UIScreen helper class, derive your newUI screens from this.

Android.mk

@@ -63,6 +63,7 @@ LOCAL_SRC_FILES :=\
     ui/view.cpp \
     ui/viewgroup.cpp \
     ui/ui.cpp \
+    ui/ui_screen.cpp \
     ui/ui_context.cpp \
     ui/screen.cpp \
     ui/virtual_input.cpp \

native.vcxproj

@@ -244,6 +244,7 @@
     <ClInclude Include="ui\screen.h" />
     <ClInclude Include="ui\ui.h" />
     <ClInclude Include="ui\ui_context.h" />
+    <ClInclude Include="ui\ui_screen.h" />
     <ClInclude Include="ui\view.h" />
     <ClInclude Include="ui\viewgroup.h" />
     <ClInclude Include="ui\virtual_input.h" />
@@ -361,6 +362,7 @@
     <ClCompile Include="ui\screen.cpp" />
     <ClCompile Include="ui\ui.cpp" />
     <ClCompile Include="ui\ui_context.cpp" />
+    <ClCompile Include="ui\ui_screen.cpp" />
     <ClCompile Include="ui\view.cpp" />
     <ClCompile Include="ui\viewgroup.cpp" />
     <ClCompile Include="ui\virtual_input.cpp" />

native.vcxproj.filters

@@ -269,6 +269,9 @@
     <ClInclude Include="base\functional.h">
       <Filter>base</Filter>
     </ClInclude>
+    <ClInclude Include="ui\ui_screen.h">
+      <Filter>ui</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="gfx\gl_debug_log.cpp">
@@ -474,6 +477,9 @@
     <ClCompile Include="net\url.cpp">
       <Filter>net</Filter>
     </ClCompile>
+    <ClCompile Include="ui\ui_screen.cpp">
+      <Filter>ui</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <Filter Include="gfx">

ui/ui_screen.cpp

@@ -0,0 +1,37 @@
+
+#include "ui/ui_screen.h"
+#include "ui/ui_context.h"
+#include "ui/screen.h"
+
+void UIScreen::update(InputState &input) {
+	if (!root_) {
+		CreateViews();
+	}
+
+	if (orientationChanged_) {
+		delete root_;
+		root_ = 0;
+		CreateViews();
+	}
+
+	UpdateViewHierarchy(input, root_);
+}
+
+void UIScreen::render() {
+	UI::LayoutViewHierarchy(*screenManager()->getUIContext(), root_);
+
+	screenManager()->getUIContext()->Begin();
+	DrawBackground();
+	root_->Draw(*screenManager()->getUIContext());
+	screenManager()->getUIContext()->End();
+	screenManager()->getUIContext()->Flush();
+}
+
+void UIScreen::touch(const TouchInput &touch) {
+	root_->Touch(touch);
+}
+
+UI::EventReturn UIScreen::OnBack(UI::EventParams &e) {
+	screenManager()->finishDialog(this, DR_OK);
+	return UI::EVENT_DONE;
+}

ui/ui_screen.h

@@ -0,0 +1,24 @@
+#pragma once
+
+#include "ui/screen.h"
+#include "ui/viewgroup.h"
+
+class UIScreen : public Screen {
+public:
+	UIScreen() : Screen(), root_(0), orientationChanged_(false) {}
+	~UIScreen() { delete root_; }
+
+	virtual void update(InputState &input);
+	virtual void render();
+	virtual void touch(const TouchInput &touch);
+
+	// Some useful default event handlers
+	UI::EventReturn OnBack(UI::EventParams &e);
+
+protected:
+	virtual void CreateViews() = 0;
+	virtual void DrawBackground() {}
+
+	UI::ViewGroup *root_;
+	bool orientationChanged_;
+};