try {

                /** 通过包管理器获得指定包名包含签名的包信息 **/

                PackageInfo packageInfo = getPackageManager().getPackageInfo(

                        pkgname, PackageManager.GET_SIGNATURES);

                /******* 通过返回的包信息获得签名数组 *******/

                Signature[] signatures = packageInfo.signatures;

                StringBuilder builder = new StringBuilder();

                /******* 循环遍历签名数组拼接应用签名 *******/

                for (Signature signature : signatures) {

                    builder.append(signature.toCharsString());

                }

                /************** 得到应用签名 **************/

                String signature = builder.toString();

                Logger.d("tag", "getSignature:" + signature);

            } catch (NameNotFoundException e) {