Update README.md

AweiLoveAndroid · Apr 16, 2018 · 4840ffd · 4840ffd
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 * **[Android中的冷门知识点汇总](https://github.com/AweiLoveAndroid/CommonDevKnowledge/blob/master/Android%E4%B8%AD%E7%9A%84%E5%86%B7%E9%97%A8%E7%9F%A5%E8%AF%86%E7%82%B9%E6%B1%87%E6%80%BB/Android%E4%B8%AD%E7%9A%84%E5%86%B7%E9%97%A8%E7%9F%A5%E8%AF%86%E6%B1%87%E6%80%BB.md)**
 
+* **[双击back退出app](https://github.com/AweiLoveAndroid/CommonDevKnowledge/blob/master/%E5%8F%8C%E5%87%BBback%E9%80%80%E5%87%BAapp/%E5%8F%8C%E5%87%BBback%E9%80%80%E5%87%BAapp.md)**
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 * **应用角标的实现（待完善）**
 
 * **利用原生api实现分享等功能（待完善）**
 
 * **二维码处理（待完善）**
 
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 # 赞赏