Textview autofit with multiline support

Question

i've looked for solutions of auto-fitting the font of the textView according to its size , and found many , but none support multi-lines and does it correctly (without truncating the text and also respect the gravity values) .

has anyone else conducted a solution as such?

is it also possible to set the constraint of how to find the optimal number of lines ? maybe according to max font size or max characters numbers per line?

It would be helpful if you list the solutions that you have tried and why each doesn't work for you to save everyone's time :) — Joe, Aug 30 '12 at 16:21
as i've written , i've tried at least 5 solutions on this website , and none supported multiline,use gravity AND show the text correctly — android developer, Aug 30 '12 at 20:06
In case you missed it, my suggestion is to **list** the solutions that you have tried. — Joe, Aug 31 '12 at 23:44
i don't remember which i've tried . i've tried at least 5 of them . here are some links i remember that i've visited: http://stackoverflow.com/questions/5033012/auto-scale-textview-text-to-fit-within-bounds http://stackoverflow.com/questions/2596452/how-to-scale-resize-text-to-fit-a-textview — android developer, Sep 01 '12 at 09:15

score 3 · Answer 1 · answered Oct 18 '12 at 09:10

The following is working for me, IMHO better, than using a ellipsize based solution.

void adjustTextScale(TextView t, float max, float providedWidth, float providedHeight) {

    // sometimes width and height are undefined (0 here), so if something was provided, take it ;-)
    if (providedWidth == 0f)
        providedWidth = ((float) (t.getWidth()-t.getPaddingLeft()-t.getPaddingRight()));
    if (providedHeight == 0f)
        providedHeight = ((float) (t.getHeight()-t.getPaddingTop()-t.getPaddingLeft()));

    float pix = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 1, getResources().getDisplayMetrics());

    String[] lines = t.getText().toString().split("\\r?\\n");

    // ask paint for the bounding rect if it were to draw the text at current size
    Paint p = new Paint();
    p.setTextScaleX(1.0f);
    p.setTextSize(t.getTextSize());
    Rect bounds = new Rect();
    float usedWidth = 0f;

    // determine how much to scale the width to fit the view
    for (int i =0;i<lines.length;i++){
        p.getTextBounds(lines[i], 0, lines[i].length(), bounds);
        usedWidth = Math.max(usedWidth,(bounds.right - bounds.left)*pix);
    }

    // same for height, sometimes the calculated height is to less, so use §µ{ instead
    p.getTextBounds("§µ{", 0, 3, bounds);
    float usedHeight = (bounds.bottom - bounds.top)*pix*lines.length;

    float scaleX = providedWidth / usedWidth;
    float scaleY = providedHeight / usedHeight;

    t.setTextSize(TypedValue.COMPLEX_UNIT_PX,t.getTextSize()*Math.min(max,Math.min(scaleX,scaleY)));


}

where is the rest of the code ? where should we call this function? and what is the string provided in "getTextBounds" ? — android developer, Oct 18 '12 at 10:56

score 0 · Accepted Answer · edited May 23 '17 at 12:06

0

Later I've asked a similar question and got an answer to this one:

https://stackoverflow.com/a/17786051/878126

for the custom behaviour, one need to change the code accordingly .

edited May 23 '17 at 12:06

Community

1
1

answered Sep 14 '13 at 20:27

android developer

114,585
152
739
1,270

Textview autofit with multiline support

2 Answers2