title: SQLiteConstraintException?
body: <p>Good morning, I have a problem, I created my <code>sqlite</code> <code>database</code> and it worked correctly without problem, and when entering data my bank is not giving a problem:</p>
  
  <pre><code>11-24 09:08:00.686 23239-23239/com.crudhightech.livros/System.out:
  android.database.sqlite.SQLiteConstraintException: NOT NULL constraint failed: LISTA.DATA (code 1299)
  </code></pre>
  
  <p>method:</p>
  
  <pre><code>public void inserir(Livros livros)
  {
      ContentValues contentValues = new ContentValues();
      contentValues.put("NOME", livros.nome);
      contentValues.put("PAGINAS", livros.paginas);
      contentValues.put("DATA", livros.data);
      contentValues.put("HORAS", livros.hora);
  
      conexao.insertOrThrow("LISTA", null, contentValues);
  }
  </code></pre>
  
  <p>help me</p>