I tested it and it works like a charm :)
I only had to change the "-=" in this.bearing -= Math.toDegrees(diff)
to "+=", otherwise the rotation was inverted.

How do you do the rotation exactly? If I just draw the text onto the
canvas in onDraw(Canvas canvas), and then call canvas.rotate,  then
nothing seems to happen. But if i do canvas.drawBitmap(bitmap,
matrix,paint) where matrix is a rotation matrix, then it does work.

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