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Aleksander Aleksic7,965 Points
I see you use Lambda in the onClick method, but when i trie to use it i get an compile error. Any idea ?
Seth Kroger56,407 Points
You can't use lambda's in in Android code just yet, since Android only officially supports Java 7, so far, not 8. So you will need to use one of the other methods like an anonymous inner class, etc.
Now Android Studio does do something called "code folding" where it will simplify the display of the code. Things like showing the string used from the string.xml file in place of R.string.whatever. They'll be highlighted but when you click to edit them they show the actual code. One of the "foldings" is to show an 1-method anonymous inner class in lambda notation instead. You can see in the video at 4:20 where Ben explains what AS is doing there.
Please provide your code and the error log.