diff --git a/README-cn.md b/README-cn.md
index 7d6ba70..2b151f5 100644
--- a/README-cn.md
+++ b/README-cn.md
@@ -13,7 +13,7 @@
 ## Gradle
 
 ```groovy
-compile('com.jayfeng:lesscode-core:2.1')
+implementation 'com.jayfeng:lesscode-core:2.4.2'
 ```
 
 ## Features
diff --git a/README.md b/README.md
index 245fbf2..c5f87c8 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ less code, more efficient for android, for the best android tools library!
 ## Gradle
 
 ```groovy
-compile('com.jayfeng:lesscode-core:2.1')
+implementation 'com.jayfeng:lesscode-core:2.4.2'
 ```
 
 ## Features
diff --git a/app/build.gradle b/app/build.gradle
index ec60648..3384bef 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -1,13 +1,13 @@
 apply plugin: 'com.android.application'
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 27
+    buildToolsVersion '27.0.3'
 
     defaultConfig {
         applicationId "com.jayfeng.lesscode.app"
-        minSdkVersion 9
-        targetSdkVersion 25
+        minSdkVersion 14
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }
diff --git a/build.gradle b/build.gradle
index 47804e3..9987d03 100644
--- a/build.gradle
+++ b/build.gradle
@@ -3,9 +3,10 @@
 buildscript {
     repositories {
         jcenter()
+        google()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:2.2.3'
+        classpath 'com.android.tools.build:gradle:3.0.1'
         classpath 'com.jfrog.bintray.gradle:gradle-bintray-plugin:1.7.1'
         classpath 'com.github.dcendents:android-maven-gradle-plugin:1.5'
         // NOTE: Do not place your application dependencies here; they belong
@@ -16,5 +17,6 @@ buildscript {
 allprojects {
     repositories {
         jcenter()
+        google()
     }
 }
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index 0e65f82..cb24766 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
-#Wed Aug 24 08:51:21 CST 2016
+#Wed Mar 28 16:07:08 CST 2018
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.14.1-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip
diff --git a/lesscode-core/build.gradle b/lesscode-core/build.gradle
index 95db3bb..55d9bb4 100644
--- a/lesscode-core/build.gradle
+++ b/lesscode-core/build.gradle
@@ -2,15 +2,15 @@ apply plugin: 'com.android.library'
 apply plugin: 'com.github.dcendents.android-maven'
 apply plugin: 'com.jfrog.bintray'
 
-version = "2.1"                                                              // #CONFIG# // project version
+version = "2.4.2"                                                              // #CONFIG# // project version
 
 android {
-    compileSdkVersion 25
-    buildToolsVersion "25.0.2"
+    compileSdkVersion 27
+    buildToolsVersion "27.0.2"
     // resourcePrefix "less_"                                                  // #CONFIG# // please remove this if you don't known it
     defaultConfig {
-        minSdkVersion 9
-        targetSdkVersion 25
+        minSdkVersion 14
+        targetSdkVersion 27
         versionCode 1
         versionName "1.0"
     }
@@ -28,8 +28,8 @@ android {
 
 dependencies {
     compile fileTree(dir: 'libs', include: ['*.jar'])
-    compile 'com.android.support:support-v4:25.1.1'
-    compile 'com.android.support:recyclerview-v7:25.1.1'
+    compile 'com.android.support:support-v4:27.0.2'
+    compile 'com.android.support:recyclerview-v7:27.0.2'
 }
 
 def siteUrl = 'https://github.com/openproject/LessCode'                        // #CONFIG# // project homepage
diff --git a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/ApplicationLess.java b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/ApplicationLess.java
index 7c13710..4a521bb 100644
--- a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/ApplicationLess.java
+++ b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/ApplicationLess.java
@@ -14,7 +14,7 @@ public final class ApplicationLess {
      * @param context
      * @return
      */
-    private static boolean $init(Context context) {
+    public static boolean $init(Context context) {
         ActivityManager am = ((ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE));
         List<ActivityManager.RunningAppProcessInfo> processInfos = am.getRunningAppProcesses();
         String mainProcessName = context.getPackageName();
diff --git a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/NetworkLess.java b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/NetworkLess.java
index 7024c49..c532f5a 100644
--- a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/NetworkLess.java
+++ b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/NetworkLess.java
@@ -60,6 +60,7 @@ public static enum NetworkType {
         if (type == ConnectivityManager.TYPE_MOBILE) {
             switch (subType) {
                 case TelephonyManager.NETWORK_TYPE_GPRS:
+                case TelephonyManager.NETWORK_TYPE_GSM:
                 case TelephonyManager.NETWORK_TYPE_EDGE:
                 case TelephonyManager.NETWORK_TYPE_CDMA:
                 case TelephonyManager.NETWORK_TYPE_1xRTT:
@@ -75,10 +76,15 @@ public static enum NetworkType {
                 case TelephonyManager.NETWORK_TYPE_EVDO_B:
                 case TelephonyManager.NETWORK_TYPE_EHRPD:
                 case TelephonyManager.NETWORK_TYPE_HSPAP:
+                case TelephonyManager.NETWORK_TYPE_TD_SCDMA:
                     return NetworkType.MOBILE_MIDDLE;// 3G
 
                 case TelephonyManager.NETWORK_TYPE_LTE:
+                case TelephonyManager.NETWORK_TYPE_IWLAN:
+                case 19: // TelephonyManager.NETWORK_TYPE_LTE_CA
                     return NetworkType.MOBILE_FAST; // 4G
+                default: // we think the network will be more and more better
+                    return NetworkType.MOBILE_FAST;
             }
         }
 
diff --git a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/StorageLess.java b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/StorageLess.java
index 8b046e9..d881dc2 100644
--- a/lesscode-core/src/main/java/com/jayfeng/lesscode/core/StorageLess.java
+++ b/lesscode-core/src/main/java/com/jayfeng/lesscode/core/StorageLess.java
@@ -186,17 +186,29 @@ public static class ExtSdcard {
     }
 
     private static long total(File path) {
-        StatFs stat = new StatFs(path.getPath());
-        long blockSize = stat.getBlockSize();
-        long totalBlocks = stat.getBlockCount();
-        return blockSize * totalBlocks;
+        try {
+            StatFs stat = new StatFs(path.getPath());
+            long blockSize = stat.getBlockSize();
+            long totalBlocks = stat.getBlockCount();
+            return blockSize * totalBlocks;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return 0;
     }
 
     private static long free(File path) {
-        StatFs stat = new StatFs(path.getPath());
-        long blockSize = stat.getBlockSize();
-        long freeBlocks = stat.getAvailableBlocks();
-        return blockSize * freeBlocks;
+        try {
+            StatFs stat = new StatFs(path.getPath());
+            long blockSize = stat.getBlockSize();
+            long freeBlocks = stat.getAvailableBlocks();
+            return blockSize * freeBlocks;
+        } catch (Exception e) {
+            e.printStackTrace();
+        }
+
+        return 0;
     }
 
     private static long used(File path) {