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Android例子----View、指纹、Canvas、RecyclerView、BottomSheet、PopupWindow、Broadcast、Service、Rxjava、Retrofit、Handler等

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Attempt to invoke virtual method 'int android.view.View.getTop()' on a null object reference

在雙列表連動的頁面 來回快速滑動左右兩個列表時, 會有機會產生如下圖的錯誤 ![001](https://user-images.githubusercontent.com/23090085/45334138-0fddda00-b5ac-11e8-8131-506e7cc66e4a.png) 至於解決這個錯誤, 我目前使用的是如下圖的方式, 添加判斷來避免錯誤產生 ![002](https://user-images.githubusercontent.com/23090085/45334280-b4601c00-b5ac-11e8-8419-6e3404ca89ae.png) 不過我不太清楚為什麼會產生了這個錯誤, 有人知道嗎? 謝謝

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Android例子----View、指纹、Canvas、RecyclerView、BottomSheet、PopupWindow、Broadcast、Service、Rxjava、Retrofit、Handler等

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