Android Crash：only INTERSECT and DIFFERENCE are allowed

Crash信息：

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)

报错代码：

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

crash 原因：

Canvas.java 源码
   
   public enum Op {
        DIFFERENCE(0),
        INTERSECT(1),
        UNION(2),
        XOR(3),
        REVERSE_DIFFERENCE(4),
        REPLACE(5);
        Op(int nativeInt) {
            this.nativeInt = nativeInt;
        }
        /**
         * @hide
         */
        public final int nativeInt;
    }
    
   private static void checkValidClipOp(@NonNull Region.Op op) {
        if (sCompatiblityVersion >= Build.VERSION_CODES.P
                && op != Region.Op.INTERSECT && op != Region.Op.DIFFERENCE) {
            throw new IllegalArgumentException(
                    "Invalid Region.Op - only INTERSECT and DIFFERENCE are allowed");
        }
    }

修改意见：

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