refactored StreamingService interface so it acts as a Factory (returning new instances of called classes, eg Extractor), rather than passing Class objects (which loses type safety) which are then instantiated. Also noticed there is a conflict between existing gradle setup and mine: misc.xml and app.iml have had their jvm version values switched from 1.8 to 1.7

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

@@ -29,6 +29,7 @@ import android.widget.Toast;
  * along with NewPipe.  If not, see <http://www.gnu.org/licenses/>.
  */
 
+/***/
 public class VideoItemDetailActivity extends AppCompatActivity {
 
     private static final String TAG = VideoItemDetailActivity.class.toString();
@@ -69,7 +70,7 @@ public class VideoItemDetailActivity extends AppCompatActivity {
                         try {
                             currentStreamingService = i;
                             extractor = (Extractor) ServiceList.getService(i)
-                                    .getExtractorClass().newInstance();
+                                    .getExtractorInstance();
                         } catch (Exception e) {
                             e.printStackTrace();
                         }
@@ -123,9 +124,9 @@ public class VideoItemDetailActivity extends AppCompatActivity {
             // activity, the Up button is shown. Use NavUtils to allow users
             // to navigate up one level in the application structure. For
             // more details, see the Navigation pattern on Android Design:
-            //
+
             // http://developer.android.com/design/patterns/navigation.html#up-vs-back
-            //
+
             Intent intent = new Intent(this, VideoItemListActivity.class);
             intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
             NavUtils.navigateUpTo(this, intent);