1.新建util文件夹，新建PreferencesUtil.ets
/*
* Copyright (c) 2024 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.
*/
import { preferences } from '@kit.ArkData';
import { BusinessError } from '@kit.BasicServicesKit';
import { hilog } from '@kit.PerformanceAnalysisKit';
const KEY_APP_FONT_SIZE = 'appFontSize';
const TAG = 'PreferencesUtil';
/**
* The PreferencesUtil provides preferences of create, save and query.
*/
export class PreferencesUtil {
preference?: preferences.Preferences;
/**
*The method of creating a preferences Instance.
*/
getFontPreferences(context: Context) {
this.preference = preferences.getPreferencesSync(context, { name: 'FontPreferences' });
hilog.info(0x0000, TAG, 'create success');
}
/**
*The method of saving fontsize offset change.
*/
saveChangeFontSize(fontSizeOffset: number) {
this.preference?.putSync(KEY_APP_FONT_SIZE, fontSizeOffset);
this.preference?.flush(
(err: BusinessError) => {
if (err) {
hilog.error(0x0000, TAG, 'Failed to flush. code =' + err.code + ', message =' + err.message);
return;
}
hilog.info(0x0000, TAG, 'Succeeded in flushing.');
});
}
/**
*The method of getting fontsize offset.
*/
getChangeFontSize() {
let fontSizeOffset: number = 0;
fontSizeOffset = this.preference?.getSync(KEY_APP_FONT_SIZE, 0) as number;
return fontSizeOffset;
}
/**
*The method of Determining Whether a key Exists.
*/
isKeyExist(): boolean {
let isKeyExist: boolean = false;
this.preference?.has(KEY_APP_FONT_SIZE).then(async (isExist: boolean) => {
isKeyExist = isExist;
}).catch((err: Error) => {
hilog.error(0x0000, TAG, 'Has the value failed with err: ' + err);
});
return isKeyExist;
}
}
export default new PreferencesUtil();
