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I have 2 Activity the contact cadstro and the contacts, the registration the code is like this:
package com.example.marcio.agendacontatos;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
import com.example.marcio.agendacontatos.database.DataBase;
import com.example.marcio.agendacontatos.dominio.RepositorioContato;
import com.example.marcio.agendacontatos.dominio.entidades.Contato;
import java.util.Date;
public class ActCadContatos extends AppCompatActivity {
private EditText edtNome;
private EditText edtEmail;
private EditText edtTelefone;
private EditText edtEndereco;
private EditText edtDatasEspeciais;
private EditText edtGrupos;
private Spinner spnTipoEmail;
private Spinner spnTipoTelefone;
private Spinner spnTipoEndereco;
private Spinner spnDatasEspeciais;
private ArrayAdapter adpTipoEmail;
private ArrayAdapter adpTipoTelefone;
private ArrayAdapter adpTipoEndereco;
private ArrayAdapter adpDatasEspeciais;
private DataBase dataBase;//banco de dados
private SQLiteDatabase conn; //conexão do banco
private RepositorioContato repositorioContato;
private Contato contato;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_cad_contatos);
edtNome = (EditText) findViewById(R.id.edtNome);
edtEmail = (EditText) findViewById(R.id.edtEmail);
edtTelefone = (EditText) findViewById(R.id.edtTelefone);
edtEndereco = (EditText) findViewById(R.id.edtEndereco);
edtDatasEspeciais = (EditText) findViewById(R.id.edtDatasEspeciais);
edtGrupos = (EditText) findViewById(R.id.edtGrupos);
spnTipoEmail = (Spinner) findViewById(R.id.spnTipoEmail);
spnTipoTelefone = (Spinner) findViewById(R.id.spnTipoTelefone);
spnTipoEndereco = (Spinner) findViewById(R.id.spnTipoEndereco);
spnDatasEspeciais = (Spinner) findViewById(R.id.spnDatasEspeciais);
//aqui criei as instâncias de cada objeto tipo arrayadapter;
adpTipoEmail = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adpTipoEmail.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adpTipoTelefone = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adpTipoTelefone.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adpTipoEndereco = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adpTipoEndereco.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adpDatasEspeciais = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item);
adpDatasEspeciais.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//associando cada objeto spinner ao arrayadpater
spnTipoEmail.setAdapter(adpTipoEmail);
spnTipoTelefone.setAdapter(adpTipoTelefone);
spnTipoEndereco.setAdapter(adpTipoEndereco);
spnDatasEspeciais.setAdapter(adpDatasEspeciais);
//adicionando os tipos no spinner
adpTipoEmail.add("Casa");
adpTipoEmail.add("Trabalho");
adpTipoEmail.add("Outros");
adpTipoTelefone.add("Celular");
adpTipoTelefone.add("Trabalho");
adpTipoTelefone.add("Casa");
adpTipoTelefone.add("Fax");
adpTipoTelefone.add("Principal");
adpTipoTelefone.add("Fax Trabalho");
adpTipoTelefone.add("Outros");
adpTipoEndereco.add("Casa");
adpTipoEndereco.add("Trabalho");
adpTipoEndereco.add("Outros");
adpDatasEspeciais.add("Aniversario");
adpDatasEspeciais.add("Data Comemorativa");
adpDatasEspeciais.add("Outros");
//sempre por o bloco do banco de dados em um try catch para tratar a exceção, caso exista.
try {
dataBase = new DataBase(this);
conn = dataBase.getWritableDatabase();
repositorioContato = new RepositorioContato(conn);
} catch (SQLException ex) {
//mensagem de erro
AlertDialog.Builder dlg = new AlertDialog.Builder(this);
dlg.setMessage("Erro ao criar o banco" + ex.getMessage());//retornei o erro
dlg.setNeutralButton("OK", null);//botão
dlg.show();
}
}
//responsável por fazer a associação do meu menu com a classe de contatos
@Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu_act_cad_contatos, menu);
return super.onCreateOptionsMenu(menu);
}
//responsável pela seleção da opção da ação dos menus
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.mni_acao1:
if (contato == null) {
inserir();
}
finish();
break;
case R.id.mni_acao2:
break;
}
return super.onOptionsItemSelected(item);
}
private void inserir() {
try {
contato = new Contato();
contato.setNome(edtNome.getText().toString());
contato.setTelefone(edtTelefone.getText().toString());
contato.setEmail(edtEmail.getText().toString());
contato.setEndereco(edtEndereco.getText().toString());
Date date = new Date();
contato.setDatasEspeciais(date);
contato.setGrupos(edtGrupos.getText().toString());
contato.setTipoTelefone("");
contato.setTipoEmail("");
contato.setTipoEndereco("");
contato.setTipoDatasEspeciais("");
repositorioContato.inserir(contato);
} catch (Exception ex) {
//mensagem de erro
AlertDialog.Builder dlg = new AlertDialog.Builder(this);
dlg.setMessage("Erro ao inserir os dados" + ex.getMessage());//retornei o erro
dlg.setNeutralButton("OK", null);//botão
dlg.show();
}
}
}
And the Contact so:
package com.example.marcio.agendacontatos;
import android.content.Intent;
import android.database.SQLException;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.ListView;
import com.example.marcio.agendacontatos.database.DataBase;
import com.example.marcio.agendacontatos.dominio.RepositorioContato;
public class ActContato extends AppCompatActivity implements View.OnClickListener {
private ImageButton btnAdicionar;
private EditText edtPesquisa;
private ListView lstContatos;
private ArrayAdapter<String> adpContatos;
private DataBase dataBase;//banco de dados
private SQLiteDatabase conn; //conexão do banco
private RepositorioContato repositorioContato;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.act_contato);
btnAdicionar = (ImageButton) findViewById(R.id.btnAdicionar);
edtPesquisa = (EditText) findViewById(R.id.edtPesquisa);
lstContatos = (ListView) findViewById(R.id.lstContatos);
btnAdicionar.setOnClickListener(this);
//sempre por o bloco do banco de dados em um try catch para tratar a exceção, caso exista.
try {
dataBase = new DataBase(this);
conn = dataBase.getWritableDatabase();
repositorioContato = new RepositorioContato(conn);
/*repositorioContato.testeInserirContatos();*/
adpContatos = repositorioContato.buscaContatos(this);
lstContatos.setAdapter(adpContatos);//vinculei o listview ao adpContatos p/ exibir na tela
/*//mensagem de teste no banco
AlertDialog.Builder dlg = new AlertDialog.Builder(this);
dlg.setMessage("Conexão criada com sucesso");
dlg.setNeutralButton("OK", null);//botão
dlg.show();*/
} catch (SQLException ex) {
//mensagem de erro
AlertDialog.Builder dlg = new AlertDialog.Builder(this);
dlg.setMessage("Erro ao criar o banco" + ex.getMessage());//retornei o erro
dlg.setNeutralButton("OK", null);//botão
dlg.show();
}
}
@Override
public void onClick(View v) {
//responsável por chamar a tela de cadContatos
Intent it = new Intent(this, ActCadContatos.class);
startActivityForResult(it, 0);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
adpContatos = repositorioContato.buscaContatos(this);
lstContatos.setAdapter(adpContatos);
}
}
The Repository Classcontacts look like this:
Private Sqlitedatabase Conn;
//referencia da conexão com o banco de dados
public RepositorioContato(SQLiteDatabase conn) {
this.conn = conn;
}
public void inserir(Contato contato) {
ContentValues values = new ContentValues();
values.put("NOME", contato.getNome());
values.put("TELEFONE", contato.getTelefone());
values.put("TIPOTELEFONE", contato.getTipoTelefone());
values.put("EMAIL", contato.getEmail());
values.put("TIPOEMAIL", contato.getTipoEmail());
values.put("ENDERECO", contato.getEndereco());
values.put("DATASESPECIAIS", contato.getDatasEspeciais().getTime());//para retornar datas
values.put("TIPODATASESPECIAIS", contato.getTipoDatasEspeciais());
values.put("GRUPOS", contato.getGrupos());
conn.insertOrThrow("CONTATO",null, values);//salvar os dados passados no cadastro
}
public ArrayAdapter<String> buscaContatos(Context context) {
ArrayAdapter<String> adpContatos = new ArrayAdapter<String>(context, android.R.layout.simple_list_item_1);
//metodo utlizado para realizar a consulta
Cursor cursor = conn.query("CONTATO", null, null, null, null, null, null);
if (cursor.getCount() > 0) {
cursor.moveToFirst();
//esse laço vai correr todos os itens da tabela enquanto houver registros
do {
String telefone = cursor.getString(1);
adpContatos.add(telefone);
} while (cursor.moveToNext());
}
return adpContatos;
}
}
The error that is appearing is as follows:
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.marcio.agendacontatos, PID: 12531
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.lang.Object.toString()' on a null object reference
at android.widget.ArrayAdapter.createViewFromResource(ArrayAdapter.java:401)
at android.widget.ArrayAdapter.getView(ArrayAdapter.java:369)
at android.widget.AbsListView.obtainView(AbsListView.java:2937)
at android.widget.ListView.makeAndAddView(ListView.java:1945)
at android.widget.ListView.fillDown(ListView.java:719)
at android.widget.ListView.fillFromTop(ListView.java:785)
at android.widget.ListView.layoutChildren(ListView.java:1735)
at android.widget.AbsListView.onLayout(AbsListView.java:2731)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1742)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.support.v7.widget.ActionBarOverlayLayout.onLayout(ActionBarOverlayLayout.java:443)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1742)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:344)
at android.widget.FrameLayout.onLayout(FrameLayout.java:281)
at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:3146)
at android.view.View.layout(View.java:17993)
at android.view.ViewGroup.layout(ViewGroup.java:5817)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2755)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2456)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1524)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7520)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:622)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7325)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Application terminated.
I can’t find where the error is, I imagine it must be because I’m trying to find a null object... but I couldn’t identify the error.
The problem is related to
Adapter. What comes in this lineadpContatos = repositorioContato.buscaContatos(this);is valid ? What you haveadpContatos?– Isac
@Isac first thank you for your attention. I put the Repositoriocontact class on top. Apparently it is valid.
– Marcio Silva
If you are in Android Studio use Debug mode and go line by line until error
– GabrielLocalhost
Probably this line is returning null: String phone = cursor.getString(1);
– Alexandre Guerreiro
@Gabriellocalhost tried the Debug mode, but at the time I put it to run, the project starts and already ends, returning the error described above.
– Marcio Silva
@Alexandreguerreiro Good night, when I use the SOUT print some information on the logcat, but it does not show where the error is. Anyway thanks for the help.
– Marcio Silva
Problem solved, I changed the type of Adpter that was as String for Contact.
– Marcio Silva