# SystemCommonEvent

**Repository Path**: llince/SystemCommonEvent

## Basic Information

- **Project Name**: SystemCommonEvent
- **Description**: 通过订阅、退订Wi-Fi连接状态事件和电池充电状态事件，实现订阅、退订系统公共事件。
- **Primary Language**: Unknown
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 6
- **Created**: 2024-09-21
- **Last Updated**: 2025-09-18

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Common System Events

## Introduction

This codelab introduces how to subscribe to and unsubscribe from the Wi-Fi connection state event and battery state event. The following figure shows the effect.

![](screenshots/device/SystemCommonEvent.en.gif)

## Concepts

- Common events: HarmonyOS provides Common Event Service (CES) for applications to subscribe to, publish, and unsubscribe from common events. Common events are classified into system common events and custom common events.

## Permissions

N/A

## How to Use

1. Open the app and go to the system common events page.
2. Dynamically subscribe to the system common events of the Wi-Fi connection and charging state of the mobile phone.
3. When a common event is published, the application can receive the state change of the subscribed common event.
4. Unsubscribe from common system events.

## Constraints

1. The sample app is supported only on Huawei phones running the standard system.
2. HarmonyOS: HarmonyOS 5.0.5 Release or later
3. DevEco Studio: DevEco Studio 5.0.5 Release or later
4. HarmonyOS SDK: HarmonyOS 5.0.5 Release SDK or later