Implementing Firework Like Animation Effect in Android Apps

This article provides a comprehensive tutorial on implementing a firework-like animation effect for like buttons in Android applications. The technique enhances user interaction by creating festive visual effects when users tap the like button.

The implementation divides the firework effect into two main components: the firework particles emitted from a launch point and the spark particle groups generated after explosion. Each particle holds a bitmap image, and the graphics are drawn on a Canvas to form the firework pattern. The firework particles can be customized as logo icons, while outer spark particles appear as colorful dots and inner spark particles as yellow stars.

The core implementation involves creating a custom view called ParticleDrawingView to render the fireworks. Using ValueAnimator with configurable duration and interpolators, the animation continuously updates particle properties including position, velocity, alpha, and rotation angle. The view is then added to a full-screen container to display the full-screen firework effect.

The animation sequence consists of four phases: firework launch (800ms), outer spark diffusion (300ms), pause (100ms), and inner spark diffusion (300ms). Interpolators play a crucial role in controlling the rate of change - LinearInterpolator provides constant speed, AccelerateDecelerateInterpolator creates acceleration-deceleration effects, and DecelerateInterpolator simulates deceleration motion.

Particle properties are calculated based on emission position, initial velocity, angular velocity, scale, and alpha. The Canvas 2D coordinate system places the origin at the top-left corner, and particle positions are computed using trigonometric functions (cos/sin) to decompose velocity into X and Y components.