Add UMA for the content suggestions settings

chrome/android/java/src/org/chromium/chrome/browser/preferences/ContentSuggestionsPreferences.java

 // Copyright 2017 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;
 
 import android.os.Bundle;
 import android.preference.Preference;
 import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.PreferenceFragment;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 
+import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.help.HelpAndFeedback;
 import org.chromium.chrome.browser.ntp.snippets.SnippetsBridge;
 import org.chromium.chrome.browser.profiles.Profile;
+import org.chromium.chrome.browser.suggestions.ContentSuggestionsUma;
 
 /**
  * Settings fragment that allows the user to configure content suggestions.
  */
 public class ContentSuggestionsPreferences extends PreferenceFragment {
     private static final String PREF_MAIN_SWITCH = "suggestions_switch";
     private static final String PREF_NOTIFICATIONS_SWITCH = "suggestions_notifications_switch";
     private static final String PREF_CAVEATS = "suggestions_caveats";
     private static final String PREF_LEARN_MORE = "suggestions_learn_more";
 
+    private boolean mWasEnabledAtCreation;
     private boolean mIsEnabled;
 
     // Preferences, modified as the state of the screen changes.
     private ChromeSwitchPreference mFeatureSwitch;
     private ChromeSwitchPreference mNotificationsSwitch;
     private Preference mCaveatsDescription;
     private Preference mLearnMoreButton;
 
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         addPreferencesFromResource(R.xml.suggestions_preferences);
         setHasOptionsMenu(true);
         finishSwitchInitialisation();
 
-        boolean isEnabled = SnippetsBridge.isRemoteSuggestionsServiceEnabled();
-        mIsEnabled = !isEnabled; // Opposite so that we trigger side effects below.
-        updatePreferences(isEnabled);
+        mWasEnabledAtCreation = SnippetsBridge.isRemoteSuggestionsServiceEnabled();
+        mIsEnabled = !mWasEnabledAtCreation; // Opposite so that we trigger side effects below.
+        updatePreferences(mWasEnabledAtCreation);
     }
 
     @Override
     public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
         menu.clear();
         MenuItem help =
                 menu.add(Menu.NONE, R.id.menu_id_targeted_help, Menu.NONE, R.string.menu_help);
         help.setIcon(R.drawable.ic_help_and_feedback);
     }
 
     @Override
     public boolean onOptionsItemSelected(MenuItem item) {
         if (item.getItemId() == R.id.menu_id_targeted_help) {
             // TODO(dgn): The help page needs to be added and the context reserved.
             HelpAndFeedback.getInstance(getActivity())
                     .show(getActivity(), getString(R.string.help_context_suggestions),
                             Profile.getLastUsedProfile(), null);
             return true;
         }
         return false;
     }
 
+    @Override
+    public void onDestroy() {
+        super.onDestroy();
+
+        int statusChange;
+        if (mWasEnabledAtCreation) {
+            statusChange = mIsEnabled ? ContentSuggestionsUma.PREFERENCE_TOGGLE_ON_TO_ON
+                                      : ContentSuggestionsUma.PREFERENCE_TOGGLE_ON_TO_OFF;
+        } else {
+            statusChange = mIsEnabled ? ContentSuggestionsUma.PREFERENCE_TOGGLE_OFF_TO_ON
+                                      : ContentSuggestionsUma.PREFERENCE_TOGGLE_OFF_TO_OFF;
+        }
+        ContentSuggestionsUma.remoteSuggestionsPreferencesUIAction(statusChange);
+    }
+
     /**
      * Switches preference screens depending on whether the remote suggestions are enabled/disabled.
      * @param isEnabled Indicates whether the remote suggestions are enabled.
      */
     public void updatePreferences(boolean isEnabled) {
         if (mIsEnabled == isEnabled) return;
 
         mFeatureSwitch.setChecked(isEnabled);
 
         if (isEnabled) {
             setNotificationsPrefState(true);
             setCaveatsPrefState(false);
         } else {
             setNotificationsPrefState(false);
             setCaveatsPrefState(true);
         }
         mIsEnabled = isEnabled;
     }
 
     private void setNotificationsPrefState(boolean visible) {
         if (visible) {
+            RecordUserAction.record("ContentSuggestions.RemoteSuggestionsPreferenceOn");
             if (findPreference(PREF_NOTIFICATIONS_SWITCH) != null) return;
             getPreferenceScreen().addPreference(mNotificationsSwitch);
             mNotificationsSwitch.setChecked(true); // TODO(dgn): initialise properly.
         } else {
+            RecordUserAction.record("ContentSuggestions.RemoteSuggestionsPreferenceOff");
             getPreferenceScreen().removePreference(mNotificationsSwitch);
         }
     }
 
     private void setCaveatsPrefState(boolean visible) {
         if (visible) {
             if (findPreference(PREF_CAVEATS) != null) return;
             getPreferenceScreen().addPreference(mCaveatsDescription);
             getPreferenceScreen().addPreference(mLearnMoreButton);
         } else {
@@ skipping 32 matching lines @@
 
         mNotificationsSwitch.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
             @Override
             public boolean onPreferenceChange(Preference preference, Object newValue) {
                 // TODO(dgn) implement preference change.
                 return true;
             }
         });
     }
 }