java.lang.IllegalStateException:

Caused by: java.lang.IllegalStateException: Cannot pool recycled bitmap
        at com.bumptech.glide.load.engine.bitmap_recycle.LruBitmapPool.put(LruBitmapPool.java:86)
        at com.bumptech.glide.load.resource.bitmap.BitmapResource.recycle(BitmapResource.java:57)
        at com.bumptech.glide.load.engine.EngineResource.recycle(EngineResource.java:63)
        at com.bumptech.glide.load.engine.ResourceRecycler.recycle(ResourceRecycler.java:28)
        at com.bumptech.glide.load.engine.Engine.onResourceReleased(Engine.java:319)
        at com.bumptech.glide.load.engine.EngineResource.release(EngineResource.java:101)
        at com.bumptech.glide.load.engine.Engine.release(Engine.java:275)
        at com.bumptech.glide.request.SingleRequest.releaseResource(SingleRequest.java:290)
        at com.bumptech.glide.request.SingleRequest.clear(SingleRequest.java:269)
        at com.bumptech.glide.manager.RequestTracker.clearRemoveAndRecycle(RequestTracker.java:62)
        at com.bumptech.glide.RequestManager.untrack(RequestManager.java:437)
        at com.bumptech.glide.RequestManager.untrackOrDelegate(RequestManager.java:424)
        at com.bumptech.glide.RequestManager.clear(RequestManager.java:412)
        at com.bumptech.glide.RequestManager.onDestroy(RequestManager.java:272)
        at com.bumptech.glide.manager.ActivityFragmentLifecycle.onDestroy(ActivityFragmentLifecycle.java:64)
        at com.bumptech.glide.manager.SupportRequestManagerFragment.onDestroy(SupportRequestManagerFragment.java:187)
        at android.support.v4.app.Fragment.performDestroy(Fragment.java:2609)
        at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1557)

参考文献：https://www.jianshu.com/p/e7204506a9bb

Glide源码：

@Override
  public synchronized void put(Bitmap bitmap) {
    if (bitmap == null) {
      throw new NullPointerException("Bitmap must not be null");
    }
    if (bitmap.isRecycled()) {
      throw new IllegalStateException("Cannot pool recycled bitmap");
    }
    if (!bitmap.isMutable() || strategy.getSize(bitmap) > maxSize
        || !allowedConfigs.contains(bitmap.getConfig())) {
      bitmap.recycle();
      return;
    }
    final int size = strategy.getSize(bitmap);
    strategy.put(bitmap);//存入LruPoolStrategy中
    tracker.add(bitmap);
    puts++;
    currentSize += size;
    dump();//输出log信息
    evict();//根据currentSize计算是否超出maxSize，是则进行末位回收
  }

通过阅读源码，第二个语句

if (bitmap.isRecycled()) {
      throw new IllegalStateException("Cannot pool recycled bitmap");
}

大致意思是用来加载的bitmap被回收了，所以会报异常，按照这个思路，我检查自己的代码，发现确实当界面销毁的时候，我们的代码在Glide之前，主动回收了Bitmap，所以导致抛异常，所以解决办法很简单，只需要把自己主动回收的代码去除就好

如果你的代码也出现此问题，只需要搜索主动回收的代码recycle，注释掉即可，或者别用Glide，至于被回收会报异常出来，代码君还未读Glide里面的源码，不敢过分解读~，有了解的小伙伴可以在评论区里答疑一下