华为android 8.0 cavas drawLine问题

Question

画线的时候 不管从哪里开始 他的起始点都在左上角

第一条线的结束会跟第二条线的开始自动画条线
其他手机上就没有这个问题
大佬们帮帮忙
效果图

下面是代码

 public class HandWrite extends View {

    private Paint paint = null;
    private Bitmap originalBitmap = null;
    private Bitmap new1Bitmap = null;
    private Bitmap new2Bitmap = null;
    private float clickX = 0,clickY = 0;
    private float startX = 0,startY = 0;
    private boolean isMove = true;
    private boolean isClear = false;
    private int color = Color.BLUE;//getResources().getColor(R.color.blue);
    private float strokeWidth = 2.0f;
    public HandWrite(Context context, AttributeSet attrs)
    {
        super(context, attrs);
        originalBitmap = BaseApplication.getInstance().getSharephoto();
        new1Bitmap = Bitmap.createBitmap(originalBitmap);
    }

    public void setBitmap(Bitmap bitmap){
        originalBitmap = bitmap;
        new1Bitmap = Bitmap.createBitmap(originalBitmap);
    }
    public void clear(){
        isClear = true;
        new2Bitmap = Bitmap.createBitmap(originalBitmap);
        invalidate();
    }
    public void setstyle(float strokeWidth){
        this.strokeWidth = strokeWidth;
    }
    @Override
    protected void onDraw(Canvas canvas)
    {
        super.onDraw(canvas);

        canvas.drawBitmap(HandWriting(new1Bitmap), 0, 0,null);

    }
    Canvas canvas = null;
    public Bitmap HandWriting(Bitmap originalBitmap)
    {


        if(isClear){
            canvas = new Canvas(new2Bitmap);

        }
        else{
            canvas = new Canvas(originalBitmap);
//          canvas.drawColor(Color.WHITE);
//          canvas.setBitmap(originalBitmap);

        }
        paint = new Paint();
        paint.setStyle(Paint.Style.STROKE);
        paint.setAntiAlias(true);
        paint.setColor(color);
        paint.setStrokeWidth(strokeWidth);

        if(isMove){
            canvas.drawLine(startX, startY, clickX, clickY, paint);

        }
        startX = clickX;
        startY = clickY;


        if(isClear){
            return new2Bitmap;
        }
        BaseApplication.getInstance().setSharephoto(originalBitmap);
        return originalBitmap;
    }
    public Bitmap getBitmap(){
        return originalBitmap;
    }

    @Override
    public boolean onTouchEvent(MotionEvent event)
    {
        clickX = event.getX();
        clickY = event.getY();
        if(event.getAction() == MotionEvent.ACTION_DOWN){

            isMove = false;
            invalidate();
            return true;
        }
        else if(event.getAction() == MotionEvent.ACTION_MOVE){

            isMove = true;
            invalidate();
            return true;
        }

        return super.onTouchEvent(event);
    }







}