Refactoring:

* renamed VideoInfoItem to VideoPreviewInfo
* moved streaming service-related classes into their own, new package services
* added javadoc to some classes and methods (where functionality is known well enough to explain)
* De-duplicated common fields between VideoInfo and VideoPreviewInfo by moving them into a common superclass: AbstractVideoInfo
* Removed 2 methods which only call super(), and therefore are unnecessary: PlayVideoActivity.onResume() and PlayVideoActivity.onPostCreate(Bundle)

app/src/main/java/org/schabi/newpipe/PlayVideoActivity.java

@@ -89,6 +89,8 @@ public class PlayVideoActivity extends AppCompatActivity {
             mediaController = new MediaController(this);
         }
 
+        position = intent.getIntExtra(START_POSITION, 0)*1000;//convert from seconds to milliseconds
+
         videoView = (VideoView) findViewById(R.id.video_view);
         progressBar = (ProgressBar) findViewById(R.id.play_video_progress_bar);
         try {
@@ -146,11 +148,6 @@ public class PlayVideoActivity extends AppCompatActivity {
         }
     }
 
-    @Override
-    protected void onPostCreate(Bundle savedInstanceState) {
-        super.onPostCreate(savedInstanceState);
-    }
-
     @Override
     public boolean onCreatePanelMenu(int featured, Menu menu) {
         super.onCreatePanelMenu(featured, menu);
@@ -160,11 +157,6 @@ public class PlayVideoActivity extends AppCompatActivity {
         return true;
     }
 
-    @Override
-    public void onResume() {
-        super.onResume();
-    }
-
     @Override
     public void onPause() {
         super.onPause();