Add a scene transition animation when reblogging a blog post

briar-android/res/layout/fragment_reblog.xml

@@ -11,6 +11,12 @@
 		android:layout_height="wrap_content"
 		android:padding="@dimen/margin_small">
 
+		<include
+			android:id="@+id/postLayout"
+			layout="@layout/list_item_blog_post"
+			android:layout_width="match_parent"
+			android:layout_height="wrap_content"/>
+
 		<ProgressBar
 			android:id="@+id/progressBar"
 			style="?android:attr/progressBarStyleLarge"
@@ -18,12 +24,6 @@
 			android:layout_height="wrap_content"
 			android:layout_centerInParent="true"/>
 
-		<include
-			android:id="@+id/postLayout"
-			layout="@layout/list_item_blog_post"
-			android:layout_width="match_parent"
-			android:layout_height="wrap_content"/>
-
 		<EditText
 			android:id="@+id/inputText"
 			android:layout_width="match_parent"

briar-android/src/org/briarproject/android/blogs/BlogPostViewHolder.java

@@ -1,9 +1,11 @@
 package org.briarproject.android.blogs;
 
+import android.app.Activity;
 import android.content.Context;
 import android.content.Intent;
+import android.support.v4.app.ActivityCompat;
 import android.support.v4.app.ActivityOptionsCompat;
-import android.support.v4.content.ContextCompat;
+import android.support.v4.view.ViewCompat;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -17,8 +19,9 @@ import org.briarproject.android.util.AuthorView;
 import org.briarproject.api.blogs.BlogCommentHeader;
 import org.briarproject.api.blogs.BlogPostHeader;
 import org.briarproject.api.identity.Author;
+import org.briarproject.api.sync.MessageId;
 
-import static android.support.v4.app.ActivityOptionsCompat.makeCustomAnimation;
+import static android.support.v4.app.ActivityOptionsCompat.makeSceneTransitionAnimation;
 import static android.view.View.GONE;
 import static android.view.View.VISIBLE;
 import static org.briarproject.android.BriarActivity.GROUP_ID;
@@ -62,7 +65,25 @@ public class BlogPostViewHolder extends RecyclerView.ViewHolder {
 		reblogButton.setVisibility(GONE);
 	}
 
+	void setTransitionName(MessageId id) {
+		ViewCompat.setTransitionName(layout, getTransitionName(id));
+	}
+
+	private String getTransitionName(MessageId id) {
+		return "blogPost" + id.hashCode();
+	}
+
 	void bindItem(final BlogPostItem item) {
+		setTransitionName(item.getId());
+		layout.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				if (listener != null) {
+					listener.onBlogPostClick(item);
+				}
+			}
+		});
+
 		// author and date
 		BlogPostHeader post = item.getPostHeader();
 		Author a = post.getAuthor();
@@ -86,11 +107,12 @@ public class BlogPostViewHolder extends RecyclerView.ViewHolder {
 				Intent i = new Intent(ctx, ReblogActivity.class);
 				i.putExtra(GROUP_ID, item.getGroupId().getBytes());
 				i.putExtra(POST_ID, item.getId().getBytes());
+
 				ActivityOptionsCompat options =
-						makeCustomAnimation(ctx, android.R.anim.slide_in_left,
-								android.R.anim.slide_out_right);
-				Intent[] intents = { i };
-				ContextCompat.startActivities(ctx, intents, options.toBundle());
+						makeSceneTransitionAnimation((Activity) ctx, layout,
+								getTransitionName(item.getId()));
+				ActivityCompat
+						.startActivity((Activity) ctx, i, options.toBundle());
 			}
 		});
 
@@ -101,15 +123,6 @@ public class BlogPostViewHolder extends RecyclerView.ViewHolder {
 		} else {
 			reblogger.setVisibility(GONE);
 		}
-
-		layout.setOnClickListener(new View.OnClickListener() {
-			@Override
-			public void onClick(View v) {
-				if (listener != null) {
-					listener.onBlogPostClick(item);
-				}
-			}
-		});
 	}
 
 	private void onBindComment(final BlogCommentItem item) {

briar-android/src/org/briarproject/android/blogs/ReblogActivity.java

@@ -1,7 +1,10 @@
 package org.briarproject.android.blogs;
 
+import android.annotation.TargetApi;
 import android.content.Intent;
 import android.os.Bundle;
+import android.transition.Fade;
+import android.transition.Transition;
 import android.view.MenuItem;
 
 import org.briarproject.R;
@@ -11,6 +14,8 @@ import org.briarproject.android.fragment.BaseFragment.BaseFragmentListener;
 import org.briarproject.api.sync.GroupId;
 import org.briarproject.api.sync.MessageId;
 
+import static android.os.Build.VERSION.SDK_INT;
+import static android.os.Build.VERSION_CODES.LOLLIPOP;
 import static org.briarproject.android.blogs.BlogActivity.POST_ID;
 
 public class ReblogActivity extends BriarActivity implements
@@ -20,6 +25,10 @@ public class ReblogActivity extends BriarActivity implements
 	public void onCreate(Bundle savedInstanceState) {
 		super.onCreate(savedInstanceState);
 
+		if (SDK_INT >= LOLLIPOP) {
+			setTransition();
+		}
+
 		Intent intent = getIntent();
 		byte[] groupId = intent.getByteArrayExtra(GROUP_ID);
 		if (groupId == null)
@@ -70,4 +79,14 @@ public class ReblogActivity extends BriarActivity implements
 	public void onFragmentCreated(String tag) {
 
 	}
+
+	@TargetApi(LOLLIPOP)
+	private void setTransition() {
+		Transition fade = new Fade();
+		fade.excludeTarget(android.R.id.statusBarBackground, true);
+		fade.excludeTarget(R.id.action_bar_container, true);
+		fade.excludeTarget(android.R.id.navigationBarBackground, true);
+		getWindow().setExitTransition(fade);
+		getWindow().setEnterTransition(fade);
+	}
 }

briar-android/src/org/briarproject/android/blogs/ReblogFragment.java

@@ -85,9 +85,10 @@ public class ReblogFragment extends BaseFragment {
 		blogId = new GroupId(args.getByteArray(GROUP_ID));
 		postId = new MessageId(args.getByteArray(POST_ID));
 
-		View v = inflater.inflate(R.layout.fragment_reblog_dialog, container,
+		View v = inflater.inflate(R.layout.fragment_reblog, container,
 				false);
 		ui = new ViewHolder(v);
+		ui.post.setTransitionName(postId);
 		showProgressBar();
 
 		return v;
@@ -137,7 +138,6 @@ public class ReblogFragment extends BaseFragment {
 		ui.scrollView.post(new Runnable() {
 			@Override
 			public void run() {
-				//ui.scrollView.scrollTo(0, ui.scrollView.getBottom());
 				ui.scrollView.fullScroll(FOCUS_DOWN);
 			}
 		});
@@ -166,14 +166,12 @@ public class ReblogFragment extends BaseFragment {
 
 	private void showProgressBar() {
 		ui.progressBar.setVisibility(VISIBLE);
-		ui.post.setVisibility(GONE);
 		ui.input.setVisibility(GONE);
 		ui.publish.setVisibility(GONE);
 	}
 
 	private void hideProgressBar() {
 		ui.progressBar.setVisibility(INVISIBLE);
-		ui.post.setVisibility(VISIBLE);
 		ui.input.setVisibility(VISIBLE);
 		ui.publish.setVisibility(VISIBLE);
 	}