I found that if I implement implements
SharedPreferences.OnSharedPreferenceChangeListener, inside the implemented
method, findViewById works. Why is this?
public class SettingsActivity extends Activity implements SharedPreferences.
OnSharedPreferenceChangeListener{
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Display the fragment as the main content.
getFragmentManager().beginTransaction()
.replace(android.R.id.content, new SettingsFragment( this ))
.commit();
SharedPreferences sp = PreferenceManager.getDefaultSharedPreferences
( this );
sp.registerOnSharedPreferenceChangeListener( this );
}
@Override
public void onSharedPreferenceChanged(SharedPreferences
sharedPreferences, String key) {
if ( key.equals( "pref_catalogEdition" ) ) {
ProgressBar bar = ( ProgressBar ) findViewById(
R.id.catalogLoadProgressBar
);
bar.setVisibility(View.VISIBLE ); // WORKS!
}
}
}
On Tuesday, September 30, 2014 3:23:05 PM UTC-7, Qoheleth wrote:
>
> As suggested by the docs if using Android 3.0+, I used a Preference
> fragment which is used by an Activity that uses getFragmentManager to
> implement Preferences. My question is, how do you get the (root?) View of a
> Preference layout?
> In both SettingsActivity and SettingsFragment, findViewById and getView
> both return null, which probably means that the preference layout view is
> null, but somehow there is a layout.
>
> I also have a custom preference, CustomCatalogListPreference. What I'm
> trying to do is gain access to a progress bar that is part of the custom
> preference, but findViewById or getView both return null.
>
> public class SettingsActivity extends Activity {
>
> @Override
> protected void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
>
> // Display the fragment as the main content.
> getFragmentManager().beginTransaction()
> .replace(android.R.id.content, new SettingsFragment( this
> ))
> .commit();
> }
> }
>
> public class SettingsFragment extends PreferenceFragment {
> public static final String ABILITY_SCORES_KEY = "pref_score";
> public static final String SAVING_THROW_KEY = "pref_saveThrow";
> Context mContext;
>
> public SettingsFragment( Context ctx ) {
> mContext = ctx;
> }
>
> @Override
> public void onCreate(Bundle savedInstanceState) {
> super.onCreate(savedInstanceState);
>
> // Load the preferences from an XML resource
> addPreferencesFromResource( R.xml.preferences );
> }
> }
>
> public class CustomCatalogListPreference extends ListPreference {
>
> Context mContext;
>
> public CustomCatalogListPreference( Context context, AttributeSet
> attrs ) {
> super( context, attrs );
> mContext = context;
> }
>
> public CustomCatalogListPreference( Context context ) {
> super(context);
> mContext = context;
> }
>
> @Override
> public View onCreateView( ViewGroup parent ) {
> super.onCreateView( parent );
> LayoutInflater inflater = ( LayoutInflater ) mContext.
> getSystemService( Context.LAYOUT_INFLATER_SERVICE );
> return inflater.inflate( R.layout.custpref_catalog_list, null );
> }
>
> @Override
> protected void onBindView( View view ) {
> super.onBindView( view );
> }
>
>
>
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