resolved a black screen for cocos2d-x ver.2.1.4 as entering foreground after tapping the power button

gistfile1.diff

diff --git a/cocos2dx/platform/CCFileUtils.cpp b/cocos2dx/platform/CCFileUtils.cpp
index ba5b497..0faafa7 100755
--- a/cocos2dx/platform/CCFileUtils.cpp
+++ b/cocos2dx/platform/CCFileUtils.cpp
@@ -533,6 +533,7 @@ const char* CCFileUtils::fullPathFromRelativeFile(const char *pszFilename, const
 void CCFileUtils::setSearchResolutionsOrder(const std::vector<std::string>& searchResolutionsOrder)
 {
     bool bExistDefault = false;
+    m_fullPathCache.clear();
     m_searchResolutionsOrderArray.clear();
     for (std::vector<std::string>::const_iterator iter = searchResolutionsOrder.begin(); iter != searchResolutionsOrder.end(); ++iter)
     {
@@ -573,6 +574,7 @@ const std::vector<std::string>& CCFileUtils::getSearchPaths()
 void CCFileUtils::setSearchPaths(const std::vector<std::string>& searchPaths)
 {
     bool bExistDefaultRootPath = false;
+    m_fullPathCache.clear();
     
     m_searchPathArray.clear();
     for (std::vector<std::string>::const_iterator iter = searchPaths.begin(); iter != searchPaths.end(); ++iter)
@@ -620,6 +622,7 @@ void CCFileUtils::addSearchPath(const char* path_)
 
 void CCFileUtils::setFilenameLookupDictionary(CCDictionary* pFilenameLookupDict)
 {
+    m_fullPathCache.clear();
     CC_SAFE_RELEASE(m_pFilenameLookupDict);
     m_pFilenameLookupDict = pFilenameLookupDict;
     CC_SAFE_RETAIN(m_pFilenameLookupDict);
diff --git a/cocos2dx/platform/CCPlatformMacros.h b/cocos2dx/platform/CCPlatformMacros.h
index 662bc9d..3b4e584 100755
--- a/cocos2dx/platform/CCPlatformMacros.h
+++ b/cocos2dx/platform/CCPlatformMacros.h
@@ -81,7 +81,7 @@ Basically,it's only enabled in android
 It's new in cocos2d-x since v0.99.5
 */
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
-    #define CC_ENABLE_CACHE_TEXTURE_DATA       0
+    #define CC_ENABLE_CACHE_TEXTURE_DATA       1
 #else
     #define CC_ENABLE_CACHE_TEXTURE_DATA       0
 #endif