Issue 6307 - Introduce external engine created callback

README.md

 Adblock Plus Library for Android
 ================================
 
 An Android library project, tests and demo application for AdblockWebView widget.
 
 ## Updating the dependencies
 
 Adblock Plus for Android has dependencies that aren't in this repository.
 To update those, call:
 
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 You can use `SharedPrefsStorage` implementation to store settings in `SharedPreferences`.
 Or you can use AdblockHelper:
 
     AdblockHelper
       .get()
       .init(this, getFilesDir().getAbsolutePath(), true, AdblockHelper.PREFERENCE_NAME);
 
       // optional - provide preloaded subscription files in app resoruces
       .preloadSubscriptions(AdblockHelper.PRELOAD_PREFERENCE_NAME, map);
 
+Sometimes it's desired to initialize or deinitialize FilterEngine instance
+when created:
+
+    AdblockHelper
+      .get()
+      .init(...)
+      .addEngineCreatedListener(engineCreatedListener)
+      
+or disposed:
+
+    AdblockHelper
+      .get()
+      .init(...)
+      .addEngineDisposedListener(engineDisposedListener)
+
 Implement the following interfaces in your settings activity:
 
 * `BaseSettingsFragment.Provider`
 * `GeneralSettingsFragment.Listener`
 * `WhitelistedDomainsSettingsFragment.Listener`
 
 and return created instance or AdblockHelper instances:
 
     AdblockHelper.get().getProvider().getEngine();  // engine
     AdblockHelper.get().getStorage(); // storage
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 This will generate *.apk in the 'libadblockplus-android-webviewapp/bin/' directory.
 
 #### Building with Gradle
 
 In the project root directory run:
 
     ./gradlew assemble
 
 This will generate *.apk in the 'libadblockplus-android-webviewapp/build/outputs/apk/' directory.