//这个md5跟腾讯的对应

public Signature getPackageSignature( ){

        Context context=getContext();

        String packageName="com.jtys114.ddl";

        PackageManager pm = context.getPackageManager();

        List<PackageInfo> apps = pm.getInstalledPackages(PackageManager.GET_SIGNATURES);

        Iterator<PackageInfo> it = apps.iterator();

        while(it.hasNext()){

            PackageInfo info = it.next();

            if(info.packageName.equals(packageName)){

                Signature s= info.signatures[];

                String cString= s.toCharsString();

                String md5=MD5.getMessageDigest(s.toByteArray());

                return s;

            }

        }

        return null;

    }

    public void getSingInfo() {

        try {

            PackageInfo packageInfo = this.getContext().getPackageManager().getPackageInfo("com.jtys114.ddl", PackageManager.GET_SIGNATURES);

            Signature[] signs = packageInfo.signatures;

            Signature sign = signs[];

            parseSignature(sign.toByteArray());

        } catch (Exception e) {

            e.printStackTrace();

        }

    }

    private 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();

            String signName=cert.getSigAlgName();

            String subjectDN=cert.getSubjectDN().toString();

            Log.d("T", "signName:" + signName);

            Log.d("T","pubKey:" + pubKey);

            Log.d("T","signNumber:" + signNumber);

            Log.d("T","subjectDN:"+subjectDN);

        } catch (CertificateException e) {

            e.printStackTrace();

        }

    }

    //==================

    public String showUninstallAPKSignatures() {

        String apkPath="com.jtys114.ddl";

        String PATH_PackageParser = "android.content.pm.PackageParser";

        try {

            // apk包的文件路径

            // 这是一个Package 解释器, 是隐藏的

            // 构造函数的参数只有一个, apk文件的路径

            // PackageParser packageParser = new PackageParser(apkPath);

            Class pkgParserCls = Class.forName(PATH_PackageParser);

            Class[] typeArgs = new Class[];

            typeArgs[] = String.class;

            Constructor pkgParserCt = pkgParserCls.getConstructor(typeArgs);

            Object[] valueArgs = new Object[];

            valueArgs[] = apkPath;

            Object pkgParser = pkgParserCt.newInstance(valueArgs);

            // 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况

            DisplayMetrics metrics = new DisplayMetrics();

            metrics.setToDefaults();

            // PackageParser.Package mPkgInfo = packageParser.parsePackage(new

            // File(apkPath), apkPath,

            // metrics, 0);

            typeArgs = new Class[];

            typeArgs[] = File.class;

            typeArgs[] = String.class;

            typeArgs[] = DisplayMetrics.class;

            typeArgs[] = Integer.TYPE;

            Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod("parsePackage",

                    typeArgs);

            valueArgs = new Object[];

            valueArgs[] = new File(apkPath);

            valueArgs[] = apkPath;

            valueArgs[] = metrics;

            valueArgs[] = PackageManager.GET_SIGNATURES;

            Object pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs);

            typeArgs = new Class[];

            typeArgs[] = pkgParserPkg.getClass();

            typeArgs[] = Integer.TYPE;

            Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates",

                    typeArgs);

            valueArgs = new Object[];

            valueArgs[] = pkgParserPkg;

            valueArgs[] = PackageManager.GET_SIGNATURES;

            pkgParser_collectCertificatesMtd.invoke(pkgParser, valueArgs);

            // 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开

            Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField("mSignatures");

            Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg);

            String r= info[].toCharsString();

            return r;

        } catch (Exception e) {

            e.printStackTrace();

        }

        return null;

    }