Issue in android studios

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Java

Android

MongoDB

I am using android studios and MongoDB atlas as database. But I cannot take output at the "usernameval" string. Please check my code and help me.




The output for " Log.v("msg","name"+usernameval);" in page 1 is

V/msg: name
thus value of usernameval is not shown.
please help

What I have tried:

my code:

page1=
package com.example.messanger;

import androidx.appcompat.app.AppCompatActivity;

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

import io.realm.Realm;
import io.realm.mongodb.App;
import io.realm.mongodb.AppConfiguration;

public class USERNAME extends AppCompatActivity {
String Appid="application-2-meqlj";
EditText usernamegiven;
Button name;
String usernameval;
public static final String USERNAME1="com.example.messanger.extra.Username";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_username);
Intent intent=new Intent(this,Login.class);
App app=new App(new AppConfiguration.Builder(Appid).build());




usernamegiven=findViewById(R.id.UserNameInput);
name=findViewById(R.id.NameContinue);
Realm.init(this);
usernameval=usernamegiven.getText().toString();
Log.v("msg","name"+usernameval);
intent.putExtra(USERNAME1,usernameval);

name.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
startActivity(intent);
}
});



}
}

page2=
package com.example.messanger;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import org.bson.Document;

import io.realm.Realm;
import io.realm.mongodb.App;
import io.realm.mongodb.AppConfiguration;
import io.realm.mongodb.Credentials;
import io.realm.mongodb.User;
import io.realm.mongodb.mongo.MongoClient;
import io.realm.mongodb.mongo.MongoCollection;
import io.realm.mongodb.mongo.MongoDatabase;

public class Login extends AppCompatActivity {
String Appid="application-2-meqlj";
EditText email;
EditText password;
MongoDatabase mongoDatabase;
MongoClient mongoClient;
MongoCollection mongoCollection;
User user;
public static final String EMAIL="com.example.messanger.extra.Name";
public static final String PASSWORD="com.example.messanger.extra.Name";

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
email=findViewById(R.id.EmailAddressLogin);
password=findViewById(R.id.PasswordLogin);
Realm.init(this);

}
public void onStart(View v){
App app=new App(new AppConfiguration.Builder(Appid).build());

Intent intent=new Intent(this,MainPage.class);
Intent intentlog=getIntent();
String usernamelog=intentlog.getStringExtra(USERNAME.USERNAME1);

String emailval=email.getText().toString();
String passwordval=password.getText().toString();

Credentials credentials=Credentials.emailPassword(emailval,passwordval);
app.loginAsync(credentials, new App.Callback<user>() {
@Override
public void onResult(App.Result<user> result) {
if(result.isSuccess()){
startActivity(intent);
}
else {
Toast.makeText(Login.this, "incorrect val", Toast.LENGTH_SHORT).show();
}
}
});


intent.putExtra(EMAIL,emailval);
intent.putExtra(PASSWORD,passwordval);

if (usernamelog!=null) {


user = app.currentUser();
mongoClient = user.getMongoClient("mongodb-atlas");
mongoDatabase = mongoClient.getDatabase("MessageUsers");
mongoCollection = mongoDatabase.getCollection("UserName");
Document document = new Document("userId", user.getId()).append("Username", usernamelog);
mongoCollection.insertOne(document).getAsync(result -> {
if (result.isSuccess()) {
Log.v("Data", "done");
Log.v("msg","name"+usernamelog);

} else {
Log.v("Data", "Failed" + result.getError().toString());
}
;

});
}




}
}