Android TextView with Auto Sized Content

While working on an Android project lately I was looking for a solution to auto-size text in a TextView similar to the way the iPhone ADK allows you to select “fit text to box”. I couldn’t find any reference to something similar in the Android SDK so I had to roll my own TextView subclass.

Now all I have to do is call setFitTextToBox(true) on the TextFitTextView after allocation. Enjoy!

public class TextFitTextView extends TextView {

    static final String TAG = "TextFitTextView";
    boolean fit = false;

    public TextFitTextView(Context context) {
        super(context);
    }

    public TextFitTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public TextFitTextView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public void setFitTextToBox( Boolean fit ) {
        this.fit = fit;
    }

    protected void onDraw (Canvas canvas) {
        super.onDraw(canvas);
        if (fit) _shrinkToFit();
    }

    protected void _shrinkToFit() {

        int height = this.getHeight();
        int lines = this.getLineCount();
        Rect r = new Rect();
        int y1 = this.getLineBounds(0, r);
        int y2 = this.getLineBounds(lines-1, r);

        float size = this.getTextSize();
        if (y2 > height && size >= 8.0f) {
            this.setTextSize(size - 2.0f);
            _shrinkToFit();
        }

    }
}