Snackbar for promoting Data Saver to existing users

chrome/android/java/src/org/chromium/chrome/browser/preferences/datareduction/DataReductionPromoUtils.java

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package org.chromium.chrome.browser.preferences.datareduction;
 
 import org.chromium.base.ContextUtils;
 import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge.AboutVersionStrings;
 
 /**
  * Helper functions for displaying the various data reduction proxy promos. The promo screens
  * inform users of the benefits of Data Saver.
  */
 public class DataReductionPromoUtils {
     /**
-     * Keys used to save whether the first run experience or second run promo screen has been shown,
-     * the time in milliseconds since epoch it was shown, the Chrome version it was shown in, and
-     * whether the user opted out of the data reduction proxy in the FRE promo.
+     * Key used to save whether the first run experience or second run promo screen has been shown.
      */
     private static final String SHARED_PREF_DISPLAYED_FRE_OR_SECOND_RUN_PROMO =
             "displayed_data_reduction_promo";
+    /**
+     * Key used to save the time in milliseconds since epoch that the first run experience or second
+     * run promo was shown.
+     */
     private static final String SHARED_PREF_DISPLAYED_FRE_OR_SECOND_PROMO_TIME_MS =
             "displayed_data_reduction_promo_time_ms";
+    /**
+     * Key used to save the Chrome version the first run experience or second run promo was shown
+     * in.
+     */
     private static final String SHARED_PREF_DISPLAYED_FRE_OR_SECOND_PROMO_VERSION =
             "displayed_data_reduction_promo_version";
+    /**
+     * Key used to save whether the user opted out of the data reduction proxy in the FRE promo.
+     */
     private static final String SHARED_PREF_FRE_PROMO_OPT_OUT = "fre_promo_opt_out";
-
     /**
-     * Keys used to save whether the infobar promo is shown and the Chrome version it was shown in.
+     * Key used to save whether the infobar promo has been shown.
      */
     private static final String SHARED_PREF_DISPLAYED_INFOBAR_PROMO =
             "displayed_data_reduction_infobar_promo";
+    /**
+     * Key used to save the Chrome version the infobar promo was shown in.
+     */
     private static final String SHARED_PREF_DISPLAYED_INFOBAR_PROMO_VERSION =
             "displayed_data_reduction_infobar_promo_version";
+    /**
+     * Key used to save the saved bytes when the snackbar promo was last shown.
+     */
+    private static final String SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES =
+            "displayed_data_reduction_snackbar_promo_saved_bytes";
 
     /**
      * Returns whether any of the data reduction proxy promotions can be displayed. Checks if the
      * proxy is allowed by the DataReductionProxyConfig, already on, or if the user is managed. If
      * the data reduction proxy is managed by an administrator's policy, the user should not be
      * given a promotion to enable it.
      *
      * @return Whether the any data reduction proxy promotion has been displayed.
      */
     public static boolean canShowPromos() {
@@ skipping 85 matching lines @@
 
     /**
      * Returns whether the data reduction proxy infobar promo has been displayed before.
      *
      * @return Whether the data reduction proxy infobar promo has been displayed.
      */
     public static boolean getDisplayedInfoBarPromo() {
         return ContextUtils.getAppSharedPreferences().getBoolean(
                 SHARED_PREF_DISPLAYED_INFOBAR_PROMO, false);
     }
+
+    /** See {@link #SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES}. */
+    public static void saveSnackbarPromoDisplayed(long dataSavingInBytes) {
+        ContextUtils.getAppSharedPreferences()
+                .edit()
+                .putLong(SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES, dataSavingInBytes)
+                .apply();
+    }
+
+    /**
+     * Returns the data saving in bytes from when the promo snackbar was last displayed.
+     *
+     * @return The content length, or -1 if the promo has not been displayed before.

[tbansal1, 2016/10/26 00:09:30]

nit: "The content length"
update the comment.

[megjablon, 2016/10/26 18:22:57]

Done.

+     */
+    public static long getDisplayedSnackbarPromoSavedBytes() {
+        return ContextUtils.getAppSharedPreferences().getLong(
+                SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES, -1);
+    }
+
+    /**
+     * Saves a shared pref indicating the data saving in bytes on the first upgrade to the version
+     * that shows the snackbar.
+     */
+    public static void saveSnackbarPromoInitWithStartingSavedBytes(long dataSavingInBytes) {
+        ContextUtils.getAppSharedPreferences()
+                .edit()
+                .putLong(SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES, dataSavingInBytes)
+                .apply();
+    }
+
+    /**
+     * Returns a boolean indicating that the data savings in bytes on the first upgrade to the
+     * version that shows the snackbar has been initialized.
+     *
+     * @return Whether that the starting saved bytes have been initialized.
+     */
+    public static boolean hasSnackbarPromoBeenInitWithStartingSavedBytes() {
+        return ContextUtils.getAppSharedPreferences()
+                .contains(SHARED_PREF_DISPLAYED_SNACKBAR_PROMO_SAVED_BYTES);
+    }
 }