Sqlite bank closed when query

Question

Good afternoon, I’m making an android application, I’m having some problems with the bank. When it runs on the emulator it calls the seller’s Activity after saved, it calls login, login has a getConfiguration() method, it is in the configuration method that the error occurs when opening the database, all methods of the DAO classes have the same structure as the Seller’s. Someone what I’m doing wrong!!

public void salvarVendedor(Vendedor vendedor){
    bancoDados.escrever().beginTransaction();
    try {
        values = new ContentValues();
        values.put("id_vendedor",vendedor.getIdVendedor());
        values.put("login",vendedor.getLogin());
        values.put("senha",vendedor.getSenha());
        values.put("desconto",vendedor.getDesconto());
        values.put("mac",vendedor.getMac());
        values.put("inativo", vendedor.getInativo());
        values.put("valor_verba", vendedor.getValorVerba());

        bancoDados.escrever().insert("TB_VENDEDORES",null,values);
        bancoDados.escrever().setTransactionSuccessful();
    } catch (SQLiteException e){
        Log.i("Erro ","salvar vendedor" + e.getMessage());
    } finally {
        bancoDados.escrever().endTransaction();
        bancoDados.close();
    }
}