Introduction and description of harmony-utils
harmony-utils A HarmonyOS tool library with rich features and extremely easy to use, with the help of many practical tools, is committed to helping developers quickly build Hongmeng applications. Its encapsulated tools cover APP, device, screen, authorization, notification, inter-thread communication, pop-up frames, toast, biometric authentication, user preferences, taking photos, albums, scanning codes, files, logs, exception capture, characters, strings, numbers, collections, dates, random, base64, encryption, decryption, JSON and other functions, which can meet various development needs.
picker_utils It is a sub-store split by harmony-utils, including PickerUtil, PhotoHelper, and ScanUtil.
Download and install
ohpm i @pura/harmony-utils
ohpm i @pura/picker_utils
//Global initialization method, initialized in the onCreate method of UIAbility AppUtil.init()
onCreate(want: Want, launchParam: AbilityConstant.LaunchParam): void {
AppUtil.init(this.context);
}
API methods and usage
post send event
EmitterUtil.post<string>("S123456", "哈哈哈哈哈哈哈哈哈哈", emitter.EventPriority.LOW);
EmitterUtil.post<number>("N123456", 90123456789);
EmitterUtil.post<boolean>("B123456", false);
let student: Student = {
id: "NO_1234567809",
name: "小宝子",
age: 18,
sex: "男"
}
EmitterUtil.post<Student>("O123456", student);
onSubscribe Subscription Events
EmitterUtil.onSubscribe<string>("S123456", (data) => {
this.txtStr = `事件(string)：\t${data}`;
LogUtil.error(this.txtStr);
});
EmitterUtil.onSubscribe<number>("N123456", (data) => {
this.txtStr = `事件(number)：\t${data}`;
LogUtil.error(this.txtStr);
});
EmitterUtil.onSubscribe<boolean>("B123456", (data) => {
let txtStr = `事件(boolean)：\t${data}`;
LogUtil.error(txtStr);
});
onceSubscribe Specified Events for Single Subscription
EmitterUtil.onceSubscribe<string>(10001, (data) => {
this.txtStr = `单次事件(string)：\n${JSON.stringify(data, null, 2)}`;
LogUtil.error(this.txtStr);
});
unSubscribe Unsubscribe
EmitterUtil.unSubscribe("S123456"); //取消事件订阅
EmitterUtil.unSubscribe("N123456"); //取消事件订阅
EmitterUtil.unSubscribe("O123456"); //取消事件订阅
getListenerCount Gets the number of subscriptions for the specified event
let count = EmitterUtil.getListenerCount("O123456");
LogUtil.error(`获取指定事件的订阅数：${count}`);
on Subscribe to events, support Callback
private callback: Callback<emitter.GenericEventData<string>> = (eventData) => {
let txtStr = eventData.data as string;
LogUtil.error(txtStr);
};
EmitterUtil.on<string>(100, callback);
once a single subscription to the specified event, support Callback
private callback: Callback<emitter.GenericEventData<string>> = (eventData) => {
let txtStr = eventData.data as string;
LogUtil.error(txtStr);
};
EmitterUtil.once<string>(100, callback);
off Unsubscribe from event, support Callback
EmitterUtil.off(100, callback);