diff --git a/src/gui/widget/adapter.cc b/src/gui/widget/adapter.cc
index 44999d5c..5be6993b 100755
--- a/src/gui/widget/adapter.cc
+++ b/src/gui/widget/adapter.cc
@@ -59,6 +59,16 @@ bool Adapter::isEmpty()const{
 }
 
 ///////////////////////////////////////////////////////////////////////////////////////////////
+PagerAdapter::PagerAdapter(){
+    mViewPagerObserver = nullptr;
+}
+
+PagerAdapter::~PagerAdapter(){
+}
+
+int PagerAdapter::getCount(){
+    return 0;
+}
 
 void PagerAdapter::startUpdate(ViewGroup* container){
 }
diff --git a/src/gui/widget/adapter.h b/src/gui/widget/adapter.h
index b493c611..357f0e13 100755
--- a/src/gui/widget/adapter.h
+++ b/src/gui/widget/adapter.h
@@ -134,7 +134,9 @@ public:
     static constexpr int POSITION_UNCHANGED =-1;
     static constexpr int POSITION_NONE = -2;
 public:
-    virtual int getCount(){return 0;}
+    PagerAdapter();
+    virtual ~PagerAdapter();
+    virtual int getCount();
     virtual void startUpdate(ViewGroup* container);
     virtual void*instantiateItem(ViewGroup* container, int position);
     virtual void destroyItem(ViewGroup* container, int position, void* object);
diff --git a/src/gui/widget/scrollview.cc b/src/gui/widget/scrollview.cc
index 5dfe0030..1a0e3d1e 100644
--- a/src/gui/widget/scrollview.cc
+++ b/src/gui/widget/scrollview.cc
@@ -16,6 +16,10 @@ ScrollView::ScrollView(Context*ctx,const AttributeSet&atts)
     initScrollView();
 }
 
+ScrollView::~ScrollView(){
+    delete mScroller;
+}
+
 float ScrollView::getTopFadingEdgeStrength() {
     if (getChildCount() == 0) {
         return 0.0f;
@@ -53,8 +57,8 @@ void ScrollView::initScrollView() {
     setFocusable(true);
     setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
     setWillNotDraw(false);
-    mFillViewport=false;
-    mVelocityTracker =nullptr;
+    mFillViewport = false;
+    mVelocityTracker = nullptr;
     mEdgeGlowTop = mEdgeGlowBottom =nullptr;
     ViewConfiguration& configuration = ViewConfiguration::get(mContext);
     mTouchSlop = configuration.getScaledTouchSlop();
diff --git a/src/gui/widget/scrollview.h b/src/gui/widget/scrollview.h
index 738517eb..c0fa20e6 100644
--- a/src/gui/widget/scrollview.h
+++ b/src/gui/widget/scrollview.h
@@ -74,6 +74,7 @@ protected:
 public:
     ScrollView(int w,int h);
     ScrollView(Context*ctx,const AttributeSet&atts);
+    ~ScrollView()override;
     int getMaxScrollAmount();
     View& addView(View* child)override;
     View& addView(View* child, int index)override;