public class Common{

         /**

      * 获取版本号

      *

      * @return 当前应用的版本号

      */

     public static String getVersion(Context context) {

         try {

             PackageManager manager = context.getPackageManager();

             PackageInfo info = manager.getPackageInfo(context.getPackageName(),

                     0);

             String version = info.versionName;

             return version;

         } catch (Exception e) {

             e.printStackTrace();

             return "";

         }

     }

        /**

      * 版本号比较

      *

      * @param version1

      * @param version2

      * @return

      */

     public static int compareVersion(String version1, String version2) {

         if (version1.equals(version2)) {

             return 0;

         }

         String[] version1Array = version1.split("\\.");

         String[] version2Array = version2.split("\\.");

         int index = 0;

         // 获取最小长度值

         int minLen = Math.min(version1Array.length, version2Array.length);

         int diff = 0;

         // 循环判断每位的大小

         Log.d("HomePageActivity", "verTag2=2222="+version1Array[index]);

         while (index < minLen

                 && (diff = Integer.parseInt(version1Array[index])

                 - Integer.parseInt(version2Array[index])) == 0) {

             index++;

         }

         if (diff == 0) {

             // 如果位数不一致，比较多余位数

             for (int i = index; i < version1Array.length; i++) {

                 if (Integer.parseInt(version1Array[i]) > 0) {

                     return 1;

                 }

             }

             for (int i = index; i < version2Array.length; i++) {

                 if (Integer.parseInt(version2Array[i]) > 0) {

                     return -1;

                 }

             }

             return 0;

         } else {

             return diff > 0 ? 1 : -1;

         }

     }

 }