Merge branch '576-empty-state-messages-are-briefly-shown-when-they-shouldn-t' into 'master'

Prevent empty state messages from showing briefly

When we clear a list in `onPause()`, the proper behavior is that the empty state
message is shown, because the list is indeed empty.

However, we will reload the list content again in `onResume()`,
so the fix chosen in this MR is to force showing the progress bar
right after clearing the list.

Closes #576

See merge request !267

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

@@ -82,6 +82,7 @@ public class MyBlogsFragment extends BaseFragment {
 	public void onResume() {
 		super.onResume();
 		adapter.clear();
+		list.showProgressBar();
 		loadBlogs();
 	}
 

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

@@ -192,8 +192,9 @@ public class ContactListFragment extends BaseFragment implements EventListener {
 	@Override
 	public void onPause() {
 		super.onPause();
-		adapter.clear();
 		eventBus.removeListener(this);
+		adapter.clear();
+		list.showProgressBar();
 		list.stopPeriodicUpdate();
 	}
 

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

@@ -119,6 +119,7 @@ public class ForumListFragment extends BaseEventFragment implements
 		super.onPause();
 
 		adapter.clear();
+		list.showProgressBar();
 		list.stopPeriodicUpdate();
 	}
 

briar-android/src/org/briarproject/android/introduction/ContactChooserFragment.java

@@ -140,6 +140,7 @@ public class ContactChooserFragment extends BaseFragment {
 	public void onPause() {
 		super.onPause();
 		adapter.clear();
+		list.showProgressBar();
 	}
 
 	@Override

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

@@ -28,6 +28,7 @@ abstract class InvitationsActivity extends BriarActivity
 			Logger.getLogger(InvitationsActivity.class.getName());
 
 	private InvitationAdapter adapter;
+	private BriarRecyclerView list;
 
 	@Inject
 	protected EventBus eventBus;
@@ -40,8 +41,8 @@ abstract class InvitationsActivity extends BriarActivity
 
 		adapter = getAdapter(this, this);
 
-		BriarRecyclerView list =
-				(BriarRecyclerView) findViewById(R.id.invitationsView);
+
+		list = (BriarRecyclerView) findViewById(R.id.invitationsView);
 		if (list != null) {
 			list.setLayoutManager(new LinearLayoutManager(this));
 			list.setAdapter(adapter);
@@ -60,6 +61,7 @@ abstract class InvitationsActivity extends BriarActivity
 		super.onPause();
 		eventBus.removeListener(this);
 		adapter.clear();
+		list.showProgressBar();
 	}
 
 	@Override