// int gravity: see android.view.Gravity, like Gravity.LEFT, Gravity.BOTTOM, etc
    public Bitmap addText(Bitmap in, String text, int gravity){
        Bitmap out = in.copy(Bitmap.Config.ARGB_8888,true);
        Canvas canvas = new Canvas(out);

        Paint paint = new Paint();
        paint.setColor(Color.WHITE);
        paint.setStyle(Paint.Style.FILL);
        Paint textPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
        textPaint.setColor(Color.BLACK);
//        textPaint.setTextSize(128);
        textPaint.setTextAlign(Paint.Align.LEFT);

        Rect inBounds = new Rect();
        textPaint.getTextBounds(text, 0, text.length(), inBounds);
        float scale = out.getWidth() * 0.35f / inBounds.width();

        Rect container = new Rect(0, 0, out.getWidth(), out.getHeight());
        Rect outBounds = new Rect();
        int w = (int) (inBounds.width() * scale);
        int h = (int) (inBounds.height() * scale);
        Gravity.apply(gravity, w, h, container, outBounds);

        canvas.drawRect(outBounds, paint);
        Matrix matrix = new Matrix();
        RectF src = new RectF(inBounds);
        RectF dst = new RectF(outBounds);
        matrix.setRectToRect(src, dst, Matrix.ScaleToFit.CENTER);
        canvas.concat(matrix);
        canvas.drawText(text, 0, 0, textPaint);
        return out;
    }