![String value in android | Whats is Integer, Boolean, Float, Double, Long Value in android studio #16 - YouTube String value in android | Whats is Integer, Boolean, Float, Double, Long Value in android studio #16 - YouTube](https://i.ytimg.com/vi/-YvkNPduD4M/maxresdefault.jpg)
String value in android | Whats is Integer, Boolean, Float, Double, Long Value in android studio #16 - YouTube
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Attempt to invoke virtual method boolean java.lang.String.equals(java.lang.Object) on a null object reference in android studio firebase mainactivity - Stack Overflow
![java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference · Issue #1 · KODDevYouTube/ChatAppTutorial · GitHub java.lang.NullPointerException: Attempt to invoke virtual method 'boolean java.lang.String.equals(java.lang.Object)' on a null object reference · Issue #1 · KODDevYouTube/ChatAppTutorial · GitHub](https://user-images.githubusercontent.com/36901298/47241173-67653600-d3f3-11e8-997b-a23aa79543bf.png)