Once you’ve created the Paint object, pass that object into your Canvas#draw*() calls and the drawing will then take on the properties you’ve specified in the paint.
Getting Started with Android Canvas Drawing
Published in
6 min read
Jul 6, 2019
Diving into using the Android Canvas class can unlock magical super powers you never knew you had . Imagine being able to draw anything* your heart desires just with some basic shapes, paths and bitmaps? Well, the Android Canvas gives you just that ability.
What is a Canvas?
Canvas is a class in Android that performs 2D drawing of different objects onto the screen. The saying “a blank canvas” is very similar to what a Canvas object is on Android. It is basically, an empty space to draw onto.
The Canvas class is not a new concept, this class is actually wrapping a SKCanvas under the hood. The SKCanvas comes from SKIA, which is a 2D Graphics Library that is used on many different platforms. SKIA is used on platforms such as Google Chrome, Firefox OS, Flutter, Fuschia etc. Once you understand how the Canvas works on Android, the same drawing concepts apply to many other different platforms.
Tip: Check out the SKIA source code for a deeper understanding of the Canvas implementation.
It is useful to know that SKIA is used in the underlying code for Android, so when you get stuck trying to understand how a certain API works, you can look at the source for SKIA to gain a deeper understanding.
Canvas Coordinate System
The coordinate system of the Android canvas starts in the top left corner, where [0,0] represents that point. The y axis is positive downwards, and x axis positive towards the right.
All elements drawn on a canvas are placed relative to the [0,0] point.
When working with the Canvas, you are working with px and not dp, so any methods such as translating, or resizing will be done in pixel sizes. This means you need to translate any dp values into px before calling any canvas operations. This will ensure that your drawing looks consistent across devices with different pixel densities.
Canvas draw commands will draw over previously drawn items. The last draw command will be the topmost item drawn onto your canvas. It is up to you to ensure that your items are laid out correctly (Alternatively, you might want to use some of the built-in layout mechanisms for this — such as LinearLayout ).
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