1.前言
上篇说到AAOS14 (Android Automotive OS 14)环境搭建完毕，今天记录一下操作模拟器多屏的过程。
从Android Automotive OS 14 Releases看，第一项更新重点介绍了
从目前的新能源车型看，越来越多的车型，配置了丰富的车内屏幕，比如仪表屏，中控屏，副驾屏，后排屏，车顶折叠屏，空调控制屏，扶手屏等等;
应该说是车的屏幕越来越多了，至于他们使用的多屏方案是否是基于AAOS，就不得而知了。
比如理想L9：
小鹏G9：
蔚来ET9：
Google应该也意识到，车企对多屏功能的要求正在不断提高，所以AAOS方案也在逐步完善这方面的功能；
AAOS从最早的
从上篇下载的模拟器运行情况看，默认
2.多屏代码
经过源码阅读发现，Google 在2022年已经有一笔提交了，
说明AAOS14模拟器对于Car已经支持multi-display
看到这里了，主要阅读一下，和
代码路径：
$(call inherit-product, device/generic/car/common/car_md.mk) $(call inherit-product, device/generic/car/sdk_car_x86_64.mk) ... PRODUCT_NAME := sdk_car_md_x86_64 PRODUCT_DEVICE := emulator_car64_x86_64 PRODUCT_BRAND := Android PRODUCT_MODEL := Car multi-display on x86_64 emulator ...
Makefile中引入了一个新的文件：
- 导入了multi-touch，里面定义了touch.displayId等信息
# this overwrites Android Emulator's default input devices for virtual displays in device/generic/goldfish/input/
PRODUCT_COPY_FILES +=
device/generic/car/emulator/multi-display/input/virtio_input_multi_touch_7.idc:$(TARGET_COPY_OUT_VENDOR)/usr/idc/virtio_input_multi_touch_7.idc
device/generic/car/emulator/multi-display/input/virtio_input_multi_touch_8.idc:$(TARGET_COPY_OUT_VENDOR)/usr/idc/virtio_input_multi_touch_8.idc
device/generic/car/emulator/multi-display/input/virtio_input_multi_touch_9.idc:$(TARGET_COPY_OUT_VENDOR)/usr/idc/virtio_input_multi_touch_9.idc
- 导入了display setting显示相关的设置
# Overrides Goldfish's default display settings
PRODUCT_COPY_FILES +=
device/generic/car/emulator/multi-display/display_layout_configuration.xml:$(TARGET_COPY_OUT_VENDOR)/etc/displayconfig/display_layout_configuration.xml
device/generic/car/emulator/multi-display/display_settings.xml:$(TARGET_COPY_OUT_VENDOR)/etc/display_settings.xml
可以根据屏幕id配置是否显示IME，是否显示SystemDecors，具体参考文档:display_settings.xml
- 开启feature功能:managed users
PRODUCT_COPY_FILES +=
frameworks/native/data/etc/android.software.managed_users.xml:$(TARGET_COPY_OUT_VENDOR)/etc/permissions/android.software.managed_users.xml
- 多屏overly一些配置config文件，配置SECONDARY_HOME
PRODUCT_PACKAGE_OVERLAYS +=
device/generic/car/emulator/multi-display/overlay
PRODUCT_PACKAGES +=
MultiDisplaySecondaryHomeTestLauncher
MultiDisplayTest
config配置：
...... <bool name="config_perDisplayFocusEnabled">true</bool> <bool name="config_supportsSystemDecorsOnSecondaryDisplays">true</bool> <string name="config_secondaryHomePackage" translatable="false">com.android.car.multidisplay</string> <bool name="config_multiuserVisibleBackgroundUsers">true</bool> ......
- multi-zone配置
PRODUCT_COPY_FILES +=
device/generic/car/emulator/multi-display/car_audio_configuration.xml:$(TARGET_COPY_OUT_VENDOR)/etc/car_audio_configuration.xml
PRODUCT_SYSTEM_DEFAULT_PROPERTIES +=
ro.vendor.simulateMultiZoneAudio=true
persist.sys.max_profiles=5
com.android.car.internal.debug.num_auto_populated_users=1
3.编译与调试
具体命令：
cd aosp source build/envsetup.sh lunch sdk_car_md_x86_64-userdebug make
运行模拟：
# 冷启动模拟器 emulator -no-snapshot # 帮助文档 emulator -help
其他调试命令:
# 获取当前屏幕activity focus焦点信息 dumpsys activity activities |grep mFoc # 启动app到指定屏幕 am start -n com.android.car.settings/.Settings_Launcher_Homepage --display 2 am start -n com.android.documentsui/.files.FilesActivity --display 3 am start -n com.android.contacts/.activities.PeopleActivity --display 4 # Display dump信息 dumpsys display # display id信息 dumpsys SurfaceFlinger --display-id # 截图四个屏 screencap -d 4619827259835644672 -p ./0.png screencap -d 4619827551948147201 -p ./1.png screencap -d 4619827124781842690 -p ./2.png screencap -d 4619827540095559171 -p ./3.png # 参考wm信息 wm size -d 0 wm density -d 0
4.修改屏幕配置
阅读完相关文件，尝试了一些调试命令, 模拟器主要建立了四个屏幕:
- Physical size: 1848x792 Physical density: 160
- Physical size: 968x792 Physical density: 160
- Physical size: 1408x792 Physical density: 160
- Physical size: 1408x792 Physical density: 160
除了内置cluster仪表屏幕，目前主流都是2K~4K屏，下面将分辨率改成1920x1080 220dpi ；
user@ubuntu:~/code/aosp/device/generic/car$ git diff
diff --git a/common/car_md.mk b/common/car_md.mk
old mode 100644
new mode 100755
index 4b5ed2b..8e108e3
--- a/common/car_md.mk
+++ b/common/car_md.mk
@@ -38,7 +38,7 @@ PRODUCT_COPY_FILES +=
EMULATOR_DYNAMIC_MULTIDISPLAY_CONFIG := false
BUILD_EMULATOR_CLUSTER_DISPLAY := true
# Set up additional displays
-EMULATOR_MULTIDISPLAY_HW_CONFIG := 1,968,792,160,0,2,1408,792,160,0,3,1408,792,160,0
+EMULATOR_MULTIDISPLAY_HW_CONFIG := 1,1320,1080,220,0,2,1920,1080,220,0,3,1920,1080,220,0
EMULATOR_MULTIDISPLAY_BOOTANIM_CONFIG := 4619827551948147201,4619827124781842690,4619827540095559171
ENABLE_CLUSTER_OS_DOUBLE:=true
diff --git a/common/config.ini.car_md b/common/config.ini.car_md
old mode 100644
new mode 100755
index 74e6abe..bb11221
--- a/common/config.ini.car_md
+++ b/common/config.ini.car_md
@@ -1,5 +1,5 @@
hw.audioInput=yes
-hw.lcd.density=160
+hw.lcd.density=220
hw.cpu.ncore=6
hw.gpu.enabled=yes
hw.camera.back=none
@@ -8,8 +8,8 @@ hw.mainKeys=no
hw.ramSize=6144
hw.keyboard=yes
skin.dynamic=yes
-skin.name=1848x792
-skin.path=1848x792
+skin.name=1920x1080
+skin.path=1920x1080
disk.dataPartition.size=6G
hw.accelerometer=yes
hw.accelerometer_uncalibrated=yes
diff --git a/emulator/multi-display/display_settings.xml b/emulator/multi-display/display_settings.xml
old mode 100644
new mode 100755
index 8f63b42..3373fe1
--- a/emulator/multi-display/display_settings.xml
+++ b/emulator/multi-display/display_settings.xml
@@ -5,19 +5,19 @@
<!-- Display settings for cluster -->
<display name="port:1"
- forcedDensity="160"
+ forcedDensity="220"
dontMoveToTop="true"/>
<!-- Display settings for 2nd Home -->
<display name="port:2"
shouldShowSystemDecors="true"
shouldShowIme="true"
- forcedDensity="160" />
+ forcedDensity="220" />
<!-- Display settings for 3rd Home -->
<display name="port:3"
shouldShowSystemDecors="true"
shouldShowIme="true"
- forcedDensity="160" />
+ forcedDensity="220" />
</display-settings>
5.UI效果
模拟器运行：
仪表屏：
中控屏：
副驾屏1：
副驾屏2：
6.总结
综上所述，梳理完成了multi-display配置，修改完多屏分辨率，为后续系统应用开发做好准备。
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