Android聊天室代码分析

其他 2021-03-24 17:45:15 阅读次数: 0
用Android写的客户端，java写的服务端，这里简单的介绍一下我的客户端
服务端链接
源码链接

效果展示

在这里插入图片描述

在这里插入图片描述

代码展示分析

1.添加权限，依赖库
权限 uses-permission android:name=“android.permission.INTERNET”
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.uichat">

    <uses-permission android:name="android.permission.INTERNET" />

    <application
       ...
    </application>

</manifest>
依赖库
dependencies {
    
    
    implementation fileTree(dir: "libs", include: ["*.jar"])
    ...
    implementation 'androidx.recyclerview:recyclerview:1.2.0-alpha05'	//recyclerview
    implementation 'org.litepal.guolindev:core:3.1.1'		//LitePal
}
1.主页面
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout	//约束布局
    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:background="@drawable/ddd"
    tools:context=".MainActivity">
    <androidx.constraintlayout.widget.Guideline		//虚拟线，用于对下面布局进行约束
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.45" />
    <TextView
        android:id="@+id/username"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="用户名"
        android:textSize="24sp"
        app:layout_constraintEnd_toStartOf="@id/guideline"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toTopOf="@id/login"
        app:layout_constraintVertical_chainStyle="packed"
        app:layout_constraintVertical_bias="0.4"
        android:layout_marginEnd="5dp"
        android:layout_marginRight="5dp" />

    <EditText
        android:id="@+id/usernameEdit"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="18sp"
        android:hint="输入用户名"
        app:layout_constraintBaseline_toBaselineOf="@id/username"
        app:layout_constraintStart_toEndOf="@id/guideline"/>

    <Button
        android:id="@+id/login"
        android:text="登录"
        android:textSize="18sp"
        android:layout_marginTop="10dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        app:layout_constraintTop_toBottomOf="@id/username"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        />


</androidx.constraintlayout.widget.ConstraintLayout>
MainActivity
package com.example.uichat;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity implements View.OnClickListener{
    
    
    Button login;
    EditText loginedittext;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        login = (Button)findViewById(R.id.login);
        loginedittext = (EditText)findViewById(R.id.usernameEdit);
        login.setOnClickListener(this);
    }
    @Override
    public void onClick(View view) {
    
    
        String name = loginedittext.getText().toString();
        if("".equals(name))
            Toast.makeText(MainActivity.this,"请输入用户名",Toast.LENGTH_SHORT).show();
        else {
    
    
        //只要输入了名字就进入ChatUI界面
            Intent intent = new Intent(MainActivity.this, ChatUI.class);
            intent.putExtra("username", name);
            startActivity(intent);
        }
    }
}
2.聊天页面
activity_chatui.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="@drawable/eee"
    >
    <TextView
        android:id="@+id/top_TextView"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="0.25"
        android:text="聊天室"
        android:gravity="center"/>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#FF909090"/>
    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/recyclerview_ChatUi"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="4"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:orientation="vertical"
        android:layout_weight="1">
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#FF909090"/>
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:layout_weight="1"
            >
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal">
                <EditText
                    android:id="@+id/ip_editText"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="2"/>

                <Button
                    android:id="@+id/record"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:text="消息记录"/>
                <Button
                    android:id="@+id/cls"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:text="清屏"/>
            </LinearLayout>

        </LinearLayout>
        <View
            android:layout_width="match_parent"
            android:layout_height="1dp"
            android:background="#FF909090"/>
        <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="match_parent"
           android:orientation="vertical"
            android:layout_weight="1">
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal">
                <EditText
                    android:id="@+id/send_editText"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="3"/>
                <Button
                    android:id="@+id/send"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:text="Send"/>
            </LinearLayout>

        </LinearLayout>

    </LinearLayout>




</LinearLayout>
chatui.item.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="wrap_content">
    <TextView
        android:id="@+id/item_data"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        />
    <LinearLayout
        android:id="@+id/item_leftlinearlayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="left">
        <ImageView
            android:id="@+id/item_leftImageView"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:src="@drawable/bbb"
            android:layout_margin="5dp" />
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <TextView
                android:id="@+id/leftname"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginStart="5dp"
                android:layout_marginLeft="5dp"
                />
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/shadow_2"
                >
                <TextView
                    android:id="@+id/item_lefttextview"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_margin="5dp"/>
            </LinearLayout>

        </LinearLayout>

    </LinearLayout>
    <LinearLayout
        android:id="@+id/item_rightlinearlayout"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:layout_gravity="right">
        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical">
            <TextView
                android:id="@+id/rightname"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="right"
                android:layout_marginEnd="5dp"
                android:layout_marginRight="5dp"
                />
            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@drawable/shadow_2"
                >
                <TextView
                    android:id="@+id/item_righttextview"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_gravity="center"
                    android:layout_margin="5dp"/>
            </LinearLayout>

        </LinearLayout>
        <ImageView
            android:id="@+id/item_rightImageView"
            android:layout_width="60dp"
            android:layout_height="60dp"
            android:src="@drawable/bbb"
            android:layout_margin="5dp" />
    </LinearLayout>
</LinearLayout>
ChatUI
package com.example.uichat;
import android.content.Intent;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import org.litepal.LitePal;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.InetAddress;
import java.net.Socket;
import java.net.UnknownHostException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
public class ChatUI extends AppCompatActivity implements View.OnClickListener{
    
    
    private String ip = "192.168.1.2";        //指定服务器ip
    private int port = 12345;                  //指定端口号

    private boolean IStrue = false;			//判断是否连接上服务器
    private Socket socket;
    	//我用DataInputStream，DataOutputStream来和服务器交互
    private DataInputStream dis;	
    private DataOutputStream dos;
    private RecyclerView recyclerView;
    private String myname;
    private int massage_type;
    private ChatAdapt adapt;
    private Button send;
    private Button record;
    private Button cls;
    private EditText ipedit;
    private EditText sendedit;
    private TextView toptext;
    private List<myChat> list = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_chatui);
         //必须重开一条线程不能放到主线程中，负责出现android.os.NetworkOnMainThreadException
        new Thread(new Runnable() {
    
                  
            @Override
            public void run() {
    
    
                try {
    
    
                    if( (socket = new Socket(ip,port))==null){
    
    
                        Toast.makeText(ChatUI.this,"连接服务器失败",Toast.LENGTH_SHORT).show();
                    }else{
    
    
                        IStrue = true;
                        dis = new DataInputStream(socket.getInputStream());
                        dos = new DataOutputStream(socket.getOutputStream());
                        //开一条线程接收服务器传来的信息
                        new Thread(new Revised()).start();
                    }
                } catch (IOException e) {
    
    

                    e.printStackTrace();
                }
            }
        }).start();
        Intent intent = getIntent();
        myname = intent.getStringExtra("username");		//拿到主活动传来的name
		//用recyclerView来显示信息
        recyclerView = (RecyclerView)findViewById(R.id.recyclerview_ChatUi);
        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        recyclerView.setLayoutManager(layoutManager);
        adapt = new ChatAdapt(list);
        recyclerView.setAdapter(adapt);
        send = (Button)findViewById(R.id.send);
        record = (Button)findViewById(R.id.record);
        cls = (Button)findViewById(R.id.cls);
        ipedit = (EditText)findViewById(R.id.ip_editText);
        sendedit = (EditText)findViewById(R.id.send_editText);
        toptext = (TextView)findViewById(R.id.top_TextView);
        send.setOnClickListener(this);
        record.setOnClickListener(this);
        cls.setOnClickListener(this);
    }
    private void AutoDelete() {
    
    
        while (list.size()>20)              //最多显示20条消息
            list.remove(0);
		//这里吧刷新操作全放在 runOnUiThread中，不然会出现异常
        runOnUiThread(new Runnable() {
    
    		
            @Override
            public void run() {
    
    
                // 刷新操作
                adapt.notifyDataSetChanged();
            }

        });

    }
	//接收服务器传来的信息
    class Revised implements Runnable{
    
    
       @Override
       public void run() {
    
    
       //这里必须无限循环，不然只能接到一条信息
           while(true) {
    
    
           
               String title = null;
               String name = null;
               char[] temp = null;
               int len = 0;
               int massagetype = 0;
               char c = 0;
               //这里全是接收信息的，我接受三项信息title， name，temp
               try {
    
    
                   temp = new char[200];
                   len = 0;
                   while ((c = dis.readChar()) != '\t') {
    
    		//用的‘\t’对信息做分割
                       temp[len] = c;
                       len++;
                   }
                   title = new String(temp, 0, len);
                   len = 0;
                   while ((c = dis.readChar()) != '\t') {
    
    
                       temp[len] = c;
                       len++;
                   }
                   name = new String(temp, 0, len);
                   massagetype = dis.readInt();
                   // Log.d("chatui",title+" 4567   "+name+""+massagetype);
               } catch (IOException e) {
    
    
                   e.printStackTrace();
               }
               String data = getdata();
               //吧就收到的信息封装成 myChat对象，添加到集合中
               myChat my = new myChat(title, name, data, myChat.TYPE_RESIVE, massagetype);
               list.add(my);
               AutoDelete();
             
               runOnUiThread(new Runnable() {
    
    
                   @Override
                   public void run() {
    
    
                       // 刷新操作
                       adapt.notifyDataSetChanged();
                   }

               });

           }
       }
   }
   //按钮点击事件
    @Override
    public void onClick(View view) {
    
    
        switch (view.getId()){
    
    
        //如果点了发送要把信息显示到页面同时传给服务器
            case R.id.send:
                {
    
    
                final String title = sendedit.getText().toString();
                String data = getdata();
                final String ip =  ipedit.getText().toString().equals("")?"255.255.255.255":ipedit.getText().toString();
                Log.d("ChatUI",ip);
                if(!"".equals(sendedit.getText().toString())){
    
    

                    if(ipedit.getText().toString().equals("")||ipedit.getText().toString().equals("255.255.255.255")) {
    
    
                        massage_type = myChat.MESSAGE_PUBLIC;
                    }
                    else {
    
    
                        massage_type = myChat.MESSAGE_PRIVATE;
                    }
                  //  Log.d("ChatUI",massage_type+"");
                    if(IStrue){
    
    
                    //开一条线程把信息发给服务器，这里在按钮点击时无限循环，所以这里不用无限循环
                        new Thread(new Runnable() {
    
    
                            @Override
                            public void run() {
    
    
                                try {
    
    
                                    dos.writeChars(title);
                                    dos.writeChar('\t');
                                    dos.writeChars(myname);
                                    dos.writeChar('\t');
                                    dos.writeChars(ip);
                                    dos.writeChar('\t');
                                    Log.d("ChatUI","我发了"+title);
                                } catch (IOException e) {
    
    
                                    e.printStackTrace();
                                }
                            }
                        }).start();
                    }
                    else
                        Toast.makeText(ChatUI.this,"发送失败",Toast.LENGTH_SHORT).show();

					  //把发出的信息封装成 myChat对象，添加到集合中
                    myChat my = new myChat(title,myname,data,myChat.TYPE_SEND,massage_type);
                    list.add(my);
                    AutoDelete();
                    runOnUiThread(new Runnable() {
    
    
                        @Override
                        public void run() {
    
    
                            // 刷新操作
                            adapt.notifyDataSetChanged();
                        }
                    });
                    sendedit.setText("");
                    addressed(title,myname,data);
                }
                break;
            }
            //清空页面的信息
            case R.id.cls: {
    
    
                list.clear();
                runOnUiThread(new Runnable() {
    
    
                    @Override
                    public void run() {
    
    
                        // 刷新操作
                        adapt.notifyDataSetChanged();
                    }

                });
                break;
            }
            //点了消息记录进入recordactivity活用于显示记录
            case R.id.record:{
    
    
                Intent intent = new Intent(ChatUI.this,recordactivity.class);
                startActivity(intent);
                break;
            }
        }
    }
    //获取时间
    private String getdata() {
    
    
        Date data = new Date();
        SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日 HH:mm:ss");
        return sdf.format(data);
    }
    
    //这里用LitPal操作数据库来保存数据，在发消息，收消息时都会用到，用于保存消息记录
    private void addressed(String title, String name, String data) {
    
    
        record r = new record();
        r.setTitle(title);
        r.setData(data);
        r.setName(name);
        r.save();
    }
}
myChat
package com.example.uichat;

public class myChat {
    
    
    public static final int TYPE_SEND = 1;          //信息是发送的还是接收的
    public static final int TYPE_RESIVE = 0;

    public static final int MESSAGE_PRIVATE = 1;	//是私发信息还是群聊
    public static final int MESSAGE_PUBLIC = 0;
    private String title;
    private int type;
    private int massagetype;

    public int getMassagetype() {
    
    
        return massagetype;
    }

    private String name;
    private String data;

    public String getData() {
    
    
        return data;
    }

    public myChat(String title, String name, String data,int type,int messagetype) {
    
    
        this.title = title;
        this.name = name;
        this.data = data;
        this.type = type;
        this.massagetype = messagetype;
    }

    public String getTitle() {
    
    
        return title;
    }

    public int getType() {
    
    
        return type;
    }

    public String getName() {
    
    
        return name;
    }
}
ChatAdapt
package com.example.uichat;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class ChatAdapt extends RecyclerView.Adapter<ChatAdapt.ViewHolder> {
    
    
    private List<myChat> list;
    private String type_public = "[所有人]";
    private String type_private = "[私有消息]";
    static class ViewHolder extends RecyclerView.ViewHolder{
    
    
        LinearLayout leftlinearLayout;
        LinearLayout rightlinearlayout;
        TextView item_data;
        TextView item_leftname;
        TextView item_rightname;
        TextView item_lefttitle;
        TextView item_righttitle;

        public ViewHolder(@NonNull View itemView) {
    
    
            super(itemView);
            leftlinearLayout =(LinearLayout)itemView.findViewById(R.id.item_leftlinearlayout);
            rightlinearlayout = (LinearLayout)itemView.findViewById(R.id.item_rightlinearlayout);
            item_data = (TextView)itemView.findViewById(R.id.item_data);
            item_rightname = (TextView)itemView.findViewById(R.id.rightname);
            item_leftname = (TextView)itemView.findViewById(R.id.leftname);
            item_lefttitle = (TextView)itemView.findViewById(R.id.item_lefttextview);
            item_righttitle = (TextView)itemView.findViewById(R.id.item_righttextview);
        }
    }
    public ChatAdapt(List<myChat> l){
    
    
        list = l;
    }
    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    
    
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.chatui_item,parent,false);
        ViewHolder holder = new ViewHolder(view);
        return holder;
    }
    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    
    
        myChat my = list.get(position);
        if(my.getType()==myChat.TYPE_RESIVE){
    
    
            holder.leftlinearLayout.setVisibility(View.VISIBLE);        //显示左边的
            holder.rightlinearlayout.setVisibility(View.GONE);          //右边隐藏
            holder.item_data.setText(my.getData());
            holder.item_lefttitle.setText(my.getTitle());
            if(my.getMassagetype()==myChat.MESSAGE_PUBLIC){
    
    
                holder.item_leftname.setText(type_public+"  "+my.getName());
            }
            else if(my.getMassagetype()==myChat.MESSAGE_PRIVATE){
    
    
                holder.item_leftname.setText(type_private+"  "+my.getName());
            }

        }
        else if(my.getType()==myChat.TYPE_SEND){
    
    
            holder.leftlinearLayout.setVisibility(View.GONE);              //左边隐藏
            holder.rightlinearlayout.setVisibility(View.VISIBLE);          //右边显示
            holder.item_data.setText(my.getData());
            holder.item_righttitle.setText(my.getTitle());
            Log.d("ChatUI",my.getMassagetype()+"  adapt");
            if(my.getMassagetype()==myChat.MESSAGE_PUBLIC){
    
    
                holder.item_rightname.setText(type_public+"  "+my.getName());
            }
            else if(my.getMassagetype()==myChat.MESSAGE_PRIVATE){
    
    
                holder.item_rightname.setText(type_private+"  "+my.getName());
            }
        }
    }
    @Override
    public int getItemCount() {
    
    
        return list.size();
    }
}
3.消息记录页面
这里用了LitePal操作数据库不懂可点击
activity_recordactivity.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
   >
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">
        <TextView
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="4"
            android:gravity="center"
            android:textSize="24sp"
            android:text="消息记录"/>
        <Button
            android:id="@+id/record_button"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:text = "清空记录"/>
    </LinearLayout>
    <View
        android:layout_width="match_parent"
        android:layout_height="1dp"
        android:background="#FF909090"/>
    <TextView
        android:layout_weight="9"
        android:id="@+id/recordtext"
        android:layout_margin="10dp"
        android:layout_width="match_parent"
        android:layout_height="0dp"/>

</LinearLayout>
recordactivity
package com.example.uichat;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import org.litepal.LitePal;

import java.util.ArrayList;
import java.util.List;

public class recordactivity extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recordactivity);
        final TextView text = (TextView)findViewById(R.id.recordtext);
        List<record> list = LitePal.findAll(record.class);
        String str ="";
        for(record r : list){
    
    
            str += r.getData()+" "+r.getName()+":  "+r.getTitle() +"\n";
        }
        text.setText(str);
        Button recorebutton = (Button)findViewById(R.id.record_button);
        recorebutton.setOnClickListener(new View.OnClickListener() {
    
    
            @Override
            public void onClick(View view) {
    
    
                AlertDialog.Builder dialog = new AlertDialog.Builder(recordactivity.this);
                dialog.setTitle("This is Dialog");
                dialog.setMessage("是否确定删除所有记录");
                dialog.setCancelable(false);
                dialog.setPositiveButton("OK", new DialogInterface.OnClickListener() {
    
    
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
    
    
                        LitePal.deleteAll(record.class);
                        text.setText("");
                    }
                });
                dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
    
    
                    @Override
                    public void onClick(DialogInterface dialogInterface, int i) {
    
    

                    }
                });
                dialog.show();
            }
        });
    }
}
recoed
package com.example.uichat;

import org.litepal.crud.LitePalSupport;

public class record extends LitePalSupport {
    
    
    String title;
    String name;
    String data;
    public String getTitle() {
    
    
        return title;
    }

    public void setTitle(String title) {
    
    
        this.title = title;
    }

    public String getName() {
    
    
        return name;
    }

    public void setName(String name) {
    
    
        this.name = name;
    }

    public String getData() {
    
    
        return data;
    }

    public void setData(String data) {
    
    
        this.data = data;
    }
}
litepal.xml
<?xml version="1.0" encoding="utf-8"?>
<litepal>

    <dbname value="Record"></dbname>
    <version value="1"></version>
    <list>
        <mapping class="com.example.uichat.record"></mapping>
    </list>
</litepal>

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