Layout alignment between classes - Android Studio

Question

I am implementing a program that uses database and interacts by differentlayouts registration and user editing.

I’m working with RelativeLayout on all screens. On one of thelayouts, I insert a perfectly aligned button and give the command to android:visibility="gone" for him to appear when requested.

The problem is that when I need to use it by the command editarBt.setVisibility(View.VISIBLE), the button appears out of alignment and overwrites the fields for typing information.

Is there any way to hold the button by command?

I won’t put the entire code because it has 7 classes, so I’ll put only the classes that matter.

Class Enterpatientactivity

package br.luizhmu.aulas_android_sqlite;

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

/**
* Created by LuizHMU on 2/17/15.
*/
public class EnterPatientActivity extends Activity {

private Paciente paciente = new Paciente();
private EditText nomeEt;
private EditText emailEt;
private EditText senhaEt;
private Button salvarBt;
private Button editarBt;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_inserir_paciente);

    nomeEt = (EditText) findViewById(R.id.editTextNome);
    emailEt = (EditText) findViewById(R.id.editTextEmail);
    senhaEt = (EditText) findViewById(R.id.editTextSenha);
    salvarBt = (Button) findViewById(R.id.buttonSalvar);
    editarBt = (Button) findViewById(R.id.buttonEditar);

    Intent intent = getIntent();
    if(intent != null){
        Bundle bundle = intent.getExtras();
        if(bundle != null){

            paciente.setId(bundle.getLong("id"));
            paciente.setNome(bundle.getString("nome"));
            paciente.setEmail(bundle.getString("email"));

            nomeEt.setText(paciente.getNome());
            emailEt.setText(paciente.getEmail());

            senhaEt.setVisibility(View.GONE);
            salvarBt.setVisibility(View.GONE);
            editarBt.setVisibility(View.VISIBLE);

        }
    }
}

public void salvar(View view){
    paciente.setNome(nomeEt.getText().toString());
    paciente.setEmail(emailEt.getText().toString());
    paciente.setSenha(senhaEt.getText().toString());

    DataBase bd = new DataBase(this);
    bd.inserir(paciente);

    Toast.makeText(this, "Paciente inserido com sucesso!", Toast.LENGTH_SHORT).show();
}


public void editar(View view){
    paciente.setNome(nomeEt.getText().toString());
    paciente.setEmail(emailEt.getText().toString());

    DataBase bd = new DataBase(this);
    bd.atualizar(paciente);

    Toast.makeText(this, "Paciente \""+paciente.getNome()+"\" atualizado com sucesso.", Toast.LENGTH_SHORT).show();
}

}

activity_inserir_patient.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:background="#ffffea0a"
tools:context=".EnterPatientActivity">

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="Novo paciente"
    android:id="@+id/textView3"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:textColor="#ff1727ff"
    android:textSize="20dp"/>

<EditText
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textPersonName"
    android:hint="*Nome"
    android:ems="10"
    android:id="@+id/editTextNome"
    android:layout_below="@+id/textView3"
    android:layout_alignRight="@+id/buttonSalvar"
    android:layout_alignEnd="@+id/buttonSalvar" />

<EditText
    android:hint="Telefone"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="phone"
    android:ems="10"
    android:id="@+id/editTextTelefone"
    android:layout_below="@+id/editTextNome"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

<EditText
    android:hint="*E-mail"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textEmailAddress"
    android:ems="10"
    android:id="@+id/editTextEmail"
    android:layout_below="@+id/editTextTelefone"
    android:layout_alignLeft="@+id/editTextTelefone"
    android:layout_alignStart="@+id/editTextTelefone" />

<EditText
    android:hint="*Senha"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:inputType="textPassword"
    android:ems="10"
    android:id="@+id/editTextSenha"
    android:layout_below="@+id/editTextEmail"
    android:layout_alignLeft="@+id/editTextEmail"
    android:layout_alignStart="@+id/editTextEmail" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Salvar"
    android:id="@+id/buttonSalvar"
    android:onClick="salvar"
    android:layout_below="@+id/textView4"
    android:layout_alignRight="@+id/editTextSenha"
    android:layout_alignEnd="@+id/editTextSenha" />

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Editar"
    android:id="@+id/buttonEditar"
    android:layout_alignTop="@+id/buttonSalvar"
    android:layout_toLeftOf="@+id/buttonSalvar"
    android:layout_toStartOf="@+id/buttonSalvar"
    android:visibility="gone"
    android:onClick="editar"/>

<TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textAppearance="?android:attr/textAppearanceSmall"
    android:text="* Campos de preenchimento obrigatório"
    android:textColor="#000000"
    android:id="@+id/textView4"
    android:layout_below="@+id/editTextSenha"
    android:layout_alignLeft="@+id/editTextSenha"
    android:layout_alignStart="@+id/editTextSenha" />


</RelativeLayout>

Answer 1

According to the android documentation:

View.GONE This view is Invisible, and it doesn’t take any space for layout purposes.

View.INVISIBLE This view is Invisible, but it still takes up space for layout purposes.

That is to say, when you use View.GONE your button does not take up any screen space, in this case even you aligning the button in xml while using the property View.GONE this alignment is lost.

In the case of View.INVISIBLE it maintains layout alignment and just leaves its component invisible.