Have TextView scale its font size to fill parent?

Question

Is there a way to have a TextView pick a font size such that it fills whatever space it has available? For example:

<LinearLayout
  layout_width="fill_parent"
  layout_height="50dip" >

  <TextView
    layout_width="fill_parent"
    layout_height="fill_parent"
    textSize="scale?" />

</LinearLayout>

Thanks

Answer 1

No, there is not built in font scaling in a TextView. You could overload the onDraw() method in a child of TextView, but TextView does not support scaling the text automatically.

Take a look at this other question.

Answer 2

Just to update, from API 26 (Android 8.0) TextViews has an attribute to scale text on horizontal and vertical axes

<?xml version="1.0" encoding="utf-8"?>
<TextView
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:autoSizeTextType="uniform" />

Check it at Autosizing TextViews

Answer 3

As in the answer Nick Campion quoted, I used a loop and a static layout to iterate to the correct size. My requirements were to fit the width and use no more than one line (no ellipses):

    int i = 0;
    while(i < 2) {
       layout = new StaticLayout(text, textPaint, w, Alignment.ALIGN_NORMAL, 1, 0, true);
        i = layout.getLineCount();
        textSize += 2;
        textPaint.setTextSize(textSize);
    }
    textPaint.setTextSize(textSize*0.95f);