The room list is a recycler view

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainContract.java

 package chat.rocket.android.fragment.sidebar;
 
+import android.support.annotation.NonNull;
+
 import java.util.List;
 import chat.rocket.android.shared.BaseContract;
 import chat.rocket.core.models.Room;
@@ -13,7 +15,7 @@ public interface SidebarMainContract {
 
     void showEmptyScreen();
 
-    void showRoomList(List<Room> roomList);
+    void showRoomList(@NonNull List<Room> roomList);
 
     void showUser(User user);
   }

app/src/main/java/chat/rocket/android/fragment/sidebar/SidebarMainFragment.java

 package chat.rocket.android.fragment.sidebar;
 
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.DialogFragment;
+import android.support.v7.widget.LinearLayoutManager;
+import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.widget.CompoundButton;
 import android.widget.ImageView;
-import android.widget.LinearLayout;
 import android.widget.TextView;
 import com.jakewharton.rxbinding.widget.RxCompoundButton;
 
+import java.util.ArrayList;
 import java.util.List;
 import chat.rocket.android.BuildConfig;
 import chat.rocket.android.R;
@@ -20,7 +23,11 @@ import chat.rocket.android.fragment.sidebar.dialog.AbstractAddRoomDialogFragment
 import chat.rocket.android.fragment.sidebar.dialog.AddChannelDialogFragment;
 import chat.rocket.android.fragment.sidebar.dialog.AddDirectMessageDialogFragment;
 import chat.rocket.android.helper.TextUtils;
-import chat.rocket.android.layouthelper.chatroom.RoomListManager;
+import chat.rocket.android.layouthelper.chatroom.roomlist.ChannelRoomListHeader;
+import chat.rocket.android.layouthelper.chatroom.roomlist.DirectMessageRoomListHeader;
+import chat.rocket.android.layouthelper.chatroom.roomlist.RoomListAdapter;
+import chat.rocket.android.layouthelper.chatroom.roomlist.RoomListHeader;
+import chat.rocket.android.layouthelper.chatroom.roomlist.UnreadRoomListHeader;
 import chat.rocket.core.interactors.RoomInteractor;
 import chat.rocket.core.models.Room;
 import chat.rocket.core.models.User;
@@ -36,7 +43,7 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
 
   private SidebarMainContract.Presenter presenter;
 
-  private RoomListManager roomListManager;
+  private RoomListAdapter adapter;
 
   private String hostname;
 
@@ -93,19 +100,17 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
     setupUserActionToggle();
     setupUserStatusButtons();
     setupLogoutButton();
-    setupAddChannelButton();
     setupVersionInfo();
 
-    roomListManager = new RoomListManager(
-        rootView.findViewById(R.id.unread_title),
-        (LinearLayout) rootView.findViewById(R.id.unread_container),
-        (LinearLayout) rootView.findViewById(R.id.channels_container),
-        (LinearLayout) rootView.findViewById(R.id.direct_messages_container));
-    roomListManager.setOnItemClickListener(view -> {
-      RocketChatCache.get(view.getContext()).edit()
-          .putString(RocketChatCache.KEY_SELECTED_ROOM_ID, view.getRoomId())
-          .apply();
-    });
+    adapter = new RoomListAdapter();
+    adapter.setOnItemClickListener(room -> RocketChatCache.get(getContext()).edit()
+        .putString(RocketChatCache.KEY_SELECTED_ROOM_ID, room.getRoomId())
+        .apply());
+
+    RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.room_list_container);
+    recyclerView.setLayoutManager(
+        new LinearLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false));
+    recyclerView.setAdapter(adapter);
   }
 
   private void setupUserActionToggle() {
@@ -152,10 +157,25 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
   }
 
   private void updateRoomListMode(User user) {
-    if (user == null || user.getSettings() == null || user.getSettings().getPreferences() == null) {
-      return;
+    final List<RoomListHeader> roomListHeaders = new ArrayList<>();
+
+    if (user != null && user.getSettings() != null && user.getSettings().getPreferences() != null
+        && user.getSettings().getPreferences().isUnreadRoomsMode()) {
+      roomListHeaders.add(new UnreadRoomListHeader(
+          getString(R.string.fragment_sidebar_main_unread_rooms_title)
+      ));
     }
-    roomListManager.setUnreadRoomMode(user.getSettings().getPreferences().isUnreadRoomsMode());
+
+    roomListHeaders.add(new ChannelRoomListHeader(
+        getString(R.string.fragment_sidebar_main_channels_title),
+        () -> showAddRoomDialog(AddChannelDialogFragment.create(hostname))
+    ));
+    roomListHeaders.add(new DirectMessageRoomListHeader(
+        getString(R.string.fragment_sidebar_main_direct_messages_title),
+        () -> showAddRoomDialog(AddDirectMessageDialogFragment.create(hostname))
+    ));
+
+    adapter.setRoomListHeaders(roomListHeaders);
   }
 
   private void setupLogoutButton() {
@@ -173,16 +193,6 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
     }
   }
 
-  private void setupAddChannelButton() {
-    rootView.findViewById(R.id.btn_add_channel).setOnClickListener(view -> {
-      showAddRoomDialog(AddChannelDialogFragment.create(hostname));
-    });
-
-    rootView.findViewById(R.id.btn_add_direct_message).setOnClickListener(view -> {
-      showAddRoomDialog(AddDirectMessageDialogFragment.create(hostname));
-    });
-  }
-
   private void setupVersionInfo() {
     TextView versionInfoView = (TextView) rootView.findViewById(R.id.version_info);
     versionInfoView.setText(getString(R.string.version_info_text, BuildConfig.VERSION_NAME));
@@ -203,8 +213,8 @@ public class SidebarMainFragment extends AbstractFragment implements SidebarMain
   }
 
   @Override
-  public void showRoomList(List<Room> roomList) {
-    roomListManager.setRooms(roomList);
+  public void showRoomList(@NonNull List<Room> roomList) {
+    adapter.setRooms(roomList);
   }
 
   @Override

app/src/main/java/chat/rocket/android/layouthelper/chatroom/RoomListManager.java

-package chat.rocket.android.layouthelper.chatroom;
-
-import android.view.View;
-import android.view.ViewGroup;
-
-import chat.rocket.android.helper.TextUtils;
-import chat.rocket.core.models.Room;
-import chat.rocket.android.widget.internal.RoomListItemView;
-import java.util.List;
-
-/**
- * Utility class for mapping Room list into channel list ViewGroup.
- */
-public class RoomListManager {
-  private View unreadTitle;
-  private ViewGroup unreadRoomsContainer;
-  private ViewGroup channelsContainer;
-  private ViewGroup dmContainer;
-
-  private boolean unreadRoomMode = false;
-
-  private List<Room> roomList;
-
-  /**
-   * Callback interface for List item clicked.
-   */
-  public interface OnItemClickListener {
-    void onItemClick(RoomListItemView roomListItemView);
-  }
-
-  private OnItemClickListener listener;
-
-  /**
-   * constructor with three ViewGroups.
-   */
-  public RoomListManager(View unreadTitle, ViewGroup unreadRoomsContainer,
-                         ViewGroup channelsContainer, ViewGroup dmContainer) {
-    this(unreadTitle, unreadRoomsContainer, channelsContainer, dmContainer, false);
-  }
-
-  /**
-   * constructor with two ViewGroups.
-   */
-  public RoomListManager(View unreadTitle, ViewGroup unreadRoomsContainer,
-                         ViewGroup channelsContainer, ViewGroup dmContainer,
-                         boolean unreadRoomMode) {
-    this.unreadTitle = unreadTitle;
-    this.unreadRoomsContainer = unreadRoomsContainer;
-    this.channelsContainer = channelsContainer;
-    this.dmContainer = dmContainer;
-    this.unreadRoomMode = unreadRoomMode;
-  }
-
-  /**
-   * update ViewGroups with room list.
-   */
-  public void setRooms(List<Room> roomList) {
-    this.roomList = roomList;
-    updateRoomsList();
-  }
-
-  /**
-   * set callback on List item clicked.
-   */
-  public void setOnItemClickListener(OnItemClickListener listener) {
-    this.listener = listener;
-  }
-
-  private void removeDeletedItem(ViewGroup parent, List<Room> roomList) {
-    for (int index = parent.getChildCount() - 1; index >= 0; index--) {
-      RoomListItemView roomListItemView = (RoomListItemView) parent.getChildAt(index);
-      final String targetRoomName = roomListItemView.getRoomName();
-      if (!TextUtils.isEmpty(targetRoomName)) {
-        boolean found = false;
-        for (Room room : roomList) {
-          if (targetRoomName.equals(room.getName())) {
-            found = true;
-            break;
-          }
-        }
-        if (!found) {
-          parent.removeViewAt(index);
-        }
-      }
-    }
-  }
-
-  public void setUnreadRoomMode(boolean unreadRoomMode) {
-    this.unreadRoomMode = unreadRoomMode;
-    updateRoomsList();
-  }
-
-  private void insertOrUpdateItem(ViewGroup parent, Room room) {
-    final String roomName = room.getName();
-
-    int index;
-    for (index = 0; index < parent.getChildCount(); index++) {
-      RoomListItemView roomListItemView = (RoomListItemView) parent.getChildAt(index);
-      final String targetRoomName = roomListItemView.getRoomName();
-      if (roomName.equals(targetRoomName)) {
-        updateRoomItemView(roomListItemView, room);
-        return;
-      }
-      if (roomName.compareToIgnoreCase(targetRoomName) < 0) {
-        break;
-      }
-    }
-
-    RoomListItemView roomListItemView = new RoomListItemView(parent.getContext());
-    updateRoomItemView(roomListItemView, room);
-    if (index == parent.getChildCount()) {
-      parent.addView(roomListItemView);
-    } else {
-      parent.addView(roomListItemView, index);
-    }
-  }
-
-  private void updateRoomItemView(RoomListItemView roomListItemView,
-                                  Room room) {
-    roomListItemView
-        .setRoomId(room.getRoomId())
-        .setRoomName(room.getName())
-        .setRoomType(room.getType())
-        .setAlert(room.isAlert())
-        .setUnreadCount(room.getUnread());
-
-    roomListItemView.setOnClickListener(this::onItemClick);
-  }
-
-  private void onItemClick(View view) {
-    if (view instanceof RoomListItemView && listener != null) {
-      listener.onItemClick((RoomListItemView) view);
-    }
-  }
-
-  private void updateRoomsList() {
-    if (roomList == null) {
-      return;
-    }
-
-    removeDeletedItem(unreadRoomsContainer, roomList);
-    removeDeletedItem(channelsContainer, roomList);
-    removeDeletedItem(dmContainer, roomList);
-
-    for (Room room : roomList) {
-      String name = room.getName();
-      if (TextUtils.isEmpty(name)) {
-        continue;
-      }
-
-      String type = room.getType();
-
-      if (unreadRoomMode && room.isAlert()) {
-        insertOrUpdateItem(unreadRoomsContainer, room);
-        removeItemIfExists(channelsContainer, name);
-        removeItemIfExists(dmContainer, name);
-      } else if (Room.TYPE_CHANNEL.equals(type)
-          || Room.TYPE_PRIVATE.equals(type)) {
-        removeItemIfExists(unreadRoomsContainer, name);
-        insertOrUpdateItem(channelsContainer, room);
-        removeItemIfExists(dmContainer, name);
-      } else if (Room.TYPE_DIRECT_MESSAGE.equals(type)) {
-        removeItemIfExists(unreadRoomsContainer, name);
-        removeItemIfExists(channelsContainer, name);
-        insertOrUpdateItem(dmContainer, room);
-      }
-    }
-
-    boolean showUnread = unreadRoomMode && unreadRoomsContainer.getChildCount() != 0;
-    unreadTitle.setVisibility(showUnread ? View.VISIBLE : View.GONE);
-    unreadRoomsContainer.setVisibility(showUnread ? View.VISIBLE : View.GONE);
-  }
-
-  private static void removeItemIfExists(ViewGroup parent, String roomName) {
-    for (int i = 0; i < parent.getChildCount(); i++) {
-      RoomListItemView roomListItemView = (RoomListItemView) parent.getChildAt(i);
-      if (roomName.equals(roomListItemView.getRoomName())) {
-        parent.removeViewAt(i);
-        break;
-      }
-    }
-  }
-}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/ChannelRoomListHeader.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.annotation.NonNull;
+
+import java.util.List;
+import chat.rocket.core.models.Room;
+
+public class ChannelRoomListHeader implements RoomListHeader {
+
+  private final String title;
+  private final ClickListener clickListener;
+
+  public ChannelRoomListHeader(String title, ClickListener clickListener) {
+    this.title = title;
+    this.clickListener = clickListener;
+  }
+
+  @Override
+  public String getTitle() {
+    return title;
+  }
+
+  @Override
+  public boolean owns(Room room) {
+    return room.isChannel() || room.isPrivate();
+  }
+
+  @Override
+  public boolean shouldShow(@NonNull List<Room> roomList) {
+    return true;
+  }
+
+  @Override
+  public ClickListener getClickListener() {
+    return clickListener;
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/DirectMessageRoomListHeader.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.annotation.NonNull;
+
+import java.util.List;
+import chat.rocket.core.models.Room;
+
+public class DirectMessageRoomListHeader implements RoomListHeader {
+
+  private final String title;
+  private final ClickListener clickListener;
+
+  public DirectMessageRoomListHeader(String title, ClickListener clickListener) {
+    this.title = title;
+    this.clickListener = clickListener;
+  }
+
+  @Override
+  public String getTitle() {
+    return title;
+  }
+
+  @Override
+  public boolean owns(Room room) {
+    return room.isDirectMessage();
+  }
+
+  @Override
+  public boolean shouldShow(@NonNull List<Room> roomList) {
+    return true;
+  }
+
+  @Override
+  public ClickListener getClickListener() {
+    return clickListener;
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/RoomListAdapter.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.annotation.NonNull;
+import android.support.v7.widget.RecyclerView;
+import android.view.LayoutInflater;
+import android.view.ViewGroup;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import chat.rocket.android.R;
+import chat.rocket.android.widget.internal.RoomListItemView;
+import chat.rocket.core.models.Room;
+
+public class RoomListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
+
+  private static final int VIEW_TYPE_HEADER = 0;
+  private static final int VIEW_TYPE_ROOM = 1;
+
+  private List<Room> roomList = Collections.emptyList();
+  private List<RoomListHeader> roomListHeaders = Collections.emptyList();
+  private Map<Integer, RoomListHeader> headersPosition = new HashMap<>();
+
+  private OnItemClickListener externalListener;
+  private OnItemClickListener listener = room -> {
+    if (externalListener != null) {
+      externalListener.onItemClick(room);
+    }
+  };
+
+  public void setRoomListHeaders(@NonNull List<RoomListHeader> roomListHeaders) {
+    this.roomListHeaders = roomListHeaders;
+    updateRoomList();
+  }
+
+  public void setRooms(@NonNull List<Room> roomList) {
+    this.roomList = roomList;
+    updateRoomList();
+  }
+
+  public void setOnItemClickListener(OnItemClickListener onItemClickListener) {
+    externalListener = onItemClickListener;
+  }
+
+  @Override
+  public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
+    if (viewType == VIEW_TYPE_HEADER) {
+      return new RoomListHeaderViewHolder(
+          LayoutInflater.from(parent.getContext())
+              .inflate(R.layout.room_list_header, parent, false)
+      );
+    }
+    return new RoomListItemViewHolder(new RoomListItemView(parent.getContext()), listener);
+  }
+
+  @Override
+  public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
+    if (getItemViewType(position) == VIEW_TYPE_HEADER) {
+      ((RoomListHeaderViewHolder) holder)
+          .bind(headersPosition.get(position));
+      return;
+    }
+
+    ((RoomListItemViewHolder) holder)
+        .bind(roomList.get(position - getTotalHeadersBeforePosition(position)));
+  }
+
+  @Override
+  public int getItemCount() {
+    return roomList.size() + headersPosition.size();
+  }
+
+  @Override
+  public int getItemViewType(int position) {
+    if (headersPosition.containsKey(position)) {
+      return VIEW_TYPE_HEADER;
+    }
+    return VIEW_TYPE_ROOM;
+  }
+
+  private void updateRoomList() {
+    sortRoomList();
+    calculateHeadersPosition();
+    notifyDataSetChanged();
+  }
+
+  private void sortRoomList() {
+    int totalHeaders = roomListHeaders.size();
+
+    Collections.sort(roomList, (room, anotherRoom) -> {
+      for (int i = 0; i < totalHeaders; i++) {
+        final RoomListHeader header = roomListHeaders.get(i);
+
+        if (header.owns(room) && !header.owns(anotherRoom)) {
+          return -1;
+        } else if (!header.owns(room) && header.owns(anotherRoom)) {
+          return 1;
+        }
+      }
+
+      return room.getName().compareTo(anotherRoom.getName());
+    });
+  }
+
+  private void calculateHeadersPosition() {
+    headersPosition.clear();
+
+    int roomIdx = 0;
+    int totalRooms = roomList.size();
+    int totalHeaders = roomListHeaders.size();
+    for (int i = 0; i < totalHeaders; i++) {
+      final RoomListHeader header = roomListHeaders.get(i);
+      if (!header.shouldShow(roomList)) {
+        continue;
+      }
+
+      headersPosition.put(roomIdx + headersPosition.size(), header);
+
+      for (; roomIdx < totalRooms; roomIdx++) {
+        final Room room = roomList.get(roomIdx);
+        if (!header.owns(room)) {
+          break;
+        }
+      }
+    }
+  }
+
+  private int getTotalHeadersBeforePosition(int position) {
+    int totalHeaders = headersPosition.size();
+    Integer[] keySet = headersPosition.keySet().toArray(new Integer[totalHeaders]);
+
+    int totalBefore = 0;
+    for (int i = 0; i < totalHeaders; i++) {
+      if (keySet[i] <= position) {
+        totalBefore++;
+      }
+    }
+
+    return totalBefore;
+  }
+
+  public interface OnItemClickListener {
+    void onItemClick(Room room);
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/RoomListHeader.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.annotation.NonNull;
+
+import java.util.List;
+import chat.rocket.core.models.Room;
+
+public interface RoomListHeader {
+
+  String getTitle();
+
+  boolean owns(Room room);
+
+  boolean shouldShow(@NonNull List<Room> roomList);
+
+  ClickListener getClickListener();
+
+  interface ClickListener {
+    void onClick();
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/RoomListHeaderViewHolder.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.v7.widget.RecyclerView;
+import android.view.View;
+import android.widget.Button;
+import android.widget.TextView;
+
+import chat.rocket.android.R;
+
+public class RoomListHeaderViewHolder extends RecyclerView.ViewHolder {
+  private TextView title;
+  private Button button;
+
+
+  public RoomListHeaderViewHolder(View itemView) {
+    super(itemView);
+    title = (TextView) itemView.findViewById(R.id.title);
+    button = (Button) itemView.findViewById(R.id.btn_add);
+  }
+
+  public void bind(RoomListHeader roomListHeader) {
+    final RoomListHeader.ClickListener clickListener = roomListHeader.getClickListener();
+    if (clickListener == null) {
+      button.setVisibility(View.GONE);
+    } else {
+      button.setVisibility(View.VISIBLE);
+      button.setOnClickListener(v -> clickListener.onClick());
+    }
+
+    title.setText(roomListHeader.getTitle());
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/RoomListItemViewHolder.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.v7.widget.RecyclerView;
+
+import chat.rocket.android.widget.internal.RoomListItemView;
+import chat.rocket.core.models.Room;
+
+public class RoomListItemViewHolder extends RecyclerView.ViewHolder {
+  public RoomListItemViewHolder(RoomListItemView itemView,
+                                RoomListAdapter.OnItemClickListener listener) {
+    super(itemView);
+
+    itemView.setOnClickListener(view -> {
+      if (listener != null) {
+        listener.onItemClick((Room) view.getTag());
+      }
+    });
+  }
+
+  public void bind(Room room) {
+    ((RoomListItemView) itemView)
+        .setRoomId(room.getRoomId())
+        .setRoomName(room.getName())
+        .setRoomType(room.getType())
+        .setAlert(room.isAlert())
+        .setUnreadCount(room.getUnread())
+        .setTag(room);
+  }
+}

app/src/main/java/chat/rocket/android/layouthelper/chatroom/roomlist/UnreadRoomListHeader.java

+package chat.rocket.android.layouthelper.chatroom.roomlist;
+
+import android.support.annotation.NonNull;
+
+import java.util.List;
+import chat.rocket.core.models.Room;
+
+public class UnreadRoomListHeader implements RoomListHeader {
+
+  private final String title;
+
+  public UnreadRoomListHeader(String title) {
+    this.title = title;
+  }
+
+  @Override
+  public String getTitle() {
+    return title;
+  }
+
+  @Override
+  public boolean owns(Room room) {
+    return room.isAlert();
+  }
+
+  @Override
+  public boolean shouldShow(@NonNull List<Room> roomList) {
+    for (int i = 0, size = roomList.size(); i < size; i++) {
+      if (roomList.get(i).isAlert()) {
+        return true;
+      }
+    }
+
+    return false;
+  }
+
+  @Override
+  public ClickListener getClickListener() {
+    return null;
+  }
+}

app/src/main/res/layout/fragment_sidebar_main.xml

@@ -55,108 +55,13 @@
 
     </LinearLayout>
 
-    <android.support.v4.widget.NestedScrollView
+    <android.support.v7.widget.RecyclerView
+            android:id="@+id/room_list_container"
             android:layout_width="match_parent"
-            android:layout_height="wrap_content"
-            android:layout_alignParentBottom="true"
+            android:layout_height="match_parent"
             android:layout_below="@+id/user_info_container"
-            android:background="?attr/colorPrimary">
-
-        <LinearLayout
-                android:layout_width="match_parent"
-                android:layout_height="wrap_content"
-                android:orientation="vertical"
-                android:paddingStart="?attr/listPreferredItemPaddingLeft"
-                android:paddingLeft="?attr/listPreferredItemPaddingLeft">
-
-            <TextView
-                    android:id="@+id/unread_title"
-                    android:layout_marginTop="@dimen/margin_8"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:gravity="center_vertical"
-                    android:minHeight="48dp"
-                    android:alpha="0.62"
-                    android:text="@string/fragment_sidebar_main_unread_rooms_title"
-                    android:textAppearance="@style/TextAppearance.AppCompat.Body2"
-                    android:textStyle="bold" />
-
-            <LinearLayout
-                    android:id="@+id/unread_container"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginEnd="?attr/listPreferredItemPaddingRight"
-                    android:orientation="vertical"
-                    android:layout_marginRight="?attr/listPreferredItemPaddingRight" />
-
-            <FrameLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="@dimen/margin_8">
-
-                <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:layout_gravity="start|center_vertical"
-                        android:alpha="0.62"
-                        android:text="@string/fragment_sidebar_main_channels_title"
-                        android:textAppearance="@style/TextAppearance.AppCompat.Body2"
-                        android:textStyle="bold" />
-
-                <io.github.yusukeiwaki.android.widget.FontAwesomeButton
-                        android:id="@+id/btn_add_channel"
-                        style="@style/Widget.AppCompat.Button.Borderless"
-                        android:layout_width="48dp"
-                        android:layout_height="48dp"
-                        android:layout_gravity="end|center_vertical"
-                        android:text="@string/fa_plus"
-                        android:textSize="12dp" />
-
-            </FrameLayout>
-
-            <LinearLayout
-                    android:id="@+id/channels_container"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginEnd="?attr/listPreferredItemPaddingRight"
-                    android:orientation="vertical"
-                    android:layout_marginRight="?attr/listPreferredItemPaddingRight" />
-
-            <FrameLayout
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginTop="@dimen/margin_8">
-
-                <TextView
-                        android:layout_width="wrap_content"
-                        android:layout_height="wrap_content"
-                        android:layout_gravity="start|center_vertical"
-                        android:alpha="0.62"
-                        android:text="@string/fragment_sidebar_main_direct_messages_title"
-                        android:textAppearance="@style/TextAppearance.AppCompat.Body2"
-                        android:textStyle="bold" />
-
-                <io.github.yusukeiwaki.android.widget.FontAwesomeButton
-                        android:id="@+id/btn_add_direct_message"
-                        style="@style/Widget.AppCompat.Button.Borderless"
-                        android:layout_width="48dp"
-                        android:layout_height="48dp"
-                        android:layout_gravity="end|center_vertical"
-                        android:text="@string/fa_plus"
-                        android:textSize="12dp" />
-
-            </FrameLayout>
-
-            <LinearLayout
-                    android:id="@+id/direct_messages_container"
-                    android:layout_width="match_parent"
-                    android:layout_height="wrap_content"
-                    android:layout_marginEnd="?attr/listPreferredItemPaddingRight"
-                    android:orientation="vertical"
-                    android:layout_marginRight="?attr/listPreferredItemPaddingRight" />
-
-        </LinearLayout>
-    </android.support.v4.widget.NestedScrollView>
+            android:layout_alignParentBottom="true"
+            android:background="?attr/colorPrimary" />
 
     <android.support.v4.widget.NestedScrollView
             android:id="@+id/user_action_outer_container"
@@ -167,7 +72,7 @@
             android:background="?attr/colorPrimaryDark"
             android:elevation="2dp"
             android:visibility="gone"
-            tools:visibility="visible">
+            tools:visibility="gone">
 
         <LinearLayout
                 android:layout_width="match_parent"

app/src/main/res/layout/room_list_header.xml

+<?xml version="1.0" encoding="utf-8"?>
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:minHeight="48dp"
+        android:layout_marginTop="@dimen/margin_8"
+        android:paddingStart="?attr/listPreferredItemPaddingLeft"
+        android:paddingLeft="?attr/listPreferredItemPaddingLeft">
+
+    <TextView
+            android:id="@+id/title"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:layout_gravity="start|center_vertical"
+            android:alpha="0.62"
+            android:text="@string/fragment_sidebar_main_channels_title"
+            android:textAppearance="@style/TextAppearance.AppCompat.Body2"
+            android:textStyle="bold" />
+
+    <io.github.yusukeiwaki.android.widget.FontAwesomeButton
+            android:id="@+id/btn_add"
+            style="@style/Widget.AppCompat.Button.Borderless"
+            android:layout_width="48dp"
+            android:layout_height="48dp"
+            android:layout_gravity="end|center_vertical"
+            android:text="@string/fa_plus"
+            android:textSize="12dp" />
+
+</FrameLayout>
\ No newline at end of file

rocket-chat-android-widgets/src/main/java/chat/rocket/android/widget/internal/RoomListItemView.java

@@ -6,6 +6,7 @@ import android.content.res.TypedArray;
 import android.os.Build;
 import android.util.AttributeSet;
 import android.view.View;
+import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.TextView;
 
@@ -15,7 +16,7 @@ import chat.rocket.android.widget.R;
 /**
  * Room list-item view used in sidebar.
  */
-public class RoomListItemView extends LinearLayout {
+public class RoomListItemView extends FrameLayout {
   private static HashMap<String, Integer> ICON_TABLE = new HashMap<String, Integer>() {
     {
       put("c", R.string.fa_hashtag);
@@ -48,7 +49,8 @@ public class RoomListItemView extends LinearLayout {
   }
 
   private void initialize(Context context) {
-    setOrientation(HORIZONTAL);
+    setLayoutParams(new LinearLayout.LayoutParams(
+        LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));
 
     TypedArray array2 = context.getTheme().obtainStyledAttributes(new int[]{
         R.attr.selectableItemBackground

rocket-chat-android-widgets/src/main/res/layout/room_list_item.xml

 <?xml version="1.0" encoding="utf-8"?>
-<merge xmlns:android="http://schemas.android.com/apk/res/android"
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
         android:layout_width="match_parent"
-        android:layout_height="wrap_content">
+        android:layout_height="wrap_content"
+        android:paddingStart="?attr/listPreferredItemPaddingLeft"
+        android:paddingLeft="?attr/listPreferredItemPaddingLeft"
+        android:paddingRight="?attr/listPreferredItemPaddingRight"
+        android:paddingEnd="?attr/listPreferredItemPaddingRight">
 
     <FrameLayout
             android:layout_width="32dp"
@@ -19,7 +23,7 @@
 
     <TextView
             android:id="@+id/text"
-            android:layout_width="wrap_content"
+            android:layout_width="0dp"
             android:layout_height="?attr/listPreferredItemHeightSmall"
             android:layout_weight="1"
             android:gravity="center_vertical"
@@ -44,4 +48,4 @@
                 android:layout_gravity="center"
                 android:textAppearance="@style/TextAppearance.AppCompat.Body1" />
     </FrameLayout>
-</merge>
+</LinearLayout>
\ No newline at end of file

rocket-chat-core/src/main/java/chat/rocket/core/models/Room.java

@@ -27,6 +27,18 @@ public abstract class Room {
 
   public abstract long getLastSeen();
 
+  public boolean isChannel() {
+    return TYPE_CHANNEL.equals(getType());
+  }
+
+  public boolean isPrivate() {
+    return TYPE_PRIVATE.equals(getType());
+  }
+
+  public boolean isDirectMessage() {
+    return TYPE_DIRECT_MESSAGE.equals(getType());
+  }
+
   public static Builder builder() {
     return new AutoValue_Room.Builder();
   }