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在<Activity>中加入这一行android:screenOrientation="landscape/portrait "，android中每次屏幕的切换动会重启Activity		，不过如果使用android:configChanges="keyboardHidden|orientation"，当我们横竖屏切换的时候会直接调用onCreate方法中的onConfigurationChanged方法，而不会重新执行onCreate方法，那当然如果不配置这个属性的话就会重新调用onCreate方法了

1.放大缩放图片大小
Bitmap bitmap=null;
bitmap=BitmapFactory.decodeResource(getResources(),resourcesID);
int bitWidth=bitmap.getWidth();
int bitHeight=bitmap.getHeight();
float scaleWidth=src_width/(float)bitWidth;(src_width可以是桌面宽度)
float scaleHeight=src_height/(float)bitHight;
Matrix matrix=new Matrix();
matrix.postScale(scaleWidth,scaleHeight);
bitMap=Bitmap.createBitmap(bitmap,0,0,bitWidth,bitHeight,Matrix,true)

在surfaceView初始化函数的时候不要对ScreenW和ScreenH进行赋值，如果你在初始化调用ScreenW = this.getWidth();和ScreenH = this.getHeight();得到的值全部为0,只有SurfaceCreated()执行的时候，真正的view才会被建立

mCanvas = mHolder.lockCanvas();
		mCanvas.drawRect(0, 0, mScreenWidth, mScreenHeight, mPaint1);
		mCanvas.save();
		mCanvas.drawText("xlm", initX + 2, initY - 5, mPaint2);
		/**
		 * mCanvas.clipRect
		 * 是为了抠出一个小人出来，放mCanvas.drawBitmap中的图片，同时mCanvas.drawBitmap为什么要initX -
		 * animation_image[frameCount] bitmap.getWidth() / 4, initY - 3 *
		 * bitmap.getHeight() / 4 捏？其根本原因就是为了将bitmap左移上移，来显示出bitmap这一大张图片中的每张小图
		 */
		mCanvas.clipRect(initX, initY, initX + bitmap.getWidth() / 4, initY
				+ bitmap.getHeight() / 4);
		if (up) {
			mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]
					* bitmap.getWidth() / 4,
					initY - 3 * bitmap.getHeight() / 4, mPaint1);
		} else if (down) {
			mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]
					* bitmap.getWidth() / 4, initY, mPaint1);
		} else if (left) {
			mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]
					* bitmap.getWidth() / 4,
					initY - 1 * bitmap.getHeight() / 4, mPaint1);
		} else if (right) {
			mCanvas.drawBitmap(bitmap, initX - animation_image[frameCount]
					* bitmap.getWidth() / 4,
					initY - 2 * bitmap.getHeight() / 4, mPaint1);
		}
		mCanvas.restore();
		mHolder.unlockCanvasAndPost(mCanvas);