Question

this 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.


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 android.widget.Toast;

public class SignupActivity extends AppCompatActivity {

    EditText editTextName,editTextEmail,editTextPhone,editTextPswd,editTextCPswd,editTextAge,editTextFatherName;
    Button btnMoveToLogin;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_signup);
        editTextName=findViewById(R.id.editTextName);
        editTextFatherName=findViewById(R.id.editTextFatherName);
        editTextAge=findViewById(R.id.editTextAge);
        editTextPhone=findViewById(R.id.editTextPhoneNumber);
        editTextPswd=findViewById(R.id.editTextPswd);
        editTextCPswd=findViewById(R.id.editTextCPswd);
        editTextEmail=findViewById(R.id.editTextEmail);
        btnMoveToLogin=findViewById(R.id.buttonMoveToLogIn);
        btnMoveToLogin.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Log.i("Name",editTextEmail.getText().toString());
                if(editTextEmail.getText().toString()=="" && editTextFatherName.getText().toString()=="" && editTextPhone.getText().toString()=="" && editTextPswd.getText().toString()=="" && editTextCPswd.getText().toString()=="" && editTextName.getText().toString()=="" && editTextAge.getText().toString()==""){
                    Toast.makeText(SignupActivity.this, "Please enter all the fields", Toast.LENGTH_SHORT).show();
                    return;
                }
                if(editTextCPswd.getText().toString()==editTextPswd.getText().toString()){
                    Toast.makeText(SignupActivity.this, "Passwords do not match!!", Toast.LENGTH_SHORT).show();
                }else{
                    Intent intent=new Intent(SignupActivity.this, LoginActivity.class);
                    startActivity(intent);
                }
            }
        });
    }
}

Answer 1

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 android.widget.Toast;

public class SignupActivity extends AppCompatActivity {

EditText editTextName,editTextEmail,editTextPhone,editTextPswd,editTextCPswd,editTextAge,editTextFatherName;
Button btnMoveToLogin;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
editTextName=findViewById(R.id.editTextName);
editTextFatherName=findViewById(R.id.editTextFatherName);
editTextAge=findViewById(R.id.editTextAge);
editTextPhone=findViewById(R.id.editTextPhoneNumber);
editTextPswd=findViewById(R.id.editTextPswd);
editTextCPswd=findViewById(R.id.editTextCPswd);
editTextEmail=findViewById(R.id.editTextEmail);
      
btnMoveToLogin=findViewById(R.id.buttonMoveToLogIn);
  
       btnMoveToLogin.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.i("Name",editTextEmail.getText().toString());
              
               // if any of the text field is not populated , show toast message
               // trim is used to remove trailing and leading spaces
               // length is used to return the number of characters in the string
if(editTextEmail.getText().toString().trim().length() == 0 || editTextFatherName.getText().toString().trim().length() == 0 || editTextPhone.getText().toString().trim().length() == 0 || editTextPswd.getText().toString().trim().length() == 0 || editTextCPswd.getText().toString().trim().length() == 0 || editTextName.getText().toString().trim().length() == 0 ||
               editTextAge.getText().toString().trim().length() == 0){
Toast.makeText(SignupActivity.this, "Please enter all the fields", Toast.LENGTH_SHORT).show();
  
}else{
                   // if passwords do not match, show toast message
                   if(!editTextCPswd.getText().toString().equals(editTextPswd.getText().toString()))
                   {
                       Toast.makeText(SignupActivity.this, "Passwords do not match!!", Toast.LENGTH_SHORT).show();
                   }else{
                       // All fields are populated and passwords match, hence proceed to the next activity
                       Intent intent=new Intent(SignupActivity.this, LoginActivity.class);
                       startActivity(intent);
                   }
}
}
});
}
}