LightsService 灯光服务提供了LCD背光灯、键盘灯、按键灯、警示灯、电池灯、
消息通知灯、蓝牙灯、wifi灯等八种类型灯光；都是基于 android.hardware.light.V2_0.Type
现有需求需要新增第九中类型灯光控制，找到定义 Type 的地方
hardware\interfaces\light\2.0\types.hal
/** * These light IDs correspond to logical lights, not physical. * So for example, if your INDICATOR light is in line with your * BUTTONS, it might make sense to also light the INDICATOR * light to a reasonable color when the BUTTONS are lit. */ enum Type : int32_t { BACKLIGHT, KEYBOARD, BUTTONS, BATTERY, NOTIFICATIONS, ATTENTION, BLUETOOTH, WIFI, FLASH_TRIG, COUNT, };
hardware\interfaces\light\2.0\default\Light.cpp
const static std::map<Type, const char*> kLogicalLights = { {Type::BACKLIGHT, LIGHT_ID_BACKLIGHT}, {Type::KEYBOARD, LIGHT_ID_KEYBOARD}, {Type::BUTTONS, LIGHT_ID_BUTTONS}, {Type::BATTERY, LIGHT_ID_BATTERY}, {Type::NOTIFICATIONS, LIGHT_ID_NOTIFICATIONS}, {Type::ATTENTION, LIGHT_ID_ATTENTION}, {Type::BLUETOOTH, LIGHT_ID_BLUETOOTH}, {Type::WIFI, LIGHT_ID_WIFI}, {Type::FLASH_TRIG, LIGHT_ID_FLASH_TRIG} };
frameworks\base\services\core\java\com\android\server\lights\LightsManager.java
package com.android.server.lights; import android.hardware.light.V2_0.Type; public abstract class LightsManager { public static final int LIGHT_ID_BACKLIGHT = Type.BACKLIGHT; public static final int LIGHT_ID_KEYBOARD = Type.KEYBOARD; public static final int LIGHT_ID_BUTTONS = Type.BUTTONS; public static final int LIGHT_ID_BATTERY = Type.BATTERY; public static final int LIGHT_ID_NOTIFICATIONS = Type.NOTIFICATIONS; public static final int LIGHT_ID_ATTENTION = Type.ATTENTION; public static final int LIGHT_ID_BLUETOOTH = Type.BLUETOOTH; public static final int LIGHT_ID_WIFI = Type.WIFI; public static final int LIGHT_ID_FLASH_TRIG = Type.FLASH_TRIG; public static final int LIGHT_ID_COUNT = Type.COUNT; public abstract Light getLight(int id); }
修改如上几个地方后，编译报错
错误一、which does not match hash on record. This interface has been frozen. Do not change it!
ERROR: output handler failed. HIDL c++-sources: hardware/interfaces/light/2.0/types.hal hardware/interfaces/light/2.0/ILight.hal hardware/interfaces/current.txt => 'out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen/android/hardware/light/2.0/LightAll.cpp' FAILED: out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen/android/hardware/light/2.0/LightAll.cpp out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen/android/hardware/light/2.0/types.cpp rm -rf out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen && out/soong/host/linux-x86/bin/hidl-gen -R -p . -d out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen/android/hardware/light/2.0/LightAll.cpp.d -o out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0_genc++/gen -L c++-sources -randroid.hardware:hardware/interfaces -randroid.hidl:system/libhidl/transport android.hardware.light@2.0 ERROR: android.hardware.light@2.0::types has hash cd082c47c3940f2c4d4ef489c9f34e0c737dfcbd7dd09e0e270563e699a9d91e which does not match hash on record. This interface has been frozen. Do not change it! ERROR: Could not parse android.hardware.light@2.0::types. Aborting.
原因：Android P 开始，Google 对 Hidl 有了严格的限制。Google release 出来的 hidl 接口不允许修改。
需要重新生成修改 hardware 对应的 hashcode,错误中已经包含新的 hashcode 值 cd082c47c3940f2c4d4ef489c9f34e0c737dfcbd7dd09e0e270563e699a9d91e
如果没有此 hashcode 值，可以通过指令 hidl-gen -L hash -r 来生成,得到和错误提示中的hash值一模一样
$ hidl-gen -L hash -r android.hardware:hardware/interfaces -r android.hidl:system/libhidl/transport android.hardware.light@2.0::types cd082c47c3940f2c4d4ef489c9f34e0c737dfcbd7dd09e0e270563e699a9d91e android.hardware.light@2.0::types
将刚刚得到的新 hashcode 值更新到 hardware/interfaces/current.txt
可直接在文档末尾增加 cd082c47c3940f2c4d4ef489c9f34e0c737dfcbd7dd09e0e270563e699a9d91e android.hardware.light@2.0::types
错误二、error: VNDK library: android.hardware.light@2.0’s ABI has INCOMPATIBLE CHANGES Please check compatibility report at: out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.abidiff
Install: out/target/product/full_171_bsp/system/lib64/vndk-29/android.hardware.keymaster@3.0.so //hardware/interfaces/light/2.0:android.hardware.light@2.0 header-abi-diff android.hardware.light@2.0.so.abidiff FAILED: out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.abidiff (prebuilts/clang-tools/linux-x86/bin/header-abi-diff -allow-unreferenced-changes -allow-unreferenced-elf-symbol-changes -lib android.hardware.light@2.0 -arch arm64 -o 'out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.abidiff' -new 'out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.lsdump' -old prebuilts/abi-dumps/vndk/29/64/arm64_armv8-a/source-based/android.hardware.light@2.0.so.lsdump)|| (echo 'error: Please update ABI references with: $ANDROID_BUILD_TOP/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l android.hardware.light@2.0' && (mkdir -p $DIST_DIR/abidiffs && cp 'out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.abidiff' $DIST_DIR/abidiffs/) && exit 1) ****************************************************** error: VNDK library: android.hardware.light@2.0's ABI has INCOMPATIBLE CHANGES Please check compatibility report at: out/soong/.intermediates/hardware/interfaces/light/2.0/android.hardware.light@2.0/android_arm64_armv8-a_cortex-a53_vendor_shared/android.hardware.light@2.0.so.abidiff ****************************************************** error: Please update ABI references with: $ANDROID_BUILD_TOP/development/vndk/tools/header-checker/utils/create_reference_dumps.py -l android.hardware.light@2.0
根据提示执行指令 development/vndk/tools/header-checker/utils/create_reference_dumps.py -l android.hardware.light@2.0 ，发现报错
$ development/vndk/tools/header-checker/utils/create_reference_dumps.py -l android.hardware.light@2.0 Removing reference dumps... removing /platform/prebuilts/abi-dumps/vndk/28/32/arm_armv7-a-neon/source-based/android.hardware.gnss@1.0.so.lsdump.gz removing /platform/prebuilts/abi-dumps/ndk/28/32/arm_armv7-a-neon/source-based/android.hardware.gnss@1.0.so.lsdump.gz making libs for product: aosp_arm_ab Traceback (most recent call last): File "development/vndk/tools/header-checker/utils/create_reference_dumps.py", line 224, in <module> main() File "development/vndk/tools/header-checker/utils/create_reference_dumps.py", line 215, in main make_libs_for_product(args.libs, args.llndk, product) File "development/vndk/tools/header-checker/utils/create_reference_dumps.py", line 97, in make_libs_for_product make_libraries(libs, product, llndk_mode) File "/platform/development/vndk/tools/header-checker/utils/utils.py", line 146, in make_libraries make_targets(lib_targets, product) File "/platform/development/vndk/tools/header-checker/utils/utils.py", line 137, in make_targets stderr=subprocess.STDOUT) File "/usr/lib/python3.5/subprocess.py", line 581, in check_call raise CalledProcessError(retcode, cmd) subprocess.CalledProcessError: Command '['build/soong/soong_ui.bash', '--make-mode', '-j', 'android.hardware.gnss@1.0.vendor', 'TARGET_PRODUCT=aosp_arm_ab']' returned non-zero exit status 1
看到 making libs for product: aosp_arm_ab 这行，这个是因为我的项目 product名字不一样导致的，加上参数-product product_name 即可，product_name 是你的项目的 product 名称。
development/vndk/tools/header-checker/utils/create_reference_dumps.py -l android.hardware.light@2.0 -product full_171_bsp
AllowBuildBrokenUsesNetwork: true BuildBrokenUsesNetwork: true //hardware/interfaces/light/2.0:android.hardware.light@2.0 header-abi-linker android.hardware.light@2.0.so.lsdump [arm] Creating dumps for target_arch: arm and variant armv8-a Created abi dump at /prebuilts/abi-dumps/vndk/29/64/arm_armv8-a/source-based/android.hardware.light@2.0.so.lsdump Creating dumps for target_arch: arm64 and variant armv8-a Created abi dump at /prebuilts/abi-dumps/vndk/29/64/arm64_armv8-a/source-based/android.hardware.light@2.0.so.lsdump msg: Processed 2 libraries in 14.642458236217498 minutes
参考文章
