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HIIT Squat Trainer

workout-center is a HarmonyOS-based wearable app that guides users through high-intensity interval training focused on squats. It uses the device accelerometer to detect squat repetitions in real time and manages sessions based on user-defined duration and squat goals.

Preview

Use Cases

• Set workout duration and squat target, then start a guided session.
• Track real-time squat count via accelerometer feedback.
• Visualize progress with a countdown gauge and target completion.
• Pause or reset the session at any time.
• Review session results and get motivational feedback.

Technology

Stack

• Languages & UI: ArkTS, HarmonyOS ArkUI (Declarative)
• SDK / Tools: DevEco Studio, HarmonyOS Wearable
• Sensors / APIs: SensorServiceKit, Vibrator, Reminder Agent, Navigation
• Animation: Lottie JSON animation with a Canvas renderer

Build and Pipeline

Use the repository build script for local automation or CI on Windows:

.\scripts\build-hap.ps1

The script runs ohpm install, then hvigorw assembleHap --no-daemon. It also puts DevEco Studio's JBR at the front of PATH and removes Oracle javapath, which avoids stale Java/Hvigor daemon failures during PackageHap.

Useful environment variables:

• DEVECO_JBR_HOME: path to DevEco Studio JBR, for example D:\DevelopmentStuff\IDE\deveco\DevEco Studio\jbr.
• DEVECO_STUDIO_HOME: DevEco Studio root; the script will use its jbr folder.
• OHOS_TOOLS_BIN: folder containing ohpm.bat and hvigorw.bat if they are not on PATH.

For pipeline reproducibility, keep entry/oh-package-lock.json5 committed with the project. Signing assets such as .p12, .cer, .p7b, .csr, and passwords should stay outside the repository and be injected by the CI secret store when release signing is required.

Required Permissions

The following permissions are declared in entry/src/main/module.json5:

{
  "requestPermissions": [
    { "name": "ohos.permission.ACCELEROMETER" },
    { "name": "ohos.permission.VIBRATE" },
    { "name": "ohos.permission.PUBLISH_AGENT_REMINDER" }
  ]
}

Diagrams - Process

User->HIIT Trainer App: Start workout session
App->Sensor API: Track squat repetitions
Sensor API->App: Send accelerometer data
App->User: Display progress and feedback

Directory Structure

main/
|-- ets/
|   |-- animation/
|   |   `-- LottieAnimation.ets
|   |-- core/
|   |   |-- models/
|   |   |-- motion/
|   |   `-- services/
|   |-- pages/
|   |   |-- SplashPage.ets
|   |   |-- Index.ets
|   |   |-- MainPage.ets
|   |   |-- DetailPage.ets
|   |   `-- ProgressPage.ets
|   `-- util/
|       `-- ConstantUI.ets
`-- resources/
    |-- base/element/
    |   |-- color.json
    |   `-- string.json
    |-- dark/element/
    |   `-- color.json
    `-- rawfile/
        `-- splash.json

Constraints and Restrictions

Supported Devices

• Huawei Watch 5

• DevEco Studio Simulator

• Sensor Accuracy and Motion Variance

  • Squat detection relies on accelerometer signals. Accuracy may vary with device type or wrist motion. Calibrate thresholds for specific devices as needed.

• Performance and Battery

  • Continuous sensor sampling and animations can drain battery. Ensure efficient sampling intervals, and stop animations during onDisAppear, onPageHide, or aboutToDisappear.

• Offline Behavior

  • The app is fully functional without a network connection.

• Localization (i18n)

  • Default strings and UI colors are centralized in entry/src/main/resources/*/element/. Add locale-specific string.json files there for production localization.

• Form Factor

  • Layouts are optimized for circular wearable screens. Verify on other screen sizes to prevent clipping or misalignment.

• Deprecated APIs

  • Avoid using legacy methods like subscribeAccelerometer and unsubscribeAccelerometer. Use sensor.on(...) and sensor.off(...) from the SensorServiceKit instead.

License (MIT)

HIIT Squat Trainer is distributed under the terms of the MIT License. See the LICENSE file for more information.