diff --git a/android/app/build.gradle b/android/app/build.gradle
index 4091af1..c3c8f8f 100644
--- a/android/app/build.gradle
+++ b/android/app/build.gradle
@@ -51,6 +51,10 @@ android {
             // TODO: Add your own signing config for the release build.
             // Signing with the debug keys for now, so `flutter run --release` works.
             signingConfig signingConfigs.debug
+            minifyEnabled true
+            useProguard true
+
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
 }
diff --git a/android/app/proguard-rules.pro b/android/app/proguard-rules.pro
new file mode 100644
index 0000000..2f9b4bf
--- /dev/null
+++ b/android/app/proguard-rules.pro
@@ -0,0 +1,81 @@
+-optimizationpasses 5
+
+# 混合时不使用大小写混合，混合后的类名为小写
+-dontusemixedcaseclassnames
+
+# 指定不去忽略非公共库的类
+-dontskipnonpubliclibraryclasses
+
+# 这句话能够使我们的项目混淆后产生映射文件
+# 包含有类名->混淆后类名的映射关系
+-verbose
+
+# 指定不去忽略非公共库的类成员
+-dontskipnonpubliclibraryclassmembers
+
+# 不做预校验，preverify是proguard的四个步骤之一，Android不需要preverify，去掉这一步能够加快混淆速度。
+-dontpreverify
+
+# 保留Annotation不混淆
+-keepattributes *Annotation*,InnerClasses
+
+# 避免混淆泛型
+-keepattributes Signature
+
+# 抛出异常时保留代码行号
+-keepattributes SourceFile,LineNumberTable
+
+# 指定混淆是采用的算法，后面的参数是一个过滤器
+# 这个过滤器是谷歌推荐的算法，一般不做更改
+-optimizations !code/simplification/cast,!field/*,!class/merging/*
+
+
+# 保留我们使用的四大组件，自定义的Application等等这些类不被混淆
+# 因为这些子类都有可能被外部调用
+-keep public class * extends android.app.Activity
+-keep public class * extends android.app.Appliction
+-keep public class * extends android.app.Service
+-keep public class * extends android.content.BroadcastReceiver
+-keep public class * extends android.content.ContentProvider
+-keep public class * extends android.app.backup.BackupAgentHelper
+-keep public class * extends android.preference.Preference
+-keep public class * extends android.view.View
+-keep public class com.android.vending.licensing.ILicensingService
+
+ -keep class * extends android.app.Fragment {
+     public void setUserVisibleHint(boolean);
+     public void onHiddenChanged(boolean);
+     public void onResume();
+     public void onPause();
+ }
+ -keep class android.support.v4.app.Fragment {
+     public void setUserVisibleHint(boolean);
+     public void onHiddenChanged(boolean);
+     public void onResume();
+     public void onPause();
+ }
+ -keep class * extends android.support.v4.app.Fragment {
+     public void setUserVisibleHint(boolean);
+     public void onHiddenChanged(boolean);
+     public void onResume();
+     public void onPause();
+ }
+
+##---------------Begin: proguard configuration for Gson  ----------
+# Gson uses generic type information stored in a class file when working with fields. Proguard
+# removes such information by default, so configure it to keep all of it.
+-keepattributes Signature
+
+# For using GSON @Expose annotation
+-keepattributes *Annotation*
+
+-keep class io.flutter.app.** { *; }
+-keep class io.flutter.plugin.**  { *; }
+-keep class io.flutter.util.**  { *; }
+-keep class io.flutter.view.**  { *; }
+-keep class io.flutter.**  { *; }
+-keep class io.flutter.plugins.**  { *; }
+
+
+-dontwarn android.arch.**
+-dontwarn io.flutter.**
\ No newline at end of file
diff --git a/lib/member/LoanInfo.dart b/lib/member/LoanInfo.dart
index f858c29..9d199db 100644
--- a/lib/member/LoanInfo.dart
+++ b/lib/member/LoanInfo.dart
@@ -31,7 +31,7 @@ class LoandInfo{
       StringBuffer sb=new StringBuffer();
 //     sb.write("本金:"+Utils.formatNumber(baseMoney)+"元");
 //     sb.write("\n总的利息:"+ Utils.formatNumber(interestTotal)+"元");
-     sb.write("年利率:"+Utils.formatNumber(yearRate*100)+" %"+"元");
+     sb.write("年利率:"+Utils.formatNumber(yearRate*100)+" %");
      if(interestYear!=0){
        sb.write("\n一年的利息:"+Utils.formatNumber(interestYear)+"元");
      }
diff --git a/lib/utils/Utils.dart b/lib/utils/Utils.dart
index 01ada20..4f61cdc 100644
--- a/lib/utils/Utils.dart
+++ b/lib/utils/Utils.dart
@@ -1,3 +1,4 @@
+import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 class Utils{
 
@@ -12,4 +13,10 @@ class Utils{
 
   }
 
+
+  static void closeKeybord(BuildContext context){
+
+    FocusScope.of(context).requestFocus(FocusNode());
+  }
+
 }
\ No newline at end of file
diff --git a/lib/view/loan_page.dart b/lib/view/loan_page.dart
index 5725964..ae4c280 100644
--- a/lib/view/loan_page.dart
+++ b/lib/view/loan_page.dart
@@ -6,6 +6,7 @@ import 'package:loan_calc/utils/ToastUtils.dart';
 import 'package:loan_calc/utils/calc.dart';
 import 'package:loan_calc/view/date_drop_down.dart';
 import 'package:loan_calc/view/rate_drop_down.dart';
+import 'package:loan_calc/utils/Utils.dart';
 
 class LoanActivity extends StatelessWidget {
   @override
@@ -49,6 +50,7 @@ class _MyLoadPageState extends State<MyLoadPage> {
   String displayDetail = "";
 
   void checkAndCalc(TapUpDetails details) {
+    Utils.closeKeybord(context);
     if (moneyController.text.isEmpty) {
       showTaost("金额不能为空");
       return null;
@@ -64,6 +66,7 @@ class _MyLoadPageState extends State<MyLoadPage> {
       return null;
     }
 
+
     double money = double.parse(moneyController.text);
 
     int time = int.parse(timeController.text);