自 2025 年 3 月 27 日起,我们建议您使用 android-latest-release
而非 aosp-main
构建 AOSP 并为其做出贡献。如需了解详情,请参阅 AOSP 的变更。
ConfigStore
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
在 Android 中,系统属性存储在 ConfigStore 类中。ConfigStore 使用 build 标志在供应商分区中存储配置值,系统分区中的服务使用 HIDL 访问这些值。
系统属性使用
PRODUCT_DEFAULT_PROPERTY_OVERRIDES
在供应商分区的
default.prop
中存储系统属性,服务使用
sysprop
读取这些属性。
ConfigStore HAL 保留在 AOSP 中以支持旧版供应商分区。在搭载 Android 10 的设备上,surfaceflinger
首先读取系统属性;如果没有为 SurfaceFlingerProperties.sysprop
中的配置项定义任何系统属性,surfaceflinger
会回退到 ConfigStore HAL。
build 标记和系统属性
ConfigStore 中的每个 build 标志都有一个匹配的系统属性,如下表所示。
构建标志 |
系统属性 |
TARGET_FORCE_HWC_FOR_VIRTUAL_DISPLAYS
|
ro.surface_flinger.force_hwc_copy_for_virtual_displays
|
TARGET_HAS_HDR_DISPLAY
|
ro.surface_flinger.has_HDR_display
|
TARGET_HAS_WIDE_COLOR_DISPLAY
|
ro.surface_flinger.has_wide_color_display
|
NUM_FRAMEBUFFER_SURFACE_BUFFERS
|
ro.surface_flinger.max_frame_buffer_acquired_buffers
|
MAX_VIRTUAL_DISPLAY_DIMENSION
|
ro.surface_flinger.max_virtual_display_dimension
|
PRIMARY_DISPLAY_ORIENTATION
|
ro.surface_flinger.primary_display_orientation
|
PRESENT_TIME_OFFSET_FROM_VSYNC_NS
|
ro.surface_flinger.present_time_offset_from_vsync_ns
|
TARGET_RUNNING_WITHOUT_SYNC_FRAMEWORK
|
ro.surface_flinger.running_without_sync_framework
|
SF_START_GRAPHICS_ALLOCATOR_SERVICE
|
ro.surface_flinger.start_graphics_allocator_service
|
TARGET_USE_CONTEXT_PRIORITY
|
ro.surface_flinger.use_context_priority
|
USE_VR_FLINGER
|
ro.surface_flinger.use_vr_flinger
|
VSYNC_EVENT_PHASE_OFFSET_NS
|
ro.surface_flinger.vsync_event_phase_offset_ns
|
SF_VSYNC_EVENT_PHASE_OFFSET_NS
|
ro.surface_flinger.vsync_sf_event_phase_offset_ns
|
新系统属性
Android 10 包含以下新系统属性:
ro.surface_flinger.default_composition_dataspace
ro.surface_flinger.default_composition_pixel_format
ro.surface_flinger.use_color_management
ro.surface_flinger.wcg_composition_dataspace
ro.surface_flinger.wcg_composition_pixel_format
ro.surface_flinger.display_primary_red
ro.surface_flinger.display_primary_green
ro.surface_flinger.display_primary_blue
ro.surface_flinger.display_primary_white
ro.surface_flinger.protected_contents
ro.surface_flinger.set_idle_timer_ms
ro.surface_flinger.set_touch_timer_ms
ro.surface_flinger.use_smart_90_for_video
ro.surface_flinger.protected_contents
ro.surface_flinger.support_kernel_idle_timer
如需详细了解这些属性,请参阅 frameworks/native/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop
。
使用 SurfaceFlingerProperties
在 SurfaceFlingerProperties 库的以下示例中,函数名称是 SurfaceFlingerProperties.sysprop
中的 api_name
。
cc_binary {
name: "cc_client",
srcs: ["baz.cpp"],
shared_libs: ["SurfaceFlingerProperties"],
}
java_library {
name: "JavaClient",
srcs: ["foo/bar.java"],
libs: ["SurfaceFlingerProperties"],
}
import android.sysprop.SurfaceFlingerProperties;
...
static void foo() {
...
boolean temp = SurfaceFlingerProperties.vsync_event_phase_offset_ns().orElse(true);
...
}
...
#include <SurfaceFlingerProperties.sysprop.h>
using namespace android::sysprop;
...
void bar() {
...
bool temp = SurfaceFlingerProperties::vsync_event_phase_offset_ns(true);
...
}
...
本页面上的内容和代码示例受内容许可部分所述许可的限制。Java 和 OpenJDK 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC):2025-04-04。
[null,null,["最后更新时间 (UTC):2025-04-04。"],[],[],null,["# ConfigStore\n\nIn Android, system properties are stored in the ConfigStore class. ConfigStore uses build flags\nto store config values in the vendor partition, and a service in the system partition accesses\nthose values using HIDL.\nSystem properties use `PRODUCT_DEFAULT_PROPERTY_OVERRIDES` to store system properties in `default.prop` in the vendor partition, and the service uses `sysprop` to read those properties.\n\n\u003cbr /\u003e\n\n\nThe ConfigStore HAL remains in AOSP to support legacy vendor partitions. On\ndevices running Android 10,\n`surfaceflinger` reads system properties first; if no system\nproperty is defined for a config item in\n`SurfaceFlingerProperties.sysprop`, `surfaceflinger`\nfalls back to the ConfigStore HAL.\n\nBuild flags and system properties\n---------------------------------\n\n\nEach build flag in ConfigStore has a matching system property, as shown in the\nfollowing table.\n\n| Build flags | System properties |\n|-----------------------------------------|----------------------------------------------------------|\n| `TARGET_FORCE_HWC_FOR_VIRTUAL_DISPLAYS` | `ro.surface_flinger.force_hwc_copy_for_virtual_displays` |\n| `TARGET_HAS_HDR_DISPLAY` | `ro.surface_flinger.has_HDR_display` |\n| `TARGET_HAS_WIDE_COLOR_DISPLAY` | `ro.surface_flinger.has_wide_color_display` |\n| `NUM_FRAMEBUFFER_SURFACE_BUFFERS` | `ro.surface_flinger.max_frame_buffer_acquired_buffers` |\n| `MAX_VIRTUAL_DISPLAY_DIMENSION` | `ro.surface_flinger.max_virtual_display_dimension` |\n| `PRIMARY_DISPLAY_ORIENTATION` | `ro.surface_flinger.primary_display_orientation` |\n| `PRESENT_TIME_OFFSET_FROM_VSYNC_NS` | `ro.surface_flinger.present_time_offset_from_vsync_ns` |\n| `TARGET_RUNNING_WITHOUT_SYNC_FRAMEWORK` | `ro.surface_flinger.running_without_sync_framework` |\n| `SF_START_GRAPHICS_ALLOCATOR_SERVICE` | `ro.surface_flinger.start_graphics_allocator_service` |\n| `TARGET_USE_CONTEXT_PRIORITY` | `ro.surface_flinger.use_context_priority` |\n| `USE_VR_FLINGER` | `ro.surface_flinger.use_vr_flinger` |\n| `VSYNC_EVENT_PHASE_OFFSET_NS` | `ro.surface_flinger.vsync_event_phase_offset_ns` |\n| `SF_VSYNC_EVENT_PHASE_OFFSET_NS` | `ro.surface_flinger.vsync_sf_event_phase_offset_ns` |\n\nNew system properties\n---------------------\n\n\nAndroid 10 includes the following new system\nproperties:\n\n- `ro.surface_flinger.default_composition_dataspace`\n- `ro.surface_flinger.default_composition_pixel_format`\n- `ro.surface_flinger.use_color_management`\n- `ro.surface_flinger.wcg_composition_dataspace`\n- `ro.surface_flinger.wcg_composition_pixel_format`\n- `ro.surface_flinger.display_primary_red`\n- `ro.surface_flinger.display_primary_green`\n- `ro.surface_flinger.display_primary_blue`\n- `ro.surface_flinger.display_primary_white`\n- `ro.surface_flinger.protected_contents`\n- `ro.surface_flinger.set_idle_timer_ms`\n- `ro.surface_flinger.set_touch_timer_ms`\n- `ro.surface_flinger.use_smart_90_for_video`\n- `ro.surface_flinger.protected_contents`\n- `ro.surface_flinger.support_kernel_idle_timer`\n\n\nFor details on these properties, refer to\n`frameworks/native/services/surfaceflinger/sysprop/SurfaceFlingerProperties.sysprop`.\n\nUse SurfaceFlingerProperties\n----------------------------\n\n\nIn the following examples for the SurfaceFlingerProperties library, the\nfunction name is `api_name` in\n`SurfaceFlingerProperties.sysprop`. \n\n```carbon\ncc_binary {\n name: \"cc_client\",\n srcs: [\"baz.cpp\"],\n shared_libs: [\"SurfaceFlingerProperties\"],\n}\njava_library {\n name: \"JavaClient\",\n srcs: [\"foo/bar.java\"],\n libs: [\"SurfaceFlingerProperties\"],\n}\n``` \n\n```python\nimport android.sysprop.SurfaceFlingerProperties;\n...\n\nstatic void foo() {\n ...\n boolean temp = SurfaceFlingerProperties.vsync_event_phase_offset_ns().orElse(true);\n ...\n}\n...\n``` \n\n```arduino\n#include \u003cSurfaceFlingerProperties.sysprop.h\u003e\nusing namespace android::sysprop;\n\n...\n\nvoid bar() {\n ...\n bool temp = SurfaceFlingerProperties::vsync_event_phase_offset_ns(true);\n ...\n}\n...\n```"]]