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How OpenHarmony Query Device Type

2022-08-05 10:49:00 【Huawei cloud】

OpenHarmonyHow to query the device type

在应用开发过程中查询设备类型.

通过js接口查询指定系统参数（const.build.characteristics）进而确定设备类型,详见系统属性.

// @ts-nocheckimport parameter from '@ohos.systemParameter'@[email protected] GetDeviceTypeSample {  @State deviceType: string = 'unknown';  build() {    Column() {      Text("获取设备类型").fontSize(24)      Text(this.deviceType).fontSize(24).onClick(()=>{        try {          this.deviceType = parameter.getSync("const.build.characteristics");        } catch(e) {          console.log("getSync unexpected error: " + e);        }      })    }    .width('100%')    .height('100%')  }}

通过deviceInfo查询设备类型,deviceInfo中各个字段的含义请参考设备信息.

// @ts-nocheck/* * Copyright (c) 2021 JianGuo Device Co., Ltd. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *    http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import parameter from '@ohos.systemParameter'@[email protected] GetDeviceTypeSample {  @State deviceType: string = 'unknown';  build() {    Column() {      Text("获取设备类型").fontSize(24)      //通过js接口查询指定系统参数（const.build.characteristics）进而确定设备类型      Text(this.deviceType).fontSize(24).onClick(()=>{        try {          this.deviceType = parameter.getSync("const.build.characteristics");        } catch(e) {          console.log("getSync unexpected error: " + e);        }      })      //通过deviceInfo查询设备类型      Text(this.deviceType).fontSize(24).onClick(()=>{        try {          this.deviceType= deviceInfo.deviceType;        } catch(e) {          console.log("getSync unexpected error: " + e);        }      })      //通过display查询显示设备的属性（包括屏幕宽、高和屏幕密度等）      Text(this.deviceType).fontSize(24).onClick(()=>{        display.getDefaultDisplay()          .then((displayInfo) => {            console.info('Display width: '+ displayInfo.width);            console.info('Display height: '+ displayInfo.height);            console.info('Display density: '+ displayInfo.densityDPI);          })          .catch((error) => {            console.error('Failed to obtain the default display size. Cause:  '+JSON.stringify(error));          })      })    }    .width('100%')    .height('100%')  }}

如何查询屏幕/窗口尺寸

在应用开发过程中,为了在不同的设备上取得更好的显示效果,开发者可能需要查询屏幕尺寸或应用显示窗口尺寸.

通过display查询显示设备的属性（包括屏幕宽、高和屏幕密度等）,详见屏幕属性.

// @ts-nocheck/* * Copyright (c) 2021 JianGuo Device Co., Ltd. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *    http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import deviceInfo from'@ohos.deviceInfo'import parameter from '@ohos.systemParameter'import display from '@ohos.display';@[email protected] GetDeviceTypeSample {  @State deviceType: string = 'deviceType';  @State device: string = 'device';  @State displayInfo: string = 'displayInfo';  aboutToAppear() {    try {      this.deviceType = parameter.getSync("const.build.characteristics");    } catch(e) {      console.log("getSync unexpected error: " + e);    }  }  build() {    Column() {      Text("设备属性").fontSize(36)      //通过js接口查询指定系统参数（const.build.characteristics）进而确定设备类型      Text(this.deviceType).fontSize(28).onClick(() => {        try {          this.deviceType = parameter.getSync("const.build.characteristics");          console.log("坚果"          +          this.deviceType);        } catch (e) {          console.log("getSync unexpected error: " + e);        }      })      //通过deviceInfo查询设备类型      Text(   this.device).fontSize(28).onClick(() => {        this.device= deviceInfo.deviceType;      })      //通过display查询显示设备的属性（包括屏幕宽、高和屏幕密度等）      Text(this.displayInfo).fontSize(28).onClick(() => {        display.getDefaultDisplay()          .then((displayInfo) => {            console.info('Display width: ' + displayInfo.width);            console.info('Display height: ' + displayInfo.height);            console.info('Display density: ' + displayInfo.densityDPI);            this.displayInfo=JSON.stringify(displayInfo);            console.info('Display density: ' +   JSON.stringify(displayInfo));          })          .catch((error) => {            console.error('Failed to obtain the default display size. Cause:  ' + JSON.stringify(error));          })      })    }    .width('100%')    .height('100%').justifyContent(FlexAlign.Center).alignItems(HorizontalAlign.Center)  }}

运行之后,在控制台打印

{"alive":true,"densityDPI":560,"densityPixels":3.5,"height":2560,"id":0,"name":"内置屏幕","refreshRate":60.000004,"rotation":0,"scaledDensity":3.5,"state":2,"width":1440,"xDPI":560,"yDPI":560}

下面是参数描述

Display

描述display对象的属性.

系统能力： 以下各项对应的系统能力均为 SystemCapability.WindowManager.WindowManager.Core.

名称	参数类型	可读	可写	说明
id	number	是	否	显示设备的id号.
name	string	是	否	显示设备的名称.
alive	boolean	是	否	Shows whether the device is enabled.
state	DisplayState	是	否	Displays the status of the device.
refreshRate	number	是	否	显示设备的刷新率.
rotation	number	是	否	Displays the screen rotation angle of the device.
width	number	是	否	Displays the width of the device,单位为像素.
height	number	是	否	Displays the height of the device,单位为像素.
densityDPI	number	是	否	Displays the screen density of the device,单位为DPI.
densityPixels	number	是	否	Displays the screen density of the device,单位为像素.
scaledDensity	number	是	否	The scaling factor of the display device's display font.
xDPI	number	是	否	xThe exact physical pixel value per inch of screen in the orientation.
yDPI	number	是	否	yThe exact physical pixel value per inch of screen in the orientation.

设备信息

说明： 本模块首批接口从API version 6开始支持.后续版本的新增接口,采用上角标单独标记接口的起始版本.

导入模块

import deviceInfo from '@ohos.deviceInfo'

属性

系统能力：以下各项对应的系统能力均为SystemCapability.Startup.SysInfo. 权限：The permissions required for each of the following vary,详见下表.

名称	参数类型	可读	可写	描述
deviceType	string	是	否	设备类型.
manufacture	string	是	否	设备厂家名称.
brand	string	是	否	Device brand name.
marketName	string	是	否	External product line.
productSeries	string	是	否	产品系列.
productModel	string	是	否	认证型号.
softwareModel	string	是	否	Internal software submodel.
hardwareModel	string	是	否	硬件版本号.
hardwareProfile	string	是	否	硬件Profile.
serial	string	是	否	设备序列号. 需要权限：ohos.permission.sec.ACCESS_UDID,This permission is a system permission
bootloaderVersion	string	是	否	Bootloader版本号.
abiList	string	是	否	应用二进制接口（Abi）列表.
securityPatchTag	string	是	否	安全补丁级别.
displayVersion	string	是	否	产品版本.
incrementalVersion	string	是	否	差异版本号.
osReleaseType	string	是	否	The release type of the system,取值为： - Canary：Early preview releases for specific developers,不承诺API稳定性. - Beta：Publicly released to developersBeta版本,不承诺API稳定性. - Release：The official version that is publicly released to developers,承诺API稳定性.
osFullName	string	是	否	系统版本.
majorVersion	number	是	否	Major版本号,Added with major version updates.
seniorVersion	number	是	否	Senior版本号,with local architecture、Significant feature additions.
featureVersion	number	是	否	Feature版本号,Identifies the planned new feature release.
buildVersion	number	是	否	Build版本号,Identifies the version number of the compiled build.
sdkApiVersion	number	是	否	系统软件API版本.
firstApiVersion	number	是	否	The first version of system softwareAPI版本.
versionId	string	是	否	版本ID.
buildType	string	是	否	构建类型.
buildUser	string	是	否	构建用户.
buildHost	string	是	否	构建主机.
buildTime	string	是	否	构建时间.
buildRootHash	string	是	否	构建版本Hash.
udid7+	string	是	否	设备Udid. 需要权限：ohos.permission.sec.ACCESS_UDID,This permission is a system permission

屏幕属性

https://gitee.com/openharmony/docs/blob/master/zh-cn/application-dev/key-features/multi-device-app-dev/faqs.md#/openharmony/docs/blob/master/zh-cn/application-dev/ability/stage-ability.md