Remove irrelevant options.

Bug: 6667355
Change-Id: I39b6db17fb52e80f510cf6462f41d9cb1f8e0341

java/res/xml/prefs.xml

@@ -122,7 +122,6 @@
                 android:defaultValue="true" />
             <CheckBoxPreference
                 android:key="next_word_prediction"
-                android:dependency="next_word_suggestion"
                 android:title="@string/bigram_prediction"
                 android:summary="@string/bigram_prediction_summary"
                 android:persistent="true"

java/src/com/android/inputmethod/latin/Settings.java

@@ -149,10 +149,13 @@ public class Settings extends InputMethodSettingsFragment
             generalSettings.removePreference(mVoicePreference);
         }
 
+        final PreferenceGroup advancedSettings =
+                (PreferenceGroup) findPreference(PREF_ADVANCED_SETTINGS);
+        // Remove those meaningless options for now. TODO: delete them for good
+        advancedSettings.removePreference(findPreference(PREF_BIGRAM_SUGGESTION));
+        advancedSettings.removePreference(findPreference(PREF_KEY_ENABLE_SPAN_INSERT));
         if (!VibratorUtils.getInstance(context).hasVibrator()) {
             generalSettings.removePreference(findPreference(PREF_VIBRATE_ON));
-            final PreferenceGroup advancedSettings =
-                    (PreferenceGroup) findPreference(PREF_ADVANCED_SETTINGS);
             if (null != advancedSettings) { // Theoretically advancedSettings cannot be null
                 advancedSettings.removePreference(findPreference(PREF_VIBRATION_DURATION_SETTINGS));
             }

java/src/com/android/inputmethod/latin/SettingsValues.java

@@ -135,8 +135,8 @@ public class SettingsValues {
                 && isBigramSuggestionEnabled(prefs, res, mAutoCorrectEnabled);
         mBigramPredictionEnabled = mBigramSuggestionEnabled
                 && isBigramPredictionEnabled(prefs, res);
-        mEnableSuggestionSpanInsertion =
-                prefs.getBoolean(Settings.PREF_KEY_ENABLE_SPAN_INSERT, true);
+        // TODO: remove mEnableSuggestionSpanInsertion. It's always true.
+        mEnableSuggestionSpanInsertion = true;
         mVibrationDurationSettingsRawValue =
                 prefs.getInt(Settings.PREF_VIBRATION_DURATION_SETTINGS, -1);
         mKeypressSoundVolumeRawValue = prefs.getFloat(Settings.PREF_KEYPRESS_SOUND_VOLUME, -1.0f);
@@ -242,13 +242,8 @@ public class SettingsValues {
 
     private static boolean isBigramSuggestionEnabled(final SharedPreferences sp,
             final Resources resources, final boolean autoCorrectEnabled) {
-        final boolean showBigramSuggestionsOption = resources.getBoolean(
-                R.bool.config_enable_next_word_suggestions_option);
-        if (!showBigramSuggestionsOption) {
-            return autoCorrectEnabled;
-        }
-        return sp.getBoolean(Settings.PREF_BIGRAM_SUGGESTION, resources.getBoolean(
-                R.bool.config_default_next_word_suggestions));
+        // TODO: remove this method. Bigram suggestion is always true.
+        return true;
     }
 
     private static boolean isBigramPredictionEnabled(final SharedPreferences sp,