add transition animation for headlinesarticles activity

org.fox.ttrss/src/main/java/org/fox/ttrss/FeedsActivity.java

@@ -11,6 +11,8 @@ import android.os.Bundle;
 import android.os.Handler;
 import android.os.Parcelable;
 import android.preference.PreferenceManager;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.app.ActivityOptionsCompat;
 import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentTransaction;
 import android.support.v4.widget.DrawerLayout;
@@ -467,7 +469,18 @@ public class FeedsActivity extends OnlineActivity implements HeadlinesEventListe
             //intent.putParcelableArrayListExtra("articles", hf.getArticles());
             intent.putExtra("articles", (Parcelable)hf.getAllArticles());
 
-			startActivityForResult(intent, HEADLINES_REQUEST);
+            /* if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
+                startActivityForResult(intent, HEADLINES_REQUEST, ActivityOptions.makeSceneTransitionAnimation(this).toBundle());
+            } else {
+                startActivityForResult(intent, HEADLINES_REQUEST);
+            } */
+
+            View sharedList = hf.getView().findViewById(R.id.headlines_list);
+
+            ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, sharedList, "TRANSITION:HEADLINES_LIST");
+
+            ActivityCompat.startActivityForResult(this, intent, HEADLINES_REQUEST, options.toBundle());
+
 		} else {
 			invalidateOptionsMenu();
 		}

org.fox.ttrss/src/main/java/org/fox/ttrss/HeadlinesActivity.java

@@ -33,7 +33,7 @@ public class HeadlinesActivity extends OnlineActivity implements HeadlinesEventL
 
 		setAppTheme(m_prefs);
 
-		super.onCreate(savedInstanceState);
+        super.onCreate(savedInstanceState);
 
 		setContentView(R.layout.headlines_articles);
 
@@ -85,10 +85,14 @@ public class HeadlinesActivity extends OnlineActivity implements HeadlinesEventL
 
 				FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 
-				ft.replace(R.id.headlines_fragment, new LoadingFragment(), null);
+                final HeadlinesFragment hf = new HeadlinesFragment();
-				ft.replace(R.id.article_fragment, new LoadingFragment(), null);
+                hf.initialize(feed, article, true, m_articles);
+                hf.setSearchQuery(searchQuery);
 
-				ft.commit();
+                ft.replace(R.id.headlines_fragment, hf, FRAG_HEADLINES);
+                ft.replace(R.id.article_fragment, new LoadingFragment(), null);
+
+                ft.commit();
 				
 				setTitle(feed.title);
 
@@ -97,21 +101,15 @@ public class HeadlinesActivity extends OnlineActivity implements HeadlinesEventL
 					public void run() {
 						FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
 
-						HeadlinesFragment hf = new HeadlinesFragment();
-						hf.initialize(feed, article, true, m_articles);
-						hf.setSearchQuery(searchQuery);
-
 						ArticlePager af = new ArticlePager();
 						af.initialize(article != null ? hf.getArticleById(article.id) : new Article(), feed, m_articles);
 						af.setSearchQuery(searchQuery);
 
-						ft.replace(R.id.headlines_fragment, hf, FRAG_HEADLINES);
 						ft.replace(R.id.article_fragment, af, FRAG_ARTICLE);
 						
 						ft.commit();
-					}
+					 }
-				}, 25);
+				 }, 100);
-				
 			}
 		}
 	}

org.fox.ttrss/src/main/res/layout-sw600dp-land/headlines_articles.xml

@@ -22,6 +22,7 @@
         <FrameLayout
             android:paddingRight="4dp"
             android:id="@+id/headlines_fragment"
+            android:transitionName="TRANSITION:HEADLINES_LIST"
             android:layout_width="0dp"
             android:layout_height="match_parent"
             android:layout_weight="0.4"

org.fox.ttrss/src/main/res/layout/headlines_fragment.xml

@@ -12,6 +12,7 @@
 	   <ListView
 	       android:id="@+id/headlines_list"
 	       android:layout_width="match_parent"
+           android:transitionName="TRANSITION:HEADLINES_LIST"
 	       android:layout_height="match_parent" >
 	   </ListView>
 	</android.support.v4.widget.SwipeRefreshLayout>