eu coloquei apenas esta linha no try: JSONObject obj = new JSONObject(resultado);
e o erro exibido foi o mesmo. Bom o meu json é este.:
"[{\"Codigo\":\"1\",\"DataAtualizacao\":\"29/06/2009 00:00:00\",\"Nome\":\"CONSUMIDOR FINAL\",\"NomeFantasia\":\"CONSUMIDOR FINAL\",\"TipoDoc\":\"CNPJ\",\"Doc\":\"00000000000000\",\"IdEstrangeiro\":\"\",\"Cce\":\"\",\"Rg\":\"\",\"Endereco\":\"AV. IMAGINARIA\",\"Numero\":\"00000\",\"Complemento\":\" \",\"Bairro\":\"CENTRO\",\"Cep\":\"76630000\",\"CodigoMunicipio\":\"5210406\",\"Uf\":\"GO\",\"CodigoPais\":\"1058\",\"Telefone\":\"33750000\",\"Celular\":\"\",\"Email\":\"COMERCIAL@PORTALSIGMA.COM\",\"LimiteCredito\":\"9999\",\"ClassificacaoFinanceira\":\"C\",\"Referencia1\":\"\",\"FoneReferencia1\":\"\",\"Referencia2\":\"\",\"FoneReferencia2\":\"\",\"Referencia3\":\"\",\"FoneReferencia3\":\"\",\"Contato1\":\"\",\"Contato2\":\"\",\"CodigoRota\":\"1\",\"CodigoTipo\":\"1\",\"ContribuinteIcms\":\"\",\"OptanteSn\":\"0\",\"Inativo\":\"0\",\"Observacao1\":\"\",\"Sync\":\"\",\"ClassificacaoVenda\":\"9\"},{\"Codigo\":\"1\",\"DataAtualizacao\":\"29/06/2009 00:00:00\",\"Nome\":\"CONSUMIDOR FINAL\",\"NomeFantasia\":\"CONSUMIDOR FINAL\",\"TipoDoc\":\"CNPJ\",\"Doc\":\"00000000000000\",\"IdEstrangeiro\":\"\",\"Cce\":\"\",\"Rg\":\"\",\"Endereco\":\"AV. IMAGINARIA\",\"Numero\":\"00000\",\"Complemento\":\" \",\"Bairro\":\"CENTRO\",\"Cep\":\"76630000\",\"CodigoMunicipio\":\"5210406\",\"Uf\":\"GO\",\"CodigoPais\":\"1058\",\"Telefone\":\"33750000\",\"Celular\":\"\",\"Email\":\"COMERCIAL@PORTALSIGMA.COM\",\"LimiteCredito\":\"9999\",\"ClassificacaoFinanceira\":\"C\",\"Referencia1\":\"\",\"FoneReferencia1\":\"\",\"Referencia2\":\"\",\"FoneReferencia2\":\"\",\"Referencia3\":\"\",\"FoneReferencia3\":\"\",\"Contato1\":\"\",\"Contato2\":\"\",\"CodigoRota\":\"1\",\"CodigoTipo\":\"1\",\"ContribuinteIcms\":\"\",\"OptanteSn\":\"0\",\"Inativo\":\"0\",\"Observacao1\":\"\",\"Sync\":\"\",\"ClassificacaoVenda\":\"10\"}]"