解决PhotoView的报错信息：ImageView no longer exists. You should not use this PhotoViewAttacher any more.

PhotoView是一个易于使用的带缩放ImageView功能的第三方开源框架。项目地址(链接)

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最近接收公司的多媒体项目，处理图片这个模块的时候，发现经常弹出以下异常信息：

ImageView no longer exists. You should not use this PhotoViewAttacher any more.

google了一下，发现第一页的搜索结果，给出的解决办法(链接)都是如下：

在PhotoViewAttacher 文件中 更改cleanup方法

// @SuppressWarnings("deprecation")// public final void cleanup() {// if (null != mImageView) {// mImageView.get().getViewTreeObserver().removeGlobalOnLayoutListener(this);// }// mViewTreeObserver = null;//// // Clear listeners too// mMatrixChangeListener = null;// mPhotoTapListener = null;// mViewTapListener = null;//// // Finally, clear ImageView// mImageView = null;// }@SuppressLint("NewApi")@SuppressWarnings("deprecation")public final void cleanup() {    if (VERSION.SDK_INT >= VERSION_CODES.JELLY_BEAN) {        if (null != mImageView) {            mImageView.get().getViewTreeObserver()                    .removeOnGlobalLayoutListener(this);        }        if (null != mViewTreeObserver && mViewTreeObserver.isAlive()) {            mViewTreeObserver.removeOnGlobalLayoutListener(this);            mViewTreeObserver = null;            // Clear listeners too            mMatrixChangeListener = null;            mPhotoTapListener = null;            mViewTapListener = null;            // Finally, clear ImageView            mImageView = null;        }    } else {        if (null != mImageView) {            mImageView.get().getViewTreeObserver()                    .removeGlobalOnLayoutListener(this);        }        if (null != mViewTreeObserver && mViewTreeObserver.isAlive()) {            mViewTreeObserver.removeGlobalOnLayoutListener(this);            mViewTreeObserver = null;            // Clear listeners too            mMatrixChangeListener = null;            mPhotoTapListener = null;            mViewTapListener = null;            // Finally, clear ImageView            mImageView = null;        }    }}

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实践之后，发现问题依旧，遂此种方法是不可行的，自己只能在github源项目上看看有没有遇到相同问题的人，果不其然，还真给我找到了。
针对此问题，该开源项目的作者chrisbanes的原话(链接)是：

Change getImageView() to log an error rather than throw an exception.

大意更改getImageView（）以log方式记录错误，而不是抛出异常。那么：

    public final ImageView getImageView() {    ImageView imageView = null;    if (null != mImageView) {        imageView = mImageView.get();    }    // If we don't have an ImageView, call cleanup()    if (null == imageView) {        cleanup();    //          throw new IllegalStateException(//此处经常抛异常，网上的解释是可能由于mImageView为弱引用的关系，对此，该开源框架PhotoView的创建人chrisbanes的建议是：Change getImageView() to log an error rather than throw an exception.    //                  "ImageView no longer exists. You should not use this PhotoViewAttacher any more.");        try {            throw new IllegalStateException(                    "ImageView no longer exists. You should not use this PhotoViewAttacher any more.");        } catch (Exception e) {            Log.w("PhotoViewAttacher", "[IllegalStateException] e = "+e.toString());        }    }    return imageView;}

按此方法更改后，再无此异常出现，欢迎大家指正