I am experiencing something strange with a Live Wallpaper. I very
closely followed several examples out there on Live Wallpapers in
regards to shared preference settings (e.g. Android sample app Cube
Live Wallpaper).
The Engine implements
SharedPreferences.OnSharedPreferenceChangeListener and the pertienent
code in Engine looks like this:
public static final String PREFS_NAME = "some-name";
Engine() {
prefs = LiveWallpaperService.this.getSharedPreferences(PREFS_NAME,
0);
prefs.registerOnSharedPreferenceChangeListener(this);
}
public void onSharedPreferenceChanged(SharedPreferences
sharedPreferences, String key) {
Log.e(getClass().getSimpleName(), "on shared preference
changed");
}
NOTE: I never unregister the Engine instance as a shared prefs
listener. Although, I did move some things around to onCreate and
onDestroy (added the unregister there) and had no impact as far as I
could tell.
The Settings class extends PreferenceActivity and implements
SharedPreferences.OnSharedPreferenceChangeListener as well. And since
that class has little code here is the body:
@Override
protected void onCreate(Bundle icicle) {
super.onCreate(icicle);
getPreferenceManager().setSharedPreferencesName(Engine.PREFS_NAME);
addPreferencesFromResource(R.xml.settings);
getPreferenceManager().getSharedPreferences().registerOnSharedPreferenceChangeListener(this);
}
@Override
protected void onDestroy() {
getPreferenceManager().getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this);
super.onDestroy();
}
public void onSharedPreferenceChanged(SharedPreferences
sharedPreferences, String key) {
Log.e(getClass().getSimpleName(), "on shared preference
changed");
}
The only thing coming out in the log is from the Settings class for on
shared pref change. Anyone have any idea why?
In the implementations I've found for Live Wallpaper shared prefs
settings, the Engine constructor either uses the shared preferences or
calls to onSharedPreferenceChanged() directly. It seems like those
other examples may be experiencing the same thing I described above,
and they worked around it!?!?
I do admit I have not taken the example code from others and tried it
out to see if the Engine onSharedPreferenceChanged() gets called. I
will do that tonight or this weekend.
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