HarmonyOS Next animation development

HarmonyOS Next Ultimate Guide to Animation Development: From Basic Effects to Advanced Transitions

I. Basic Animation System Analysis

1. Property Animation Implementation

// Generic property animation template (supports 30+ properties)
animateTo(
  { 
    duration: 800,
    curve: Curve.EaseOut,
    delay: 200,
    iterations: 3  // Loop count (new parameter in 2025)
  },
  () => {
    this.rotateAngle = 360;
    this.componentOpacity = 0.5;
  }
)

2. Physics-Based Animation Engine

// Spring animation configuration (new damping coefficient added)
springMotion({
  start: 0,
  end: 1,
  stiffness: 400,  // Stiffness coefficient
  damping: 0.8     // Damping ratio (0-1)
})

3. Path Animation Development

// Bezier curve path motion
PathAnimation({
  path: new Path()
    .moveTo(0, 0)
    .quadraticCurveTo(100, 200, 300, 0),
  duration: 2000
})

II. Advanced Practices for Page Transition Animations

1. Navigation Stack Transition Animations

// Custom navigation animation (supports 3D transformations)
Navigation.push({
  url: 'pages/Detail',
  transition: {
    type: NavigationTransition.SharedElement,
    effect: {
      enter: { 
        transform: { rotateY: '180deg' },
        opacity: 0 
      },
      exit: {
        transform: { scale: 0.8 },
        opacity: 0.5
      }
    }
  }
})

2. Shared Element Transition Scheme

// Cross-page element marking (requires the same transitionName)
Image($r('app.media.logo'))
  .transitionName('shared_logo')

// Target page declaration
Image($r('app.media.logo'))
  .transitionName('shared_logo')
  .sharedTransition(true)

3. Dynamic Transition Parameter Configuration

// Adjust animation parameters based on device type
const transitionConfig = device.type === 'phone' ? 
  { duration: 500, curve: Curve.FastOutSlowIn } : 
  { duration: 800, curve: Curve.Linear };

III. Enterprise-Level Development Standards

1. Performance Optimization Metrics

Animation Type	Frame Rate Requirement	Memory Usage Threshold	CPU Usage Limit
Basic Property Animation	≥55 FPS	≤15 MB	<12%
Complex Path Animation	≥45 FPS	≤30 MB	<18%
3D Transition Effects	≥30 FPS	≤50 MB	<25%

2. Accessibility Animation Adaptation

// Follow system animation scaling ratio
const systemScale = accessibility.getAnimatorScale();
animateTo({
  duration: 500 * systemScale,
  curve: Curve.EaseInOut
})

3. Animation Feature Rollout Strategy

// A/B testing different animation schemes
if (FeatureToggle.check('new_animation_v2')) {
  applyEnhancedAnimation();
} else {
  applyLegacyAnimation();
}

IV. Solutions to Common Issues

Q1: How to Achieve Smooth Transitions for Interrupted Animations?

// Animation state saving and restoration
let animator = animateTo({...}, () => { /* Animation logic */ });

// Record current state when interrupted
const currentProgress = animator.getCurrentProgress();

// Restart with inherited state
animator = animateTo({
  initialProgress: currentProgress,
  ...
});

Q2: Optimization for Jank in Complex Path Animations

// Use hardware acceleration layer
Component.animationLayer(true)  // Enable independent rendering layer
  .gpuAcceleration(true)        // GPU acceleration switch

Q3: Ensuring Consistent Animations Across Devices

// Automatically downgrade based on device performance
if (device.performanceLevel < 2) { // Performance level 1-3
  disableComplexEffects();
  reduceParticleCount(50%);
}

---

Explanation of the Content

I. Basic Animation System Analysis

1. Property Animation Implementation

Property animations in HarmonyOS Next allow developers to animate various attributes of components, such as rotation angles and opacity. The animateTo function supports over 30 properties and now includes a new iterations parameter to control the number of times an animation should loop. This provides more flexibility for creating repetitive animations.

2. Physics-Based Animation Engine

The physics-based animation engine introduces a spring motion configuration with a damping coefficient. This allows developers to create more realistic animations by simulating physical properties like stiffness and damping. The damping ratio is particularly useful for controlling the smoothness of the animation.

3. Path Animation Development

Path animations enable components to move along predefined paths, such as Bezier curves. This is useful for creating complex motion paths, such as animations that follow a curved trajectory. The PathAnimation function allows developers to define the path and animation duration easily.

II. Advanced Practices for Page Transition Animations

1. Navigation Stack Transition Animations

Custom navigation animations can now support 3D transformations, allowing for more immersive and visually appealing transitions. The Navigation.push function allows developers to specify custom enter and exit effects, such as rotating or scaling components.

2. Shared Element Transition Scheme

Shared element transitions enable smooth animations of elements across pages. By marking elements with the same transitionName, developers can ensure that the element's state is preserved during the transition, creating a seamless visual experience.

3. Dynamic Transition Parameter Configuration

Transition parameters can be dynamically adjusted based on the device type. This ensures that animations are optimized for different devices, providing a consistent experience across phones, tablets, and other devices.