Android SeekBar Flipped Horizontally

Question

With the Android SeekBar, you can normally drag the thumb to the left or to the right and the yellow progress color is to the left of the thumb. I want the exact opposite, essentially flipping the yellow progress color to the right of the thumb and flipping the entire SeekBar on the y-axis.

Can anyone point me in the right direction? Thanks!

Answer 1

After fiddling around with some code this is what I got and it seems to work pretty well. Hopefully it will help someone else in the future.

public class ReversedSeekBar extends SeekBar {

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

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

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

    @Override
    protected void onDraw(Canvas canvas) {
        float px = this.getWidth() / 2.0f;
        float py = this.getHeight() / 2.0f;

        canvas.scale(-1, 1, px, py);

        super.onDraw(canvas);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        event.setLocation(this.getWidth() - event.getX(), event.getY());

        return super.onTouchEvent(event);
    }
}

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This was thrown together with the help of these two questions:

1. How can you display upside down text with a textview in Android?
2. How can I get a working vertical SeekBar in Android?

Answer 2

Have you tried seekbar.setRotation( 180 )? It flips the seekbar 180 degrees and is upside down, meaning left side is max, right side is 0 with the color on the right of the thumb. No need to create a custom seekbar this way.