Error "no Static Method Isctrlpressed" In Android

Yesterday I've upgraded my android studio from 2.2.3 to 2.3. Then get a error Error:The SDK Build Tools revision (24.0.2) is too low for project ':app'. Minimum required is 25.0.

Solution 1:

OP's problem was caused when tapping the hardware back button when subclassing AppCompatActivity. The workaround was to subclass the Activity class.