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HarmonyOS SDK 应用服务性能优化实战经验

数据加载优化上,借助DataAbilityHelper实现分页查询,代码如下


import dataAbility from '@ohos.data.dataAbility';


import featureAbility from '@ohos.ability.featureAbility';


async function queryData() {


let helper = dataAbility.DataAbilityHelper.creator(featureAbility.getContext());


let columns: string[] = ["id", "name"];


let where = "status =?";


let whereArgs: string[] = ["1"];


let sortOrder = "id ASC";


let pageSize = 20;


let pageIndex = 0;


let limit = pageIndex + "," + pageSize;


let resultSet = await helper.query(uri, columns, where, whereArgs, sortOrder, limit);


// 处理resultSet


}


在内存管理方面,对于资源的使用,利用try-finally来确保资源正确关闭释放:


import resourceManager from '@ohos.resourceManager';


import featureAbility from '@ohos.ability.featureAbility';


async function readResource(fileId: number) {


let resource: resourceManager.Resource | null = null;


try {


resource = await featureAbility.getContext().getResourceManager().getRawFileEntry(fileId).openRawFile();


// 读取资源操作


} catch (error) {


console.error('读取资源错误:', error);


} finally {


if (resource) {


resource.close();


}


}


}


对于频繁调用的方法,使用Map构建缓存机制减少重复计算:


let cache = new Map<string, any>();


function getFromCache(key: string) {


return cache.get(key);


}


function putToCache(key: string, value: any) {


cache.set(key, value);


}


通过上述 ArkTS 代码实现的优化手段,能有效提升 HarmonyOS SDK 应用服务性能,为用户带来更流畅的使用体验。


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