public void getSingInfo() {		try {			PackageInfo packageInfo = getPackageManager().getPackageInfo(					"wabao.et.master", PackageManager.GET_SIGNATURES);			Signature[] signs = packageInfo.signatures;			Signature sign = signs[0];			parseSignature(sign.toByteArray());		} catch (Exception e) {			e.printStackTrace();		}	}	public void parseSignature(byte[] signature) {		try {			CertificateFactory certFactory = CertificateFactory					.getInstance("X.509");			X509Certificate cert = (X509Certificate) certFactory					.generateCertificate(new ByteArrayInputStream(signature));			String pubKey = cert.getPublicKey().toString();			String signNumber = cert.getSerialNumber().toString();		} catch (CertificateException e) {			e.printStackTrace();		}	}