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。