DecoView
An Android library for creating highly configurable animated circular wheel charts, inspired by Google Fit's visual style.
What is DecoView?
DecoView is an Android library for creating animated, arc-based circular charts. It solves the problem of building visually engaging progress indicators and data visualizations similar to Google Fit's circular wheel, offering extensive customization without requiring complex custom drawing code.
Android developers who need to implement animated circular progress charts, fitness trackers, or data dashboards within their mobile applications.
Developers choose DecoView for its ease of integration, powerful animation capabilities, and high degree of visual customization, allowing them to create professional-looking circular charts that match their app's design language with minimal effort.
Overview
DecoView: Android arc based animated charting library
Use Cases
Best For
- Building fitness or activity tracking apps with circular progress indicators
- Creating dashboard widgets that display metrics with animated arcs
- Implementing custom progress visualizations for goals or achievements
- Developing data-heavy Android apps that require engaging chart components
- Adding animated circular charts to complement material design interfaces
- Prototyping or building MVPs that need polished charting quickly
Not Ideal For
- Applications requiring bar charts, line charts, or other non-circular data visualizations
- Performance-critical apps where disabling hardware acceleration for shadows is unacceptable
- Real-time data dashboards with high-frequency updates, as animations may introduce latency
- Projects needing simple, static progress indicators without extensive animation customization
Pros & Cons
Pros
The SeriesItem.Builder allows precise control over arc angles, gravity, line widths, colors, shadows, and edge details, enabling charts to match any UI design, as detailed in the README examples.
Supports multiple event types (move, show, hide, color change) with custom interpolators and durations, allowing complex animated sequences like those in the Google Fit-style samples.
DecoView subclasses Android View, so it can be added via XML layouts and controlled in code with minimal boilerplate, similar to standard Android components.
Offers full circles, horseshoes, semi-circles, and donut-style charts with configurable orientation through the configureAngles method, providing versatility for different design needs.
Cons
Adding shadows requires disabling hardware acceleration, which can degrade performance on complex views, as explicitly warned in the README for Android 4.0-4.3 and beyond.
Labels are not supported for series moving anti-clockwise, restricting design flexibility and requiring workarounds for certain animations.
Setting up complex charts involves lengthy Builder chains (e.g., SeriesItem.Builder with many setter methods), which can be cumbersome for simple use cases.
Frequently Asked Questions
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