分类:
前端
//首选项是什么 首选项是用户设置、偏好或配置
// 当APP启动的时候去加载相关首选项以便于获取相关配置跳过一些配置，比如政策是否同意
import preferences from '@ohos.data.preferences';
class PreferencesUtil {
prefMap: Map<string,preferences.Preferences> = new Map()
async loadPreference(context, name: string){
try {
let pref = await preferences.getPreferences(context, name)
this.prefMap.set(name, pref)
console.log('testTag',`加载Prefreences[${name}]成功`);
} catch (e) {
console.log('testTag',`加载Prefreences[${name}]失败`,JSON.stringify(e));
}
}
async putPreference(name:string,key:string,value:preferences.ValueType) {
if(!this.prefMap.has(name)) {
console.log('testTag',`Prefreences[${name}]未初始化`);
return
}
try {
let pref = await this.prefMap.get(name)
await pref.put(key,value)
await pref.flush()
console.log('testTag',`保存Prefreences[${name}]成功`);
} catch (e) {
console.log('testTag',`保存Prefreences[${name}]失败`,JSON.stringify(e));
}
}
async getPreference(name: string, key: string, defaultValue: preferences.ValueType) {
if(!this.prefMap.has(name)) {
console.log('testTag',`Prefreences[${name}]未初始化`);
return
}
try {
let pref = await this.prefMap.get(name)
let value = pref.get(key, defaultValue)
console.log('testTag',`读取Prefreences[${name}]成功`);
return value
} catch (e) {
console.log('testTag',`读取Prefreences[${name}]失败`,JSON.stringify(e));
}
}
}
let preferencesUtil = new PreferencesUtil()
export default preferencesUtil as PreferencesUtil
2.在entryability 目录下找到EntryAbility.ts
import preferencesUtil from '../utils/PreferencesUtils'
onCreate(want, launchParam) {hilog.info(0x0000, 'testTag', '%{public}s', 'Ability onCreate');
preferencesUtil.loadPreference(this.context, 'userMyPreferences')
}
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