This allows users to set splash layouts in the Activities' onCreate method
by passing their splash view to setContentView in onCreate.

```java
public class MainActivity extends NavigationActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        View splash = new View(this);
        splash.setBackgroundColor(Color.RED);
        setContentView(splash);
    }
}
```