Messaging: Further code improvements

* Remove redundant casts
* getParcelable(ArrayList|Exra) without class argument is deprecated
* ViewPager.setOnPageChangeListener -> addOnPageChangeListener
* RecyclerView.setOnScrollListener -> addOnScrollListener
* Remove unused initializations
* Remove unused code

Change-Id: I21beb6c90c675a4f2cfd7e3d5ebbd18b745f5911

src/com/android/messaging/ui/LicenseActivity.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2015 The Android Open Source Project
+ * Copyright (C) 2025 The LineageOS Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -29,7 +30,7 @@ public class LicenseActivity extends Activity {
     public void onCreate(final Bundle bundle) {
         super.onCreate(bundle);
         setContentView(R.layout.license_activity);
-        final WebView webView = (WebView) findViewById(R.id.content);
+        final WebView webView = findViewById(R.id.content);
         webView.loadUrl(LICENSE_URL);
     }
 }