Eliminating getLayoutResId() in favor of setContentView(R.layout.activity_masterdetail);

Android Programming (3rd Edition) 17. Two-Pane Master-Detail Interfaces
1

Calling setContentView(R.layout.activity_masterdetail) in SingleFragmentActivity will produce the same result as calling protected int getLayoutResId() { return R.layout.activity_masterdetail; } in CrimeListActivity. Isn’t this redundant since the device will configure our layout depending on the screen dimension?

2

The class SingleFragmentActivity will be the super class of CrimeListActivity as well as other classes such as DatePickerActivity in this project.

The following methods in SingleFragmentActivity will make it a common one for all its child classes.

    @LayoutRes
    protected int getLayoutResId() {
        return R.layout.activity_fragment;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutResId());

        // ......
    }