1 // 比较版本号  2     public static int compareVersion(String newVersion, String currentVersion) { 3         if (TextUtils.isEmpty(newVersion)) { 4             if (TextUtils.isEmpty(currentVersion)) { 5                 return 0; 6             } else { 7                 return -1; 8             } 9         } else if (TextUtils.isEmpty(currentVersion)) {10             return 1;11         }12 13         String[] first = newVersion.split("\\.");14         String[] second = currentVersion.split("\\.");15         Log.d(TAG, "first: " + Arrays.asList(first) + ", second: " + Arrays.asList(second));16 17         int count = Math.min(first.length, second.length);18         for (int i = 0; i < count; i++) {19             try {20                 int firstVersionNumber = Integer.parseInt(first[i]);21                 int secondVersionNumber = Integer.parseInt(second[i]);22 23                 if (firstVersionNumber < secondVersionNumber) {24                     return -1;25                 } else if (firstVersionNumber > secondVersionNumber) {26                     return 1;27                 }28 29             } catch (Exception ignored) {30             }31         }32 33         if (first.length < second.length) {34             return -1;35         } else if (first.length > second.length) {36             return 1;37         }38 39         return 0;40     }