UI for Sharing Blogs

This commit refactors the code for sharing forums,
so it can be used for sharing blogs as well.

It does not yet include code for responding to blog invitations.

briar-android/src/org/briarproject/android/sharing/SharingStatusActivity.java

@@ -0,0 +1,169 @@
+package org.briarproject.android.sharing;
+
+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 SharingStatusActivity extends BriarActivity {
+
+	private GroupId groupId;
+	private BriarRecyclerView sharedByList, sharedWithList;
+	private SharingStatusAdapter 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 SharingStatusAdapter(this);
+		sharedByList.setLayoutManager(new LinearLayoutManager(this));
+		sharedByList.setAdapter(sharedByAdapter);
+		sharedByList.setEmptyText(getString(R.string.nobody));
+
+		sharedWithList = (BriarRecyclerView) findViewById(R.id.sharedWithView);
+		sharedWithAdapter = new SharingStatusAdapter(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);
+				}
+			}
+		});
+	}
+
+}