Add a new activity that shows sharing status of forum

The new activity shows who you are sharing a forum with and who shares a
forum with you. It is accessible from the overflow menu when in a forum.

Closes #398

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

@@ -7,6 +7,7 @@ import org.briarproject.android.forum.AvailableForumsActivity;
 import org.briarproject.android.forum.ContactSelectorFragment;
 import org.briarproject.android.forum.CreateForumActivity;
 import org.briarproject.android.forum.ForumActivity;
+import org.briarproject.android.forum.ForumSharingStatusActivity;
 import org.briarproject.android.forum.ReadForumPostActivity;
 import org.briarproject.android.forum.ShareForumActivity;
 import org.briarproject.android.forum.ShareForumMessageFragment;
@@ -59,6 +60,8 @@ public interface ActivityComponent {
 
 	void inject(ShareForumActivity activity);
 
+	void inject(ForumSharingStatusActivity activity);
+
 	void inject(ReadForumPostActivity activity);
 
 	void inject(ForumActivity activity);

briar-android/src/org/briarproject/android/contact/ContactListItem.java

@@ -30,7 +30,7 @@ public class ContactListItem {
 	}
 
 	void setMessages(Collection<ConversationItem> messages) {
-		empty = messages.isEmpty();
+		empty = messages == null || messages.isEmpty();
 		timestamp = 0;
 		unread = 0;
 		if (!empty) {

briar-android/src/org/briarproject/android/forum/ForumActivity.java

@@ -153,6 +153,9 @@ public class ForumActivity extends BriarActivity implements EventListener,
 
 	@Override
 	public boolean onOptionsItemSelected(final MenuItem item) {
+		ActivityOptionsCompat options = ActivityOptionsCompat
+				.makeCustomAnimation(this, android.R.anim.slide_in_left,
+						android.R.anim.slide_out_right);
 		// Handle presses on the action bar items
 		switch (item.getItemId()) {
 			case R.id.action_forum_compose_post:
@@ -166,13 +169,16 @@ public class ForumActivity extends BriarActivity implements EventListener,
 				Intent i2 = new Intent(this, ShareForumActivity.class);
 				i2.setFlags(FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_SINGLE_TOP);
 				i2.putExtra(GROUP_ID, groupId.getBytes());
-				ActivityOptionsCompat options = ActivityOptionsCompat
-						.makeCustomAnimation(this, android.R.anim.slide_in_left,
-								android.R.anim.slide_out_right);
 				ActivityCompat
 						.startActivityForResult(this, i2, REQUEST_FORUM_SHARED,
 								options.toBundle());
 				return true;
+			case R.id.action_forum_sharing_status:
+				Intent i3 = new Intent(this, ForumSharingStatusActivity.class);
+				i3.setFlags(FLAG_ACTIVITY_CLEAR_TOP | FLAG_ACTIVITY_SINGLE_TOP);
+				i3.putExtra(GROUP_ID, groupId.getBytes());
+				ActivityCompat.startActivity(this, i3, options.toBundle());
+				return true;
 			case R.id.action_forum_delete:
 				showUnsubscribeDialog();
 				return true;

briar-android/src/org/briarproject/android/forum/ForumSharingStatusActivity.java

@@ -0,0 +1,169 @@
+package org.briarproject.android.forum;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.support.v7.widget.LinearLayoutManager;
+import android.view.MenuItem;
+
+import org.briarproject.R;
+import org.briarproject.android.ActivityComponent;
+import org.briarproject.android.BriarActivity;
+import org.briarproject.android.contact.ContactListItem;
+import org.briarproject.android.util.BriarRecyclerView;
+import org.briarproject.api.contact.Contact;
+import org.briarproject.api.db.DbException;
+import org.briarproject.api.forum.ForumSharingManager;
+import org.briarproject.api.identity.IdentityManager;
+import org.briarproject.api.identity.LocalAuthor;
+import org.briarproject.api.sync.GroupId;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.List;
+import java.util.logging.Logger;
+
+import javax.inject.Inject;
+
+import static java.util.logging.Level.WARNING;
+
+public class ForumSharingStatusActivity extends BriarActivity {
+
+	private GroupId groupId;
+	private BriarRecyclerView sharedByList, sharedWithList;
+	private ForumSharingStatusAdapter sharedByAdapter, sharedWithAdapter;
+
+	// Fields that are accessed from background threads must be volatile
+	@Inject
+	protected volatile ForumSharingManager forumSharingManager;
+	@Inject
+	protected volatile IdentityManager identityManager;
+
+	public final static String TAG = "ForumSharingStatusActivity";
+	private static final Logger LOG = Logger.getLogger(TAG);
+
+	@Override
+	public void onCreate(Bundle savedInstanceState) {
+		super.onCreate(savedInstanceState);
+
+		setContentView(R.layout.activity_forum_sharing_status);
+
+		Intent i = getIntent();
+		byte[] b = i.getByteArrayExtra(GROUP_ID);
+		if (b == null) throw new IllegalStateException("No GroupId");
+		groupId = new GroupId(b);
+
+		sharedByList = (BriarRecyclerView) findViewById(R.id.sharedByView);
+		sharedByAdapter = new ForumSharingStatusAdapter(this);
+		sharedByList.setLayoutManager(new LinearLayoutManager(this));
+		sharedByList.setAdapter(sharedByAdapter);
+		sharedByList.setEmptyText(getString(R.string.nobody));
+
+		sharedWithList = (BriarRecyclerView) findViewById(R.id.sharedWithView);
+		sharedWithAdapter = new ForumSharingStatusAdapter(this);
+		sharedWithList.setLayoutManager(new LinearLayoutManager(this));
+		sharedWithList.setAdapter(sharedWithAdapter);
+		sharedWithList.setEmptyText(getString(R.string.nobody));
+	}
+
+	@Override
+	public void onResume() {
+		super.onResume();
+
+		loadSharedBy();
+		loadSharedWith();
+	}
+
+	@Override
+	public boolean onOptionsItemSelected(final MenuItem item) {
+		// Handle presses on the action bar items
+		switch (item.getItemId()) {
+			case android.R.id.home:
+				onBackPressed();
+				return true;
+			default:
+				return super.onOptionsItemSelected(item);
+		}
+	}
+
+	@Override
+	public void injectActivity(ActivityComponent component) {
+		component.inject(this);
+	}
+
+	private void loadSharedBy() {
+		dbController.runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				List<ContactListItem> contactItems = new ArrayList<>();
+				try {
+					Collection<Contact> contacts =
+							forumSharingManager.getSharedBy(groupId);
+					for (Contact c : contacts) {
+						LocalAuthor localAuthor = identityManager
+								.getLocalAuthor(c.getLocalAuthorId());
+						ContactListItem item =
+								new ContactListItem(c, localAuthor, false, null,
+										null);
+						contactItems.add(item);
+					}
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
+				displaySharedBy(contactItems);
+			}
+		});
+	}
+
+	private void displaySharedBy(final List<ContactListItem> contacts) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				if (contacts.isEmpty()) {
+					sharedByList.showData();
+				} else {
+					sharedByAdapter.addAll(contacts);
+				}
+			}
+		});
+	}
+
+	private void loadSharedWith() {
+		dbController.runOnDbThread(new Runnable() {
+			@Override
+			public void run() {
+				List<ContactListItem> contactItems = new ArrayList<>();
+				try {
+					Collection<Contact> contacts =
+							forumSharingManager.getSharedWith(groupId);
+					for (Contact c : contacts) {
+						LocalAuthor localAuthor = identityManager
+								.getLocalAuthor(c.getLocalAuthorId());
+						ContactListItem item =
+								new ContactListItem(c, localAuthor, false, null,
+										null);
+						contactItems.add(item);
+					}
+				} catch (DbException e) {
+					if (LOG.isLoggable(WARNING))
+						LOG.log(WARNING, e.toString(), e);
+				}
+				displaySharedWith(contactItems);
+			}
+		});
+	}
+
+	private void displaySharedWith(final List<ContactListItem> contacts) {
+		runOnUiThread(new Runnable() {
+			@Override
+			public void run() {
+				if (contacts.isEmpty()) {
+					sharedWithList.showData();
+				} else {
+					sharedWithAdapter.addAll(contacts);
+				}
+			}
+		});
+	}
+
+}

briar-android/src/org/briarproject/android/forum/ForumSharingStatusAdapter.java

@@ -0,0 +1,36 @@
+package org.briarproject.android.forum;
+
+import android.content.Context;
+import android.support.v4.content.ContextCompat;
+import android.text.format.DateUtils;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ImageView;
+import android.widget.TextView;
+
+import org.briarproject.R;
+import org.briarproject.android.contact.BaseContactListAdapter;
+import org.briarproject.android.contact.ContactListItem;
+
+public class ForumSharingStatusAdapter
+		extends BaseContactListAdapter<BaseContactListAdapter.BaseContactHolder> {
+
+	public ForumSharingStatusAdapter(Context context) {
+		super(context, null);
+	}
+
+	@Override
+	public BaseContactHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
+		View v = LayoutInflater.from(viewGroup.getContext()).inflate(
+				R.layout.list_item_contact_small, viewGroup, false);
+
+		return new BaseContactHolder(v);
+	}
+
+	@Override
+	public int compareContactListItems(ContactListItem c1, ContactListItem c2) {
+		return compareByName(c1, c2);
+	}
+
+}

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

@@ -120,10 +120,11 @@ public class BriarRecyclerView extends FrameLayout {
 				emptyView.setVisibility(VISIBLE);
 				recyclerView.setVisibility(INVISIBLE);
 			} else {
-				emptyView.setVisibility(INVISIBLE);
+				// use GONE here so empty view doesn't use space on small lists
+				emptyView.setVisibility(GONE);
 				recyclerView.setVisibility(VISIBLE);
 			}
-			progressBar.setVisibility(INVISIBLE);
+			progressBar.setVisibility(GONE);
 		}
 	}