我正在开发一个Android项目。我有一个PEM证书字符串:-----BEGINCERTIFICATE-----MIIEczCCA1ugAwIBAgIBADANBgkqhkiG9w0BAQQFAD..AkGA1UEBhMCR0IxEzARBgNVBAgTClNvbWUtU3RhdGUxFDASBgNVBAoTC0..0EgTHRkMTcwNQYDVQQLEy5DbGFzcyAxIFB1YmxpYyBQcmltYXJ5IENlcn..XRpb24gQXV0aG9y...MANYLINES...It8una2gY4l2O//on88r5IWJlm1L0oA8e4fR2yrBHX..adsG