Android Studio: New activity opens as blank screen

Have you set the layout for your activity in the line setContentView() like this. Here activity_second is the activity layout of my SecondActivity

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);
    }

if not then your activity will show up as blank. Hope this solves your problem.

It sometimes happens when instead of overloading

protected void onCreate(Bundle savedInstanceState) {

you end up overloading

public void onCreate(@Nullable Bundle savedInstanceState, @Nullable PersistableBundle persistentState) 

instead. Make sure the onCreate with only savedInstanceState as a argument is overloaded.