Sync setting disabled if no account.

Bug: 19361223

Change-Id: Id5e8d34920f5bf3bffb6d6d287557e85d7b72c79

java/res/values/strings.xml

@@ -61,7 +61,7 @@
     <!-- Option summary when cloud sync feature is disabled  [CHAR LIMIT=65] -->
     <string name="cloud_sync_summary_disabled">Sync your personal dictionary across devices</string>
     <!-- Option title for starting the sync cycle now. [CHAR LIMIT=33]-->
-    <string name="sync_now_title">Sync Now</string>
+    <string name="sync_now_title">Sync now</string>
     <!-- Option title for letting user delete data from Google servers.  [CHAR LIMIT=33] -->
     <string name="clear_sync_data_title">Delete Keyboard Cloud data</string>
     <!-- Option summary for letting user delete data from Google servers. [CHAR LIMIT=65] -->
@@ -73,11 +73,15 @@
     <!-- Option to cancel the deletion of user data from cloud [CHAR LIMIT=20] -->
     <string name="cloud_sync_cancel">Cancel</string>
     <!-- Option to agree to terms and conditions for enabling cloud sync feature. -->
-    <string name="cloud_sync_opt_in_text">Your personal dictionary will be synced &amp; backed up to
+    <string name="cloud_sync_opt_in_text">Your personal dictionary will be synced and backed up to
         Google servers. The statistical information of word frequency may be collected to help
         improve our products. The collection and usage of all the information will be compliant with
         <a href="https://www.google.com/policies/privacy">Google\'s Privacy Policy</a>.
     </string>
+    <!-- Text to tell the user to add a Google account to the device to enable the cloud sync feature. [CHAR LIMIT=65]-->
+    <string name="add_account_to_enable_sync">
+        Please add a Google account to this device to enable this feature
+    </string>
 
     <!-- Option name for including other IMEs in the language switch list [CHAR LIMIT=30] -->
     <string name="include_other_imes_in_language_switch_list">Switch to other input methods</string>

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

@@ -204,10 +204,33 @@ public final class AccountsSettingsFragment extends SubScreenFragment {
      * is currently selected.
      */
     private void refreshAccountAndDependentPreferences(@Nullable final String currentAccount) {
+        // TODO(cvnguyen): Write tests.
         if (!ProductionFlags.ENABLE_ACCOUNT_SIGN_IN) {
             return;
         }
 
+        final String[] accountsForLogin =
+                LoginAccountUtils.getAccountsForLogin(getActivity());
+
+        if (accountsForLogin.length > 0) {
+            enableSyncPreferences();
+            mAccountSwitcher.setOnPreferenceClickListener(new OnPreferenceClickListener() {
+                @Override
+                public boolean onPreferenceClick(final Preference preference) {
+                    if (accountsForLogin.length > 0) {
+                        // TODO: Add addition of account.
+                        createAccountPicker(accountsForLogin, currentAccount,
+                                new AccountChangedListener(null)).show();
+                    }
+                    return true;
+                }
+            });
+        } else {
+            mAccountSwitcher.setEnabled(false);
+            disableSyncPreferences();
+            mEnableSyncPreference.setSummary(getString(R.string.add_account_to_enable_sync));
+        }
+
         if (currentAccount == null) {
             // No account is currently selected; switch enable sync preference off.
             mAccountSwitcher.setSummary(getString(R.string.no_accounts_selected));
@@ -216,20 +239,6 @@ public final class AccountsSettingsFragment extends SubScreenFragment {
             // Set the currently selected account as the summary text.
             mAccountSwitcher.setSummary(getString(R.string.account_selected, currentAccount));
         }
-
-        mAccountSwitcher.setOnPreferenceClickListener(new OnPreferenceClickListener() {
-                @Override
-                public boolean onPreferenceClick(final Preference preference) {
-                    final String[] accountsForLogin =
-                            LoginAccountUtils.getAccountsForLogin(getActivity());
-                    if (accountsForLogin.length > 0) {
-                        // TODO: Add addition of account.
-                        createAccountPicker(accountsForLogin, currentAccount,
-                                new AccountChangedListener(null)).show();
-                    }
-                    return true;
-                }
-        });
     }
 
     @Nullable