本篇僅介紹實現聊天室的前端,也就是安卓端代碼,後端的實現看鏈接說明
鏈接說明
1.後端使用了spring boot 框架,若不熟悉,有關spring boot 入門教程請戳此鏈接使用Intellij IDEA開發第一個spring boot項目
2.websocket後端實現細節戳此鏈接spring boot練習–利用websocket實現QQ聊天室
界面展示
說明
有兩個界面,第一個是登陸界面,我借用了我之前實現的登陸界面,並做了一些微調。需要輸入ID和名字,測試的時候輸入的ID不能重複,第二個是名字用於界面展示,登陸後跳轉入第二個界面,就可以在聊天室裏聊天了。
下面圖模擬了一組場景,大青兒先進入聊天室,然後小明進入,互相發一段消息後,小明退出聊天室。
大青兒界面變化
小明界面變化
代碼部分
這裏僅展示安卓的代碼,後端代碼詳見上面鏈接說明。
文件的簡單介紹
Activity文件:LoginActivity.java,ChatActivity.java,與其對應佈局文件activity_login.xml,activity_chat.xml
模型文件:Msg.java,User.java
適配器:UserAdapter
子佈局文件:user_item.xml
第一步修改.gradle文件,添加以下內容
implementation 'com.squareup.okhttp3:okhttp:3.8.1'
implementation 'com.squareup.okhttp3:mockwebserver:3.8.1'
implementation 'com.alibaba:fastjson:1.2.10'
implementation 'com.android.support:recyclerview-v7:28.0.0'
第二步,修改AndroidManifest.xml文件,添加以下內容
<activity android:name=".ChatActivity">
</activity>
<activity android:name=".LoginActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
以及添加這行,注意添加的位置的區別
<uses-permission android:name="android.permission.INTERNET" />
第三步具體功能代碼
LoginActivity.java
public class LoginActivity extends Activity {
private EditText mEditTextName,mEditTextId;
private Button mButtonLogin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
init();
mButtonLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String userName = mEditTextName.getText().toString();
String userId = mEditTextId.getText().toString();
User user = new User(userId,userName);
Intent intent = ChatActivity.newIntent(LoginActivity.this,user.toString());
startActivity(intent);
LoginActivity.this.finish();
}
});
}
private void init(){
mEditTextName = findViewById(R.id.nickname_editText);
mEditTextId = findViewById(R.id.id_editText);
mEditTextName.setCompoundDrawables(initDrawable(R.drawable.nickname),null,null,null);
mEditTextId.setCompoundDrawables(initDrawable(R.drawable.id),null,null,null);
mButtonLogin = findViewById(R.id.login);
}
/**
* 設置EditText左邊圖片的大小
* */
private Drawable initDrawable(int res){
Drawable drawable = getResources().getDrawable(res);
//距離左邊距離,距離上邊距離,長,寬
drawable.setBounds(0,0,100,100);
return drawable;
}
}
activity_login.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/background">
<!-- https://www.runoob.com/w3cnote/android-tutorial-relativelayout.html-->
<RelativeLayout
android:id="@+id/viewTop"
android:layout_width="match_parent"
android:layout_height="240dp"
android:background="@color/mihuang">
<ImageView
android:layout_width="90dp"
android:layout_height="90dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="10dp"
android:src="@drawable/boy" />
</RelativeLayout>
<RelativeLayout
android:id="@+id/viewCenter"
android:paddingTop="20dp"
android:layout_centerHorizontal="true"
android:layout_width="280dp"
android:layout_height="wrap_content"
android:layout_below="@+id/viewTop"
android:paddingBottom="70dp">
<EditText
android:id="@+id/id_editText"
android:layout_width="match_parent"
android:layout_height="60dp"
android:drawablePadding="10dp"
android:drawableLeft="@drawable/id"
android:hint="請輸入Id"
android:textSize="16sp"
android:layout_marginLeft="10dp"/>
<ImageView
android:layout_width="40dp"
android:layout_height="40dp"
android:layout_alignParentRight="true"
android:src="@drawable/down"
android:paddingRight="10dp"
android:paddingTop="20dp"/>
<EditText
android:layout_below="@+id/id_editText"
android:id="@+id/nickname_editText"
android:layout_width="match_parent"
android:layout_height="60dp"
android:drawablePadding="10dp"
android:drawableLeft="@drawable/nickname"
android:hint="請輸入暱稱"
android:layout_marginLeft="10dp"
android:textSize="16sp"/>
</RelativeLayout>
<Button
android:layout_below="@+id/viewCenter"
android:layout_centerHorizontal="true"
android:id="@+id/login"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:text="登陸"
android:textColor="@color/text"
android:background="@color/login"
android:textSize="25dp" />
<RelativeLayout
android:layout_alignParentBottom="true"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="10dp">
<TextView
android:text="無法登陸?"
android:paddingLeft="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
<TextView
android:text="新用戶註冊"
android:paddingRight="10dp"
android:layout_alignParentRight="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
</RelativeLayout>
</RelativeLayout>
ChatActivity.java
public class ChatActivity extends Activity {
private ArrayList<User> mUserArrayList = new ArrayList<>();//定義一個存儲信息的列表
private EditText mInputText;//輸入框
private Button mSend;//發送按鈕
private RecyclerView mRecyclerView;//滑動框
private UserAdapter mAdapter;//適配器
private boolean backFlag = false;
private WebSocket mSocket;
private User mUser;;//全局User
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
initView();
String data = getIntent().getStringExtra("data");
if (!data.equals("")){
mUser = JSON.parseObject(data,User.class);
}else {
mUser = new User("0001","測試名字",R.drawable.boy);
}
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(layoutManager);
mAdapter = new UserAdapter(mUserArrayList);
mRecyclerView.setAdapter(mAdapter);
//開啓連接
start(mUser.getUserId());
mSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String content = mInputText.getText().toString();
if (!"".equals(content)) {
Msg msg = new Msg(true,content,false);
User tempUser = new User(mUser.getUserId(),mUser.getUserName(),R.drawable.boy,msg);
mSocket.send(tempUser.toString());
mUserArrayList.add(tempUser);
updateRecyclerView();//刷新RecyclerView
//清空輸入欄
mInputText.setText("");
}
}
});
}
/**
* 刷新view
* */
private void updateRecyclerView(){
//當有新消息時,刷新RecyclerView中的顯示
mAdapter.notifyItemInserted(mUserArrayList.size() - 1);
//將RecyclerView定位到最後一行
mRecyclerView.scrollToPosition(mUserArrayList.size() - 1);
}
/**
* 開啓web socket連接
* */
private void start(String userId) {
OkHttpClient mOkHttpClient = new OkHttpClient.Builder()
.readTimeout(300, TimeUnit.SECONDS)//設置讀取超時時間
.writeTimeout(300, TimeUnit.SECONDS)//設置寫的超時時間
.connectTimeout(300, TimeUnit.SECONDS)//設置連接超時時間
.build();
//定義request
Request request = new Request.Builder().url("ws://192.168.5.10:8080/test/"+userId).build();
//綁定回調接口
mOkHttpClient.newWebSocket(request, new EchoWebSocketListener());
mOkHttpClient.dispatcher().executorService().shutdown();
}
/**
* 顯示內容
* */
private void output(final User user) {
runOnUiThread(new Runnable() {
@Override
public void run() {
mUserArrayList.add(user);
updateRecyclerView();
}
});
}
/**
* 初始化界面
* */
private void initView(){
mInputText = findViewById(R.id.input_text);
mSend = findViewById(R.id.send);
mRecyclerView = findViewById(R.id.msg_recycler_view);
}
/**
* 靜態方法返回一個能啓動自己的intent
* */
public static Intent newIntent(Context context,String data){
Intent intent = new Intent(context,ChatActivity.class);
intent.putExtra("data",data);
return intent;
}
/**
* 對返回鍵的處理
* */
@Override
public boolean onKeyDown(int keyCode, KeyEvent event){
if(keyCode==KeyEvent.KEYCODE_BACK&&!backFlag){
Toast.makeText(ChatActivity.this,"再按一次退出程序",Toast.LENGTH_SHORT).show();
backFlag = true;
return true;
}else {
return super.onKeyDown(keyCode, event);
}
}
/**
* 內部類,監聽web socket回調
* */
private final class EchoWebSocketListener extends WebSocketListener {
@Override
public void onOpen(WebSocket webSocket, Response response) {
super.onOpen(webSocket, response);
mSocket = webSocket; //實例化web socket
User user = new User();
user.setUserMsg(new Msg(false,"連接成功",true));
output(user);
}
@Override
public void onMessage(WebSocket webSocket, String text) {
super.onMessage(webSocket, text);
User user = JSON.parseObject(text, User.class);
output(user);
}
@Override
public void onClosed(WebSocket webSocket, int code, String reason) {
super.onClosed(webSocket, code, reason);
User user = new User();
user.setUserMsg(new Msg(false,"關閉連接",true));
output(user);
}
@Override
public void onFailure(WebSocket webSocket, Throwable t, Response response) {
super.onFailure(webSocket, t, response);
User user = new User();
user.setUserMsg(new Msg(false,"連接失敗:"+t.getMessage(),true));
output(user);
}
}
}
activity_chat.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#d8e0e8">
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/msg_recycler_view"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<EditText
android:id="@+id/input_text"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:maxLines="2"
android:hint="請輸入……"
/>
<Button
android:id="@+id/send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="發送"/>
</LinearLayout>
</LinearLayout>
Msg.java
public class Msg {
private boolean send;//是否是發送的消息
private String content;//發送的內容
private boolean system;//是否是系統消息
public Msg(boolean send, String content) {
this.send = send;
this.content = content;
this.system = false;
}
public Msg() {
}
public Msg(boolean send, String content, boolean system) {
this.send = send;
this.content = content;
this.system = system;
}
public boolean isSystem() {
return system;
}
public void setSystem(boolean system) {
this.system = system;
}
public boolean isSend() {
return send;
}
public void setSend(boolean send) {
this.send = send;
}
public String getContent() {
return content;
}
public void setContent(String content) {
this.content = content;
}
@Override
public String toString() {
return JSON.toJSONString(this);
}
}
User.java
public class User {
private String userId;
private String userName;
private int userImg;
private Msg userMsg;
public int getUserImg() {
return userImg;
}
public void setUserImg(int userImg) {
this.userImg = userImg;
}
public User(String userId, String userName, int userImg) {
this.userId = userId;
this.userName = userName;
this.userImg = userImg;
}
public User() {
}
public User(String userId, String userName) {
this.userId = userId;
this.userName = userName;
}
public User(String userId, String userName, Msg userMsg) {
this.userId = userId;
this.userName = userName;
this.userMsg = userMsg;
}
public User(String userId, String userName, int userImg, Msg userMsg) {
this.userId = userId;
this.userName = userName;
this.userImg = userImg;
this.userMsg = userMsg;
}
public String getUserId() {
return userId;
}
public void setUserId(String userId) {
this.userId = userId;
}
public String getUserName() {
return userName;
}
public void setUserName(String userName) {
this.userName = userName;
}
public Msg getUserMsg() {
return userMsg;
}
public void setUserMsg(Msg userMsg) {
this.userMsg = userMsg;
}
@Override
public String toString() {
return JSON.toJSONString(this);
}
}
UserAdapter.java
public class UserAdapter extends RecyclerView.Adapter<UserAdapter.ViewHolder>{
private ArrayList<User> mUsers;
public UserAdapter(ArrayList<User> users) {
mUsers = users;
}
@NonNull
@Override
public UserAdapter.ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.user_item,parent,false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull UserAdapter.ViewHolder holder, int position) {
User user = mUsers.get(position);
if (user.getUserMsg().isSystem()){//系統消息
holder.mLinearLayoutSystem.setVisibility(View.VISIBLE);
holder.mRelativeLayoutReceive.setVisibility(View.GONE);
holder.mRelativeLayoutSend.setVisibility(View.GONE);
holder.mTextViewSystemText.setText(user.getUserMsg().getContent());
}else{
if (user.getUserMsg().isSend()){//是發送消息
holder.mLinearLayoutSystem.setVisibility(View.GONE);
holder.mRelativeLayoutReceive.setVisibility(View.GONE);
holder.mRelativeLayoutSend.setVisibility(View.VISIBLE);
holder.mImageViewSend.setImageResource(user.getUserImg());
holder.mTextViewNameSend.setText(user.getUserName());
holder.mTextViewContentSend.setText(user.getUserMsg().getContent());
}else { //接收的消息
holder.mLinearLayoutSystem.setVisibility(View.GONE);
holder.mRelativeLayoutReceive.setVisibility(View.VISIBLE);
holder.mRelativeLayoutSend.setVisibility(View.GONE);
holder.mImageViewReceive.setImageResource(user.getUserImg());
holder.mTextViewNameReceive.setText(user.getUserName());
holder.mTextViewContentReceive.setText(user.getUserMsg().getContent());
}
}
}
@Override
public int getItemCount() {
return mUsers.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
//綁定所有視圖
RelativeLayout mRelativeLayoutSend,mRelativeLayoutReceive;
LinearLayout mLinearLayoutSystem;
ImageView mImageViewReceive,mImageViewSend;
TextView mTextViewNameReceive,mTextViewNameSend,mTextViewContentReceive,mTextViewContentSend,mTextViewSystemText;
public ViewHolder(@NonNull View itemView) {
super(itemView);
mRelativeLayoutReceive = itemView.findViewById(R.id.receive_relative);
mRelativeLayoutSend = itemView.findViewById(R.id.send_relative);
mLinearLayoutSystem = itemView.findViewById(R.id.system_layout);
mImageViewReceive = itemView.findViewById(R.id.image_receive);
mImageViewSend = itemView.findViewById(R.id.image_send);
mTextViewNameReceive = itemView.findViewById(R.id.text_name_receive);
mTextViewNameSend = itemView.findViewById(R.id.text_name_send);
mTextViewContentReceive = itemView.findViewById(R.id.text_content_receive);
mTextViewContentSend = itemView.findViewById(R.id.text_content_send);
mTextViewSystemText = itemView.findViewById(R.id.system_text);
}
}
}
user_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:layout_marginBottom="10dp">
<RelativeLayout
android:id="@+id/receive_relative"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_alignParentLeft="true"
android:id="@+id/image_receive"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginTop="20dp"
android:layout_marginLeft="10dp"
android:src="@drawable/boy"/>
<LinearLayout
android:layout_toRightOf="@id/image_receive"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/text_name_receive"
android:layout_width="50dp"
android:layout_height="20dp"
android:layout_gravity="left"
android:text="大青兒"
android:textSize="15dp"
android:textColor="#131313"
android:layout_marginLeft="20dp"/>
<LinearLayout
android:id="@+id/layout_content_receive"
android:layout_gravity="right"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="@drawable/message_left">
<TextView
android:id="@+id/text_content_receive"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
android:textSize="20dp"
android:textColor="#F5EFEF"
android:text="我是一段文字一段文"
/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
<RelativeLayout
android:id="@+id/send_relative"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<ImageView
android:layout_alignParentRight="true"
android:id="@+id/image_send"
android:layout_width="60dp"
android:layout_height="60dp"
android:layout_marginTop="20dp"
android:layout_marginRight="10dp"
android:src="@drawable/boy"/>
<LinearLayout
android:layout_toLeftOf="@id/image_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/text_name_send"
android:layout_width="50dp"
android:layout_height="20dp"
android:layout_gravity="right"
android:text="大青兒"
android:textSize="15dp"
android:textColor="#131313"
android:layout_marginRight="20dp"/>
<LinearLayout
android:id="@+id/layout_content_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:background="@drawable/message_right">
<TextView
android:id="@+id/text_content_send"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="5dp"
android:text="我是一段文字一段文"
android:textSize="20dp" />
</LinearLayout>
</LinearLayout>
</RelativeLayout>
<LinearLayout
android:id="@+id/system_layout"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/system_text"
android:layout_width="wrap_content"
android:layout_height="20dp"
android:text="系統消息:"
android:layout_gravity="center"
android:textColor="#F17070"/>
</LinearLayout>
</RelativeLayout>
圖片資源
應用中大部分圖片資源都是隻起裝飾性作用,可以在阿里巴巴矢量圖標庫獲取,當然包裹聊天文字的圖片是.9格式圖片,可以參考:Android Studio製作.9圖片
提醒一哈
先配置好後端再進行前端測試,不然沒連上服務器會報錯並閃退。因爲當你點發送的時候,有一段代碼中websocket並沒有被實例化。