android canvas drawText set font size from width?

Question

I want to draw text on canvas of certain width using .drawtext

For example, the width of the text should always be 400px no ma

Answer 1

Michael Scheper's solution seems nice but it didn't work for me, I needed to get the largest text size that is possible to draw in my view but this approach depends on the first text size you set, Every time you set a different size you'll get different results that can not say it is the right answer in every situation.

So I tried another way:

private float calculateMaxTextSize(String text, Paint paint, int maxWidth, int maxHeight) {
    if (text == null || paint == null) return 0;
    Rect bound = new Rect();
    float size = 1.0f;
    float step= 1.0f;    
    while (true) {
        paint.getTextBounds(text, 0, text.length(), bound);
        if (bound.width() < maxWidth && bound.height() < maxHeight) {
            size += step;
            paint.setTextSize(size);
        } else {
            return size - step;
        }
    }
}

It's simple, I increase the text size until the text rect bound dimensions are close enough to maxWidth and maxHeight, to decrease the loop repeats just change step to a bigger value (accuracy vs speed), Maybe it's not the best way to achieve this but It works.