SeekBar Thumb position issue

Question

I\'m trying to do a \"labeled\" thumb for my Seekbar. The objective is to customize a text above the thumb every time the Seekbar position changes.

I\'m doing this:

Answer 1

I've ended up extending from SeekBar, and overriding the onMeasure() and onDraw methods(), that was the only way I've found to so the label/thumb thing work.

Posting it to help others:

...
    @Override
    protected synchronized void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
     {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        if (labelBackground != null)
        {

            viewWidth = getMeasuredWidth();
            barHeight = getMeasuredHeight();// returns only the bar height (without the label);
            setMeasuredDimension(viewWidth, barHeight + labelBackground.getHeight());
        }

    }



    @Override
    protected synchronized void onDraw(Canvas canvas)
    {
        if (labelBackground != null)
        {
            barBounds.left = getPaddingLeft();
            barBounds.top = labelBackground.getHeight() + getPaddingTop();
            barBounds.right = barBounds.left + viewWidth - getPaddingRight() - getPaddingLeft();
            barBounds.bottom = barBounds.top + barHeight - getPaddingBottom() - getPaddingTop();

            progressPosX = barBounds.left + ((float) this.getProgress() / (float) this.getMax()) * barBounds.width();

            labelPos.x = (int) progressPosX - labelOffset;
            labelPos.y = getPaddingTop();

            progressDrawable = getProgressDrawable();
            progressDrawable.setBounds(barBounds.left, barBounds.top, barBounds.right, barBounds.bottom);
            progressDrawable.draw(canvas);

            labelTextPaint.getTextBounds(labelText, 0, labelText.length(), labelTextRect);

            canvas.drawBitmap(labelBackground, labelPos.x, labelPos.y, labelBackgroundPaint);
            canvas.drawText(labelText, labelPos.x + labelBackground.getWidth() / 2 - labelTextRect.width() / 2, labelPos.y + labelBackground.getHeight() / 2 + labelTextRect.height() / 2, labelTextPaint);

            thumbX = (int) progressPosX - getThumbOffset();
            thumbDrawable.setBounds(thumbX, barBounds.top, thumbX + thumbDrawable.getIntrinsicWidth(), barBounds.top + thumbDrawable.getIntrinsicHeight());
            thumbDrawable.draw(canvas);
        } else
        {
            super.onDraw(canvas);
        }
    }

Result:

Answer 2

Pass int progress to the method where you set drawable to the seekBar and use setProgress() method:

private void setSeekBarLabel(String text, int progress)
{
    BitmapDrawable thumb = Utils.writeOnBitmap(thumbBmp, text, 0, 0, thumbLablePaint);
    seekBar.setThumb(thumb);
    seekBar.setProgress(progress);
}

and add the second argument to the calling method:

setSeekBarLabel(String.valueOf(progress), progress);