本文实例讲述了Android canvas画图操作之切割画布实现方法。分享给大家供大家参考，具体如下：

android切割画布的历程不算很难，可是理解起来也比较麻烦，这里写一下我的理解 但是不一定正确：

canvas.clipRect(30, 30, 70, 70, Region.Op.XOR);

最后一个参数有多个选择分别是：

//DIFFERENCE是第一次不同于第二次的部分显示出来

//REPLACE是显示第二次的

//REVERSE_DIFFERENCE 是第二次不同于第一次的部分显示

//INTERSECT交集显示

//UNION全部显示

//XOR补集 就是全集的减去交集生育部分显示

import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import android.graphics.Region; import android.util.AttributeSet; import android.view.View; public class sBook extends View{ Context mContext; Paint mPaint; Path mPath; public sBook(Context context) { super(context); init(); } public sBook(Context context, AttributeSet attrs) { super(context, attrs); init(); } public sBook(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(); } private void init(){ mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setStrokeWidth(6); mPaint.setTextSize(16); mPaint.setTextAlign(Paint.Align.RIGHT); mPath = new Path(); } protected void onDraw(Canvas canvas){ canvas.drawColor(Color.GRAY); canvas.save(); canvas.translate(10, 10); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(160, 10); canvas.clipRect(10, 10, 90, 90); canvas.clipRect(30, 30, 70, 70, Region.Op.XOR); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(10, 160); mPath.reset(); // canvas.clipPath(mPath); // makes the clip empty // mPath.addCircle(50, 50, 50, Path.Direction.CCW); mPath.cubicTo(0, 0, 100, 0, 100, 100); mPath.cubicTo(100, 100, 0, 100, 0, 0); canvas.clipPath(mPath, Region.Op.REPLACE); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(160, 160); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.UNION); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(10, 310); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.XOR); drawScene(canvas); canvas.restore(); canvas.save(); canvas.translate(160, 310); canvas.clipRect(0, 0, 60, 60); canvas.clipRect(40, 40, 100, 100, Region.Op.REVERSE_DIFFERENCE); drawScene(canvas); canvas.restore(); } private void drawScene(Canvas canvas) { canvas.clipRect(0, 0, 100, 100); canvas.drawColor(Color.WHITE); mPaint.setColor(Color.RED); canvas.drawLine(0, 0, 100, 100, mPaint); mPaint.setColor(Color.GREEN); canvas.drawCircle(30, 70, 30, mPaint); mPaint.setColor(Color.BLUE); canvas.drawText("Clipping", 100, 30, mPaint); } }

希望本文所述对大家Android程序设计有所帮助。