在WSL2编译安卓13并在WSL2和windows运行

本文最后更新于：2023年5月28日下午

在WSL2编译安卓13并在WSL2和windows运行

刚开始的时候，我是在master分支编译安卓的，结果运行emulator起不来，后来切换到android-13.0.0_r35就OK了。

在wsl2编译并运行

以下是编译和运行步骤：

wesley@Wesley:~/aosp$ source build/envsetup.sh
wesley@Wesley:~/aosp$ lunch sdk_pc_x86_64-userdebug
wesley@Wesley:~/aosp$ make -j18
wesley@Wesley:~/aosp$ emulator

可能出现的错误

1、MoTTY X11 proxy: Unsupported authorisation protocolMoTTY X11 proxy: Unsupported authorisation protocol

#普通用户报错，root用户不报错的解决方法：
cp /root/.Xauthority /home/xxx/

#普通用户不报错，root用户报错的解决方法：
cp /home/xxx/.Xauthority /root/

#xxx为用户名

2、kvm无权限访问

wesley@Wesley:~/aosp$ emulator
INFO    | Android emulator version 31.3.9.0 (build_id 8748233) (CL:N/A)
INFO    | Storing crashdata in: /tmp/android-wesley/emu-crash.db, detection is enabled
INFO    | Duplicate loglines will be removed, if you wish to see each indiviudal line launch with the -log-nofilter flag.
ProbeKVM: This user doesn't have permissions to use KVM (/dev/kvm).
The KVM line in /etc/group is: [kvm:x:108:wesley]

If the current user has KVM permissions,
the KVM line in /etc/group should end with ":" followed by your username.

If we see LINE_NOT_FOUND, the kvm group may need to be created along with permissions:
sudo groupadd -r kvm
# Then ensure /lib/udev/rules.d/50-udev-default.rules contains something like:
# KERNEL=="kvm", GROUP="kvm", MODE="0660"
# and then run:
sudo gpasswd -a $USER kvm

If we see kvm:... but no username at the end, running the following command may allow KVM access:
sudo gpasswd -a $USER kvm

You may need to log out and back in for changes to take effect.

ERROR   | x86_64 emulation currently requires hardware acceleration!
CPU acceleration status: This user doesn't have permissions to use KVM (/dev/kvm).
The KVM line in /etc/group is: [kvm:x:108:wesley]

If the current user has KVM permissions,
the KVM line in /etc/group should end with ":" followed by your username.

If we see LINE_NOT_FOUND, the
More info on configuring VM acceleration on Linux:
https://developer.android.com/studio/run/emulator-acceleration#vm-linux
General information on acceleration: https://developer.android.com/studio/run/emulator-acceleration.

解决办法：

1、创建kvm用户组

1 2	`sudo groupadd -r kvm #创建kvm用户组 sudo gpasswd -a $USER kvm #添加用户到kvm`

2、更改/dev/kvm访问权限

/dev/kvm默认权限是600，只有root用户可以访问，我们需要将其用户组更改为kvm并赋予660权限。

编辑/etc/wsl.conf

1 2	`[boot] command = /bin/bash -c 'chown -v root:kvm /dev/kvm && chmod 660 /dev/kvm'`

低版本的windows可能没有打开嵌套虚拟化，需要加入：

1 2	`[wsl2] nestedVirtualization=true`

重启wsl

1	`wsl.exe --shutdown`

在windows上运行

由于嵌套虚拟化，目前在wsl2直接运行模拟器会比较卡，我们需要切换到windows运行。

打包 AVD 映像 zip 文件

安卓12开始

1	`make -j18 emu_img_zip`

安卓12以下

1	`$ make -j18 sdk sdk_repo`

编译完成后会生成以 sdk-repo-linux-system-images 为前缀的 AVD 映像 zip 文件。

比如我的是\home\wesley\aosp\out\target\product\emulator64_x86_64\sdk-repo-linux-system-images-eng.wesley.zip

可以将其解压在当前文件夹或者其他windows路径，我这里选择就地解压：

获得windows访问路径：\\wsl.localhost\Ubuntu-20.04\home\wesley\aosp\out\target\product\emulator64_x86_64\x86_64

在powershell执行：

我已经将C:\Users\Windows\AppData\Local\Android\Sdk\emulator路径添加到环境变量了，Large_Desktop_API_33是我在android studio创建模拟器的名称。

1	`emulator -avd Large_Desktop_API_33 -sysdir \\wsl.localhost\Ubuntu-20.04\home\wesley\aosp\out\target\product\emulator64_x86_64\x86_64 -dns-server 8.8.8.8,114.114.114.114 -verbose`