使用Android Studio导入AOSP源码的奇技淫巧

通常情况下，对于整个AOSP源码，我们一般只关心Framework和某些App，至于其他模块可能关心的比较少，因此没有必要全部作为源码导入。

修改移除不需要关心的模块

在AOSP源码目录，修改下面文件：

development/tools/idegen/excluded-paths

在最后面添加：
ps：我现在是去除了framework和libcore之外的所有模块，如果想留下某些模块，可以自己适当修改。

# remove projects except framework
#^out
^disregard
^kernel
^bootstrap.bash -> build/soong/bootstrap.bash
^Android.bp -> build/soong/root.bp
^build
^vendor
^tools
^toolchain
^test
^system
^shortcut-fe
^sdk
^prebuilts
^platform_testing
^pdk
^packages
^oem-release
^libnativehelper
#^libcore
^libcore/.*/test$
^libcore/.*/test-rules$
^libcore/test-rules$
^libcore/metrictests$
^hardware
#^frameworks
^frameworks/support/samples$
^frameworks/.*/.*tests$
^frameworks/.*/test$
^frameworks/.*/test-base$
^frameworks/.*/core-testing$
^frameworks/.*/testing$
^frameworks/.*/testutils$
^frameworks/.*/loadtest$
^frameworks/.*/testtensorflow$
^frameworks/.*/testrunner-src$
^frameworks/.*/androidTest$
^flashing-files
^external
^device
^build.sh
^development
^developers
^dalvik
^cts
^compatibility
^Makefile
^bootable
^bionic
^art

编译 idegen 模块

在AOSP源码根目录：

source build/envsetup.sh

including device/generic/car/vendorsetup.sh
including device/generic/mini-emulator-arm64/vendorsetup.sh
including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh
including device/generic/mini-emulator-x86_64/vendorsetup.sh
including device/generic/mini-emulator-x86/vendorsetup.sh
including device/generic/uml/vendorsetup.sh
including device/google/muskie/vendorsetup.sh
Created 12 symlinks out of 12 mapped links..
including sdk/bash_completion/adb.bash

编译生成 idegen.jar：

make idegen

或者：

mmm development/tools/idegen/

// 编译完成
[100% 3/3] out/soong/.bootstrap/bin/soong_build out/soong/build.ninja
[ 50% 1/2] glob art
[100% 4/4] Install: out/host/linux-x86/framework/idegen.jar

#### build completed successfully (01:26 (mm:ss)) ####

生成 android.ipr 和 android.iml

$ development/tools/idegen/idegen.sh
Read excludes: 10ms
Traversed tree: 14696ms

运行完毕上面的命令之后，就在根目录生成了2个文件：

android.ipr 和 android.iml

开始导入源码

排除不必要的模块，提高加载速度
打开android.iml, 找到excludeFolder属性，我们可以看到默认有14个模块是被排除了，不会被导入的。

<excludeFolder url="file://$MODULE_DIR$/./external/emma"/>
<excludeFolder url="file://$MODULE_DIR$/./external/jdiff"/>
<excludeFolder url="file://$MODULE_DIR$/out/eclipse"/>
<excludeFolder url="file://$MODULE_DIR$/.repo"/>
<excludeFolder url="file://$MODULE_DIR$/external/bluetooth"/>
<excludeFolder url="file://$MODULE_DIR$/external/chromium"/>
<excludeFolder url="file://$MODULE_DIR$/external/icu4c"/>
<excludeFolder url="file://$MODULE_DIR$/external/webkit"/>
<excludeFolder url="file://$MODULE_DIR$/frameworks/base/docs"/>
<excludeFolder url="file://$MODULE_DIR$/out/host"/>
<excludeFolder url="file://$MODULE_DIR$/out/target/common/docs"/>
<excludeFolder url="file://$MODULE_DIR$/out/target/common/obj/JAVA_LIBRARIES/android_stubs_current_intermediates"/>
<excludeFolder url="file://$MODULE_DIR$/out/target/product"/>
<excludeFolder url="file://$MODULE_DIR$/prebuilt"/>

但实际上，整个AOSP代码中，一般情况下，我们只是关心framework模块，因此可以根据自己的需求多去掉一些模块。
比如把下面这些加到上面那14行之下：

<excludeFolder url="file://$MODULE_DIR$/abi"/>
<excludeFolder url="file://$MODULE_DIR$/art"/>
<excludeFolder url="file://$MODULE_DIR$/bionic"/>
<excludeFolder url="file://$MODULE_DIR$/bootable"/>
<excludeFolder url="file://$MODULE_DIR$/build"/>
<excludeFolder url="file://$MODULE_DIR$/cts"/>
<excludeFolder url="file://$MODULE_DIR$/dalvik"/>
<excludeFolder url="file://$MODULE_DIR$/developers"/>
<excludeFolder url="file://$MODULE_DIR$/development"/>
<excludeFolder url="file://$MODULE_DIR$/device"/>
<excludeFolder url="file://$MODULE_DIR$/docs"/>
<excludeFolder url="file://$MODULE_DIR$/external"/>
<excludeFolder url="file://$MODULE_DIR$/hardware"/>
<excludeFolder url="file://$MODULE_DIR$/libcore"/>
<excludeFolder url="file://$MODULE_DIR$/libnativehelper"/>
<excludeFolder url="file://$MODULE_DIR$/ndk"/>
<excludeFolder url="file://$MODULE_DIR$/out"/>
<excludeFolder url="file://$MODULE_DIR$/pdk"/>
<excludeFolder url="file://$MODULE_DIR$/prebuilts"/>
<excludeFolder url="file://$MODULE_DIR$/sdk"/>
<excludeFolder url="file://$MODULE_DIR$/system"/>
<excludeFolder url="file://$MODULE_DIR$/tools"/>
<excludeFolder url="file://$MODULE_DIR$/kernel"/>

这样修改之后，打开速度会快很多。