Yesterday my laptop got turned off, because I forget to plug it to the power source.
Now I turn on my laptop and see an error in the bottom of the Run windows, when I attempt to run my project:
Error:Cannot find android.app.Activity class
And I tested this and this way can't solve my problem Android Hello World in IntelliJ 12 - Cannot find android.app.Activity class
Edit: i use this answer, and it's work for me:
maybe invalidate IDEA cache could help? Files -> Invalidate cache and restart -> Invalidate and restart
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