Open channel

public class OpenChannelActivity extends AppCompatActivity {
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sb_activity);
        OpenChannelFragment fragment = createOpenChannelFragment(CHANNEL_URL);
        // Put the Fragment in the view.
    }

    protected OpenChannelFragment createOpenChannelFragment(@NonNull String channelUrl) {
        return new OpenChannelFragment.Builder(channelUrl)
            .setUseHeader(true)
            .build();
    }
}

OpenChannelFragment fragment = new OpenChannelFragment.Builder(CHANNEL_URL)
    .setCustomOpenChannelFragment(new CustomOpenChannelFragment())
    .setUseHeader(true)
    .setHeaderTitle(channelName)
    .setHeaderDescription(participantsCount)
    .setUseHeaderLeftButton(true)
    .setUseHeaderRightButton(true)
    .setHeaderLeftButtonIconResId(R.drawable.icon_arrow_left)
    .setHeaderRightButtonIconResId(R.drawable.icon_info)
    .setInputLeftButtonIconResId(R.drawable.icon_add)
    .setInputRightButtonIconResId(R.drawable.icon_send)
    .setInputHint("Type here")
    .setHeaderLeftButtonListener(leftButtonListener)
    .setHeaderRightButtonListener(rightButtonListener)
    .setOpenChannelMessageListAdapter(adapter)
    .setListItemClickListener(listItemClickListener)
    .setListItemLongClickListener(listItemLongClickListener)
    .showInputRightButtonAlways()
    .setInputLeftButtonListener(inputLeftButtonListener)
    .setMessageListParams(params)
    .setUseMessageGroupUI(true)
    .setUseUserProfile(false)
    .useOverlayMode()
    .setHeaderDescription(participantsCount)
    .setKeyboardDisplayType(keyboardDisplayType)
    .setLoadingDialogHandler(loadingDialogHandler)
    .setEmptyIcon(R.drawable.icon_message)
    .setEmptyText("No messages")
    .setOnEditModeTextChangedListener(null)
    .setInputText(null)
    .setOnInputTextChangedListener(null)
    .build();

OpenChannelFragment fragment = new OpenChannelFragment.Builder(CHANNEL_URL)
    .useOverlayMode()
    .build();

builder.setListItemClickListener(new OnIdentifiableItemClickListener<BaseMessage>() {
    @Override
    public void onIdentifiableItemClick(View view, String identifier, int position, BaseMessage message) {
        MessageType type = MessageViewHolderFactory.getMessageType(message);
        // Add custom implementation for an message view holder clicked event.
        switch (identifier) {
            case StringSet.Chat:
                // ClickableViewType.Chat
            case StringSet.Profile:
                // ClickableViewType.Profile
            case StringSet.QuoteReply:
                // ClickableViewType.Reply
        }
    }
}).setListItemLongClickListener(new OnIdentifiableItemLongClickListener<BaseMessage>() {
    @Override
    public void onIdentifiableItemLongClick(View view, String identifier, int position, BaseMessage message) {
        MessageType type = MessageViewHolderFactory.getMessageType(message);
        // Add custom implementation for an message view holder long clicked event.
        switch (identifier) {
            case StringSet.Chat:
                // ClickableViewType.Chat
            case StringSet.Profile:
                // ClickableViewType.Profile
            case StringSet.QuoteReply:
                // ClickableViewType.Reply
        }
    }
});

public class CustomOpenChannelMessageListAdapter extends OpenChannelMessageListAdapter {
    public CustomOpenChannelMessageListAdapter(OpenChannel channel) {
        super(channel);
    }

    @NonNull
    @Override
    public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // Create the custom ViewHolder and return it.
        // Create your custom ViewHolder or call super.onCreateViewHolder() if you want to use the default.
        return new CREATE_YOUR_CUSTOM_VIEWHOLDER();
    }

    @Override
    public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
        // You must call the super. You can use methods that MessageViewHolder provides
        super.onBindViewHolder(holder, position);
        // Bind the custom ViewHolder.
    }

    @Override
    public int getItemViewType(int position) {
        BaseMessage message = getItem(position);
        // Create a message type using a BaseMessage object.
        // If you want to use holders that UIKit provides, you have to call the super.
        // If you want to implement a custom message type, set the type as a number greater than 1,000.
        return super.getItemViewType(position);
   }
}

public class CustomMessageViewHolder extends MessageViewHolder {
    public CustomMessageViewHolder(View view) {
        super(view);
    }

    @Override
    public void bind(BaseChannel channel, @NonNull BaseMessage message) {
        // Bind the data to the view holder.
    }

    @Override
    public Map<String, View> getClickableViewMap() {
        // Put clickable views with identifers.
        clickableViewMap.put(ClickableViewIdentifier.Chat.name(), chatView);
        clickableViewMap.put(ClickableViewIdentifier.Profile.name(), profileView);
        clickableViewMap.put(ClickableViewIdentifier.QuoteReply.name(), quoteReplyView);
        return clickableViewMap;
    }
}

builder.setOpenChannelMessageListAdapter(new CustomOpenChannelMessageListAdapter());

<style name="Custom" parent="SendBird">
    <item name="sb_channel_message_list_style">CustomMessageList</item>
    <item name="sb_open_channel_message_user_style">CustomUserMessage</item>
    <item name="sb_open_channel_message_file_style">CustomFileMessage</item>
    <item name="sb_open_channel_message_admin_style">CustomAdminMessage</item>
    <item name="sb_message_timeline_style">CustomTimelineMessage</item>
    <item name="sb_message_input_style">CustomMessageInput</item>
</style>

<style name="CustomMessageList" parent="Widget.SendBird.RecyclerView.Message">
    <item name="sb_pager_recycler_view_use_divide_line"></item>
    <item name="sb_message_recyclerview_background"></item>
    <item name="sb_message_recyclerview_tooltip_background"></item>
    <item name="sb_message_recyclerview_tooltip_textappearance"></item>
</style>

<style name="CustomMessage" parent="Widget.SendBird.OpenChannel.Message">
    <item name="sb_message_time_text_appearance"></item>
    <item name="sb_message_sender_name_text_appearance"></item>
    <item name="sb_message_operator_name_text_appearance"></item>
</style>

<style name="CustomUserMessage" parent="Widget.SendBird.OpenChannel.Message.User">
    <item name="sb_message_time_text_appearance"></item>
    <item name="sb_message_sender_name_text_appearance"></item>
    <item name="sb_message_operator_name_text_appearance"></item>
    <item name="sb_message_background"></item>
    <item name="sb_message_text_appearance"></item>
    <item name="sb_message_ogtag_background"></item>
    <item name="sb_message_ogtag_title_appearance"></item>
    <item name="sb_message_ogtag_description_appearance"></item>
    <item name="sb_message_ogtag_url_appearance"></item>
    <item name="sb_message_link_text_color"></item>
    <item name="sb_message_edited_mark_text_appearance"></item>
</style>

<style name="CustomFileMessage" parent="Widget.SendBird.OpenChannel.Message.File">
    <item name="sb_message_text_appearance"></item>
    <item name="sb_message_background"></item>
</style>

<style name="CustomAdminMessage" parent="Widget.SendBird.OpenChannel.Message.Admin">
    <item name="sb_admin_message_text_appearance"></item>
    <item name="sb_admin_message_background"></item>
</style>

<style name="CustomTimelineMessage" parent="Widget.SendBird.Message.Timeline">
    <item name="sb_message_timeline_text_appearance"></item>
    <item name="sb_message_timeline_background"></item>
</style>

<style name="CustomMessageInput" parent="Widget.SendBird.MessageInput">
    <item name="sb_message_input_background"></item>
    <item name="sb_message_input_text_background"></item>
    <item name="sb_message_input_text_appearance"></item>
    <item name="sb_message_input_text_hint_color"></item>
    <item name="sb_message_input_text_cursor_drawable"></item>
    <item name="sb_message_input_enable"></item>
    <item name="sb_message_input_left_button_tint"></item>
    <item name="sb_message_input_left_button_background"></item>
    <item name="sb_message_input_right_button_tint"></item>
    <item name="sb_message_input_right_button_background"></item>
    <item name="sb_message_input_edit_save_button_text_appearance"></item>
    <item name="sb_message_input_edit_save_button_text_color"></item>
    <item name="sb_message_input_edit_save_button_background"></item>
    <item name="sb_message_input_edit_cancel_button_text_appearance"></item>
    <item name="sb_message_input_edit_cancel_button_text_color"></item>
    <item name="sb_message_input_edit_cancel_button_background"></item>
</style>

new OpenChannelFragment.Builder(CHANNEL_URL, R.style.Custom).build();

Intent intent = ParticipantsListActivity.newIntent(context, CHANNEL_URL);
startActivity(intent);

Intent intent = ParticipantsListActivity.newIntentFromCustomActivity(context, CustomParticipantsListActivity.class, CHANNEL_URL);
startActivity(intent);

public class ParticipantsListActivity extends AppCompatActivity {
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sb_activity);
        ParticipantsListFragment Fragment = createParticipantsListFragment(CHANNEL_URL);
        // Put the Fragment in the view.
    }

    protected ParticipantsListFragment createParticipantsListFragment(@NonNull String channelUrl) {
        return new ParticipantsListFragment.Builder(channelUrl)
            .setUseHeader(true)
            .setHeaderTitle(getString(R.string.sb_text_header_participants))
            .setEmptyIcon(R.drawable.icon_chat)
            .setEmptyText(R.string.sb_text_participants_list_empty)
            .build();
    }
}

ParticipantsListFragment Fragment = new ParticipantsListFragment.Builder(CHANNEL_URL)
    .setCustomParticipantsListFragment(new CustomParticipantsListFragment())
    .setUseHeader(true)
    .setHeaderTitle("Participants")
    .setUseHeaderLeftButton(true)
    .setHeaderLeftButtonIconResId(R.drawable.icon_arrow_left)
    .setHeaderLeftButtonListener(leftButtonListener)
    .setEmptyIcon(R.drawable.icon_chat)
    .setEmptyText(R.string.sb_text_participants_list_empty)
    .setParticipantsListAdapter(adapter)
    .setItemClickListener(itemClickListener)
    .setItemLongClickListener(itemLongClickListener)
    .setUseUserProfile(true)
    .build();

builder.setItemClickListener(new OnItemClickListener<User>() {
    @Override
    public void onItemClick(View view, int position, User data) {
        // Set what action to perform when an item is clicked.
    }
}).setItemLongClickListener(new OnItemLongClickListener<User>() {
    @Override
    public void onItemLongClick(View view, int position, User data) {
        // Set what action to perform when an item is long-clicked.
    }
});

public class CustomParticipantsListAdapter extends UserTypeListAdapter {
    @NonNull
    @Override
    public BaseViewHolder<User> onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        // Create the custom view holder and return it.
        // Create your custom viewholder or you can call super.onCreateViewHolder() if you want to use the default.
        return new CREATE_YOUR_CUSTOM_VIEWHOLDER();
    }

    @Override
    public void onBindViewHolder(@NonNull BaseViewHolder<User> holder, int position) {
        // When you call the super, the listener implemented through Builder is attached.
        // You can implement your own listener here without calling the super.
        super.onBindViewHolder(holder, position);
        // Bind the custom view holder.
    }
}

public class CustomParticipantViewHolder extends BaseViewHolder<User> {
    public CustomParticipantViewHolder(@NonNull View itemView) {
        super(itemView);
    }

    @Override
    public void bind(User item) {
        // Bind the data to the view holder.
    }
}

builder.setParticipantsListAdapter(new CustomParticipantsListAdapter());

<style name="Custom" parent="SendBird">
    <item name="sb_member_preview_style">@style/custom</item>
</style>

<style name="custom" parent="Widget.SendBird.MemberPreview">
    <item name="android:background"></item>
    <item name="sb_member_preview_nickname_appearance"></item>
    <item name="sb_member_preview_description_appearance"></item>
    <item name="sb_member_preview_action_menu_background"></item>
</style>

new ParticipantsListFragment.Builder(R.style.Custom).build();

Intent intent = OpenChannelSettingsActivity.newIntent(context, CHANNEL_URL);
startActivity(intent);

Intent intent = OpenChannelSettingsActivity.newIntentFromCustomActivity(context, CustomOpenChannelSettingsActivity.class, CHANNEL_URL);
startActivity(intent);

public class OpenChannelSettingsActivity extends AppCompatActivity {
    ...

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.sb_activity);
        OpenChannelSettingsFragment fragment = createOpenChannelSettingsFragment(url);
        // Put the Fragment in the view.
    }

    protected OpenChannelSettingsFragment createOpenChannelSettingsFragment(@NonNull String channelUrl) {
        return new OpenChannelSettingsFragment.Builder(channelUrl)
            .setUseHeader(true)
            .build();
    }
}

OpenChannelSettingsFragment Fragment = new OpenChannelSettingsFragment.Builder(CHANNEL_URL)
    .setCustomOpenChannelSettingsFragment(new CustomOpenChannelSettingsFragment())
    .setUseHeader(true)
    .setHeaderTitle("Settings")
    .setUseHeaderLeftButton(true)
    .setUseHeaderRightButton(true)
    .setHeaderLeftButtonIconResId(R.drawable.icon_arrow_left)
    .setHeaderLeftButtonListener(leftButtonListener)
    .setOnSettingMenuClickListener(clickListener)
    .setLoadingDialogHandler(loadingDialogHandler)
    .build();

<style name="Custom" parent="SendBird">
    <item name="sb_open_channel_settings_style">@style/custom</item>
</style>

<style name="custom" parent="Widget.SendBird.OpenChannel.ChannelSettings">
    <item name="sb_channel_settings_background"></item>
    <item name="sb_channel_settings_item_background"></item>
    <item name="sb_channel_settings_name_appearance"></item>
    <item name="sb_channel_settings_item_appearance"></item>
    <item name="sb_channel_settings_description_appearance"></item>
    <item name="sb_channel_information_title_appearance"></item>
    <item name="sb_channel_information_content_appearance"></item>
</style>

new OpenChannelSettingsFragment.Builder(CHANNEL_URL, R.style.Custom).build();