android->view->竖向SeekBar

public class VerticalSeekBar extends SeekBar {
    public VerticalSeekBar(Context context) {
        this (context, null);
    }
        public VerticalSeekBar(Context context, AttributeSet attrs) {
        this (context, attrs, 0);
    }
    public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(h, w, oldh, oldw);
    }

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

    @Override
    protected void onDraw(Canvas c) {
        // 将SeekBar转转90度
        c.rotate(-90);
        // 将旋转后的视图移动回来
        c.translate(-getHeight(), 0);
        LogUtils.log(getClass(), "getHeight(): " + getHeight());
        super.onDraw(c);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled()) { 
           return false; 
        }
        switch (event.getAction() & MotionEvent.ACTION_MASK) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
            case MotionEvent.ACTION_UP:
                int i = 0;
                // 获取滑动的距离
                i = getMax() - (int) (getMax() * event.getY() / getHeight());
                // 设置进度
                setProgress(i);
                LogUtils.log(getClass(), "Progress:" +  getProgress());
                // 每次拖动SeekBar都会调用
                onSizeChanged(getWidth(), getHeight(), 0, 0);
                LogUtils.log(getClass(), "getWidth():" + getWidth());
                LogUtils.log(getClass(), "getHeight():" + getHeight());
                break;
            case MotionEvent.ACTION_CANCEL:
                break;
        }
        return true;
    }
}