获得zomato过滤器包时出现Kotlin空指针异常

Question

我有按钮。通过单击此按钮，将打开图像过滤器片段：

  filters_menu.setOnClickListener(object : View.OnClickListener {
            override fun onClick(v: View?) {

                imageFiltersFragment!!.listener = this@MainActivity
              /*  var fragmentTransaction=supportFragmentManager.beginTransaction().replace(R.id.content_area,imageFiltersFragment).commit()*/
                imageFiltersFragment!!.show(supportFragmentManager, imageFiltersFragment!!.tag)
            }
        })

然后我们获得了过滤器包过滤器缩略图，显示了imageview的位图：

var filters = FilterPack.getFilterPack(activity!!) as MutableList
            for (f in filters) {
                val item = ThumbnailItem()
                item.image = thumbImg
                item.filter = f
                item.filterName = f.name
                ThumbnailsManager.addThumb(item)
                Log.d("filterpack", f.name)
            }
            thumbnailList!!.addAll(ThumbnailsManager.processThumbs(activity))
            activity!!.runOnUiThread {

                thumbnailAdapter.notifyDataSetChanged()

            }
        }

        Thread(runnable).start() 

使用默认图像效果很好。 但是当我从图库中打开图片时，它在var filters = FilterPack.getFilterPack(activity!!) as MutableList

处显示空指针异常