Merge branch '517-simple-ui-for-managing-rss-feeds' into 'master'

Simple UI for Managing and Importing RSS Feeds

Please note that this does not yet include the reblogging style for displaying imported RSS entries.

![device-2016-07-26-170732](/uploads/e7f53f72e955d0c37518e0d552121105/device-2016-07-26-170732.png)
![device-2016-07-26-170755](/uploads/b8e0c91ed496b618d330364e840458dc/device-2016-07-26-170755.png)
![device-2016-07-26-171519](/uploads/fae5c16255d5a67673a4bd9be73c165f/device-2016-07-26-171519.png)

Closes #517

See merge request !251

briar-android/AndroidManifest.xml

@@ -182,6 +182,27 @@
 				/>
 		</activity>
 
+		<activity
+			android:name=".android.blogs.RssFeedImportActivity"
+			android:label="@string/blogs_rss_feeds_import"
+			android:parentActivityName=".android.NavDrawerActivity"
+			android:windowSoftInputMode="stateVisible|adjustResize">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value=".android.NavDrawerActivity"
+				/>
+		</activity>
+
+		<activity
+			android:name=".android.blogs.RssFeedManageActivity"
+			android:label="@string/blogs_rss_feeds_manage"
+			android:parentActivityName=".android.NavDrawerActivity">
+			<meta-data
+				android:name="android.support.PARENT_ACTIVITY"
+				android:value=".android.NavDrawerActivity"
+				/>
+		</activity>
+
 		<activity
 			android:name=".android.identity.CreateIdentityActivity"
 			android:label="@string/new_identity_title"

briar-android/res/drawable/action_delete_black.xml

@@ -0,0 +1,10 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:alpha="0.56"
+        android:viewportHeight="24.0"
+        android:viewportWidth="24.0">
+	<path
+		android:fillColor="#000000"
+		android:pathData="M6,19c0,1.1 0.9,2 2,2h8c1.1,0 2,-0.9 2,-2V7H6v12zM19,4h-3.5l-1,-1h-5l-1,1H5v2h14V4z"/>
+</vector>

briar-android/res/layout/activity_rss_feed_import.xml

@@ -0,0 +1,34 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical"
+	android:padding="@dimen/margin_small"
+	tools:context=".android.blogs.RssFeedImportActivity">
+
+	<EditText
+		android:id="@+id/urlInput"
+		android:layout_width="match_parent"
+		android:layout_height="0dp"
+		android:layout_weight="1"
+		android:gravity="top"
+		android:hint="@string/blogs_rss_feeds_import_hint"
+		android:inputType="textMultiLine|textUri"/>
+
+	<Button
+		android:id="@+id/importButton"
+		style="@style/BriarButton"
+		android:enabled="false"
+		android:text="@string/blogs_rss_feeds_import_button"/>
+
+	<ProgressBar
+		android:id="@+id/progressBar"
+		style="?android:attr/progressBarStyle"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_gravity="center"
+		android:visibility="gone"/>
+
+</LinearLayout>

briar-android/res/layout/activity_rss_feed_manage.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<org.briarproject.android.util.BriarRecyclerView
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	xmlns:app="http://schemas.android.com/apk/res-auto"
+	android:id="@+id/feedList"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	app:scrollToEnd="false"
+	app:emptyText="@string/blogs_rss_feeds_manage_empty_state"
+	tools:listitem="@layout/list_item_rss_feed"/>

briar-android/res/layout/list_item_rss_feed.xml

@@ -0,0 +1,123 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RelativeLayout
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:tools="http://schemas.android.com/tools"
+	android:layout_width="match_parent"
+	android:layout_height="wrap_content"
+	android:layout_marginLeft="@dimen/listitem_horizontal_margin"
+	android:layout_marginStart="@dimen/listitem_horizontal_margin"
+	android:layout_marginTop="@dimen/listitem_horizontal_margin"
+	android:background="?attr/selectableItemBackground">
+
+	<TextView
+		android:id="@+id/titleView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentTop="true"
+		android:maxLines="2"
+		android:textColor="@color/briar_text_primary"
+		android:textSize="@dimen/text_size_medium"
+		tools:text="This is a name of a RSS Feed"/>
+
+	<ImageView
+		android:id="@+id/deleteButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignParentRight="true"
+		android:layout_alignParentTop="true"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:contentDescription="@string/delete_button"
+		android:src="@drawable/action_delete_black"/>
+
+	<TextView
+		android:id="@+id/author"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_below="@+id/titleView"
+		android:layout_marginRight="@dimen/margin_small"
+		android:paddingTop="@dimen/margin_tiny"
+		android:text="@string/blogs_rss_feeds_manage_author"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"/>
+
+	<TextView
+		android:id="@+id/authorView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignBottom="@+id/author"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:layout_toRightOf="@+id/author"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		tools:text="Bruce Schneier"/>
+
+	<TextView
+		android:id="@+id/imported"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_below="@+id/author"
+		android:layout_marginRight="@dimen/margin_small"
+		android:paddingTop="@dimen/margin_tiny"
+		android:text="@string/blogs_rss_feeds_manage_imported"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"/>
+
+	<TextView
+		android:id="@+id/importedView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignBottom="@+id/imported"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:layout_toRightOf="@+id/imported"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		tools:text="July 4"/>
+
+	<TextView
+		android:id="@+id/updated"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_below="@+id/imported"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/margin_small"
+		android:paddingTop="@dimen/margin_tiny"
+		android:text="@string/blogs_rss_feeds_manage_updated"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"/>
+
+	<TextView
+		android:id="@+id/updatedView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_alignBottom="@+id/updated"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:layout_toRightOf="@+id/updated"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		tools:text="5 min. ago"/>
+
+	<TextView
+		android:id="@+id/descriptionView"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_below="@+id/updated"
+		android:layout_marginEnd="@dimen/listitem_horizontal_margin"
+		android:layout_marginRight="@dimen/listitem_horizontal_margin"
+		android:paddingTop="@dimen/margin_medium"
+		android:textColor="@color/briar_text_secondary"
+		android:textSize="@dimen/text_size_small"
+		tools:text="This is a description of the RSS feed. It can be several lines long, but it can also not exist at all if it is not present in the feed itself."/>
+
+	<View
+		style="@style/Divider.ForumList"
+		android:layout_alignParentLeft="true"
+		android:layout_alignParentStart="true"
+		android:layout_below="@+id/descriptionView"
+		android:layout_marginTop="@dimen/listitem_horizontal_margin"/>
+
+</RelativeLayout>
+

briar-android/res/menu/blogs_feed_actions.xml

@@ -9,4 +9,14 @@
 		android:title="@string/blogs_write_blog_post"
 		app:showAsAction="always"/>
 
+	<item
+		android:id="@+id/action_rss_feeds_import"
+		android:title="@string/blogs_rss_feeds_import"
+		app:showAsAction="never"/>
+
+	<item
+		android:id="@+id/action_rss_feeds_manage"
+		android:title="@string/blogs_rss_feeds_manage"
+		app:showAsAction="never"/>
+
 </menu>

briar-android/res/menu/rss_feed_manage_actions.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+	xmlns:android="http://schemas.android.com/apk/res/android"
+	xmlns:app="http://schemas.android.com/apk/res-auto">
+
+	<item
+		android:id="@+id/action_rss_feeds_import"
+		android:icon="@drawable/ic_add_white"
+		android:title="@string/blogs_rss_feeds_import"
+		app:showAsAction="always"/>
+
+</menu>

briar-android/res/values/attrs.xml

@@ -2,6 +2,7 @@
 <resources>
 	<declare-styleable name="BriarRecyclerView">
 		<attr name="scrollToEnd" format="boolean" />
+		<attr name="emptyText" format="string" />
 	</declare-styleable>
 
 </resources>

briar-android/res/values/strings.xml

@@ -309,4 +309,17 @@
 	<string name="blogs_available_blogs">Available Blogs</string>
 	<string name="blogs_drafts">Drafts</string>
 
+	<!-- RSS Feeds -->
+	<string name="blogs_rss_feeds_import">Import RSS Feed</string>
+	<string name="blogs_rss_feeds_import_button">Import</string>
+	<string name="blogs_rss_feeds_import_hint">Enter the URL of the RSS feed</string>
+	<string name="blogs_rss_feeds_import_error">We are sorry! There was an error importing your feed.</string>
+	<string name="blogs_rss_feeds_manage">Manage RSS Feeds</string>
+	<string name="blogs_rss_feeds_manage_imported">Imported:</string>
+	<string name="blogs_rss_feeds_manage_author">Author:</string>
+	<string name="blogs_rss_feeds_manage_updated">Last Updated:</string>
+	<string name="blogs_rss_feeds_manage_delete_error">The feed could not be deleted!</string>
+	<string name="blogs_rss_feeds_manage_empty_state">You haven\'t imported any RSS feeds.\n\nWhy don\'t you click the plus in the top right screen corner to add your first?</string>
+	<string name="blogs_rss_feeds_manage_error">There was a problem loading your feeds. Please try again later.</string>
+
 </resources>

briar-android/src/org/briarproject/android/ActivityComponent.java

@@ -10,6 +10,8 @@ import org.briarproject.android.blogs.BlogsFragment;
 import org.briarproject.android.blogs.CreateBlogActivity;
 import org.briarproject.android.blogs.FeedFragment;
 import org.briarproject.android.blogs.MyBlogsFragment;
+import org.briarproject.android.blogs.RssFeedImportActivity;
+import org.briarproject.android.blogs.RssFeedManageActivity;
 import org.briarproject.android.blogs.WriteBlogPostActivity;
 import org.briarproject.android.contact.ContactListFragment;
 import org.briarproject.android.contact.ConversationActivity;
@@ -87,6 +89,10 @@ public interface ActivityComponent {
 
 	void inject(IntroductionActivity activity);
 
+	void inject(RssFeedImportActivity activity);
+
+	void inject(RssFeedManageActivity activity);
+
 	// Fragments
 	void inject(ContactListFragment fragment);
 	void inject(ForumListFragment fragment);

briar-android/src/org/briarproject/android/AndroidComponent.java

@@ -16,6 +16,7 @@ import org.briarproject.api.crypto.PasswordStrengthEstimator;
 import org.briarproject.api.db.DatabaseConfig;
 import org.briarproject.api.db.DatabaseExecutor;
 import org.briarproject.api.event.EventBus;
+import org.briarproject.api.feed.FeedManager;
 import org.briarproject.api.forum.ForumManager;
 import org.briarproject.api.forum.ForumPostFactory;
 import org.briarproject.api.forum.ForumSharingManager;
@@ -112,6 +113,8 @@ public interface AndroidComponent extends CoreEagerSingletons {
 
 	AndroidExecutor androidExecutor();
 
+	FeedManager feedManager();
+
 	@IoExecutor
 	Executor ioExecutor();
 

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

@@ -140,20 +140,31 @@ public class FeedFragment extends BaseFragment implements
 
 	@Override
 	public boolean onOptionsItemSelected(final MenuItem item) {
+		if (personalBlog == null) return false;
+		ActivityOptionsCompat options =
+				makeCustomAnimation(getActivity(), android.R.anim.slide_in_left,
+						android.R.anim.slide_out_right);
 		switch (item.getItemId()) {
 			case R.id.action_write_blog_post:
-				if (personalBlog == null) return false;
+				Intent i1 =
-				Intent i =
 						new Intent(getActivity(), WriteBlogPostActivity.class);
-				i.putExtra(GROUP_ID, personalBlog.getId().getBytes());
+				i1.putExtra(GROUP_ID, personalBlog.getId().getBytes());
-				i.putExtra(BLOG_NAME, personalBlog.getName());
+				i1.putExtra(BLOG_NAME, personalBlog.getName());
-				ActivityOptionsCompat options =
+				startActivityForResult(i1, REQUEST_WRITE_POST,
-						makeCustomAnimation(getActivity(),
-								android.R.anim.slide_in_left,
-								android.R.anim.slide_out_right);
-				startActivityForResult(i, REQUEST_WRITE_POST,
 						options.toBundle());
 				return true;
+			case R.id.action_rss_feeds_import:
+				Intent i2 =
+						new Intent(getActivity(), RssFeedImportActivity.class);
+				i2.putExtra(GROUP_ID, personalBlog.getId().getBytes());
+				startActivity(i2, options.toBundle());
+				return true;
+			case R.id.action_rss_feeds_manage:
+				Intent i3 =
+						new Intent(getActivity(), RssFeedManageActivity.class);
+				i3.putExtra(GROUP_ID, personalBlog.getId().getBytes());
+				startActivity(i3, options.toBundle());
+				return true;
 			default:
 				return super.onOptionsItemSelected(item);
 		}

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

@@ -0,0 +1,192 @@
+package org.briarproject.android.blogs;
+
+import android.app.Activity;
+import android.support.annotation.Nullable;
+import android.support.v7.util.SortedList;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.briarproject.R;
+import org.briarproject.android.util.AndroidUtils;
+import org.briarproject.api.feed.Feed;
+import org.briarproject.api.sync.GroupId;
+
+import java.util.Collection;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+
+class RssFeedAdapter extends
+		RecyclerView.Adapter<RssFeedAdapter.FeedViewHolder> {
+
+	private SortedList<Feed> feeds = new SortedList<>(
+			Feed.class, new SortedList.Callback<Feed>() {
+
+		@Override
+		public int compare(Feed a, Feed b) {
+			if (a == b) return 0;
+			long aTime = a.getAdded(), bTime = b.getAdded();
+			if (aTime > bTime) return -1;
+			if (aTime < bTime) return 1;
+			return 0;
+		}
+
+		@Override
+		public void onInserted(int position, int count) {
+			notifyItemRangeInserted(position, count);
+		}
+
+		@Override
+		public void onRemoved(int position, int count) {
+			notifyItemRangeRemoved(position, count);
+		}
+
+		@Override
+		public void onMoved(int fromPosition, int toPosition) {
+			notifyItemMoved(fromPosition, toPosition);
+		}
+
+		@Override
+		public void onChanged(int position, int count) {
+			notifyItemRangeChanged(position, count);
+		}
+
+		@Override
+		public boolean areContentsTheSame(Feed a, Feed b) {
+			return a.getUpdated() == b.getUpdated();
+		}
+
+		@Override
+		public boolean areItemsTheSame(Feed a, Feed b) {
+			return a.getUrl().equals(b.getUrl()) &&
+					a.getBlogId().equals(b.getBlogId()) &&
+					a.getAdded() == b.getAdded();
+		}
+	});
+
+	private final Activity ctx;
+	private final RssFeedListener listener;
+
+	RssFeedAdapter(Activity ctx, RssFeedListener listener) {
+		this.ctx = ctx;
+		this.listener = listener;
+	}
+
+	@Override
+	public FeedViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+		View v = LayoutInflater.from(ctx).inflate(
+				R.layout.list_item_rss_feed, parent, false);
+		return new FeedViewHolder(v);
+	}
+
+	@Override
+	public void onBindViewHolder(FeedViewHolder ui, int position) {
+		final Feed item = getItem(position);
+
+		// Feed Title
+		if (item.getTitle() != null) {
+			ui.title.setText(item.getTitle());
+			ui.title.setVisibility(VISIBLE);
+		} else {
+			ui.title.setVisibility(GONE);
+		}
+
+		// Delete Button
+		ui.delete.setOnClickListener(new OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				listener.onDeleteClick(item);
+			}
+		});
+
+		// Author
+		if (item.getAuthor() != null) {
+			ui.author.setText(item.getAuthor());
+			ui.author.setVisibility(VISIBLE);
+			ui.authorLabel.setVisibility(VISIBLE);
+		} else {
+			ui.author.setVisibility(GONE);
+			ui.authorLabel.setVisibility(GONE);
+		}
+
+		// Imported and Last Updated
+		ui.imported.setText(AndroidUtils.formatDate(ctx, item.getAdded()));
+		ui.updated.setText(AndroidUtils.formatDate(ctx, item.getUpdated()));
+
+		// Description
+		if (item.getDescription() != null) {
+			ui.description.setText(item.getDescription());
+			ui.description.setVisibility(VISIBLE);
+		} else {
+			ui.description.setVisibility(GONE);
+		}
+	}
+
+	@Override
+	public int getItemCount() {
+		return feeds.size();
+	}
+
+	public Feed getItem(int position) {
+		return feeds.get(position);
+	}
+
+	@Nullable
+	public Feed getItem(GroupId g) {
+		for (int i = 0; i < feeds.size(); i++) {
+			Feed item = feeds.get(i);
+			if (item.getBlogId().equals(g)) {
+				return item;
+			}
+		}
+		return null;
+	}
+
+	public void addAll(Collection<Feed> items) {
+		feeds.addAll(items);
+	}
+
+	public void remove(Feed item) {
+		feeds.remove(item);
+	}
+
+	public void clear() {
+		feeds.clear();
+	}
+
+	public boolean isEmpty() {
+		return feeds.size() == 0;
+	}
+
+	static class FeedViewHolder extends RecyclerView.ViewHolder {
+		private final TextView title;
+		private final ImageView delete;
+		private final TextView imported;
+		private final TextView updated;
+		private final TextView author;
+		private final TextView authorLabel;
+		private final TextView description;
+
+		FeedViewHolder(View v) {
+			super(v);
+
+			title = (TextView) v.findViewById(R.id.titleView);
+			delete = (ImageView) v.findViewById(R.id.deleteButton);
+			imported = (TextView) v.findViewById(R.id.importedView);
+			updated = (TextView) v.findViewById(R.id.updatedView);
+			author = (TextView) v.findViewById(R.id.authorView);
+			authorLabel = (TextView) v.findViewById(R.id.author);
+			description = (TextView) v.findViewById(R.id.descriptionView);
+		}
+	}
+
+	interface RssFeedListener {
+		void onDeleteClick(Feed feed);
+	}
+
+}

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

@@ -0,0 +1,178 @@
+package org.briarproject.android.blogs;
+
+import android.content.DialogInterface;
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v7.app.AlertDialog;
+import android.text.Editable;
+import android.text.TextWatcher;
+import android.view.Menu;
+import android.view.MenuItem;
+import android.view.View;
+import android.widget.Button;
+import android.widget.EditText;
+import android.widget.ProgressBar;
+
+import org.briarproject.R;
+import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.BriarActivity;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.feed.FeedManager;
+import org.briarproject.api.lifecycle.IoExecutor;
+import org.briarproject.api.sync.GroupId;
+
+import java.io.IOException;
+import java.util.concurrent.Executor;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static android.view.View.GONE;
+import static android.view.View.VISIBLE;
+import static java.util.logging.Level.WARNING;
+
+public class RssFeedImportActivity extends BriarActivity {
+
+	private static final Logger LOG =
+			Logger.getLogger(RssFeedImportActivity.class.getName());
+
+	private EditText urlInput;
+	private Button importButton;
+	private ProgressBar progressBar;
+
+	@Inject
+	@IoExecutor
+	protected Executor ioExecutor;
+
+	// Fields that are accessed from background threads must be volatile
+	private volatile GroupId groupId = null;
+	@Inject
+	@SuppressWarnings("WeakerAccess")
+	volatile FeedManager feedManager;
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		// GroupId from Intent
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra(GROUP_ID);
+		if (b == null) throw new IllegalStateException("No Group in intent.");
+		groupId = new GroupId(b);
+
+		setContentView(R.layout.activity_rss_feed_import);
+
+		urlInput = (EditText) findViewById(R.id.urlInput);
+		urlInput.addTextChangedListener(new TextWatcher() {
+			@Override
+			public void beforeTextChanged(CharSequence s, int start, int count,
+					int after) {
+			}
+
+			@Override
+			public void onTextChanged(CharSequence s, int start, int before,
+					int count) {
+			}
+
+			@Override
+			public void afterTextChanged(Editable s) {
+				enableOrDisableImportButton();
+			}
+		});
+
+		importButton = (Button) findViewById(R.id.importButton);
+		importButton.setOnClickListener(new View.OnClickListener() {
+			@Override
+			public void onClick(View v) {
+				publish();
+			}
+		});
+
+		progressBar = (ProgressBar) findViewById(R.id.progressBar);
+	}
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		return super.onCreateOptionsMenu(menu);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		return super.onOptionsItemSelected(item);
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	private void enableOrDisableImportButton() {
+		String url = urlInput.getText().toString();
+		if (url.startsWith("http://") || url.startsWith("https://"))
+			importButton.setEnabled(true);
+		else
+			importButton.setEnabled(false);
+	}
+
+	private void publish() {
+		// hide import button, show progress bar
+		importButton.setVisibility(GONE);
+		progressBar.setVisibility(VISIBLE);
+
+		importFeed(urlInput.getText().toString());
+	}
+
+	private void importFeed(final String url) {
+		ioExecutor.execute(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					feedManager.addFeed(url, groupId);
+					feedImported();
+				} catch (DbException | IOException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+					importFailed();
+				}
+			}
+		});
+	}
+
+	private void feedImported() {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				supportFinishAfterTransition();
+			}
+		});
+	}
+
+	private void importFailed() {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				// hide progress bar, show publish button
+				progressBar.setVisibility(GONE);
+				importButton.setVisibility(VISIBLE);
+
+				// show error dialog
+				AlertDialog.Builder builder =
+						new AlertDialog.Builder(RssFeedImportActivity.this,
+								R.style.BriarDialogTheme);
+				builder.setMessage(R.string.blogs_rss_feeds_import_error);
+				builder.setNegativeButton(R.string.cancel_button, null);
+				builder.setPositiveButton(R.string.try_again_button,
+						new DialogInterface.OnClickListener() {
+							@Override
+							public void onClick(DialogInterface dialog, int which) {
+								publish();
+							}
+						});
+				AlertDialog dialog = builder.create();
+				dialog.show();
+			}
+		});
+	}
+
+}
+

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

@@ -0,0 +1,167 @@
+package org.briarproject.android.blogs;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.design.widget.Snackbar;
+import android.support.v4.app.ActivityCompat;
+import android.support.v4.app.ActivityOptionsCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+
+import org.briarproject.R;
+import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.BriarActivity;
+import org.briarproject.android.blogs.RssFeedAdapter.RssFeedListener;
+import org.briarproject.android.util.BriarRecyclerView;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.feed.Feed;
+import org.briarproject.api.feed.FeedManager;
+import org.briarproject.api.sync.GroupId;
+
+import java.util.List;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static android.support.design.widget.Snackbar.LENGTH_LONG;
+import static android.support.v4.app.ActivityOptionsCompat.makeCustomAnimation;
+import static java.util.logging.Level.WARNING;
+
+public class RssFeedManageActivity extends BriarActivity
+		implements RssFeedListener {
+
+	private static final Logger LOG =
+			Logger.getLogger(RssFeedManageActivity.class.getName());
+
+	private BriarRecyclerView list;
+	private RssFeedAdapter adapter;
+
+	// Fields that are accessed from background threads must be volatile
+	private volatile GroupId groupId = null;
+	@Inject
+	@SuppressWarnings("WeakerAccess")
+	volatile FeedManager feedManager;
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		// GroupId from Intent
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra(GROUP_ID);
+		if (b == null) throw new IllegalStateException("No Group in intent.");
+		groupId = new GroupId(b);
+
+		setContentView(R.layout.activity_rss_feed_manage);
+
+		adapter = new RssFeedAdapter(this, this);
+
+		list = (BriarRecyclerView) findViewById(R.id.feedList);
+		list.setLayoutManager(new LinearLayoutManager(this));
+		list.setAdapter(adapter);
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		loadFeeds();
+	}
+
+	@Override
+	public boolean onCreateOptionsMenu(Menu menu) {
+		MenuInflater inflater = getMenuInflater();
+		inflater.inflate(R.menu.rss_feed_manage_actions, menu);
+		return super.onCreateOptionsMenu(menu);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(MenuItem item) {
+		switch (item.getItemId()) {
+			case android.R.id.home:
+				onBackPressed();
+				return true;
+			case R.id.action_rss_feeds_import:
+				Intent i =
+						new Intent(this, RssFeedImportActivity.class);
+				i.putExtra(GROUP_ID, groupId.getBytes());
+				ActivityOptionsCompat options =
+						makeCustomAnimation(this, android.R.anim.slide_in_left,
+								android.R.anim.slide_out_right);
+				ActivityCompat.startActivity(this, i, options.toBundle());
+				return true;
+			default:
+				return super.onOptionsItemSelected(item);
+		}
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	@Override
+	public void onDeleteClick(final Feed feed) {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					feedManager.removeFeed(feed.getUrl());
+					onFeedDeleted(feed);
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+					onDeleteError();
+				}
+			}
+		});
+	}
+
+	private void loadFeeds() {
+		runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				try {
+					addFeeds(feedManager.getFeeds());
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+					list.setEmptyText(R.string.blogs_rss_feeds_manage_error);
+					list.showData();
+				}
+			}
+		});
+	}
+
+	private void addFeeds(final List<Feed> feeds) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				if (feeds.size() == 0) list.showData();
+				else adapter.addAll(feeds);
+			}
+		});
+	}
+
+	private void onFeedDeleted(final Feed feed) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				adapter.remove(feed);
+			}
+		});
+	}
+
+	private void onDeleteError() {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				Snackbar.make(list,
+						R.string.blogs_rss_feeds_manage_delete_error,
+						LENGTH_LONG).show();
+			}
+		});
+	}
+}
+

briar-android/src/org/briarproject/android/util/BriarRecyclerView.java

@@ -47,6 +47,9 @@ public class BriarRecyclerView extends FrameLayout {
 				R.styleable.BriarRecyclerView);
 		isScrollingToEnd = attributes
 				.getBoolean(R.styleable.BriarRecyclerView_scrollToEnd, true);
+		String emtpyText =
+				attributes.getString(R.styleable.BriarRecyclerView_emptyText);
+		if (emtpyText != null) setEmptyText(emtpyText);
 		attributes.recycle();
 	}
 
@@ -94,6 +97,11 @@ public class BriarRecyclerView extends FrameLayout {
 				super.onItemRangeInserted(positionStart, itemCount);
 				if (itemCount > 0) showData();
 			}
+			@Override
+			public void onItemRangeRemoved(int positionStart, int itemCount) {
+				super.onItemRangeRemoved(positionStart, itemCount);
+				if (itemCount > 0) showData();
+			}
 		};
 	}