IntelliJ IDEA: Boolean method XX is always inverted

try to return false if bluetoothAdapter is null otherwise return the output of isEnabled()

public static boolean isBlueToothEnabled(){
    final BluetoothAdapter bluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
    if(bluetoothAdapter == null){
        return false;
    }
    return bluetoothAdapter.isEnabled();
}

Read more:

In Clean Code, Robert Martin writes, “Negatives are just a bit harder
to understand than positives. So, when possible, conditionals should
be expressed as positives.” (Martin, [G29]). IntelliJ IDEA has three
inspections to help you stay positive.

https://blog.jetbrains.com/idea/2014/09/the-inspection-connection-issue-2/
(Entry #4 Avoiding negative Conditionals)

https://www.jetbrains.com/help/idea/2016.1/invert-boolean.html