获取apk文件的签名信息（未安装， 只是一个apk文件），apk签名, /**

获取apk文件的签名信息（未安装， 只是一个apk文件），apk签名, /**

    /**      * get signature of an apk file      * this method will execute quit a long time, so it is suitable to call it in sub thread      * @param context      * @param apkFilePath      * @return signature , null if there is no signature , or apkFilePath is wrong      */      public static String getSignatureOfApk(Context context, String apkFilePath){          Log.i(TAG, "SignatureUtils.getSignatureOfApk");          if (TextUtils.isEmpty(apkFilePath)) return null;          PackageManager pm = context.getPackageManager();          PackageInfo pi = pm.getPackageArchiveInfo(apkFilePath, PackageManager.GET_SIGNATURES);          Signature[] signatures = pi.signatures;          if(signatures != null && signatures.length > 0){              String signature =  signatures[0].toCharsString();              Log.i(TAG, "Signature of " + apkFilePath + " is : " + signature);              return  signature;          }          return null;      }