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Need help with android studio

 
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Hi there!
Trying to learn the very basic of this but been struggling really hard a couple of days now.

I have made up some simple buttons just to try its function but just get this result: "unfortunately, myCalculator has stopped" when pressing any button on the virtual device.







Another thing is that every time I run any virtual device my discspace reduces by somewhere around 500MB-1GB each time. Cant find any way to "clean" or restore that space..


 
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1) You buttonClick() method should be buttonClick(View view).
2) As of your second problem, this is strange. Does your disc space remain in use even after the emulator is closed.
 
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