I am developing an app that needs to register the user, and I am having problems when I started developing some functions to verify if everything is wright, I think that is a problem in the array, but I don't have any idea of how to solve it...
To explain what is going on, basically I started the button and when I click it, it will store all texts in editTexts on array dados, then he will start to verify all the informations, first looking if there is something blank, and then if is a valid username, email, and the same passwords, if everything is wright he will change to next step of register, otherwise an error message will appear and every EditText will be set as "".
XML
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".CadastroPt1">
<Button
android:id="@ id/btnCadastrar"
android:layout_width="220dp"
android:layout_height="66dp"
android:layout_marginTop="108dp"
android:backgroundTint="@color/laranja"
android:clickable="false"
android:text="Cadastre-se"
android:textSize="18sp"
app:cornerRadius="35px"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.476"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/constraintLayout3" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="@ id/constraintLayout3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/textView4">
<TextView
android:id="@ id/textView8"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/roboto_regular"
android:text="Nome completo:"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@ id/txtNome"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="@ id/textView11"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:fontFamily="@font/roboto_regular"
android:text="Senha:"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@ id/txtSenhaCadastro"
app:layout_constraintTop_toBottomOf="@ id/txtEmailCadastro" />
<EditText
android:id="@ id/txtNome"
android:layout_width="320dp"
android:layout_height="38sp"
android:layout_marginTop="10dp"
android:background="@drawable/custom_input"
android:ems="10"
android:hint="Nome"
android:inputType="textPersonName"
android:lineSpacingExtra="14sp"
android:padding="8sp"
android:textAlignment="textStart"
app:layout_constraintStart_toStartOf="@ id/textView9"
app:layout_constraintTop_toBottomOf="@ id/textView8" />
<EditText
android:id="@ id/txtConfirmeSenha"
android:layout_width="320dp"
android:layout_height="38sp"
android:layout_marginTop="10dp"
android:background="@drawable/custom_input"
android:ems="10"
android:hint="Confirme sua senha"
android:inputType="textPassword"
android:lineSpacingExtra="14sp"
android:padding="8sp"
android:textAlignment="textStart"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/textView10" />
<TextView
android:id="@ id/textView10"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:fontFamily="@font/roboto_regular"
android:text="Confirme sua senha:"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@ id/txtConfirmeSenha"
app:layout_constraintTop_toBottomOf="@ id/txtSenhaCadastro" />
<TextView
android:id="@ id/textView9"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:fontFamily="@font/roboto_regular"
android:text="E-mail:"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="@ id/txtEmailCadastro"
app:layout_constraintTop_toBottomOf="@ id/txtNome" />
<EditText
android:id="@ id/txtEmailCadastro"
android:layout_width="320dp"
android:layout_height="38sp"
android:layout_marginTop="10dp"
android:background="@drawable/custom_input"
android:ems="10"
android:hint="E-mail"
android:inputType="textEmailAddress"
android:lineSpacingExtra="14sp"
android:padding="8sp"
android:textAlignment="textStart"
app:layout_constraintStart_toStartOf="@ id/textView11"
app:layout_constraintTop_toBottomOf="@ id/textView9" />
<EditText
android:id="@ id/txtSenhaCadastro"
android:layout_width="320dp"
android:layout_height="38sp"
android:layout_marginTop="10dp"
android:background="@drawable/custom_input"
android:ems="10"
android:hint="Senha"
android:inputType="textPassword"
android:lineSpacingExtra="14sp"
android:padding="8sp"
android:textAlignment="textStart"
app:layout_constraintStart_toStartOf="@ id/textView10"
app:layout_constraintTop_toBottomOf="@ id/textView11" />
</androidx.constraintlayout.widget.ConstraintLayout>
<ImageView
android:id="@ id/imageView3"
android:layout_width="230sp"
android:layout_height="80sp"
android:layout_marginTop="50dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@drawable/logotechtablecolorida" />
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="320dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/constraintLayout3">
<com.google.android.material.textfield.TextInputLayout
style="@style/Widget.MaterialComponents.TextInputLayout.OutlinedBox.ExposedDropdownMenu"
android:layout_width="200dp"
android:layout_height="65dp"
android:layout_margin="16dp"
android:backgroundTint="@color/black"
android:foregroundTint="@color/laranja"
android:hint="@string/select"
app:boxStrokeColor="@color/laranja"
app:hintTextColor="@color/black"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent">
<AutoCompleteTextView
android:id="@ id/auto_complete_txt"
android:layout_width="200dp"
android:layout_height="55dp"
android:fontFamily="@font/roboto_regular"
android:inputType="none"
android:padding="10sp"
android:gravity="center_vertical"
android:textColor="@color/black"
android:textSize="16sp"
tools:ignore="TouchTargetSizeCheck" />
</com.google.android.material.textfield.TextInputLayout>
<TextView
android:id="@ id/textView17"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:fontFamily="@font/roboto_regular"
android:text="Gênero:"
android:textSize="18sp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
<TextView
android:id="@ id/textView4"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:fontFamily="@font/lgeorge_bold"
android:text="Cadastre-se"
android:textSize="20sp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@ id/imageView3" />
</androidx.constraintlayout.widget.ConstraintLayout>
Activity
package com.example.techtable;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Patterns;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class CadastroPt1 extends AppCompatActivity {
private Button btnPt2;
// Objetos para o autocomplete do genero
String[] generos = {"Masculino", "Feminino", "Outro"};
AutoCompleteTextView autoCompleteTxt;
ArrayAdapter<String> adapterItens;
// Declaração dos inputs
EditText txtNome;
EditText txtEmail;
EditText txtSenhaCadastro;
EditText txtConfirmeSenha;
String[] dados = new String[4];
String genero;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cadastro_pt1);
// Instanciamento dos editTexts
txtNome = (EditText) findViewById(R.id.txtNome);
txtEmail = (EditText)findViewById(R.id.txtEmail);
txtSenhaCadastro = (EditText)findViewById(R.id.txtSenhaCadastro);
txtConfirmeSenha = (EditText)findViewById(R.id.txtConfirmeSenha);
// Obter gênero do usuario
autoCompleteTxt = findViewById(R.id.auto_complete_txt);
adapterItens = new ArrayAdapter<>(this, R.layout.list_item, generos);
autoCompleteTxt.setAdapter(adapterItens);
autoCompleteTxt.setOnItemClickListener((parent, view, position, id) -> {
// String do genero selecionado
genero = parent.getItemAtPosition(position).toString();
});
// Botão para prosseguir
btnPt2 = findViewById(R.id.btnCadastrar);
btnPt2.setOnClickListener(view ->{
// Coleta de dados inseridos:
dados[0] = txtNome.getText().toString();
dados[1] = txtEmail.getText().toString();
dados[2] = txtSenhaCadastro.getText().toString();
dados[3] = txtConfirmeSenha.getText().toString();
dados[4] = genero;
if(verificarInformacoes(dados)) {
irParaPt2();
} else{
// Limpar dados:
txtNome.setText("");
txtEmail.setText("");
txtSenhaCadastro.setText("");
txtConfirmeSenha.setText("");
}
});
}
public void irParaPt2(){
Intent intent = new Intent(this, CadastroPt2.class);
startActivity(intent);
}
public boolean verificarInformacoes(String[] dadosInfo){
setContentView(R.layout.activity_cadastro_pt1);
int c = 0;
boolean verificador = true;
// Verificar se há dados vázios:
while (c <= 4){
if(dadosInfo[c].isEmpty()){
Toast.makeText(getApplicationContext(), "Preencha todos os espaços!", Toast.LENGTH_LONG).show();
verificador = false;
}
c ;
}
// Verificar formato dos valores:
// Se houver numeros ou simbolos no nome retorne falso:
if(!dadosInfo[0].matches("[a-zA-Z] ")){
Toast.makeText(getApplicationContext(), "Nome inválido!", Toast.LENGTH_LONG).show();
verificador = false;
}
// Se email não for válido ao padrao retorne falso:
if(!Patterns.EMAIL_ADDRESS.matcher(dadosInfo[1]).matches()){
Toast.makeText(getApplicationContext(), "Email inválido!", Toast.LENGTH_LONG).show();
verificador = false;
}
// Se senhas não forem iguais retorne falso:
if(dadosInfo[2].equals(dadosInfo[3])){
Toast.makeText(getApplicationContext(), "Senhas não batem!", Toast.LENGTH_LONG).show();
verificador = false;
}
// Verificar se algo trocou verificador para false:
return verificador;
}
}
LogCat Error
2022-06-20 19:09:54.666 8912-8912/com.example.techtable E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.techtable, PID: 8912
java.lang.NullPointerException: Attempt to invoke virtual method 'android.text.Editable android.widget.EditText.getText()' on a null object reference
at com.example.techtable.CadastroPt1.lambda$onCreate$1$CadastroPt1(CadastroPt1.java:58)
at com.example.techtable.-$$Lambda$CadastroPt1$Lpk7Jb4k4tSRL0kGZRZbPTDcMh8.onClick(Unknown Source:2)
at android.view.View.performClick(View.java:8160)
at android.widget.TextView.performClick(TextView.java:16222)
at com.google.android.material.button.MaterialButton.performClick(MaterialButton.java:1131)
at android.view.View.performClickInternal(View.java:8137)
at android.view.View.access$3700(View.java:888)
at android.view.View$PerformClick.run(View.java:30236)
at android.os.Handler.handleCallback(Handler.java:938)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:246)
at android.app.ActivityThread.main(ActivityThread.java:8653)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
CodePudding user response：
There are two errors here. The first is that there is no object named txtEmail. Another is that the length of the dados array is entered incorrectly. Changes you need to make:
txtEmail = (EditText)findViewById(R.id.txtEmailCadastro);
The other is:
String[] dados = new String[5];
Because:
dados[0] = txtNome.getText().toString();
dados[1] = txtEmail.getText().toString();
dados[2] = txtSenhaCadastro.getText().toString();
dados[3] = txtConfirmeSenha.getText().toString();
dados[4] = genero;
You used five objects here, not four.