java.lang.IllegalArgumentException: Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed

android 9.0 api28 
Process: com.liuan.freereader, PID: 30232     java.lang.IllegalArgumentException: Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed         at android.graphics.Canvas.checkValidClipOp(Canvas.java:779)         at android.graphics.Canvas.clipPath(Canvas.java:1007)         at com.justwayward.reader.view.readview.PageWidget.drawCurrentPageArea(PageWidget.java:217)         at com.justwayward.reader.view.readview.BaseReadView.onDraw(BaseReadView.java:230)         at android.view.View.draw(View.java:20234)
エラーコード

 canvas.clipPath(mPath0, Region.Op.XOR);

ソリューション

        if(Build.VERSION.SDK_INT >= 28){
            canvas.clipPath(mPath0);
        }else {
            canvas.clipPath(mPath0, Region.Op.XOR);
        }