Revert "Remove "Personal dictionary" link from settings."

This reverts commit 76de0a8f52.

Bug 21881199.

Change-Id: I53f42a1e8f25d214de97264f4d25813bc637cafa

java/res/xml/prefs_screen_correction.xml

@@ -19,6 +19,11 @@
     xmlns:latin="http://schemas.android.com/apk/res/com.android.inputmethod.latin"
     android:title="@string/settings_screen_correction"
     android:key="screen_correction">
+    <PreferenceScreen
+        android:key="edit_personal_dictionary"
+        android:title="@string/edit_personal_dictionary">
+        <intent android:action="android.settings.USER_DICTIONARY_SETTINGS" />
+    </PreferenceScreen>
     <PreferenceScreen
         android:key="configure_dictionaries_key"
         android:title="@string/configure_dictionaries_title">

java/src/com/android/inputmethod/latin/settings/CorrectionSettingsFragment.java

@@ -16,20 +16,27 @@
 
 package com.android.inputmethod.latin.settings;
 
+import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.pm.PackageManager;
+import android.content.pm.ResolveInfo;
 import android.os.Build;
 import android.os.Bundle;
 import android.preference.Preference;
 
 import com.android.inputmethod.dictionarypack.DictionarySettingsActivity;
 import com.android.inputmethod.latin.R;
+import com.android.inputmethod.latin.userdictionary.UserDictionaryList;
+import com.android.inputmethod.latin.userdictionary.UserDictionarySettings;
+
+import java.util.TreeSet;
 
 /**
  * "Text correction" settings sub screen.
  *
  * This settings sub screen handles the following text correction preferences.
+ * - Personal dictionary
  * - Add-on dictionaries
  * - Block offensive words
  * - Auto-correction
@@ -59,5 +66,39 @@ public final class CorrectionSettingsFragment extends SubScreenFragment {
         if (0 >= number) {
             removePreference(Settings.PREF_CONFIGURE_DICTIONARIES_KEY);
         }
+
+        final Preference editPersonalDictionary =
+                findPreference(Settings.PREF_EDIT_PERSONAL_DICTIONARY);
+        final Intent editPersonalDictionaryIntent = editPersonalDictionary.getIntent();
+        final ResolveInfo ri = USE_INTERNAL_PERSONAL_DICTIONARY_SETTINGS ? null
+                : pm.resolveActivity(
+                        editPersonalDictionaryIntent, PackageManager.MATCH_DEFAULT_ONLY);
+        if (ri == null) {
+            overwriteUserDictionaryPreference(editPersonalDictionary);
+        }
+    }
+
+    private void overwriteUserDictionaryPreference(final Preference userDictionaryPreference) {
+        final Activity activity = getActivity();
+        final TreeSet<String> localeList = UserDictionaryList.getUserDictionaryLocalesSet(activity);
+        if (null == localeList) {
+            // The locale list is null if and only if the user dictionary service is
+            // not present or disabled. In this case we need to remove the preference.
+            getPreferenceScreen().removePreference(userDictionaryPreference);
+        } else if (localeList.size() <= 1) {
+            userDictionaryPreference.setFragment(UserDictionarySettings.class.getName());
+            // If the size of localeList is 0, we don't set the locale parameter in the
+            // extras. This will be interpreted by the UserDictionarySettings class as
+            // meaning "the current locale".
+            // Note that with the current code for UserDictionaryList#getUserDictionaryLocalesSet()
+            // the locale list always has at least one element, since it always includes the current
+            // locale explicitly. @see UserDictionaryList.getUserDictionaryLocalesSet().
+            if (localeList.size() == 1) {
+                final String locale = (String)localeList.toArray()[0];
+                userDictionaryPreference.getExtras().putString("locale", locale);
+            }
+        } else {
+            userDictionaryPreference.setFragment(UserDictionaryList.class.getName());
+        }
     }
 }

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

@@ -56,6 +56,7 @@ public final class Settings implements SharedPreferences.OnSharedPreferenceChang
     // PREF_VOICE_MODE_OBSOLETE is obsolete. Use PREF_VOICE_INPUT_KEY instead.
     public static final String PREF_VOICE_MODE_OBSOLETE = "voice_mode";
     public static final String PREF_VOICE_INPUT_KEY = "pref_voice_input_key";
+    public static final String PREF_EDIT_PERSONAL_DICTIONARY = "edit_personal_dictionary";
     public static final String PREF_CONFIGURE_DICTIONARIES_KEY = "configure_dictionaries_key";
     // PREF_AUTO_CORRECTION_THRESHOLD_OBSOLETE is obsolete. Use PREF_AUTO_CORRECTION instead.
     public static final String PREF_AUTO_CORRECTION_THRESHOLD_OBSOLETE =