diff --git a/README.md b/README.md
index 92a7969..64ee4bd 100644
--- a/README.md
+++ b/README.md
@@ -2,7 +2,7 @@
 Beam 是一套基于MVP模式的快速开发框架。定义了一套开发规范。并提供了基于这套规范的Activity，Fragment，Presenter，Model等父类及控件和API等，完成APP开发过程中大量繁琐工作。
 
 ##依赖
-`compile 'com.jude:beam:2.7.3'`
+`compile 'com.jude:beam:2.7.5'`
 
 ##MVP概念
 MVP模式在Android开发中的使用越来越流行，它十分适合Android。最好先看看[本框架对MVP的理解](http://www.jianshu.com/p/ed2aa9546c2c)。
diff --git a/beam/build.gradle b/beam/build.gradle
index 8bb4c98..17338ee 100644
--- a/beam/build.gradle
+++ b/beam/build.gradle
@@ -31,7 +31,7 @@ ext {
     gitUrl = 'https://github.com/Jude95/RequestVolley'
 
 
-    libraryVersion = '2.7.3'//版本号
+    libraryVersion = '2.7.5'//版本号
     libraryName = 'beam'//项目名字，没什么用
     libraryDescription = 'A framwork for Android'//项目描述，没什么用
 
diff --git a/beam/src/main/java/com/jude/beam/bijection/BeamFragment.java b/beam/src/main/java/com/jude/beam/bijection/BeamFragment.java
index e9fd042..1f971f0 100644
--- a/beam/src/main/java/com/jude/beam/bijection/BeamFragment.java
+++ b/beam/src/main/java/com/jude/beam/bijection/BeamFragment.java
@@ -2,9 +2,11 @@
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.annotation.IdRes;
 import android.support.annotation.NonNull;
 import android.support.annotation.Nullable;
 import android.support.v4.app.Fragment;
+import android.view.View;
 
 /**
  * This view is an example of how a view should control it's presenter.
@@ -55,9 +57,16 @@ public void onPause() {
     @Override
     public void onActivityResult(int requestCode, int resultCode, Intent data) {
         super.onActivityResult(requestCode, resultCode, data);
-        helper.onResult(requestCode, resultCode,data);
+        helper.onResult(requestCode, resultCode, data);
     }
 
+    protected final <E extends View> E $(@NonNull View view,@IdRes int id){
+        return (E)view.findViewById(id);
+    }
+
+    protected final <E extends View> E viewId(@NonNull View view,@IdRes int id){
+        return (E)view.findViewById(id);
+    }
 
     public PresenterType getPresenter() {
         return helper.getPresenter();
diff --git a/beam/src/main/java/com/jude/beam/expansion/BeamBaseActivity.java b/beam/src/main/java/com/jude/beam/expansion/BeamBaseActivity.java
index a1ef5a7..7b04da8 100644
--- a/beam/src/main/java/com/jude/beam/expansion/BeamBaseActivity.java
+++ b/beam/src/main/java/com/jude/beam/expansion/BeamBaseActivity.java
@@ -1,6 +1,7 @@
 package com.jude.beam.expansion;
 
 import android.support.annotation.IdRes;
+import android.support.annotation.NonNull;
 import android.support.v7.widget.Toolbar;
 import android.view.MenuItem;
 import android.view.View;
@@ -104,12 +105,17 @@ public final ViewExpansionDelegate getExpansion() {
         return mDelegate;
     }
 
-    protected final <E extends View> E $(View view,@IdRes int id){
+    protected final <E extends View> E $(@NonNull View view,@IdRes int id){
+        return (E)view.findViewById(id);
+    }
+    protected final <E extends View> E viewId(@NonNull View view,@IdRes int id){
         return (E)view.findViewById(id);
     }
     protected final <E extends View> E $(@IdRes int id){
         return (E)findViewById(id);
     }
-
+    protected final <E extends View> E viewId(@IdRes int id){
+        return (E)findViewById(id);
+    }
 
 }
diff --git a/beam/src/main/java/com/jude/beam/expansion/list/BeamListActivity.java b/beam/src/main/java/com/jude/beam/expansion/list/BeamListActivity.java
index 2ed02b7..77a03e5 100644
--- a/beam/src/main/java/com/jude/beam/expansion/list/BeamListActivity.java
+++ b/beam/src/main/java/com/jude/beam/expansion/list/BeamListActivity.java
@@ -39,10 +39,12 @@ protected void onCreate(Bundle savedInstanceState) {
     }
 
     public void stopRefresh(){
-        mListView.getSwipeToRefresh().setRefreshing(false);
+        if(mListView!=null)
+            mListView.getSwipeToRefresh().setRefreshing(false);
     }
     public void showError(Throwable e){
-        mListView.showError();
+        if (mListView!=null)
+            mListView.showError();
     }
 
     public int getLayout(){
diff --git a/beam/src/main/java/com/jude/beam/expansion/list/BeamListFragment.java b/beam/src/main/java/com/jude/beam/expansion/list/BeamListFragment.java
index aa8e67a..885d414 100644
--- a/beam/src/main/java/com/jude/beam/expansion/list/BeamListFragment.java
+++ b/beam/src/main/java/com/jude/beam/expansion/list/BeamListFragment.java
@@ -47,10 +47,12 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
     }
 
     public void stopRefresh(){
-        mListView.getSwipeToRefresh().setRefreshing(false);
+        if(mListView!=null)
+            mListView.getSwipeToRefresh().setRefreshing(false);
     }
     public void showError(Throwable e){
-        mListView.showError();
+        if (mListView!=null)
+            mListView.showError();
     }
 
     public int getLayout(){
diff --git a/beam/src/main/java/com/jude/beam/expansion/overlay/ViewExpansionDelegateProvider.java b/beam/src/main/java/com/jude/beam/expansion/overlay/ViewExpansionDelegateProvider.java
index 6745101..457b6ca 100644
--- a/beam/src/main/java/com/jude/beam/expansion/overlay/ViewExpansionDelegateProvider.java
+++ b/beam/src/main/java/com/jude/beam/expansion/overlay/ViewExpansionDelegateProvider.java
@@ -5,10 +5,10 @@
 /**
  * Created by Mr.Jude on 2015/8/17.
  */
-public abstract class ViewExpansionDelegateProvider {
-    public abstract ViewExpansionDelegate createViewExpansionDelegate(BeamBaseActivity activity);
+public interface ViewExpansionDelegateProvider {
+    ViewExpansionDelegate createViewExpansionDelegate(BeamBaseActivity activity);
 
-    public static ViewExpansionDelegateProvider DEFAULT = new ViewExpansionDelegateProvider() {
+    ViewExpansionDelegateProvider DEFAULT = new ViewExpansionDelegateProvider() {
         @Override
         public ViewExpansionDelegate createViewExpansionDelegate(BeamBaseActivity activity) {
             return new DefaultViewExpansionDelegate(activity);
diff --git a/demo/src/main/java/com/jude/beamdemo/app/APP.java b/demo/src/main/java/com/jude/beamdemo/app/APP.java
index 8884602..23e79c0 100644
--- a/demo/src/main/java/com/jude/beamdemo/app/APP.java
+++ b/demo/src/main/java/com/jude/beamdemo/app/APP.java
@@ -3,7 +3,10 @@
 import android.app.Application;
 
 import com.jude.beam.Beam;
+import com.jude.beam.expansion.BeamBaseActivity;
 import com.jude.beam.expansion.list.ListConfig;
+import com.jude.beam.expansion.overlay.ViewExpansionDelegate;
+import com.jude.beam.expansion.overlay.ViewExpansionDelegateProvider;
 import com.jude.beamdome.R;
 import com.jude.utils.JUtils;
 
@@ -17,6 +20,12 @@ public void onCreate() {
         JUtils.initialize(this);
         JUtils.setDebug(true, "BeamTest");
         Beam.init(this);
+        Beam.setViewExpansionDelegateProvider(new ViewExpansionDelegateProvider() {
+            @Override
+            public ViewExpansionDelegate createViewExpansionDelegate(BeamBaseActivity activity) {
+                return null;
+            }
+        });
         ListConfig.setDefaultListConfig(
                 new ListConfig().
                         setRefreshAble(true).
diff --git a/demo/src/main/java/com/jude/beamdemo/ui/MainActivity.java b/demo/src/main/java/com/jude/beamdemo/ui/MainActivity.java
index 013af99..97ca50b 100644
--- a/demo/src/main/java/com/jude/beamdemo/ui/MainActivity.java
+++ b/demo/src/main/java/com/jude/beamdemo/ui/MainActivity.java
@@ -17,5 +17,6 @@ public class MainActivity extends BeamBaseActivity<MainPresenter> {
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
+        data(5,5);
     }
 }