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this login java code allows to proceed to next activity even if no data is enetered. add a constraint which displays a message to fill all fields.

package com.example.Divahalls;

import androidx.appcompat.app.AppCompatActivity;

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

public class LoginActivity extends AppCompatActivity {

    Button btnMoveToDashboard;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        btnMoveToDashboard=findViewById(R.id.buttonMoveToDashboard);
        btnMoveToDashboard.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent=new Intent(LoginActivity.this,CustomerActivity.class);
                startActivity(intent);
            }
        });
    }
}

Answer 1

package com.example.Divahalls;

import androidx.appcompat.app.AppCompatActivity;

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

public class LoginActivity extends AppCompatActivity {
    
    Button btnMoveToDashboard;
    //i am defining fields according to me please add more if there are more than two fields
    Edittext username,password;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_login);
        btnMoveToDashboard=findViewById(R.id.buttonMoveToDashboard);
        username=findViewById(R.id."ADD ID WHICH YOU HAVE DEFINED IN activity_login.xml");
        password=findViewById(R.id."ADD ID WHICH YOU HAVE DEFINED IN activity_login.xml");
        btnMoveToDashboard.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                String name = username.getText().toString().trim();
                String pass = password.getText().toString().trim();
                if (TextUtils.isEmpty(name) || TextUtils.isEmpty(pass) "Add more OR conditions if there are more than 2 fields"){
                    

Toast.makeText(LoginActivity.this, "Fields cannot be empty....", Toast.LENGTH_SHORT).show();

                }
                else{
                    Intent intent=new Intent(LoginActivity.this,CustomerActivity.class);
                    startActivity(intent);
                }
            }
        });
    }
}