Add ImportantNoticeUtils class

Bug: 10587358
Change-Id: I76673b47aab1579cc1310b6a978d04f874d5bcfe

java/src/com/android/inputmethod/latin/utils/ImportantNoticeUtils.java

+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin.utils;
+
+import android.content.Context;
+import android.content.SharedPreferences;
+import android.provider.Settings;
+import android.provider.Settings.SettingNotFoundException;
+import android.util.Log;
+
+public final class ImportantNoticeUtils {
+    private static final String TAG = ImportantNoticeUtils.class.getSimpleName();
+
+    // The current version number of an important notice.
+    // This number must be incremented whenever users should see a new important notice.
+    private static final int CURRENT_IMPORTANT_NOTICE_VERSION = 0;
+
+    // {@link SharedPreferences} name to save the last important notice version that has been
+    // displayed to users.
+    private static final String PREFERENCE_NAME = "important_notice";
+    private static final String KEY_IMPORTANT_NOTICE_VERSION = "important_notice_version";
+
+    // Copy of the hidden {@link Settings.Secure#USER_SETUP_COMPLETE} settings key.
+    // The value is zero until each multiuser completes system setup wizard.
+    // Caveat: This is a hidden API.
+    private static final String Settings_Secure_USER_SETUP_COMPLETE = "user_setup_complete";
+    private static final int USER_SETUP_IS_NOT_COMPLETE = 0;
+
+    private ImportantNoticeUtils() {
+        // This utility class is not publicly instantiable.
+    }
+
+    public static boolean isInSystemSetupWizard(final Context context) {
+        try {
+            final int userSetupComplete = Settings.Secure.getInt(
+                    context.getContentResolver(), Settings_Secure_USER_SETUP_COMPLETE);
+            return userSetupComplete == USER_SETUP_IS_NOT_COMPLETE;
+        } catch (final SettingNotFoundException e) {
+            Log.w(TAG, "Can't find settings in Settings.Secure: key="
+                    + Settings_Secure_USER_SETUP_COMPLETE);
+            return false;
+        }
+    }
+
+    private static SharedPreferences getImportantNoticePreferences(final Context context) {
+        return context.getSharedPreferences(PREFERENCE_NAME, Context.MODE_PRIVATE);
+    }
+
+    public static boolean hasNewImportantNotice(final Context context) {
+        final SharedPreferences prefs = getImportantNoticePreferences(context);
+        final int lastVersion = prefs.getInt(KEY_IMPORTANT_NOTICE_VERSION, 0);
+        return CURRENT_IMPORTANT_NOTICE_VERSION > lastVersion;
+    }
+
+    public static void updateLastImportantNoticeVersion(final Context context) {
+        final SharedPreferences prefs = getImportantNoticePreferences(context);
+        prefs.edit()
+                .putInt(KEY_IMPORTANT_NOTICE_VERSION, CURRENT_IMPORTANT_NOTICE_VERSION)
+                .apply();
+    }
+}