[Offline Page] Offline page sharing implementation

chrome/android/java/src/org/chromium/chrome/browser/ChromeApplication.java

 // Copyright 2013 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;
 
 import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
 import android.content.SharedPreferences;
@@ skipping 44 matching lines @@
 import org.chromium.chrome.browser.identity.UniqueIdentificationGeneratorFactory;
 import org.chromium.chrome.browser.identity.UuidBasedUniqueIdentificationGenerator;
 import org.chromium.chrome.browser.init.InvalidStartupDialog;
 import org.chromium.chrome.browser.invalidation.UniqueIdInvalidationClientNameGenerator;
 import org.chromium.chrome.browser.metrics.UmaUtils;
 import org.chromium.chrome.browser.metrics.VariationsSession;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
 import org.chromium.chrome.browser.net.qualityprovider.ExternalEstimateProviderAndroid;
 import org.chromium.chrome.browser.net.spdyproxy.DataReductionProxySettings;
 import org.chromium.chrome.browser.notifications.NotificationPlatformBridge;
+import org.chromium.chrome.browser.offlinepages.OfflinePageUtils;
 import org.chromium.chrome.browser.omaha.RequestGenerator;
 import org.chromium.chrome.browser.partnercustomizations.PartnerBrowserCustomizations;
 import org.chromium.chrome.browser.physicalweb.PhysicalWebBleClient;
 import org.chromium.chrome.browser.physicalweb.PhysicalWebEnvironment;
 import org.chromium.chrome.browser.policy.PolicyAuditor;
 import org.chromium.chrome.browser.preferences.LocationSettings;
 import org.chromium.chrome.browser.preferences.PrefServiceBridge;
 import org.chromium.chrome.browser.preferences.Preferences;
 import org.chromium.chrome.browser.preferences.PreferencesLauncher;
 import org.chromium.chrome.browser.preferences.autofill.AutofillPreferences;
@@ skipping 259 matching lines @@
     /**
      * Called after onForegroundSessionEnd() indicating that the activity whose onStop() ended the
      * last foreground session was destroyed.
      */
     private void onForegroundActivityDestroyed() {
         if (ApplicationStatus.isEveryActivityDestroyed()) {
             // These will all be re-initialized when a new Activity starts / upon next use.
             mBackgroundProcessing.onDestroy();
             PartnerBrowserCustomizations.destroy();
             ShareHelper.clearSharedImages(this);
+            OfflinePageUtils.clearSharedOfflineFiles(this);

[gone, 2016/08/12 01:26:12]

This is run every single time an Activity dies (which can be often).  Is that
absolutely necessary?  You already do it once in onDeferredStartup, when Clank
starts up cold, which seems Good Enough™ and better for performance.

[Vivian, 2016/08/12 23:07:12]

I'm not an expert of this...just followed wherever "clearShareImages" is called.
I defer to your judgement. Deleted the line.

         }
     }
 
     private ApplicationStateListener createApplicationStateListener() {
         return new ApplicationStateListener() {
             @Override
             public void onApplicationStateChange(int newState) {
                 if (newState == ApplicationState.HAS_STOPPED_ACTIVITIES) {
                     onForegroundSessionEnd();
                 } else if (newState == ApplicationState.HAS_DESTROYED_ACTIVITIES) {
@@ skipping 522 matching lines @@
      * Caches flags that are needed by Activities that launch before the native library is loaded
      * and stores them in SharedPreferences. Because this function is called during launch after the
      * library has loaded, they won't affect the next launch until Chrome is restarted.
      */
     private void cacheNativeFlags() {
         if (sIsFinishedCachingNativeFlags) return;
         FeatureUtilities.cacheNativeFlags(this);
         sIsFinishedCachingNativeFlags = true;
     }
 }