The OnSharedPreferenceChangeListener
gets garbage collected in your case if you use an anonymous class.
To solve that problem use the following code in PreferenceActivity
to register and unregister a change listener:
public class MyActivity extends PreferenceActivity implements
OnSharedPreferenceChangeListener {
@Override
protected void onResume() {
super.onResume();
// Set up a listener whenever a key changes
getPreferenceScreen().getSharedPreferences()
.registerOnSharedPreferenceChangeListener(this);
}
@Override
protected void onPause() {
super.onPause();
// Unregister the listener whenever a key changes
getPreferenceScreen().getSharedPreferences()
.unregisterOnSharedPreferenceChangeListener(this);
}
public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,String key)
{
// do stuff
}
Furthermore be aware that the listener only gets called if the actual value changes. Setting the same value again will not fire the listener.
see also SharedPreferences.onSharedPreferenceChangeListener not being called consistently