How to build an Android chat app using a chat API :: 안드로이드 설치 및 개발[SSISO Community]

Chat tutorial using a chat API

Once the exclusive realm of large tech companies, messaging apps are becoming more ubiquitous because of the rise of chat API. This tutorial will enable you to create a messaging app from scratch, with only a few hundred lines of client-side code, and without the need for a server or even registration.

This guide will be carried out in Android Studio. It uses the SendBird Android SDK, which provides methods to easily send, fetch, and receive messages in real-time. The complete app is on GitHub.

1. Import dependencies

For this tutorial, we will be using the v7 AppCompat, Design Support, Constraint Layout, and Glide libraries, as well as the SendBird Android SDK.

Add these lines to your app-level build.gradle file.

repositories {
  maven { url "https://raw.githubusercontent.com/smilefam/SendBird-SDK-Android/master/" }
}

dependencies {
  compile 'com.android.support:appcompat-v7:25.3.1'
  compile 'com.android.support:design:25.3.1'
  compile 'com.android.support.constraint:constraint-layout:1.0.2'
  
  compile 'com.sendbird.sdk:sendbird-android-sdk:3.0.27'
  compile 'com.github.bumptech.glide:glide:3.7.0'
}

view raw build.gradle hosted with ❤ by GitHub

2. Create a sign-in screen

Screenshot_1498545688

In order to use the SendBird SDK, you must specify a username and nickname. You do not need a separate registration process as unknown usernames automatically create a new user. Your nickname is displayed beside each message you send.

Create an XML file with two TextInputEditTexts and a login button.

activity_login.xml

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginLeft="16dp"
    android:layout_marginRight="16dp"
    tools:context="com.sendbird.androidchattutorial.LoginActivity">

    <android.support.design.widget.TextInputLayout
        android:id="@+id/text_input_login_user_id"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="User ID"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/text_input_login_user_nickname"
        android:layout_marginBottom="16dp">

    <android.support.design.widget.TextInputEditText
        android:id="@+id/edit_text_login_user_id"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionNext"/>

    </android.support.design.widget.TextInputLayout>

    <android.support.design.widget.TextInputLayout
        android:id="@id/text_input_login_user_nickname"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toBottomOf="@id/text_input_login_user_id"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/button_login"
        android:hint="User Nickname"
        android:layout_marginBottom="16dp">

    <android.support.design.widget.TextInputEditText
        android:id="@+id/edit_text_login_user_nickname"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:imeOptions="actionDone"/>

    </android.support.design.widget.TextInputLayout>

    <Button
        android:id="@id/button_login"
        android:text="Log in"
        android:layout_width="0dp"
        android:layout_height="56dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/text_input_login_user_nickname"
        app:layout_constraintVertical_chainStyle="packed"/>

</android.support.constraint.ConstraintLayout>

view raw activity_login.xml hosted with ❤ by GitHub

When the button is pressed, we will use these fields to log in to the SendBird servers. First, initialize the SDK by calling SendBird.init(), passing in the APP ID provided in the code below. Then, connect with SendBird.connect() and update the user’s nickname with SendBird.updateCurrentUserInfo().

LoginActivity.java

public class LoginActivity extends AppCompatActivity {
    // Sample APP ID provided by SendBird
    private static final String APP_ID = "9DA1B1F4-0BE6-4DA8-82C5-2E81DAB56F23";

    private Button mConnectButton;
    private TextInputEditText mUserIdEditText, mUserNicknameEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);

        mConnectButton = (Button) findViewById(R.id.button_login);
        mUserIdEditText = (TextInputEditText) findViewById(R.id.edit_text_login_user_id);
        mUserNicknameEditText = (TextInputEditText) findViewById(R.id.edit_text_login_user_nickname);

        // Initialize the SendBird SDK.
        SendBird.init(APP_ID, this.getApplicationContext());

        mConnectButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String userId = mUserIdEditText.getText().toString();
                // Remove all spaces from userID
                userId = userId.replaceAll("\\s", "");

                String userNickname = mUserNicknameEditText.getText().toString();

                connectToSendBird(userId, userNickname);
              }
        });
    }

    /**
    * Attempts to connect a user to SendBird.
    * @param userId The unique ID of the user.
    * @param userNickname The user's nickname, which will be displayed in chats.
    */
    private void connectToSendBird(final String userId, final String userNickname) {
        mConnectButton.setEnabled(false);

        SendBird.connect(userId, new SendBird.ConnectHandler() {
            @Override
            public void onConnected(User user, SendBirdException e) {

                if (e != null) {
                    // Error!
                    Toast.makeText(
                    LoginActivity.this, "" + e.getCode() + ": " + e.getMessage(),
                    Toast.LENGTH_SHORT)
                    .show();

                    // Show login failure snackbar
                    mConnectButton.setEnabled(true);
                    return;
                }

                // Update the user's nickname
                updateCurrentUserInfo(userNickname);

                Intent intent = new Intent(LoginActivity.this, ChatActivity.class);
                startActivity(intent);
                finish();
            }
        });
    }

    /**
    * Updates the user's nickname.
    * @param userNickname The new nickname of the user.
    */
    private void updateCurrentUserInfo(String userNickname) {
        SendBird.updateCurrentUserInfo(userNickname, null, new SendBird.UserInfoUpdateHandler() {
            @Override
            public void onUpdated(SendBirdException e) {
                if (e != null) {
                    // Error!
                    Toast.makeText(
                    LoginActivity.this, "" + e.getCode() + ":" + e.getMessage(),
                    Toast.LENGTH_SHORT)
                    .show();

                    return;
                }

            }
        });
    }

}

view raw LoginActivity.java hosted with ❤ by GitHub

3. Implement a messaging UI

Next, we will create a new Activity called ChatActivity. This will be the main screen, and contain chat bubbles as well as a chatbox where you can type and send messages. Create the activity as well as a corresponding XML file, activity_chat.xml.

We will have to implement several XML files for the layout. This part is covered in depth in another blog post, Building a messaging UI - reference the link for more detailed descriptions. To summarize, you need three layouts: (1) the main screen with a chatbox and a RecyclerView to display messages, (2) a layout for received messages, and (3) a layout for sent messages. A vertical RecyclerView will be the container for a list of messages. Each message will be encased in a colored background drawable, making a chat bubble.

(1) activity_chat.xml

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
  
    <android.support.v7.widget.RecyclerView
        android:id="@+id/reycler_chat"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:paddingBottom="4dp"
        android:clipToPadding="false"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toTopOf="@+id/divider_chat"
        android:scrollbars="vertical">
  
    </android.support.v7.widget.RecyclerView>

    <!-- A horizontal line between the chatbox and RecyclerView -->
    <View
        android:id="@id/divider_chat"
        android:layout_width="0dp"
        android:layout_height="2dp"
        android:background="#dfdfdf"
        android:layout_marginBottom="0dp"
        app:layout_constraintBottom_toTopOf="@+id/layout_chat_chatbox"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>

    <LinearLayout
        android:id="@+id/layout_chat_chatbox"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:minHeight="48dp"
        android:background="#ffffff"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toLeftOf="parent">

    <EditText
        android:id="@+id/edittext_chat"
        android:hint="Enter message"
        android:background="@android:color/transparent"
        android:layout_gravity="center"
        android:layout_marginLeft="16dp"
        android:layout_marginRight="16dp"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:maxLines="6"/>

    <Button
        android:id="@+id/button_chat_send"
        android:text="SEND"
        android:textSize="14dp"
        android:background="?attr/selectableItemBackground"
        android:clickable="true"
        android:layout_width="64dp"
        android:layout_height="48dp"
        android:gravity="center"
        android:layout_gravity="bottom" />
        </LinearLayout>

</android.support.constraint.ConstraintLayout>

view raw activity_chat.xml hosted with ❤ by GitHub

(2) item_message_sent.xml

Screen Shot 2017-06-27 at 4.11.11 PM

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="8dp">
  
    <TextView
        android:id="@+id/text_message_body"
        android:text="hello, hello!"
        android:background="@drawable/rounded_rectangle_blue"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxWidth="272dp"
        android:paddingLeft="12dp"
        android:paddingRight="12dp"
        android:paddingTop="6dp"
        android:paddingBottom="6dp"
        android:textSize="16sp"
        android:textColor="#ffffff"
        android:layout_marginRight="8dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/text_message_time"
        android:text="11:40"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10sp"
        android:layout_marginRight="4dp"
        app:layout_constraintBottom_toBottomOf="@+id/text_message_body"
        app:layout_constraintRight_toLeftOf="@+id/text_message_body" />

</android.support.constraint.ConstraintLayout>

view raw item_message_sent.xml hosted with ❤ by GitHub

(3) item_message_received.xml

Screen Shot 2017-06-27 at 4.10.53 PM

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:paddingTop="8dp">
  
    <ImageView
        android:id="@+id/image_message_profile"
        android:layout_width="32dp"
        android:layout_height="32dp"
        android:background="@drawable/circle"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginLeft="8dp"
        app:layout_constraintLeft_toLeftOf="parent" />

    <TextView
        android:id="@+id/text_message_name"
        android:text="John Doe"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="14sp"
        app:layout_constraintLeft_toRightOf="@+id/image_message_profile"
        android:layout_marginLeft="8dp"
        app:layout_constraintTop_toTopOf="parent"
        android:layout_marginTop="4dp" />

    <TextView
        android:id="@+id/text_message_body"
        android:text="hi man, how are you?"
        android:background="@drawable/rounded_rectangle_gray"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:maxWidth="240dp"
        android:paddingLeft="12dp"
        android:paddingRight="12dp"
        android:paddingTop="6dp"
        android:paddingBottom="6dp"
        android:textSize="16sp"
        android:textColor="#000000"
        android:layout_marginTop="4dp"
        app:layout_constraintTop_toBottomOf="@+id/text_message_name"
        app:layout_constraintLeft_toRightOf="@+id/image_message_profile"
        android:layout_marginLeft="8dp" />

    <TextView
        android:id="@+id/text_message_time"
        android:text="11:40"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="10sp"
        app:layout_constraintLeft_toRightOf="@+id/text_message_body"
        android:layout_marginLeft="4dp"
        app:layout_constraintBottom_toBottomOf="@+id/text_message_body" />

</android.support.constraint.ConstraintLayout>

view raw item_message_received.xml hosted with ❤ by GitHub

4. Create an Adapter for the RecyclerView

To bind these XML components to actual data, we must create an Adapter for the RecyclerView. First, create a nested class within ChatActivity called ChatAdapter, which should subclass RecyclerView.Adapter. This adapter will hold two types of ViewHolders: one for received messages, and one for sent messages. Utils here is a convenience class that contains methods for formatting timestamps into readable formats and rendering images from URLs. You can view the whole code here. Create two classes nested within ChatAdapter.

ChatActivity.java

// Messages sent by me do not display a profile image or nickname.
        private class SentMessageHolder extends RecyclerView.ViewHolder {
            TextView messageText, timeText;

            SentMessageHolder(View itemView) {
                super(itemView);

                messageText = (TextView) itemView.findViewById(R.id.text_message_body);
                timeText = (TextView) itemView.findViewById(R.id.text_message_time);
            }

            void bind(UserMessage message) {
                messageText.setText(message.getMessage());

                // Format the stored timestamp into a readable String using method.
                timeText.setText(Utils.formatTime(message.getCreatedAt()));
            }
        }

        // Messages sent by others display a profile image and nickname.
        private class ReceivedMessageHolder extends RecyclerView.ViewHolder {
            TextView messageText, timeText, nameText;
            ImageView profileImage;

            ReceivedMessageHolder(View itemView) {
                super(itemView);

                messageText = (TextView) itemView.findViewById(R.id.text_message_body);
                timeText = (TextView) itemView.findViewById(R.id.text_message_time);
                nameText = (TextView) itemView.findViewById(R.id.text_message_name);
                profileImage = (ImageView) itemView.findViewById(R.id.image_message_profile);
            }

            void bind(UserMessage message) {
                messageText.setText(message.getMessage());
                nameText.setText(message.getSender().getNickname());
                Utils.displayRoundImageFromUrl(ChatActivity.this,
                        message.getSender().getProfileUrl(), profileImage);
                timeText.setText(Utils.formatTime(message.getCreatedAt()));

            }
        }


    }
}

view raw sentMessageHolder-snippet.java hosted with ❤ by GitHub

Next, we will implement methods within the adapter to fetch messages from the server and store them in an ArrayList.

 // Retrieves 30 most recent messages.
        void refresh() {
            mChannel.getPreviousMessagesByTimestamp(Long.MAX_VALUE, true, 30, true,
                    BaseChannel.MessageTypeFilter.USER, null, new BaseChannel.GetMessagesHandler() {
                @Override
                public void onResult(List<BaseMessage> list, SendBirdException e) {
                    if (e != null) {
                        e.printStackTrace();
                        return;
                    }
                    mMessageList = (ArrayList<BaseMessage>) list;

                    notifyDataSetChanged();

                }
            });

        }

        void loadPreviousMessages() {
            final long lastTimestamp = mMessageList.get(mMessageList.size() - 1).getCreatedAt();
            mChannel.getPreviousMessagesByTimestamp(lastTimestamp, false, 30, true,
                    BaseChannel.MessageTypeFilter.USER, null, new BaseChannel.GetMessagesHandler() {
                @Override
                public void onResult(List<BaseMessage> list, SendBirdException e) {
                    if (e != null) {
                        e.printStackTrace();
                        return;
                    }
                    mMessageList.addAll(list);

                    notifyDataSetChanged();
                }
            });
        }

        // Appends a new message to the beginning of the message list.
        void appendMessage(UserMessage message) {
            mMessageList.add(0, message);
            notifyDataSetChanged();
        }

        // Sends a new message, and appends the sent message to the beginning of the message list.
        void sendMessage(final String message) {
            mChannel.sendUserMessage(message, new BaseChannel.SendUserMessageHandler() {
                @Override
                public void onSent(UserMessage userMessage, SendBirdException e) {
                    if (e != null) {
                        e.printStackTrace();
                        return;
                    }

                    mMessageList.add(0, userMessage);
                    notifyDataSetChanged();
                }
            });
        }

view raw refreshMessage-snippet.java hosted with ❤ by GitHub

Finally, we will override classes in RecyclerView.Adapter to bind the XML files we wrote earlier to each of our fetched messages.

        // Determines the appropriate ViewType according to the sender of the message.
        @Override
        public int getItemViewType(int position) {
            UserMessage message = (UserMessage) mMessageList.get(position);

            if (message.getSender().getUserId().equals(SendBird.getCurrentUser().getUserId())) {
                // If the current user is the sender of the message
                return VIEW_TYPE_MESSAGE_SENT;
            } else {
                // If some other user sent the message
                return VIEW_TYPE_MESSAGE_RECEIVED;
            }
        }

        // Inflates the appropriate layout according to the ViewType.
        @Override
        public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
            View view;

            if (viewType == VIEW_TYPE_MESSAGE_SENT) {
                view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_message_sent, parent, false);
                return new SentMessageHolder(view);
            } else if (viewType == VIEW_TYPE_MESSAGE_RECEIVED) {
                view = LayoutInflater.from(parent.getContext())
                        .inflate(R.layout.item_message_received, parent, false);
                return new ReceivedMessageHolder(view);
            }

            return null;
        }

        // Passes the message object to a ViewHolder so that the contents can be bound to UI.
        @Override
        public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
            UserMessage message = (UserMessage) mMessageList.get(position);

            switch (holder.getItemViewType()) {
                case VIEW_TYPE_MESSAGE_SENT:
                    ((SentMessageHolder) holder).bind(message);
                    break;
                case VIEW_TYPE_MESSAGE_RECEIVED:
                    ((ReceivedMessageHolder) holder).bind(message);
            }
        }

        @Override
        public int getItemCount() {
            return mMessageList.size();
        }

view raw getItemViewType-snippet.java hosted with ❤ by GitHub

View the full code for ChatAdapter here.

5. Initialize the RecyclerView with ChatAdapter

Using the SendBird methods OpenChannel.getChannel() and channel.enter(), we will enter a channel where we can talk to others. Unlike a ListView, a RecyclerView requires a LayoutManager in order to initialize. mLayoutManager.reverse() sets the first item at the bottom of the RecyclerView so that the newest messages are shown first when the Activity is opened.

public class ChatActivity extends AppCompatActivity {
    private final String mChannelUrl = "sendbird_open_channel_tutorial";
    private final static String CHANNEL_HANDLER_ID = "CHANNEL_HANDLER_CHAT";

    private ChatAdapter mChatAdapter;
    private RecyclerView mRecyclerView;
    private LinearLayoutManager mLayoutManager;
    private Button mSendButton;
    private EditText mMessageEditText;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chat);

        mSendButton = (Button) findViewById(R.id.button_chat_send);
        mMessageEditText = (EditText) findViewById(R.id.edittext_chat);

        mRecyclerView = (RecyclerView) findViewById(R.id.reycler_chat);
        mLayoutManager = new LinearLayoutManager(this);
        mLayoutManager.setReverseLayout(true);
        mRecyclerView.setLayoutManager(mLayoutManager);

        OpenChannel.getChannel(mChannelUrl, new OpenChannel.OpenChannelGetHandler() {
            @Override
            public void onResult(final OpenChannel openChannel, SendBirdException e) {
                if (e != null) {
                    e.printStackTrace();
                    return;
                }

                openChannel.enter(new OpenChannel.OpenChannelEnterHandler() {
                    @Override
                    public void onResult(SendBirdException e) {
                        if (e != null) {
                            e.printStackTrace();
                            return;
                        };

                        mChatAdapter = new ChatAdapter(openChannel);
                        mRecyclerView.setAdapter(mChatAdapter);
                    }
                });
            }
        });

        mSendButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                mChatAdapter.sendMessage(mMessageEditText.getText().toString());
                mMessageEditText.setText("");
            }
        });

        mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                if (mLayoutManager.findLastVisibleItemPosition() == mChatAdapter.getItemCount() - 1) {
                    mChatAdapter.loadPreviousMessages();
                }
            }
        });

    }

view raw ChatActivity-snippet.java hosted with ❤ by GitHub

6. Register a Channel Handler in ChatActivity

The last step is to register a Channel Handler, which automatically receives all incoming messages from the SendBird servers. When the onMessageReceived callback is called, invoke adapter.appendMessage() to display a new message at the bottom of the RecyclerView.

@Override
    protected void onResume() {
        super.onResume();

        // Receives messages from SendBird servers
        SendBird.addChannelHandler(CHANNEL_HANDLER_ID, new SendBird.ChannelHandler() {
            @Override
            public void onMessageReceived(BaseChannel baseChannel, BaseMessage baseMessage) {
                if (baseChannel.getUrl().equals(mChannelUrl) && baseMessage instanceof UserMessage) {
                    mChatAdapter.appendMessage((UserMessage) baseMessage);
                }
            }
        });
    }

    @Override
    protected void onPause() {
        SendBird.removeChannelHandler(CHANNEL_HANDLER_ID);

        super.onPause();
    }

view raw onResume-snippet.java hosted with ❤ by GitHub

And that's it! Run the app on two devices (maybe one emulator and one actual device), log in with different usernames, and start chatting! You should see messages arriving on each device nearly instantly. If you are unsure about certain parts, reference the full source code available on GitHub.

If you want to take this app a step further, try out SendBird's open-source sample Android app. Constructed using the logic covered in this tutorial, it enables advanced features such as sending images, animated GIFs, and files. It also displays typing indicators, user lists, and much more, and should be a very useful reference for anyone planning to release a production chat app.

Read our API documentation

Alex

‎2018‎년 ‎4‎월 ‎9‎일‎ ‎오후‎ ‎11‎:‎14‎:‎15

Hi Terry,
just found your article - is there a way to add only default chat messages, so no free text entry but rather a choice of premade sentences/phots?
I want to create an app whre you can just communicate through a set of pictures.

Thanks a lot
Alex

chidinma

‎2018‎년 ‎4‎월 ‎13‎일‎ ‎오전‎ ‎2‎:‎39‎:‎45

the "mChannelUrl" what should it contain?

jghj yjjyhg

‎2018‎년 ‎4‎월 ‎29‎일‎ ‎오전‎ ‎3‎:‎55‎:‎50

yjyher;'yg

Evan

‎2018‎년 ‎5‎월 ‎1‎일‎ ‎오전‎ ‎3‎:‎18‎:‎38

Blogs involving code should be formatted in readable manners, this looks like a middle schooler's draft, it's really all over the place.

Alek

‎2018‎년 ‎7‎월 ‎17‎일‎ ‎오전‎ ‎9‎:‎42‎:‎08

Hi Evan, you're right that code should absolutely be readable. When we migrated our blog, many of our code snippets were unformatted.

I reposted now using gists from Github. Hope this helps!

Adnan Javed

‎2018‎년 ‎6‎월 ‎27‎일‎ ‎오전‎ ‎12‎:‎47‎:‎21

Hello respected Sendbird,

I'm facing following Issues:

1. In order to create a group channel. As list of users required to create a group channel so when a ask sendbird to return a list of all users using createUserListQuery(), it does not call/invoke the next method i.e

userListQuery = SendBird.createUserListQuery();
userListQuery.setLimit(numberOfUsers);
userListQuery.next(new UserListQuery.UserListQueryResultHandler() {
@Override
public void onResult(List list, SendBirdException e) {
if (e != null){
Log.e("Error#", e.getCode()+": "+e.getMessage());
return;
}

adapter.setUserList(list);
}
});

so because of that list (users) is not being passed to adapter and adapter is throwing an error i.e
"Attempt to invoke interface method 'int java.util.List.size()' on a null object reference"
while an application is connected to sendbird.

2. In case of OpenChannel, messages are sent and received. The problem is sendBird not returning a NickName when i call the following peice of code to inflate a message in RecyclerView while a message is being returned just:

void Bind(Context context, UserMessage message){

date.setText(DateUtils.formatDate(message.getCreatedAt())); // ok

nickName.setText( message.getSender().getNickname()); // nothing why ?

messageBody.setText(message.getMessage()); // ok

}

So what is the problem?? I have spent many days resolving these error but unable to resolve !