java - SurfaceView绘制出现的问题？
先上两张图压压惊：
如图，带虚拟键的华为手机，图片内容是用SurfaceView画出的背景和一个大圆，一个小圆（转盘），调出虚拟键进入打开正常如下图1，关闭虚拟键如下图2
关闭虚拟键进入打开如下图1，打开虚拟键如下图2
接下来是代码，个人感觉没什么问题
//初始化盘块绘制的范围
mRange = new RectF(mPadding, getMeasuredHeight()/2-mRadius/2, mPadding + mRadius, getMeasuredHeight()/2+mRadius/2); /**
* 绘制背景
*/
private void drawBg() {
mCanvas.drawColor(Color.TRANSPARENT);
mCanvas.drawBitmap(mBackgoundBitmap,0,0,null);
mCanvas.drawBitmap(mBgBitmap, null, new Rect(mPadding/3, (getMeasuredHeight()/2-(getMeasuredWidth()-2*mPadding/3)/2),
getMeasuredWidth() - mPadding/3,
(getMeasuredHeight()/2+(getMeasuredWidth()-2*mPadding/3)/2)), null);
} public void draw() {
try {
mCanvas = mHolder.lockCanvas();
if (mCanvas != null) {
//绘制背景
drawBg();
//绘制盘块
float tmpAngle = mStartAngle;
float sweepAngle = 360 / mItemCount;
for (int i = 0; i < mItemCount; i++) {
mArcPaint.setColor(mColors[i]);
//绘制盘块
mCanvas.drawArc(mRange, tmpAngle, sweepAngle, true, mArcPaint);
//绘制文本
drawText(tmpAngle, sweepAngle, mStrs[i]);
//绘制Icon
drawIcon(tmpAngle, mImgsBitmap[i]);
tmpAngle += sweepAngle;
}疑问：draw()方法是只要SurfaceView没被销毁就一直在执行不断重绘的，从图片可以看出，当把虚拟键关闭的时候，drawBg()画背景和大圆盘的方法是执行了的，但是下面画转盘的代码为什么没执行？该如何解决？
