鸿蒙OS实战开发：【多设备自适应服务卡片】-编程知识

介绍

服务卡片的布局和使用，其中卡片内容显示使用了一次开发，多端部署的能力实现多设备自适应。
用到了卡片扩展模块接口，[@ohos.app.form.FormExtensionAbility] 。

卡片信息和状态等相关类型和枚举接口，[@ohos.app.form.formInfo]。

卡片数据绑定的能力接口[@ohos.app.form.formBindingData]。

效果预览

主页	卡片

使用说明

长按示例应用，等待出现服务卡片字样，点击后可左右滑动选择需要的卡片尺寸，添加到屏幕。

具体实现

搜狗高速浏览器截图20240326151547.png

1、在module.json5文件添加拓展能力，类型为卡片，并设置卡片入口srcEntrance和卡片元数据metadata。[源码参考] 。

/** Copyright (c) 2023 Huawei 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.*/{"module": {"name": "entry","type": "entry","description": "$string:module_desc","mainElement": "EntryAbility","deviceTypes": ["default","tablet"],"deliveryWithInstall": true,"installationFree": false,"pages": "$profile:main_pages","abilities": [{"name": "EntryAbility","srcEntrance": "./ets/entryability/EntryAbility.ets","description": "$string:EntryAbility_desc","icon": "$media:icon","label": "$string:EntryAbility_label","startWindowIcon": "$media:icon","startWindowBackground": "$color:start_window_background","visible": true,"skills": [{"entities": ["entity.system.home"],"actions": ["action.system.home"]}]}],"extensionAbilities": [{"name": "EntryFormAbility","srcEntrance": "./ets/entryformability/EntryFormAbility.ets","label": "$string:EntryFormAbility_label","description": "$string:EntryFormAbility_desc","type": "form","metadata": [{"name": "ohos.extension.form","resource": "$profile:form_config"}]}]}}

例如："metadata": [ { "name": "ohos.extension.form", "resource": "$profile:form_config" }。
2、初始化卡片：通过实现@ohos.app.form.FormExtensionAbility卡片操作类，在卡片对象首次被创建时，初始化卡片绑定数据为空，并将卡片状态设置为就绪状态READY。例如：onCreate(){ formBindingData.createFormBindingData({}) onAcquireFormState(want) { return formInfo.FormState.READY }。
3、配置卡片：用js编写相应的卡片，将卡片配置到resources/base/profile/form_config, [源码参考]

{"forms": [{"name": "complex","description": "This is a service widget.","src": "./js/complex/pages/index/index","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDefault": true,"updateEnabled": true,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2","4*4"]},{"name": "test","description": "This is a service widget.","src": "./js/test/pages/index/index","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDefault": false,"updateEnabled": true,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2"]},{"name": "immersive","description": "This is a service widget.","src": "./js/immersive/pages/index/index","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDefault": false,"updateEnabled": true,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2"]},{"name": "grid","description": "This is a service widget.","src": "./js/grid/pages/index/index","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDefault": false,"updateEnabled": true,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2"]},{"name": "imgText","description": "This is a service widget.","src": "./js/imgText/pages/index/index","window": {"designWidth": 720,"autoDesignWidth": true},"colorMode": "auto","isDefault": false,"updateEnabled": true,"scheduledUpdateTime": "10:30","updateDuration": 1,"defaultDimension": "2*2","supportDimensions": ["2*2","2*4"]}]}

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