垂直的SeekBar

在Android中由于默认的SeekBar是水平样式的，所以垂直的样式需要通过自定义来确定样式。首先上自定义的代码

public class VerticalSeekBar extends SeekBar {

    private SeekBar.OnSeekBarChangeListener mOnSeekBarChangeListener;
    int i=0;



    public VerticalSeekBar(Context context) {

        super(context);

    }



    public VerticalSeekBar(Context context, AttributeSet attrs, int defStyle) {

        super(context, attrs, defStyle);

    }



    public VerticalSeekBar(Context context, AttributeSet attrs) {

        super(context, attrs);

    }
    public void setOnSeekBarChangeListener(SeekBar.OnSeekBarChangeListener l) {
        mOnSeekBarChangeListener = l;
    }

    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());

    }



    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);

        Log.i("getHeight()",getHeight()+"");

        super.onDraw(c);

    }

    void onStartTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStartTrackingTouch(this);
        }
    }

    void onProgressChanged() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onProgressChanged(this,i,true);
        }
    }

    void onStopTrackingTouch() {
        if (mOnSeekBarChangeListener != null) {
            mOnSeekBarChangeListener.onStopTrackingTouch(this);
        }
    }

    @Override

    public boolean onTouchEvent(MotionEvent event) {

        if (!isEnabled()) {

            return false;

        }



        switch (event.getAction()) {

            case MotionEvent.ACTION_DOWN:
                onStartTrackingTouch();
                break;
            case MotionEvent.ACTION_MOVE:

                //获取滑动的距离

                i=getMax() - (int) (getMax() * event.getY() / getHeight());

                //设置进度

                setProgress(i);

                Log.i("Progress",getProgress()+"");

                //每次拖动SeekBar都会调用

                onSizeChanged(getWidth(), getHeight(), 0, 0);

                Log.i("getWidth()",getWidth()+"");

                Log.i("getHeight()",getHeight()+"");
                onProgressChanged();
                break;
            case MotionEvent.ACTION_UP:
                onStopTrackingTouch();
                break;
            case MotionEvent.ACTION_CANCEL:
                onStopTrackingTouch();
                break;
        }
        return true;
    }
}

接下来在xml中引用自定义文件就可以了

由于有时候需要自己更改SeekBar的背景，所以要在Drawable创建文件更改背景