Your content must have a ListView whose id attribute is 'android.R.id.list'

Question

I have created an xml file like this:

Answer 1

Exact way I fixed this based on feedback above since I couldn't get it to work at first:

activity_main.xml:

MainActivity.java:

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addPreferencesFromResource(R.xml.preferences);

preferences.xml: