Combined Blog Feed

This commit addes a combined blog feed that shows all posts of all
subscribed blogs in the order the blog posts have been received.

For now, this commit also hides other blog functionality like adding
additional blogs and browsing individual blogs.

Closes #417

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

@@ -0,0 +1,202 @@
+package org.briarproject.android.blogs;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.annotation.Nullable;
+import android.support.design.widget.Snackbar;
+import android.support.v4.app.ActivityOptionsCompat;
+import android.support.v4.content.ContextCompat;
+import android.support.v7.widget.LinearLayoutManager;
+import android.view.LayoutInflater;
+import android.view.Menu;
+import android.view.MenuInflater;
+import android.view.MenuItem;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.view.ViewGroup;
+
+import org.briarproject.R;
+import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.blogs.BlogPostAdapter.OnBlogPostClickListener;
+import org.briarproject.android.controller.handler.UiResultHandler;
+import org.briarproject.android.fragment.BaseFragment;
+import org.briarproject.android.util.BriarRecyclerView;
+import org.briarproject.api.blogs.Blog;
+
+import java.util.Collection;
+
+import javax.inject.Inject;
+
+import static android.app.Activity.RESULT_OK;
+import static android.support.design.widget.Snackbar.LENGTH_LONG;
+import static android.support.v4.app.ActivityOptionsCompat.makeCustomAnimation;
+import static org.briarproject.android.BriarActivity.GROUP_ID;
+import static org.briarproject.android.blogs.BlogActivity.BLOG_NAME;
+import static org.briarproject.android.blogs.BlogActivity.REQUEST_WRITE_POST;
+
+public class FeedFragment extends BaseFragment implements
+		OnBlogPostClickListener, FeedController.OnBlogPostAddedListener {
+
+	public final static String TAG = FeedFragment.class.getName();
+
+	@Inject
+	FeedController feedController;
+
+	private BlogPostAdapter adapter;
+	private BriarRecyclerView list;
+	private Blog personalBlog = null;
+
+	static FeedFragment newInstance() {
+		FeedFragment f = new FeedFragment();
+
+		Bundle args = new Bundle();
+		f.setArguments(args);
+
+		return f;
+	}
+
+	@Nullable
+	@Override
+	public View onCreateView(LayoutInflater inflater, ViewGroup container,
+			Bundle savedInstanceState) {
+
+		setHasOptionsMenu(true);
+		View v = inflater.inflate(R.layout.fragment_blog, container, false);
+
+		adapter = new BlogPostAdapter(getActivity(), this);
+		list = (BriarRecyclerView) v.findViewById(R.id.postList);
+		list.setLayoutManager(new LinearLayoutManager(getActivity()));
+		list.setAdapter(adapter);
+		list.setEmptyText(R.string.blogs_feed_empty_state);
+
+		return v;
+	}
+
+	@Override
+	public void injectFragment(ActivityComponent component) {
+		component.inject(this);
+		feedController.setOnBlogPostAddedListener(this);
+	}
+
+	@Override
+	public void onActivityResult(int requestCode, int resultCode, Intent data) {
+		super.onActivityResult(requestCode, resultCode, data);
+
+		// The BlogPostAddedEvent arrives when the controller is not listening
+		if (requestCode == REQUEST_WRITE_POST && resultCode == RESULT_OK) {
+			// show snackbar informing about successful post creation
+			Snackbar s = Snackbar.make(list, R.string.blogs_blog_post_created,
+					LENGTH_LONG);
+			s.getView().setBackgroundResource(R.color.briar_primary);
+			OnClickListener onClick = new OnClickListener() {
+				@Override
+				public void onClick(View v) {
+					list.smoothScrollToPosition(0);
+				}
+			};
+			s.setActionTextColor(ContextCompat
+					.getColor(getContext(), R.color.briar_button_positive));
+			s.setAction(R.string.blogs_blog_post_scroll_to, onClick);
+			s.show();
+		}
+	}
+
+	@Override
+	public void onStart() {
+		super.onStart();
+		feedController
+				.loadPersonalBlog(new UiResultHandler<Blog>(getActivity()) {
+					@Override
+					public void onResultUi(Blog b) {
+						personalBlog = b;
+					}
+				});
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+		feedController.onResume();
+		feedController.loadPosts(
+				new UiResultHandler<Collection<BlogPostItem>>(getActivity()) {
+					@Override
+					public void onResultUi(Collection<BlogPostItem> posts) {
+						if (posts == null) {
+							// TODO show error?
+						} else if (posts.isEmpty()) {
+							list.showData();
+						} else {
+							adapter.addAll(posts);
+						}
+					}
+				});
+	}
+
+	@Override
+	public void onPause() {
+		super.onPause();
+		feedController.onPause();
+		// TODO save list position
+	}
+
+	@Override
+	public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
+		inflater.inflate(R.menu.blogs_feed_actions, menu);
+		super.onCreateOptionsMenu(menu, inflater);
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(final MenuItem item) {
+		switch (item.getItemId()) {
+			case R.id.action_write_blog_post:
+				if (personalBlog == null) return false;
+				Intent i =
+						new Intent(getActivity(), WriteBlogPostActivity.class);
+				i.putExtra(GROUP_ID, personalBlog.getId().getBytes());
+				i.putExtra(BLOG_NAME, personalBlog.getName());
+				ActivityOptionsCompat options =
+						makeCustomAnimation(getActivity(),
+								android.R.anim.slide_in_left,
+								android.R.anim.slide_out_right);
+				startActivityForResult(i, REQUEST_WRITE_POST,
+						options.toBundle());
+				return true;
+			default:
+				return super.onOptionsItemSelected(item);
+		}
+	}
+
+	@Override
+	public void onBlogPostAdded(final BlogPostItem post) {
+		getActivity().runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				adapter.add(post);
+				Snackbar s =
+						Snackbar.make(list, R.string.blogs_blog_post_received,
+								LENGTH_LONG);
+				s.getView().setBackgroundResource(R.color.briar_primary);
+				OnClickListener onClick = new OnClickListener() {
+					@Override
+					public void onClick(View v) {
+						list.smoothScrollToPosition(0);
+					}
+				};
+				s.setActionTextColor(ContextCompat
+						.getColor(getContext(), R.color.briar_button_positive));
+				s.setAction(R.string.blogs_blog_post_scroll_to, onClick);
+				s.show();
+			}
+		});
+	}
+
+	@Override
+	public void onBlogPostClick(int position) {
+		// noop
+	}
+
+	@Override
+	public String getUniqueTag() {
+		return TAG;
+	}
+}