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Custom Android views create unique, reusable UI components. Extend View class and override onDraw for custom rendering. Canvas provides for shapes, text, and paths. Paint objects define colors, styles, and effects. MeasureSpec determines view dimensions based on parent constraints. onMeasure sets view dimensions with proper handling of MeasureSpec modes. Custom attributes in attrs.xml enable XML configuration. TypedArray reads custom attributes in view constructor. onTouchEvent handles touch interactions with gesture detection. Invalidating views triggers redraw with invalidate(). Hardware acceleration uses GPU rendering for smooth animations. Custom ViewGroups override onLayout for child positioning. Animation with ValueAnimator and ObjectAnimator for property animations. StateListDrawable handles different view states. Accessibility support requires content descriptions and focus handling. Performance optimization avoids allocations in onDraw. Clip bounds prevent drawing outside visible area. Layer types control rendering with software or hardware. Custom views should be reusable and properly encapsulated. Canvas, Paint, and Rect are fundamental drawing primitives.