竖直的SeekBar(从上到下，从下到上)

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.widget.SeekBar;

/**
 * Created by snail on 2019/1/7.
 */

@SuppressLint("AppCompatCustomView")
public class VerticalSeekBar extends SeekBar {

    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);
    }

    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) {

        //从下到上
        //将SeekBar转转90度
//        c.rotate(-90);
//        //将旋转后的视图移动回来
//        c.translate(-getHeight(), 0);

        //从上到下
        c.rotate(90);
        c.translate(0,-getWidth());
        Log.i("getHeight()", getHeight() + "");
        super.onDraw(c);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (!isEnabled()) {
            return false;
        }

        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
            case MotionEvent.ACTION_MOVE:
            case MotionEvent.ACTION_UP:
                int i = 0;
                //从下到上
//                i = getMax() - (int) (getMax() * event.getY() / getHeight());
//                //设置进度
//                setProgress(i);

                //从上到下
                setProgress((int) (getMax() * event.getY() / getHeight()));

                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() + "");
                break;

            case MotionEvent.ACTION_CANCEL:
                break;
        }
        return true;
    }
}