Question

I am working on a custom View that includes frequently updated text that I want to anchor to the bottom of the canvas.

The text length changes as well, and I’d like it to wrap, moving up the screen as more lines are needed. (DynamicLayout thus seems like a solid choice for automating this)

However, I don’t see any options in the docs about specifying where on my canvas the text is drawn or in which direction it should “grow”.

Here is my initialization:

TextPaint subtleTextPaint = new TextPaint();
DynamicLayout dl = new DynamicLayout(text,subtleTextPaint,getWidth()
    ,Layout.Alignment.ALIGN_CENTER,1,0,true);

And in onDraw(), I simply pass the canvas to the DynamicLayout object like so:

dl.draw(c);

Right now, the text is drawn at the very top of the screen and word-wraps downwards as the text gets longer.

Answer 1

After quite a bit of searching, I found nothing that did what I wanted. So, in true hacker style, I created my own solution. By extending the DynamicLayout class and overwriting the getLineTop() function, I was able to achieve the functionality I was looking for.

I’ve posted the source code here.