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POHide a option from list preference
 

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  1. POHide a option from list preference
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    <p>I have a quite incomplete android project which settings option has a list preference. What i want to do is - permanently hide the character blacklist option from the list, but it will work internally. For this i did </p> <pre><code>&lt;EditTextPreference android:key="preference_character_blacklist" android:title="Character blacklist" android:visibility="gone"/&gt; </code></pre> <p>but it didn't work. Rather it showed error while i went to settings after running the project. The settings look like this-file:///home/Piyal/Desktop/Screenshot.png my preference.xml is-</p> <pre><code>&lt;PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"&gt; &lt;!-- GENERAL SETTINGS --&gt; &lt;PreferenceCategory android:title="General settings"&gt; &lt;CheckBoxPreference android:key="preference_capture_continuous" android:title="Continuous preview" android:entries="@array/capturemodes" /&gt; &lt;ListPreference android:title="Recognize" android:key="sourceLanguageCodeOcrPref" android:entries="@array/languagenames" android:entryValues="@array/iso6393" /&gt; &lt;/PreferenceCategory&gt; &lt;!-- TRANSLATION SETTINGS --&gt; &lt;PreferenceCategory android:title="Translation settings" &gt; &lt;CheckBoxPreference android:key="preference_translation_toggle_translation" android:title="Translate"/&gt; &lt;ListPreference android:key="targetLanguageCodeTranslationPref" android:title="Translate to" android:dependency="preference_translation_toggle_translation" android:entries="@array/translationtargetlanguagenames_google" android:entryValues="@array/translationtargetiso6391_google" /&gt; &lt;ListPreference android:key="preference_translator" android:title="Translator" android:dependency="preference_translation_toggle_translation" android:entries="@array/translators" android:entryValues="@array/translators" /&gt; &lt;/PreferenceCategory&gt; &lt;!-- ADVANCED SETTINGS --&gt; &lt;PreferenceCategory android:title="Advanced settings"&gt; &lt;ListPreference android:key="preference_ocr_engine_mode" android:title="OCR engine" android:entries="@array/ocrenginemodes" android:entryValues="@array/ocrenginemodes"/&gt; &lt;ListPreference android:key="preference_operator_mode" android:title="Operator" android:entries="@array/operatormodes" android:entryValues="@array/operatormodes" /&gt; &lt;CheckBoxPreference android:key="preferences_auto_focus" android:title="Autofocus"/&gt; &lt;CheckBoxPreference android:key="preferences_play_beep" android:title="Beep"/&gt; &lt;EditTextPreference android:key="preference_character_blacklist" android:title="Character blacklist"/&gt; &lt;EditTextPreference android:key="preference_character_whitelist" android:title="Character whitelist" /&gt; &lt;!-- &lt;CheckBoxPreference android:key="preference_toggle_light" android:title="Light"/&gt; --&gt; &lt;ListPreference android:key="preference_page_segmentation_mode" android:title="Page segmentation" android:entries="@array/pagesegmentationmodes" android:entryValues="@array/pagesegmentationmodes" /&gt; &lt;CheckBoxPreference android:key="preferences_reverse_image" android:title="Reversed camera image" android:summary="(For devices with only a front camera)"/&gt; &lt;/PreferenceCategory&gt; &lt;/PreferenceScreen&gt;` </code></pre> <p>Here is my preferenceacitivity-</p> <pre><code> public class PreferencesActivity extends PreferenceActivity implements OnSharedPreferenceChangeListener { // Preference keys not carried over from R.M Theis project project public static final String KEY_OPERATOR_MODE = "preference_operator_mode"; // Preference keys not carried over from ZXing project public static final String KEY_SOURCE_LANGUAGE_PREFERENCE = "sourceLanguageCodeOcrPref"; public static final String KEY_TARGET_LANGUAGE_PREFERENCE = "targetLanguageCodeTranslationPref"; public static final String KEY_TOGGLE_TRANSLATION = "preference_translation_toggle_translation"; public static final String KEY_CONTINUOUS_PREVIEW = "preference_capture_continuous"; public static final String KEY_PAGE_SEGMENTATION_MODE = "preference_page_segmentation_mode"; public static final String KEY_OCR_ENGINE_MODE = "preference_ocr_engine_mode"; public static final String KEY_CHARACTER_BLACKLIST = "preference_character_blacklist"; public static final String KEY_CHARACTER_WHITELIST = "preference_character_whitelist"; public static final String KEY_TOGGLE_LIGHT = "preference_toggle_light"; public static final String KEY_TRANSLATOR = "preference_translator"; // Preference keys carried over from ZXing project public static final String KEY_AUTO_FOCUS = "preferences_auto_focus"; public static final String KEY_HELP_VERSION_SHOWN = "preferences_help_version_shown"; public static final String KEY_NOT_OUR_RESULTS_SHOWN = "preferences_not_our_results_shown"; public static final String KEY_REVERSE_IMAGE = "preferences_reverse_image"; public static final String KEY_PLAY_BEEP = "preferences_play_beep"; public static final String KEY_VIBRATE = "preferences_vibrate"; public static final String TRANSLATOR_BING = "Bing Translator"; public static final String TRANSLATOR_GOOGLE = "Google Translate"; //private CheckBoxPreference checkBoxPreferenceContinuousPreview; private ListPreference listPreferenceSourceLanguage; //private CheckBoxPreference checkBoxTranslate; private ListPreference listPreferenceTargetLanguage; private ListPreference listPreferenceTranslator; private ListPreference listPreferenceOcrEngineMode; //private CheckBoxPreference checkBoxBeep; private EditTextPreference editTextPreferenceCharacterBlacklist; private EditTextPreference editTextPreferenceCharacterWhitelist; private ListPreference listPreferencePageSegmentationMode; //private CheckBoxPreference checkBoxReversedImage; private ListPreference listPreferenceOperatorMode; private static SharedPreferences sharedPreferences; /** * Set the default preference values. * * @param Bundle * savedInstanceState the current Activity's state, as passed by * Android */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); getWindow().setBackgroundDrawableResource(R.drawable.background_holo_dark); addPreferencesFromResource(R.xml.preferences); sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); //checkBoxPreferenceContinuousPreview = (CheckBoxPreference) getPreferenceScreen().findPreference(KEY_CONTINUOUS_PREVIEW); listPreferenceSourceLanguage = (ListPreference) getPreferenceScreen().findPreference(KEY_SOURCE_LANGUAGE_PREFERENCE); //checkBoxTranslate = (CheckBoxPreference) getPreferenceScreen().findPreference(KEY_TOGGLE_TRANSLATION); listPreferenceTargetLanguage = (ListPreference) getPreferenceScreen().findPreference(KEY_TARGET_LANGUAGE_PREFERENCE); listPreferenceTranslator = (ListPreference) getPreferenceScreen().findPreference(KEY_TRANSLATOR); listPreferenceOcrEngineMode = (ListPreference) getPreferenceScreen().findPreference(KEY_OCR_ENGINE_MODE); listPreferenceOperatorMode = (ListPreference) getPreferenceScreen().findPreference(KEY_OPERATOR_MODE); //checkBoxBeep = (CheckBoxPreference) getPreferenceScreen().findPreference(KEY_PLAY_BEEP); editTextPreferenceCharacterBlacklist = (EditTextPreference) getPreferenceScreen().findPreference(KEY_CHARACTER_BLACKLIST); editTextPreferenceCharacterWhitelist = (EditTextPreference) getPreferenceScreen().findPreference(KEY_CHARACTER_WHITELIST); listPreferencePageSegmentationMode = (ListPreference) getPreferenceScreen().findPreference(KEY_PAGE_SEGMENTATION_MODE); //checkBoxReversedImage = (CheckBoxPreference) getPreferenceScreen().findPreference(KEY_REVERSE_IMAGE); // Create the entries/entryvalues for the translation target language list. initTranslationTargetList(); } /** * Interface definition for a callback to be invoked when a shared * preference is changed. Sets summary text for the app's preferences. Summary text values show the * current settings for the values. * * @param sharedPreferences * the Android.content.SharedPreferences that received the change * @param key * the key of the preference that was changed, added, or removed */ @Override public void onSharedPreferenceChanged(SharedPreferences sharedPreferences, String key) { // Update preference summary values to show current preferences if (key.equals(KEY_TRANSLATOR)) { listPreferenceTranslator.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_TRANSLATOR)); } else if(key.equals(KEY_SOURCE_LANGUAGE_PREFERENCE)) { // Set the summary text for the source language name listPreferenceSourceLanguage. setSummary(LanguageCodeHelper.getOcrLanguageName(getBaseContext(), sharedPreferences.getString(key, CaptureActivity.DEFAULT_SOURCE_LANGUAGE_CODE))); // Retrieve the character blacklist/whitelist for the new language String blacklist = OcrCharacterHelper.getBlacklist(sharedPreferences, listPreferenceSourceLanguage.getValue()); String whitelist = OcrCharacterHelper.getWhitelist(sharedPreferences, listPreferenceSourceLanguage.getValue()); // Save the character blacklist/whitelist to preferences sharedPreferences.edit().putString(KEY_CHARACTER_BLACKLIST, blacklist).commit(); sharedPreferences.edit().putString(KEY_CHARACTER_WHITELIST, whitelist).commit(); // Set the blacklist/whitelist summary text editTextPreferenceCharacterBlacklist.setSummary(blacklist); editTextPreferenceCharacterWhitelist.setSummary(whitelist); } else if (key.equals(KEY_TARGET_LANGUAGE_PREFERENCE)) { listPreferenceTargetLanguage. setSummary(LanguageCodeHelper.getTranslationLanguageName(this, sharedPreferences.getString(key, CaptureActivity.DEFAULT_TARGET_LANGUAGE_CODE))); } else if (key.equals(KEY_PAGE_SEGMENTATION_MODE)) { listPreferencePageSegmentationMode.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_PAGE_SEGMENTATION_MODE)); } else if (key.equals(KEY_OCR_ENGINE_MODE)) { listPreferenceOcrEngineMode.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_OCR_ENGINE_MODE)); } else if (key.equals(KEY_OPERATOR_MODE)) { listPreferenceOperatorMode.setSummary(sharedPreferences.getString(key, CaptureActivity.DEFAULT_OPERATOR_MODE)); } else if (key.equals(KEY_CHARACTER_BLACKLIST)) { // Save a separate, language-specific character blacklist for this language OcrCharacterHelper.setBlacklist(sharedPreferences, listPreferenceSourceLanguage.getValue(), sharedPreferences.getString(key, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue()))); // Set the summary text editTextPreferenceCharacterBlacklist. setSummary(sharedPreferences.getString(key, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue()))); } else if (key.equals(KEY_CHARACTER_WHITELIST)) { // Save a separate, language-specific character blacklist for this language OcrCharacterHelper.setWhitelist(sharedPreferences, listPreferenceSourceLanguage.getValue(), sharedPreferences.getString(key, OcrCharacterHelper.getDefaultWhitelist(listPreferenceSourceLanguage.getValue()))); // Set the summary text editTextPreferenceCharacterWhitelist. setSummary(sharedPreferences.getString(key, OcrCharacterHelper.getDefaultWhitelist (listPreferenceSourceLanguage.getValue()))); } // Update the languages available for translation based on the current translator selected. if (key.equals(KEY_TRANSLATOR)) { initTranslationTargetList(); } } /** * Sets the list of available languages and the current target language for translation. Called * when the key for the current translator is changed. */ void initTranslationTargetList() { // Set the preference for the target language code, in case we've just switched from Google // to Bing, or Bing to Google. String currentLanguageCode = sharedPreferences.getString(KEY_TARGET_LANGUAGE_PREFERENCE, CaptureActivity.DEFAULT_TARGET_LANGUAGE_CODE); // Get the name of our language String currentLanguage = LanguageCodeHelper.getTranslationLanguageName(getBaseContext(), currentLanguageCode); String[] translators = getResources().getStringArray(R.array.translators); String translator = sharedPreferences.getString(KEY_TRANSLATOR, CaptureActivity.DEFAULT_TRANSLATOR); String newLanguageCode = ""; if (translator.equals(translators[0])) { // Bing // Update the list of available languages for the currently-chosen translation API. listPreferenceTargetLanguage. setEntries(R.array.translationtargetlanguagenames_microsoft); listPreferenceTargetLanguage. setEntryValues(R.array.translationtargetiso6391_microsoft); // Get the corresponding code for our language name newLanguageCode = TranslatorBing.toLanguage(currentLanguage); } else if (translator.equals(translators[1])) { // Google // Update the list of available languages for the currently-chosen translation API. listPreferenceTargetLanguage. setEntries(R.array.translationtargetlanguagenames_google); listPreferenceTargetLanguage. setEntryValues(R.array.translationtargetiso6391_google); // Get the corresponding code for our language name newLanguageCode = TranslatorGoogle.toLanguage(currentLanguage); } // Store the code as the target language preference String newLanguageName = LanguageCodeHelper. getTranslationLanguageName(getBaseContext(), newLanguageCode); listPreferenceTargetLanguage. setValue(newLanguageName); // Set the radio button in the list sharedPreferences.edit().putString(PreferencesActivity.KEY_TARGET_LANGUAGE_PREFERENCE, newLanguageCode).commit(); listPreferenceTargetLanguage.setSummary(newLanguageName); } /** * Sets up initial preference summary text * values and registers the OnSharedPreferenceChangeListener. */ @Override protected void onResume() { super.onResume(); // Set up the initial summary values listPreferenceTranslator. setSummary(sharedPreferences.getString(KEY_TRANSLATOR, CaptureActivity.DEFAULT_TRANSLATOR)); listPreferenceSourceLanguage. setSummary(LanguageCodeHelper.getOcrLanguageName(getBaseContext(), sharedPreferences.getString (KEY_SOURCE_LANGUAGE_PREFERENCE, CaptureActivity.DEFAULT_SOURCE_LANGUAGE_CODE))); listPreferenceTargetLanguage. setSummary(LanguageCodeHelper.getTranslationLanguageName(getBaseContext(), sharedPreferences.getString (KEY_TARGET_LANGUAGE_PREFERENCE, CaptureActivity.DEFAULT_TARGET_LANGUAGE_CODE))); listPreferencePageSegmentationMode. setSummary(sharedPreferences.getString(KEY_PAGE_SEGMENTATION_MODE, CaptureActivity.DEFAULT_PAGE_SEGMENTATION_MODE)); listPreferenceOcrEngineMode. setSummary(sharedPreferences.getString(KEY_OCR_ENGINE_MODE, CaptureActivity.DEFAULT_OCR_ENGINE_MODE)); listPreferenceOperatorMode. setSummary(sharedPreferences.getString(KEY_OPERATOR_MODE, CaptureActivity.DEFAULT_OPERATOR_MODE)); editTextPreferenceCharacterBlacklist. setSummary(sharedPreferences.getString(KEY_CHARACTER_BLACKLIST, OcrCharacterHelper.getDefaultBlacklist(listPreferenceSourceLanguage.getValue()))); editTextPreferenceCharacterWhitelist. setSummary(sharedPreferences.getString (KEY_CHARACTER_WHITELIST,OcrCharacterHelper.getDefaultWhitelist (listPreferenceSourceLanguage.getValue()))); // Set up a listener whenever a key changes getPreferenceScreen(). getSharedPreferences().registerOnSharedPreferenceChangeListener(this); } /** * Called when Activity is about to lose focus. Unregisters the * OnSharedPreferenceChangeListener. */ @Override protected void onPause() { super.onPause(); getPreferenceScreen(). getSharedPreferences().unregisterOnSharedPreferenceChangeListener(this); } } </code></pre> <p>`</p> <p>Stack trace after adding getPreferenceScreen().removePreference(editTextPreferenceCharacterBlacklist);</p> <p>in onCreate(). </p> <pre><code>05-30 17:42:00.546: E/AndroidRuntime(379): FATAL EXCEPTION: main 05-30 17:42:00.546: E/AndroidRuntime(379): java.lang.RuntimeException: Unable to start activity ComponentInfo{automated.card.recharge.ocr/automated.card. recharge.ocr.PreferencesActivity}: java.lang.NullPointerException 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.os.Handler.dispatchMessage(Handler.java:99) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.os.Looper.loop(Looper.java:123) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.main(ActivityThread.java:3683) 05-30 17:42:00.546: E/AndroidRuntime(379): at java.lang.reflect.Method.invokeNative(Native Method) 05-30 17:42:00.546: E/AndroidRuntime(379): at java.lang.reflect.Method.invoke(Method.java:507) 05-30 17:42:00.546: E/AndroidRuntime(379): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 05-30 17:42:00.546: E/AndroidRuntime(379): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-30 17:42:00.546: E/AndroidRuntime(379): at dalvik.system.NativeStart.main(Native Method) 05-30 17:42:00.546: E/AndroidRuntime(379): Caused by: java.lang.NullPointerException 05-30 17:42:00.546: E/AndroidRuntime(379): at android.preference.PreferenceGroup.removePreferenceInt(PreferenceGroup.java:181) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.preference.PreferenceGroup.removePreference(PreferenceGroup.java:174) 05-30 17:42:00.546: E/AndroidRuntime(379): at automated.card.recharge.ocr.PreferencesActivity.onCreate(PreferencesActivity.java:103) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 05-30 17:42:00.546: E/AndroidRuntime(379): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 05-30 17:42:00.546: E/AndroidRuntime(379): at dalvik.system.NativeStart.main(Native Method) 05-30 17:42:00.546: E/AndroidRuntime(379): Caused by: java.lang.NullPointerException 05-30 17:42:00.546: E/AndroidRuntime(379): at android.preference.PreferenceGroup.removePreferenceInt(PreferenceGroup.java:181) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.preference.PreferenceGroup.removePreference(PreferenceGroup.java:174) 05-30 17:42:00.546: E/AndroidRuntime(379): at automated.card.recharge.ocr.PreferencesActivity.onCreate(PreferencesActivity.java:103) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 05-30 17:42:00.546: E/AndroidRuntime(379): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) </code></pre>
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