findViewById not working for an include?

Question

I have an include like:

The include layout looks like (te

Answer 1

I had the same problem. I found out that I used a wrong function with the same name with 2 parameters as following:

public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) {
    super.onCreate(savedInstanceState, persistentState);
    setContentView(R.layout.activity_ble_connecting);
    //findViewByid() => wrong
} 

correct function with only one parameters:

    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ble_connecting);
        //findViewByid() => correct
    }