diff --git a/.idea/libraries/Dart_Packages.xml b/.idea/libraries/Dart_Packages.xml
index c020943..efc881b 100644
--- a/.idea/libraries/Dart_Packages.xml
+++ b/.idea/libraries/Dart_Packages.xml
@@ -1,417 +1,13 @@
 <component name="libraryTable">
-  <library name="Dart Packages" type="DartPackagesLibraryType">
-    <properties>
-      <option name="packageNameToDirsMap">
-        <entry key="analyzer">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/analyzer-0.32.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="args">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/args-1.5.0/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="async">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/async-2.0.8/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="boolean_selector">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/boolean_selector-1.0.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="charcode">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/charcode-1.1.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="collection">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/collection-1.14.11/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="common_utils">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/common_utils-1.0.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="convert">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/convert-2.0.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="crypto">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/crypto-2.0.6/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="csslib">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/csslib-0.14.5/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="cupertino_icons">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/cupertino_icons-0.1.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="flutter">
-          <value>
-            <list>
-              <option value="D:/flutter/packages/flutter/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="flutter_screenutil">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/git/flutter_screenUtil-62d8b7d3a3cc4323eca1682166d7aee2890b1468/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="flutter_test">
-          <value>
-            <list>
-              <option value="D:/flutter/packages/flutter_test/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="front_end">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/front_end-0.1.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="glob">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/glob-1.1.7/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="html">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/html-0.13.3+3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="http">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/http-0.11.3+17/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="http_multi_server">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/http_multi_server-2.0.5/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="http_parser">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/http_parser-3.1.3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="io">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/io-0.3.3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="js">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/js-0.6.1+1/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="json_rpc_2">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/json_rpc_2-2.0.9/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="kernel">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/kernel-0.3.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="logging">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/logging-0.11.3+2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="matcher">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/matcher-0.12.3+1/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="meta">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/meta-1.1.6/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="mime">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/mime-0.9.6+2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="multi_server_socket">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/multi_server_socket-1.0.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="node_preamble">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/node_preamble-1.4.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="package_config">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/package_config-1.0.5/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="package_resolver">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/package_resolver-1.0.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="path">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/path-1.6.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="plugin">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/plugin-0.2.0+3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="pool">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/pool-1.3.6/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="pub_semver">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/pub_semver-1.4.2/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="quiver">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/quiver-2.0.0+1/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="shelf">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/shelf-0.7.3+3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="shelf_packages_handler">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/shelf_packages_handler-1.0.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="shelf_static">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/shelf_static-0.2.8/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="shelf_web_socket">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/shelf_web_socket-0.2.2+4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="sky_engine">
-          <value>
-            <list>
-              <option value="D:/flutter/bin/cache/pkg/sky_engine/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="source_map_stack_trace">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/source_map_stack_trace-1.1.5/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="source_maps">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/source_maps-0.10.7/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="source_span">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/source_span-1.4.1/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="stack_trace">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/stack_trace-1.9.3/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="stream_channel">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/stream_channel-1.6.8/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="string_scanner">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/string_scanner-1.0.4/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="term_glyph">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/term_glyph-1.0.1/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="test">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/test-1.3.0/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="typed_data">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/typed_data-1.1.6/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="utf">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/utf-0.9.0+5/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="vector_math">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/vector_math-2.0.8/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="vm_service_client">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/vm_service_client-0.2.6/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="watcher">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/watcher-0.9.7+10/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="web_socket_channel">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/web_socket_channel-1.0.9/lib" />
-            </list>
-          </value>
-        </entry>
-        <entry key="yaml">
-          <value>
-            <list>
-              <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/yaml-2.1.15/lib" />
-            </list>
-          </value>
-        </entry>
-      </option>
-    </properties>
+  <library name="Dart Packages">
     <CLASSES>
-      <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/git/flutter_screenUtil-62d8b7d3a3cc4323eca1682166d7aee2890b1468/lib" />
+      <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/git/flutter_screenutil-d3a81e8015a4ac3281cd4e335a5c54e91183e743/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/analyzer-0.32.4/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/args-1.5.0/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/async-2.0.8/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/boolean_selector-1.0.4/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/charcode-1.1.2/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/collection-1.14.11/lib" />
-      <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/common_utils-1.0.2/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/convert-2.0.2/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/crypto-2.0.6/lib" />
       <root url="file://$USER_HOME$/AppData/Roaming/Pub/Cache/hosted/pub.flutter-io.cn/csslib-0.14.5/lib" />
diff --git a/.idea/libraries/Flutter_Plugins.xml b/.idea/libraries/Flutter_Plugins.xml
index b0f6971..3179973 100644
--- a/.idea/libraries/Flutter_Plugins.xml
+++ b/.idea/libraries/Flutter_Plugins.xml
@@ -1,5 +1,5 @@
 <component name="libraryTable">
-  <library name="Flutter Plugins" type="FlutterPluginsLibraryType">
+  <library name="Flutter Plugins">
     <CLASSES />
     <JAVADOC />
     <SOURCES />
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
index 2af49cf..20bf3e0 100644
--- a/.idea/workspace.xml
+++ b/.idea/workspace.xml
@@ -1,12 +1,23 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="CMakeSettings">
+    <configurations>
+      <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
+    </configurations>
+  </component>
   <component name="ChangeListManager">
     <list default="true" id="4b1e7c8a-90e5-4705-b34f-bcaa595e12fe" name="Default" comment="修改release无效的bug">
-      <change beforePath="" afterPath="$PROJECT_DIR$/example/lib/flutter_screenutil.dart" />
-      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" afterPath="$PROJECT_DIR$/.idea/workspace.xml" />
-      <change beforePath="$PROJECT_DIR$/.packages" afterPath="$PROJECT_DIR$/.packages" />
-      <change beforePath="$PROJECT_DIR$/example/pubspec.lock" afterPath="$PROJECT_DIR$/example/pubspec.lock" />
-      <change beforePath="$PROJECT_DIR$/pubspec.yaml" afterPath="$PROJECT_DIR$/pubspec.yaml" />
+      <change afterPath="$PROJECT_DIR$/README-EN.md" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/effect.png" afterDir="false" />
+      <change afterPath="$PROJECT_DIR$/example/lib/flutter_screenutil.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/libraries/Dart_Packages.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/libraries/Dart_Packages.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/libraries/Flutter_Plugins.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/libraries/Flutter_Plugins.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/.idea/libraries/Dart_SDK.xml" beforeDir="false" afterPath="$PROJECT_DIR$/example/.idea/libraries/Dart_SDK.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/.idea/libraries/Flutter_for_Android.xml" beforeDir="false" afterPath="$PROJECT_DIR$/example/.idea/libraries/Flutter_for_Android.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/example/.idea/workspace.xml" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/example/lib/main.dart" beforeDir="false" afterPath="$PROJECT_DIR$/example/lib/main.dart" afterDir="false" />
+      <change beforePath="$PROJECT_DIR$/pubspec.yaml" beforeDir="false" afterPath="$PROJECT_DIR$/pubspec.yaml" afterDir="false" />
     </list>
     <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
     <option name="TRACKING_ENABLED" value="true" />
@@ -21,10 +32,7 @@
         <entry file="file://$PROJECT_DIR$/lib/flutter_screenutil.dart">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="1809">
-              <caret line="70" column="26" lean-forward="false" selection-start-line="70" selection-start-column="26" selection-end-line="70" selection-end-column="26" />
-              <folding>
-                <element signature="e#0#1813#0" expanded="true" />
-              </folding>
+              <caret line="70" column="26" selection-start-line="70" selection-start-column="26" selection-end-line="70" selection-end-column="26" />
             </state>
           </provider>
         </entry>
@@ -32,31 +40,35 @@
       <file leaf-file-name="main.dart" pinned="false" current-in-tab="false">
         <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="1107">
-              <caret line="41" column="47" lean-forward="false" selection-start-line="41" selection-start-column="47" selection-end-line="41" selection-end-column="47" />
-              <folding>
-                <element signature="e#0#39#0" expanded="true" />
-              </folding>
+            <state relative-caret-position="130">
+              <caret line="52" selection-start-line="52" selection-end-line="52" />
             </state>
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
-        <entry file="file://$PROJECT_DIR$/README.md">
+      <file leaf-file-name="flutter_screenutil.dart" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/example/lib/flutter_screenutil.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="488">
-              <caret line="120" column="6" lean-forward="false" selection-start-line="120" selection-start-column="6" selection-end-line="120" selection-end-column="6" />
-              <folding />
+            <state relative-caret-position="54">
+              <caret line="5" column="39" selection-start-line="5" selection-start-column="39" selection-end-line="5" selection-end-column="39" />
             </state>
           </provider>
         </entry>
       </file>
-      <file leaf-file-name="pubspec.yaml" pinned="false" current-in-tab="true">
-        <entry file="file://$PROJECT_DIR$/pubspec.yaml">
+      <file leaf-file-name="README-EN.md" pinned="false" current-in-tab="true">
+        <entry file="file://$PROJECT_DIR$/README-EN.md">
+          <provider selected="true" editor-type-id="text-editor">
+            <state relative-caret-position="332">
+              <caret line="131" lean-forward="true" selection-start-line="131" selection-end-line="131" />
+            </state>
+          </provider>
+        </entry>
+      </file>
+      <file leaf-file-name="README.md" pinned="false" current-in-tab="false">
+        <entry file="file://$PROJECT_DIR$/README.md">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="108">
-              <caret line="4" column="58" lean-forward="true" selection-start-line="4" selection-start-column="58" selection-end-line="4" selection-end-column="58" />
-              <folding />
+            <state relative-caret-position="3240">
+              <caret line="120" column="6" selection-start-line="120" selection-start-column="6" selection-end-line="120" selection-end-column="6" />
             </state>
           </provider>
         </entry>
@@ -65,8 +77,7 @@
         <entry file="file://$PROJECT_DIR$/example/pubspec.yaml">
           <provider selected="true" editor-type-id="text-editor">
             <state relative-caret-position="432">
-              <caret line="16" column="16" lean-forward="false" selection-start-line="16" selection-start-column="16" selection-end-line="16" selection-end-column="16" />
-              <folding />
+              <caret line="16" column="16" selection-start-line="16" selection-start-column="16" selection-end-line="16" selection-end-column="16" />
             </state>
           </provider>
         </entry>
@@ -83,6 +94,7 @@
       <find>scaleWidth</find>
       <find>instance</find>
       <find>ScreenUtil.getInstance()</find>
+      <find>`</find>
     </findStrings>
     <replaceStrings>
       <replace>ScreenUtil()</replace>
@@ -91,11 +103,6 @@
   <component name="Git.Settings">
     <option name="RECENT_GIT_ROOT_PATH" value="$PROJECT_DIR$" />
   </component>
-  <component name="GradleLocalSettings">
-    <option name="externalProjectsViewState">
-      <projects_view />
-    </option>
-  </component>
   <component name="IdeDocumentHistory">
     <option name="CHANGED_PATHS">
       <list>
@@ -103,9 +110,10 @@
         <option value="$PROJECT_DIR$/example/lib/flutter_screenutil.dart" />
         <option value="$USER_HOME$/AppData/Roaming/Pub/Cache/git/flutter_screenUtil-62d8b7d3a3cc4323eca1682166d7aee2890b1468/lib/flutter_screenutil.dart" />
         <option value="$PROJECT_DIR$/lib/flutter_screenutil.dart" />
-        <option value="$PROJECT_DIR$/example/lib/main.dart" />
         <option value="$PROJECT_DIR$/README.md" />
         <option value="$PROJECT_DIR$/pubspec.yaml" />
+        <option value="$PROJECT_DIR$/example/lib/main.dart" />
+        <option value="$PROJECT_DIR$/README-EN.md" />
       </list>
     </option>
   </component>
@@ -119,22 +127,11 @@
   </component>
   <component name="ProjectView">
     <navigator currentView="ProjectPane" proportions="" version="1">
-      <flattenPackages />
-      <showMembers />
-      <showModules />
-      <showLibraryContents />
-      <hideEmptyPackages />
-      <abbreviatePackageNames />
-      <autoscrollToSource />
-      <autoscrollFromSource />
-      <sortByType />
-      <manualOrder />
       <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
-      <pane id="PackagesPane" />
       <pane id="Scope" />
-      <pane id="Scratches" />
+      <pane id="AndroidView" />
       <pane id="ProjectPane">
         <subPane>
           <expand>
@@ -142,6 +139,17 @@
               <item name="flutter_ScreenUtil" type="b2602c69:ProjectViewProjectNode" />
               <item name="flutter_ScreenUtil" type="462c0819:PsiDirectoryNode" />
             </path>
+            <path>
+              <item name="flutter_ScreenUtil" type="b2602c69:ProjectViewProjectNode" />
+              <item name="flutter_ScreenUtil" type="462c0819:PsiDirectoryNode" />
+              <item name="example" type="462c0819:PsiDirectoryNode" />
+            </path>
+            <path>
+              <item name="flutter_ScreenUtil" type="b2602c69:ProjectViewProjectNode" />
+              <item name="flutter_ScreenUtil" type="462c0819:PsiDirectoryNode" />
+              <item name="example" type="462c0819:PsiDirectoryNode" />
+              <item name="lib" type="462c0819:PsiDirectoryNode" />
+            </path>
             <path>
               <item name="flutter_ScreenUtil" type="b2602c69:ProjectViewProjectNode" />
               <item name="flutter_ScreenUtil" type="462c0819:PsiDirectoryNode" />
@@ -151,21 +159,22 @@
           <select />
         </subPane>
       </pane>
-      <pane id="AndroidView" />
+      <pane id="PackagesPane" />
     </panes>
   </component>
   <component name="PropertiesComponent">
-    <property name="settings.editor.selected.configurable" value="android.sdk-updates" />
     <property name="android.project.structure.last.selected" value="SDK Location" />
     <property name="android.project.structure.proportion" value="0.15" />
     <property name="android.sdk.path" value="D:/Android/sdk" />
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
-    <property name="show.migrate.to.gradle.popup" value="false" />
     <property name="dart.analysis.tool.window.force.activate" value="false" />
     <property name="io.flutter.reload.alreadyRun" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$/example" />
+    <property name="settings.editor.selected.configurable" value="android.sdk-updates" />
+    <property name="show.migrate.to.gradle.popup" value="false" />
   </component>
   <component name="RecentsManager">
     <key name="CopyFile.RECENT_KEYS">
+      <recent name="D:\Project\flutter_ScreenUtil" />
       <recent name="D:\Project\flutter_ScreenUtil\example\lib" />
       <recent name="F:\screenutil" />
     </key>
@@ -184,32 +193,12 @@
   </component>
   <component name="RunManager">
     <configuration default="true" type="Application" factoryName="Application">
-      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-      <option name="MAIN_CLASS_NAME" />
-      <option name="VM_PARAMETERS" />
-      <option name="PROGRAM_PARAMETERS" />
       <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
-      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-      <option name="ALTERNATIVE_JRE_PATH" />
-      <option name="ENABLE_SWING_INSPECTOR" value="false" />
-      <option name="ENV_VARIABLES" />
-      <option name="PASS_PARENT_ENVS" value="true" />
-      <module name="" />
-      <envs />
     </configuration>
     <configuration name="main.dart" type="FlutterRunConfigurationType" factoryName="Flutter" temporary="true" nameIsGenerated="true">
       <option name="filePath" value="$PROJECT_DIR$/example/lib/main.dart" />
     </configuration>
-    <configuration default="true" type="Remote" factoryName="Remote">
-      <option name="USE_SOCKET_TRANSPORT" value="true" />
-      <option name="SERVER_MODE" value="false" />
-      <option name="SHMEM_ADDRESS" value="javadebug" />
-      <option name="HOST" value="localhost" />
-      <option name="PORT" value="5005" />
-    </configuration>
     <configuration default="true" type="TestNG" factoryName="TestNG">
-      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-      <module name="" />
       <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
       <option name="ALTERNATIVE_JRE_PATH" />
       <option name="SUITE_NAME" />
@@ -222,15 +211,12 @@
       <option name="PARAMETERS" />
       <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
       <option name="OUTPUT_DIRECTORY" />
-      <option name="ANNOTATION_TYPE" />
-      <option name="ENV_VARIABLES" />
       <option name="PASS_PARENT_ENVS" value="true" />
       <option name="TEST_SEARCH_SCOPE">
         <value defaultName="singleModule" />
       </option>
       <option name="USE_DEFAULT_REPORTERS" value="false" />
       <option name="PROPERTIES_FILE" />
-      <envs />
       <properties />
       <listeners />
     </configuration>
@@ -268,14 +254,11 @@
       <option name="VM_PARAMETERS" value="-Xmx512m -Xms256m -XX:MaxPermSize=250m -ea" />
     </configuration>
     <recent_temporary>
-      <list size="1">
-        <item index="0" class="java.lang.String" itemvalue="Flutter.main.dart" />
+      <list>
+        <item itemvalue="Flutter.main.dart" />
       </list>
     </recent_temporary>
   </component>
-  <component name="ShelveChangesManager" show_recycled="false">
-    <option name="remove_strategy" value="false" />
-  </component>
   <component name="SvnConfiguration">
     <configuration />
   </component>
@@ -343,45 +326,52 @@
       <option name="project" value="LOCAL" />
       <updated>1538207747808</updated>
     </task>
-    <option name="localTasksCounter" value="9" />
+    <task id="LOCAL-00009" summary="修改版本号">
+      <created>1538207933997</created>
+      <option name="number" value="00009" />
+      <option name="presentableId" value="LOCAL-00009" />
+      <option name="project" value="LOCAL" />
+      <updated>1538207933997</updated>
+    </task>
+    <option name="localTasksCounter" value="10" />
     <servers />
   </component>
   <component name="ToolWindowManager">
     <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
     <editor active="true" />
     <layout>
-      <window_info id="TODO" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="6" side_tool="false" content_ui="tabs" />
-      <window_info id="Messages" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.3297062" sideWeight="0.49573562" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Palette&#9;" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Image Layers" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Capture Analysis" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Event Log" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3297062" sideWeight="0.5042644" order="8" side_tool="true" content_ui="tabs" />
-      <window_info id="Dart Analysis" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3297062" sideWeight="0.5" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Run" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3297062" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
-      <window_info id="Version Control" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.32861805" sideWeight="0.5" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Terminal" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.3297062" sideWeight="0.49573562" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Flutter Outline" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Capture Tool" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Designer" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
-      <window_info id="Structure" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-      <window_info id="Fabric" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Theme Preview" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Debug" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="3" side_tool="false" content_ui="tabs" />
-      <window_info id="Favorites" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="true" content_ui="tabs" />
-      <window_info id="Flutter Inspector" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Cvs" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="4" side_tool="false" content_ui="tabs" />
-      <window_info id="Android Profiler" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="false" weight="0.33" sideWeight="0.5" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Message" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
-      <window_info id="Commander" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="0" side_tool="false" content_ui="tabs" />
-      <window_info id="Build Variants" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="3" side_tool="true" content_ui="tabs" />
-      <window_info id="Logcat" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="8" side_tool="false" content_ui="tabs" />
-      <window_info id="Hierarchy" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="combo" />
-      <window_info id="Ant Build" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
-      <window_info id="Device File Explorer" active="false" anchor="right" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="4" side_tool="true" content_ui="tabs" />
-      <window_info id="Inspection" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.4" sideWeight="0.5" order="5" side_tool="false" content_ui="tabs" />
-      <window_info id="Captures" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="2" side_tool="false" content_ui="tabs" />
-      <window_info id="Find" active="false" anchor="bottom" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="false" show_stripe_button="true" weight="0.33" sideWeight="0.5" order="1" side_tool="false" content_ui="tabs" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="right" id="Palette&#9;" order="4" />
+      <window_info id="Image Layers" order="3" />
+      <window_info anchor="right" id="Capture Analysis" order="4" />
+      <window_info anchor="bottom" id="Event Log" order="8" sideWeight="0.5042644" side_tool="true" weight="0.3297062" />
+      <window_info anchor="bottom" id="Dart Analysis" order="8" weight="0.3297062" />
+      <window_info anchor="bottom" id="Run" order="2" visible="true" weight="0.3293348" />
+      <window_info anchor="bottom" id="Version Control" order="8" weight="0.32861805" />
+      <window_info anchor="bottom" id="Terminal" order="8" sideWeight="0.49573562" weight="0.3297062" />
+      <window_info anchor="right" id="Flutter Outline" order="4" />
+      <window_info id="Capture Tool" order="3" />
+      <window_info id="Designer" order="3" />
+      <window_info active="true" content_ui="combo" id="Project" order="0" visible="true" weight="0.25" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info anchor="right" id="Fabric" order="4" />
+      <window_info anchor="right" id="Theme Preview" order="4" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info id="Favorites" order="3" side_tool="true" />
+      <window_info anchor="right" id="Flutter Inspector" order="4" />
+      <window_info anchor="right" id="Commander" order="0" weight="0.4" />
+      <window_info id="Captures" order="2" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info id="Build Variants" order="3" side_tool="true" />
+      <window_info anchor="bottom" id="Android Profiler" order="8" show_stripe_button="false" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="bottom" id="Logcat" order="8" />
+      <window_info anchor="bottom" id="Messages" order="8" sideWeight="0.49573562" visible="true" weight="0.3297062" />
+      <window_info anchor="bottom" id="Message" order="0" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info anchor="right" id="Device File Explorer" order="4" side_tool="true" />
     </layout>
   </component>
   <component name="UnknownFeatures">
@@ -394,40 +384,138 @@
     <MESSAGE value="添加示例" />
     <MESSAGE value="优化示例代码" />
     <MESSAGE value="修改release无效的bug" />
-    <option name="LAST_COMMIT_MESSAGE" value="修改release无效的bug" />
+    <MESSAGE value="修改版本号" />
+    <option name="LAST_COMMIT_MESSAGE" value="修改版本号" />
   </component>
   <component name="XDebuggerManager">
     <breakpoint-manager>
       <option name="time" value="1" />
     </breakpoint-manager>
-    <watches-manager />
   </component>
   <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/README-EN.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="2457">
+          <caret line="91" column="29" selection-start-line="91" selection-start-column="29" selection-end-line="91" selection-end-column="29" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3240">
+          <caret line="120" column="6" selection-start-line="120" selection-start-column="6" selection-end-line="120" selection-end-column="6" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/example/pubspec.yaml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="432">
+          <caret line="16" column="16" selection-start-line="16" selection-start-column="16" selection-end-line="16" selection-end-column="16" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/example/lib/main.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="189">
+          <caret line="8" column="38" lean-forward="true" selection-start-line="8" selection-start-column="38" selection-end-line="8" selection-end-column="38" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/lib/flutter_screenutil.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="1890">
+          <caret line="70" column="26" selection-start-line="70" selection-start-column="26" selection-end-line="70" selection-end-column="26" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/example/lib/flutter_screenutil.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="135">
+          <caret line="5" column="39" lean-forward="true" selection-start-line="5" selection-start-column="39" selection-end-line="5" selection-end-column="39" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/README-EN.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="2457">
+          <caret line="91" column="29" lean-forward="true" selection-start-line="91" selection-start-column="29" selection-end-line="91" selection-end-column="29" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/README.md">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="3240">
+          <caret line="120" column="6" selection-start-line="120" selection-start-column="6" selection-end-line="120" selection-end-column="6" />
+        </state>
+      </provider>
+    </entry>
+    <entry file="file://$PROJECT_DIR$/example/pubspec.yaml">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="432">
+          <caret line="16" column="16" selection-start-line="16" selection-start-column="16" selection-end-line="16" selection-end-column="16" />
+        </state>
+      </provider>
+    </entry>
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diff --git a/README-EN.md b/README-EN.md
new file mode 100644
index 0000000..51939a5
--- /dev/null
+++ b/README-EN.md
@@ -0,0 +1,134 @@
+
+# flutter_ScreenUtil
+**flutter Screen adaptation scheme**
+
+github: https://github.com/OpenFlutter/flutter_ScreenUtil </br>
+csdn博客工具介绍:https://blog.csdn.net/u011272795/article/details/82795477
+
+
+## Usege:
+
+### Add dependency：
+```
+dependencies:
+  flutter:
+    sdk: flutter
+  # add flutter_ScreenUtil
+  flutter_screenutil:
+    git:
+      url: git://github.com/openflutter/flutter_screenutil
+```
+
+### Add the following imports to your Dart code:
+```
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+```
+
+### Initialize the setup size
+Please set the width and height of the design draft before use, the width and height of the design draft (unit px).
+If not set, the default size is used. The default is 1080*1920.
+Be sure to set the page in the MaterialApp's home to ensure that the fit size is set before each use:
+
+```
+//Set the fit size (fill in the screen size of the device in the design)
+//If the design is based on the size of the iPhone6 ​​(iPhone6 ​​750*1334)
+ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context);
+```
+
+### Use：
+
+Fit size：
+```
+Pass the px size of the design draft：
+
+Width after adaptation: ScreenUtil().setWidth(540),
+Height after adaptation: ScreenUtil().setHeight(200),
+
+//for example:
+Container(
+           width: ScreenUtil().setWidth(375),
+           height: ScreenUtil().setHeight(200),
+           ...
+            ),
+```
+
+Other related apis：
+```
+    ScreenUtil.pixelRatio       //Device pixel density
+    ScreenUtil.screenWidth      //Device width
+    ScreenUtil.screenHeight     //Device height
+    ScreenUtil.bottomBarHeight  //Bottom safe zone distance, suitable for buttons with full screen
+    ScreenUtil.statusBarHeight  //Status bar height , Notch will be higher Unit px
+
+    ScreenUtil().scaleWidth //The width is enlarged relative to the design draft
+    ScreenUtil().scaleHeight //Height relative to the magnification of the design draft
+
+```
+
+```
+//导入
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+
+...
+
+ @override
+  Widget build(BuildContext context) {
+    //Set the fit size (fill in the screen size of the device in the design) If the design is based on the size of the iPhone6 ​​(iPhone6 ​​750*1334)
+    ScreenUtil.instance = ScreenUtil(width: 750, height: 1334)..init(context);
+    print('Device width:${ScreenUtil.screenWidth}'); //Device width
+    print('Device height:${ScreenUtil.screenHeight}'); //Device height
+    print('Device pixel density:${ScreenUtil.pixelRatio}'); //Device pixel density
+    print('Bottom safe zone distance:${ScreenUtil.bottomBarHeight}'); //Bottom safe zone distance，suitable for buttons with full screen
+    print('Status bar height:${ScreenUtil.statusBarHeight}px'); //Status bar height , Notch will be higher Unit px
+    print('The width is enlarged relative to the design draft:${ScreenUtil().scaleWidth}'); //The width is enlarged relative to the design draft
+    print('Height relative to the magnification of the design draft:${ScreenUtil().scaleHeight}'); //Height relative to the magnification of the design draft
+
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text(widget.title),
+      ),
+      body: new Center(
+        child: Column(
+          children: <Widget>[
+            Row(
+              children: <Widget>[
+                Container(
+                  width: ScreenUtil().setWidth(375),
+                  height: ScreenUtil().setHeight(200),
+                  color: Colors.red,
+                  child: Text(
+                    'My width:${ScreenUtil().setWidth(375)}dp',
+                    style: TextStyle(color: Colors.white),
+                  ),
+                ),
+                Container(
+                  width: ScreenUtil().setWidth(375),
+                  height: ScreenUtil().setHeight(200),
+                  color: Colors.blue,
+                  child: Text('My width:${ScreenUtil().setWidth(375)}dp',
+                      style: TextStyle(color: Colors.white)),
+                ),
+              ],
+            ),
+            Text('Device width：${ScreenUtil.screenWidth}px'),
+            Text('Device height:${ScreenUtil.screenHeight}px'),
+            Text('Device pixel density:${ScreenUtil.pixelRatio}'),
+            Text('Bottom safe zone distance:${ScreenUtil.bottomBarHeight}px'),
+            Text('Status bar height:${ScreenUtil.statusBarHeight}px'),
+            Text('The width is enlarged relative to the design draft:${ScreenUtil().scaleWidth}'),
+            Text('Height relative to the magnification of the design draft:${ScreenUtil().scaleHeight}'),
+          ],
+        ),
+      ),
+    );
+  }
+```
+
+### example:
+
+[example demo](/example)
+ 
+effect:
+
+![效果](effect.png)
+
diff --git a/effect.png b/effect.png
new file mode 100644
index 0000000..629af73
Binary files /dev/null and b/effect.png differ
diff --git a/example/.idea/libraries/Dart_SDK.xml b/example/.idea/libraries/Dart_SDK.xml
index 70af93c..d2f6969 100644
--- a/example/.idea/libraries/Dart_SDK.xml
+++ b/example/.idea/libraries/Dart_SDK.xml
@@ -1,17 +1,17 @@
 <component name="libraryTable">
   <library name="Dart SDK">
     <CLASSES>
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/async" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/collection" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/convert" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/core" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/developer" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/html" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/io" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/isolate" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/math" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/mirrors" />
-      <root url="file://D:\flutter/bin/cache/dart-sdk/lib/typed_data" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/async" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/collection" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/convert" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/core" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/developer" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/html" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/io" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/isolate" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/math" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/mirrors" />
+      <root url="file://D:/flutter/bin/cache/dart-sdk/lib/typed_data" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
diff --git a/example/.idea/libraries/Flutter_for_Android.xml b/example/.idea/libraries/Flutter_for_Android.xml
index a102ed8..f1ddce0 100644
--- a/example/.idea/libraries/Flutter_for_Android.xml
+++ b/example/.idea/libraries/Flutter_for_Android.xml
@@ -1,9 +1,9 @@
 <component name="libraryTable">
   <library name="Flutter for Android">
     <CLASSES>
-      <root url="jar://D:\flutter/bin/cache/artifacts/engine/android-arm/flutter.jar!/" />
+      <root url="jar://D:/flutter/bin/cache/artifacts/engine/android-arm/flutter.jar!/" />
     </CLASSES>
     <JAVADOC />
     <SOURCES />
   </library>
-</component>
+</component>
\ No newline at end of file
diff --git a/example/.idea/workspace.xml b/example/.idea/workspace.xml
index 5b3388c..c58cea2 100644
--- a/example/.idea/workspace.xml
+++ b/example/.idea/workspace.xml
@@ -1,36 +1,174 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="CMakeSettings">
+    <configurations>
+      <configuration PROFILE_NAME="Debug" CONFIG_NAME="Debug" />
+    </configurations>
+  </component>
+  <component name="ChangeListManager">
+    <list default="true" id="26c93727-542e-40b3-8d87-0922eb0a34a4" name="Default" comment="" />
+    <ignored path="$PROJECT_DIR$/.dart_tool/" />
+    <ignored path="$PROJECT_DIR$/.pub/" />
+    <ignored path="$PROJECT_DIR$/build/" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="TRACKING_ENABLED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
   <component name="FileEditorManager">
-    <leaf>
+    <leaf SIDE_TABS_SIZE_LIMIT_KEY="300">
       <file leaf-file-name="main.dart" pinned="false" current-in-tab="true">
         <entry file="file://$PROJECT_DIR$/lib/main.dart">
           <provider selected="true" editor-type-id="text-editor">
-            <state relative-caret-position="0">
-              <caret line="0" column="0" lean-forward="false" selection-start-line="0" selection-start-column="0" selection-end-line="0" selection-end-column="0" />
+            <state relative-caret-position="162">
+              <caret line="6" column="49" lean-forward="true" selection-start-line="6" selection-start-column="49" selection-end-line="6" selection-end-column="49" />
             </state>
           </provider>
         </entry>
       </file>
     </leaf>
   </component>
-  <component name="ToolWindowManager">
-    <editor active="true" />
-    <layout>
-      <window_info id="Project" active="false" anchor="left" auto_hide="false" internal_type="DOCKED" type="DOCKED" visible="true" show_stripe_button="true" weight="0.25" sideWeight="0.5" order="0" side_tool="false" content_ui="combo" />
-    </layout>
+  <component name="ProjectFrameBounds" extendedState="6">
+    <option name="x" value="-8" />
+    <option name="width" value="1936" />
+    <option name="height" value="1056" />
   </component>
   <component name="ProjectView">
     <navigator currentView="ProjectPane" proportions="" version="1">
+      <foldersAlwaysOnTop value="true" />
     </navigator>
     <panes>
+      <pane id="Scope" />
       <pane id="ProjectPane">
         <option name="show-excluded-files" value="false" />
       </pane>
+      <pane id="PackagesPane" />
+      <pane id="AndroidView" />
     </panes>
   </component>
   <component name="PropertiesComponent">
-    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="dart.analysis.tool.window.force.activate" value="true" />
+    <property name="last_opened_file_path" value="$PROJECT_DIR$" />
     <property name="show.migrate.to.gradle.popup" value="false" />
   </component>
-</project>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="RunManager">
+    <configuration default="true" type="AndroidJUnit" factoryName="Android JUnit">
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="PACKAGE_NAME" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="METHOD_NAME" />
+      <option name="TEST_OBJECT" value="class" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
+      <option name="WORKING_DIRECTORY" value="$MODULE_DIR$" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="singleModule" />
+      </option>
+      <patterns />
+    </configuration>
+    <configuration default="true" type="Application" factoryName="Application">
+      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
+    </configuration>
+    <configuration default="true" type="TestNG" factoryName="TestNG">
+      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
+      <option name="ALTERNATIVE_JRE_PATH" />
+      <option name="SUITE_NAME" />
+      <option name="PACKAGE_NAME" />
+      <option name="MAIN_CLASS_NAME" />
+      <option name="METHOD_NAME" />
+      <option name="GROUP_NAME" />
+      <option name="TEST_OBJECT" value="CLASS" />
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="PARAMETERS" />
+      <option name="WORKING_DIRECTORY" value="%MODULE_WORKING_DIR%" />
+      <option name="OUTPUT_DIRECTORY" />
+      <option name="PASS_PARENT_ENVS" value="true" />
+      <option name="TEST_SEARCH_SCOPE">
+        <value defaultName="singleModule" />
+      </option>
+      <option name="USE_DEFAULT_REPORTERS" value="false" />
+      <option name="PROPERTIES_FILE" />
+      <properties />
+      <listeners />
+    </configuration>
+    <configuration name="&lt;template&gt;" type="JUnit" default="true" selected="false">
+      <option name="VM_PARAMETERS" value="-ea" />
+      <option name="WORKING_DIRECTORY" value="%MODULE_WORKING_DIR%" />
+    </configuration>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="26c93727-542e-40b3-8d87-0922eb0a34a4" name="Default" comment="" />
+      <created>1538276014672</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1538276014672</updated>
+    </task>
+    <servers />
+  </component>
+  <component name="ToolWindowManager">
+    <frame x="-8" y="-8" width="1936" height="1056" extended-state="6" />
+    <editor active="true" />
+    <layout>
+      <window_info anchor="bottom" id="Android Profiler" show_stripe_button="false" />
+      <window_info anchor="bottom" id="TODO" order="6" />
+      <window_info anchor="right" id="Palette&#9;" />
+      <window_info id="Image Layers" />
+      <window_info id="Build Variants" side_tool="true" />
+      <window_info anchor="right" id="Capture Analysis" />
+      <window_info anchor="bottom" id="Event Log" side_tool="true" />
+      <window_info anchor="bottom" id="Run" order="2" />
+      <window_info anchor="bottom" id="Version Control" show_stripe_button="false" />
+      <window_info anchor="bottom" id="Terminal" />
+      <window_info anchor="bottom" id="Logcat" />
+      <window_info id="Captures" />
+      <window_info id="Capture Tool" />
+      <window_info id="Designer" />
+      <window_info content_ui="combo" id="Project" order="0" visible="true" weight="0.25" />
+      <window_info id="Structure" order="1" side_tool="true" weight="0.25" />
+      <window_info anchor="right" id="Fabric" />
+      <window_info anchor="right" id="Device File Explorer" side_tool="true" />
+      <window_info anchor="right" id="Theme Preview" />
+      <window_info anchor="bottom" id="Debug" order="3" weight="0.4" />
+      <window_info id="Favorites" side_tool="true" />
+      <window_info anchor="bottom" id="Find" order="1" />
+      <window_info anchor="right" id="Commander" order="0" weight="0.4" />
+      <window_info anchor="right" content_ui="combo" id="Hierarchy" order="2" weight="0.25" />
+      <window_info anchor="bottom" id="Inspection" order="5" weight="0.4" />
+      <window_info anchor="right" id="Ant Build" order="1" weight="0.25" />
+      <window_info anchor="bottom" id="Cvs" order="4" weight="0.25" />
+      <window_info anchor="bottom" id="Message" order="0" />
+    </layout>
+  </component>
+  <component name="VcsContentAnnotationSettings">
+    <option name="myLimit" value="2678400000" />
+  </component>
+  <component name="editorHistoryManager">
+    <entry file="file://$PROJECT_DIR$/lib/main.dart">
+      <provider selected="true" editor-type-id="text-editor">
+        <state relative-caret-position="162">
+          <caret line="6" column="49" lean-forward="true" selection-start-line="6" selection-start-column="49" selection-end-line="6" selection-end-column="49" />
+        </state>
+      </provider>
+    </entry>
+  </component>
+</project>
\ No newline at end of file
diff --git a/example/lib/main.dart b/example/lib/main.dart
index 15b42a9..2acf837 100644
--- a/example/lib/main.dart
+++ b/example/lib/main.dart
@@ -59,7 +59,7 @@ class _MyHomePageState extends State<MyHomePage> {
                   height: ScreenUtil().setHeight(200),
                   color: Colors.red,
                   child: Text(
-                    '我的宽度${ScreenUtil().setWidth(375)}dp',
+                    'My width:${ScreenUtil().setWidth(375)}dp',
                     style: TextStyle(color: Colors.white),
                   ),
                 ),
@@ -67,17 +67,24 @@ class _MyHomePageState extends State<MyHomePage> {
                   width: ScreenUtil().setWidth(375),
                   height: ScreenUtil().setHeight(200),
                   color: Colors.blue,
-                  child: Text('我的宽度${ScreenUtil().setWidth(375)}dp',
+                  child: Text('My width:${ScreenUtil().setWidth(375)}dp',
                       style: TextStyle(color: Colors.white)),
                 ),
               ],
             ),
-            Text('设备的屏幕宽度：${ScreenUtil.screenWidth}px'),
-            Text('设备的屏幕高度:${ScreenUtil.screenHeight}px'),
-            Text('设备的像素密度:${ScreenUtil.pixelRatio}'),
-            Text('底部安全区距离:${ScreenUtil.bottomBarHeight}px'),
-            Text('状态栏高度:${ScreenUtil.statusBarHeight}px'),
+            Text('Device width：${ScreenUtil.screenWidth}px'),
+            Text('Device height:${ScreenUtil.screenHeight}px'),
+            Text('Device pixel density:${ScreenUtil.pixelRatio}'),
+            Text('Bottom safe zone distance:${ScreenUtil.bottomBarHeight}px'),
+            Text('Status bar height:${ScreenUtil.statusBarHeight}px'),
+            Text(
+              'Width is enlarged relative to the design draft:${ScreenUtil().scaleWidth}',
+              style: TextStyle(),
+            ),
+            Text(
+                'Height is enlarged relative to the design draft:${ScreenUtil().scaleHeight}'),
           ],
+          crossAxisAlignment: CrossAxisAlignment.center,
         ),
       ),
     );