Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.example.android.bitmapfun.util.DiskLruCache.setCompressParams(android.graphics.Bitmap$CompressFormat, int)' on a null object reference

1. fetcher = new ImageFetcher(getActivity(), 100, 100);
   
2.                 ImageCacheParams params = new ImageCacheParams("main");
   
3.                 ImageCache cache = new ImageCache(getActivity(), params);
   
4.                 fetcher.setImageCache(cache);

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你双击一下空指针异常，看哪一行出错呢