Simple UI for Managing and Importing RSS Feeds

Closes #517

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();
+			}
+		});
+	}
+}
+