AlexPrestonSB

package com.sendbird.androidchattutorial;

import android.content.Intent;
import android.support.design.widget.TextInputEditText;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

AlexPrestonSB

<?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">

AlexPrestonSB

<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"

AlexPrestonSB

<?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

AlexPrestonSB

<?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

AlexPrestonSB

        // 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);

AlexPrestonSB

@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);

AlexPrestonSB

  @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);

AlexPrestonSB

// 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);
            }

AlexPrestonSB

// 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;
                    }