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2013-05-28T14:40:59.787
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2013-05-30T13:51:51.580
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2013-05-30T13:51:51.580
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You should be able to remove: <pre><code><EditTextPreference android:key="preference_character_blacklist" android:title="Character blacklist" android:visibility="gone"/> </code></pre> from your preferences.xml. This will stop it from appearing in the Settings menu. For the setting to work internally I would suggest reading into <a href="http://developer.android.com/reference/android/content/SharedPreferences.html" rel="nofollow">SharedPreferences</a>. The <a href="http://developer.android.com/guide/topics/data/data-storage.html#pref" rel="nofollow">Android Storage Options Guide</a> will explain how you can store and retrieve setting values using <code>SharedPreferences</code>. I've modified the following example to store a string from the guide linked above: <pre><code>public class Calc extends Activity { public static final String PREFS_NAME = "MyPrefsFile"; @Override protected void onCreate(Bundle state){ super.onCreate(state); . . . // Restore preferences SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); String silent = settings.getString("character_blacklist", ""); } @Override protected void onStop(){ super.onStop(); // We need an Editor object to make preference changes. // All objects are from android.context.Context SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0); SharedPreferences.Editor editor = settings.edit(); //Some test characters for the blacklist mBlackListChars = "a,g,t,h,f"; editor.putString("character_blacklist", mBlackListChars); // Commit the edits editor.commit(); } } </code></pre> Please note you will probably want to call these methods outside of <code>onCreate()</code> and <code>onStop()</code>, this is purely for illustration. In addition I'll draw your attention to the fact <code>SharedPreferences</code> can handle a <code>StringSet</code> which may be useful to you in storing multiple characters. See the <code>getStringSet()</code> method in <code>SharedPreferences</code>. UPDATE In order to keep the preference but just hide it from the user you could remove it programatically. Seems like a bit of a hack but consider adding this to your 'OnCreate()' in your 'PreferenceActivity' <pre><code>getPreferenceScreen().removePreference(editTextPreferenceCharacterBlacklist); </code></pre> UPDATE Looks like your problem is caused by editTextPreferenceCharacterBlacklist being null. Problem because it's not been set to your instance variable at the point you are running the line I specified. You could try finding it as follows: <code>getPreferenceScreen().removePreference(getPreferenceScreen().findPreference(KEY_CHARACTER_BLACKLIST));</code>
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