转载请标明出处：http://blog.csdn.net/lmj623565791/article/details/39480503，本文出自：【张鸿洋的博客】
上一篇已经带大家实现了自由的放大缩小图片，简单介绍了下Matrix；具体请参考：Android 手势检测实战 打造支持缩放平移的图片预览效果（上）；本篇继续完善我们的ImageView~~
首先加入放大后的移动~~
1、自由的进行移动#
我们在onTouchEvent里面，加上移动的代码，当然了，必须长或宽大于屏幕才可以移动~~~
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
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- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">boolean</span> onTouch(View v, MotionEvent event)
- {
- mScaleGestureDetector.onTouchEvent(event);
-
- <span class="keyword">float</span> x = <span class="number"></span>, y = <span class="number"></span>;
- <span class="comment">// 拿到触摸点的个数</span>
- <span class="keyword">final</span> <span class="keyword">int</span> pointerCount = event.getPointerCount();
- <span class="comment">// 得到多个触摸点的x与y均值</span>
- <span class="keyword">for</span> (<span class="keyword">int</span> i = <span class="number"></span>; i < pointerCount; i++)
- {
- x += event.getX(i);
- y += event.getY(i);
- }
- x = x / pointerCount;
- y = y / pointerCount;
-
- <span class="comment">/**</span>
- <span class="comment"> * 每当触摸点发生变化时，重置mLasX , mLastY </span>
- <span class="comment"> */</span>
- <span class="keyword">if</span> (pointerCount != lastPointerCount)
- {
- isCanDrag = <span class="keyword">false</span>;
- mLastX = x;
- mLastY = y;
- }
-
-
- lastPointerCount = pointerCount;
-
- <span class="keyword">switch</span> (event.getAction())
- {
- <span class="keyword">case</span> MotionEvent.ACTION_MOVE:
- Log.e(TAG, <span class="string">“ACTION_MOVE”</span>);
- <span class="keyword">float</span> dx = x – mLastX;
- <span class="keyword">float</span> dy = y – mLastY;
-
- <span class="keyword">if</span> (!isCanDrag)
- {
- isCanDrag = isCanDrag(dx, dy);
- }
- <span class="keyword">if</span> (isCanDrag)
- {
- RectF rectF = getMatrixRectF();
- <span class="keyword">if</span> (getDrawable() != <span class="keyword">null</span>)
- {
- isCheckLeftAndRight = isCheckTopAndBottom = <span class="keyword">true</span>;
- <span class="comment">// 如果宽度小于屏幕宽度，则禁止左右移动</span>
- <span class="keyword">if</span> (rectF.width() < getWidth())
- {
- dx = <span class="number"></span>;
- isCheckLeftAndRight = <span class="keyword">false</span>;
- }
- <span class="comment">// 如果高度小雨屏幕高度，则禁止上下移动</span>
- <span class="keyword">if</span> (rectF.height() < getHeight())
- {
- dy = <span class="number"></span>;
- isCheckTopAndBottom = <span class="keyword">false</span>;
- }
- mScaleMatrix.postTranslate(dx, dy);
- checkMatrixBounds();
- setImageMatrix(mScaleMatrix);
- }
- }
- mLastX = x;
- mLastY = y;
- <span class="keyword">break</span>;
-
- <span class="keyword">case</span> MotionEvent.ACTION_UP:
- <span class="keyword">case</span> MotionEvent.ACTION_CANCEL:
- Log.e(TAG, <span class="string">“ACTION_UP”</span>);
- lastPointerCount = <span class="number"></span>;
- <span class="keyword">break</span>;
- }
-
- <span class="keyword">return</span> <span class="keyword">true</span>;
- }
首先我们拿到触摸点的数量，然后求出多个触摸点的平均值，设置给我们的mLastX , mLastY ， 然后在移动的时候，得到dx ,dy 进行范围检查以后，调用mScaleMatrix.postTranslate进行设置偏移量，当然了，设置完成以后，还需要再次校验一下，不能把图片移动的与屏幕边界出现白边，校验完成后，调用setImageMatrix.
这里：需要注意一下，我们没有复写ACTION_DOWM，是因为，ACTION_DOWN在多点触控的情况下，只要有一个手指按下状态，其他手指按下不会再次触发ACTION_DOWN，但是多个手指以后，触摸点的平均值会发生很大变化，所以我们没有用到ACTION_DOWN。每当触摸点的数量变化，我们就会跟新当前的mLastX,mLastY.
下面是上面用到的两个私有方法，一个用于检查边界，一个用于判断是否是拖动的操作：
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_2" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_2">
</embed>
</div>
</div>
- <span class="comment">/**</span>
- <span class="comment"> * 移动时，进行边界判断，主要判断宽或高大于屏幕的</span>
- <span class="comment"> */</span>
- <span class="keyword">private</span> <span class="keyword">void</span> checkMatrixBounds()
- {
- RectF rect = getMatrixRectF();
-
- <span class="keyword">float</span> deltaX = <span class="number"></span>, deltaY = <span class="number"></span>;
- <span class="keyword">final</span> <span class="keyword">float</span> viewWidth = getWidth();
- <span class="keyword">final</span> <span class="keyword">float</span> viewHeight = getHeight();
- <span class="comment">// 判断移动或缩放后，图片显示是否超出屏幕边界</span>
- <span class="keyword">if</span> (rect.top > <span class="number"></span> && isCheckTopAndBottom)
- {
- deltaY = -rect.top;
- }
- <span class="keyword">if</span> (rect.bottom < viewHeight && isCheckTopAndBottom)
- {
- deltaY = viewHeight – rect.bottom;
- }
- <span class="keyword">if</span> (rect.left > <span class="number"></span> && isCheckLeftAndRight)
- {
- deltaX = -rect.left;
- }
- <span class="keyword">if</span> (rect.right < viewWidth && isCheckLeftAndRight)
- {
- deltaX = viewWidth – rect.right;
- }
- mScaleMatrix.postTranslate(deltaX, deltaY);
- }
-
- <span class="comment">/**</span>
- <span class="comment"> * 是否是推动行为</span>
- <span class="comment"> * </span>
- <span class="comment"> * @param dx</span>
- <span class="comment"> * @param dy</span>
- <span class="comment"> * @return</span>
- <span class="comment"> */</span>
- <span class="keyword">private</span> <span class="keyword">boolean</span> isCanDrag(<span class="keyword">float</span> dx, <span class="keyword">float</span> dy)
- {
- <span class="keyword">return</span> Math.sqrt((dx * dx) + (dy * dy)) >= mTouchSlop;
- }
这样，我们就可以快乐的放大、缩小加移动了~~~
效果图：这次换个男人的图片，我们越狱的主角之一，TBug~
我们的缩放+移动搞定~~
2、双击放大与缩小#
谈到双击事件，我们的GestureDetector终于要登场了，这哥们可以捕获双击事件~~
1、GestureDetector的使用#
因为GestureDetector设置监听器的话，方法一大串，而我们只需要onDoubleTap这个回调，所以我们准备使用它的一个内部类SimpleOnGestureListener，对接口的其他方法实现了空实现。
不过还有几个问题需要讨论下，才能开始我们的代码：
1、我们双击尺寸如何变化？
我是这样的，根据当前的缩放值，如果是小于2的，我们双击直接到变为原图的2倍；如果是2,4之间的，我们双击直接为原图的4倍；其他状态也就是4倍，双击后还原到最初的尺寸。
如果你觉得这样不合适，可以根据自己的爱好调整。
2、我们双击变化，需要一个动画~~比如我们上例的演示图，图片很大，全屏显示的时候initScale=0.5左后，如果双击后变为2，也就是瞬间大了四倍，没有一个过渡的效果的话，给用户的感觉会特别差。所以，我们准备使用postDelay执行一个Runnable，Runnable中再次根据的当然的缩放值继续执行。
首先我们在构造方法中，完成对GestureDetector的初始化，以及设置onDoubleTap监听
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
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<embed id="ZeroClipboardMovie_3" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_3">
</embed>
</div>
</div>
- <span class="keyword">public</span> ZoomImageView(Context context, AttributeSet attrs)
- {
- <span class="keyword">super</span>(context, attrs);
- mScaleGestureDetector = <span class="keyword">new</span> ScaleGestureDetector(context, <span class="keyword">this</span>);
- mGestureDetector = <span class="keyword">new</span> GestureDetector(context,
- <span class="keyword">new</span> SimpleOnGestureListener()
- {
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">boolean</span> onDoubleTap(MotionEvent e)
- {
- <span class="keyword">if</span> (isAutoScale == <span class="keyword">true</span>)
- <span class="keyword">return</span> <span class="keyword">true</span>;
-
- <span class="keyword">float</span> x = e.getX();
- <span class="keyword">float</span> y = e.getY();
- Log.e(<span class="string">“DoubleTap”</span>, getScale() + <span class="string">” , “</span> + initScale);
- <span class="keyword">if</span> (getScale() < SCALE_MID)
- {
- ZoomImageView.<span class="keyword">this</span>.postDelayed(
- <span class="keyword">new</span> AutoScaleRunnable(SCALE_MID, x, y), <span class="number">16</span>);
- isAutoScale = <span class="keyword">true</span>;
- } <span class="keyword">else</span> <span class="keyword">if</span> (getScale() >= SCALE_MID
- && getScale() < SCALE_MAX)
- {
- ZoomImageView.<span class="keyword">this</span>.postDelayed(
- <span class="keyword">new</span> AutoScaleRunnable(SCALE_MAX, x, y), <span class="number">16</span>);
- isAutoScale = <span class="keyword">true</span>;
- } <span class="keyword">else</span>
- {
- ZoomImageView.<span class="keyword">this</span>.postDelayed(
- <span class="keyword">new</span> AutoScaleRunnable(initScale, x, y), <span class="number">16</span>);
- isAutoScale = <span class="keyword">true</span>;
- }
-
- <span class="keyword">return</span> <span class="keyword">true</span>;
- }
- });
- mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
- <span class="keyword">super</span>.setScaleType(ScaleType.MATRIX);
- <span class="keyword">this</span>.setOnTouchListener(<span class="keyword">this</span>);
- }
1、当双击的时候，首先判断是否正在自动缩放，如果在，直接retrun ;
2、然后就进入了我们的if，如果当然是scale小于2，则通过view.发送一个Runnable进行执行；其他类似；
下面看我们的Runnable的代码：
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_4" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_4">
</embed>
</div>
</div>
- <span class="comment">/**</span>
- <span class="comment"> * 自动缩放的任务</span>
- <span class="comment"> * </span>
- <span class="comment"> * @author zhy</span>
- <span class="comment"> * </span>
- <span class="comment"> */</span>
- <span class="keyword">private</span> <span class="keyword">class</span> AutoScaleRunnable <span class="keyword">implements</span> Runnable
- {
- <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">float</span> BIGGER = <span class="number">1</span>.07f;
- <span class="keyword">static</span> <span class="keyword">final</span> <span class="keyword">float</span> SMALLER = <span class="number"></span>.93f;
- <span class="keyword">private</span> <span class="keyword">float</span> mTargetScale;
- <span class="keyword">private</span> <span class="keyword">float</span> tmpScale;
-
- <span class="comment">/**</span>
- <span class="comment"> * 缩放的中心</span>
- <span class="comment"> */</span>
- <span class="keyword">private</span> <span class="keyword">float</span> x;
- <span class="keyword">private</span> <span class="keyword">float</span> y;
-
- <span class="comment">/**</span>
- <span class="comment"> * 传入目标缩放值，根据目标值与当前值，判断应该放大还是缩小</span>
- <span class="comment"> * </span>
- <span class="comment"> * @param targetScale</span>
- <span class="comment"> */</span>
- <span class="keyword">public</span> AutoScaleRunnable(<span class="keyword">float</span> targetScale, <span class="keyword">float</span> x, <span class="keyword">float</span> y)
- {
- <span class="keyword">this</span>.mTargetScale = targetScale;
- <span class="keyword">this</span>.x = x;
- <span class="keyword">this</span>.y = y;
- <span class="keyword">if</span> (getScale() < mTargetScale)
- {
- tmpScale = BIGGER;
- } <span class="keyword">else</span>
- {
- tmpScale = SMALLER;
- }
-
- }
-
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">void</span> run()
- {
- <span class="comment">// 进行缩放</span>
- mScaleMatrix.postScale(tmpScale, tmpScale, x, y);
- checkBorderAndCenterWhenScale();
- setImageMatrix(mScaleMatrix);
-
- <span class="keyword">final</span> <span class="keyword">float</span> currentScale = getScale();
- <span class="comment">//如果值在合法范围内，继续缩放</span>
- <span class="keyword">if</span> (((tmpScale > 1f) && (currentScale < mTargetScale))
- || ((tmpScale < 1f) && (mTargetScale < currentScale)))
- {
- ZoomImageView.<span class="keyword">this</span>.postDelayed(<span class="keyword">this</span>, <span class="number">16</span>);
- } <span class="keyword">else</span><span class="comment">//设置为目标的缩放比例</span>
- {
- <span class="keyword">final</span> <span class="keyword">float</span> deltaScale = mTargetScale / currentScale;
- mScaleMatrix.postScale(deltaScale, deltaScale, x, y);
- checkBorderAndCenterWhenScale();
- setImageMatrix(mScaleMatrix);
- isAutoScale = <span class="keyword">false</span>;
- }
-
- }
- }
代码写完了，我们依然需要把我们的event传给它，依然是在onTouch方法：
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_5" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_5">
</embed>
</div>
</div>
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">boolean</span> onTouch(View v, MotionEvent event)
- {
- <span class="keyword">if</span> (mGestureDetector.onTouchEvent(event))
- <span class="keyword">return</span> <span class="keyword">true</span>;
好了，双击放大与缩小的功能就搞定了，下面测试下~~~
效果图，终于可以用模拟器了~~：
3、处理与ViewPager的冲突#
直接把我们的图片作为ViewPager的Item，可想而知，肯定有冲突~~
1、布局文件#
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_6" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_6">
</embed>
</div>
</div>
- <RelativeLayout xmlns:android=<span class="string">“http://schemas.android.com/apk/res/android”</span>
- xmlns:tools=<span class="string">“http://schemas.android.com/tools”</span>
- android:layout_width=<span class="string">“match_parent”</span>
- android:layout_height=<span class="string">“match_parent”</span> >
-
- <android.support.v4.view.ViewPager
- android:id=<span class="string">“@+id/id_viewpager”</span>
- android:layout_width=<span class="string">“fill_parent”</span>
- android:layout_height=<span class="string">“fill_parent”</span> >
- </android.support.v4.view.ViewPager>
-
- </RelativeLayout>
2、Activity代码
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_7" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_7">
</embed>
</div>
</div>
- <span class="keyword">package</span> com.zhy.zhy_scalegesturedetector02;
-
- <span class="keyword">import</span> android.app.Activity;
- <span class="keyword">import</span> android.os.Bundle;
- <span class="keyword">import</span> android.support.v4.view.PagerAdapter;
- <span class="keyword">import</span> android.support.v4.view.ViewPager;
- <span class="keyword">import</span> android.view.View;
- <span class="keyword">import</span> android.view.ViewGroup;
- <span class="keyword">import</span> android.widget.ImageView;
-
- <span class="keyword">import</span> com.zhy.view.ZoomImageView;
-
- <span class="keyword">public</span> <span class="keyword">class</span> MainActivity <span class="keyword">extends</span> Activity
- {
- <span class="keyword">private</span> ViewPager mViewPager;
- <span class="keyword">private</span> <span class="keyword">int</span>[] mImgs = <span class="keyword">new</span> <span class="keyword">int</span>[] { R.drawable.tbug, R.drawable.a,
- R.drawable.xx };
- <span class="keyword">private</span> ImageView[] mImageViews = <span class="keyword">new</span> ImageView[mImgs.length];
-
- <span class="annotation">@Override</span>
- <span class="keyword">protected</span> <span class="keyword">void</span> onCreate(Bundle savedInstanceState)
- {
- <span class="keyword">super</span>.onCreate(savedInstanceState);
- setContentView(R.layout.vp);
-
- mViewPager = (ViewPager) findViewById(R.id.id_viewpager);
- mViewPager.setAdapter(<span class="keyword">new</span> PagerAdapter()
- {
-
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> Object instantiateItem(ViewGroup container, <span class="keyword">int</span> position)
- {
- ZoomImageView imageView = <span class="keyword">new</span> ZoomImageView(
- getApplicationContext());
- imageView.setImageResource(mImgs[position]);
- container.addView(imageView);
- mImageViews[position] = imageView;
- <span class="keyword">return</span> imageView;
- }
-
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">void</span> destroyItem(ViewGroup container, <span class="keyword">int</span> position,
- Object object)
- {
- container.removeView(mImageViews[position]);
- }
-
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">boolean</span> isViewFromObject(View arg0, Object arg1)
- {
- <span class="keyword">return</span> arg0 == arg1;
- }
-
- <span class="annotation">@Override</span>
- <span class="keyword">public</span> <span class="keyword">int</span> getCount()
- {
- <span class="keyword">return</span> mImgs.length;
- }
- });
-
- }
- }
现在直接运行，发现ViewPager好着呢，但是我们的图片放大以后，移动和ViewPager冲突了，又不能移动了~。。。擦擦擦。。。
3、处理冲突#
现在我们迅速的想一想，记得之前学习过事件分发机制，我们的ZoomImageView在ViewPager中，如果我们不想被拦截，那么如何做呢？
首先不想被拦截的条件是：我们的宽或高大于屏幕宽或高时，因为此时可以移动，我们不想被拦截。接下来，不想被拦截：
getParent().requestDisallowInterceptTouchEvent(true);
一行代码足以，如果你对事件分发中，不被拦截不清晰，可以参考：如何不被拦截 。
放在一起我们的代码就是：
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_8" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_8">
</embed>
</div>
</div>
- <span class="keyword">switch</span> (event.getAction())
- {
- <span class="keyword">case</span> MotionEvent.ACTION_DOWN:
- <span class="keyword">if</span> (rectF.width() > getWidth() || rectF.height() > getHeight())
- {
- getParent().requestDisallowInterceptTouchEvent(<span class="keyword">true</span>);
- }
- <span class="keyword">break</span>;
- <span class="keyword">case</span> MotionEvent.ACTION_MOVE:
- <span class="keyword">if</span> (rectF.width() > getWidth() || rectF.height() > getHeight())
- {
- getParent().requestDisallowInterceptTouchEvent(<span class="keyword">true</span>);
- }
~当宽或高大于屏幕宽或高时，拖动效果认为是移动图片，反之则让ViewPager去处理
此时的效果：
ok，现在已经解决了和ViewPager的冲突，ps：尼玛不应该双击还能放大两次到4倍，，，，，好恶心。。。
4、到达边界事件交给ViewPager处理#
可能有些用户还希望，当图片到达边界时，不能再拖动的时候，能够把事件给ViewPager
那就在ACTION_MOVE中，判断当前已经到达边界，且还在拉的时候，事件交给ViewPager
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_9" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_9">
</embed>
</div>
</div>
- <span class="keyword">if</span> (isCanDrag)
- {
-
- <span class="keyword">if</span> (getDrawable() != <span class="keyword">null</span>)
- {
- <span class="keyword">if</span> (getMatrixRectF().left == <span class="number"></span> && dx > <span class="number"></span>)
- {
- getParent().requestDisallowInterceptTouchEvent(<span class="keyword">false</span>);
- }
-
- <span class="keyword">if</span> (getMatrixRectF().right == getWidth() && dx < <span class="number"></span>)
- {
- getParent().requestDisallowInterceptTouchEvent(<span class="keyword">false</span>);
- }
此时的效果：
好了，其实添加了这个之后，体验一般哈~~~
终于写完了，代码中可能存在BUG，发现问题，或者解决了发现的BUG时，希望可以直接在博客下面留言，也能够方便他人~~
到此，我们的Android 手势检测实战 打造支持缩放平移的图片预览效果 结束~~！
建议把双击放大到4倍的地方，注释掉一个If
**[java]** [view plain](http://blog.csdn.net/lmj623565791/article/details/39480503#)[copy](http://blog.csdn.net/lmj623565791/article/details/39480503#)
<div>
<embed id="ZeroClipboardMovie_10" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" type="application/x-shockwave-flash" width="18" height="18" align="middle" name="ZeroClipboardMovie_10">
</embed>
</div>
</div>
- <span class="comment">// else if (getScale() >= SCALE_MID</span>
- <span class="comment">// && getScale() < SCALE_MAX)</span>
- <span class="comment">// {</span>
- <span class="comment">// ZoomImageView.this.postDelayed(</span>
- <span class="comment">// new AutoScaleRunnable(SCALE_MAX, x, y), 16);</span>
- <span class="comment">// isAutoScale = true;</span>
- <span class="comment">// } </span>
连续双击放大，感觉不爽，代码已经上传，我就不重传了，如果你也觉得不爽，可以自行注释。
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