Professional Android 4 Application Development

Introducing the Preference Framework and the Preference Activity x 231
saves changes. Note that once again you are creating a new Thread on which to execute the
earthquake refresh code.
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == SHOW_PREFERENCES)
if (resultCode == Activity.RESULT_OK) {
updateFromPreferences();
FragmentManager fm = getFragmentManager();
final EarthquakeListFragment earthquakeList =
(EarthquakeListFragment)fm.findFragmentById(R.id.EarthquakeListFragment);
}
}
Thread t = new Thread(new Runnable() {
public void run() {
earthquakeList.refreshEarthquakes();
}
});
t.start();
16. Finally, call updateFromPreferences in onCreate of the Earthquake Activity to ensure the
preferences are applied when the Activity starts:
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
updateFromPreferences();
All code snippets in this example are part of the Chapter 7 Earthquake Part 1
project, available for download at www.wrox.com.
INTRODUCING THE PREFERENCE FRAMEWORK AND THE
PREFERENCE ACTIVITY
Android offers an XML-driven framework to create system-style Preference Screens for your applications.
By using this framework you can create Preference Activities that are consistent with those
used in both native and other third-party applications.
This has two distinct advantages:
‰ Users will be familiar with the layout and use of your settings screens.
‰ You can integrate settings screens from other applications (including system settings such as
location settings) into your application’s preferences.