虽然 cocos2d-x自带了三种模式来适应屏幕，但还是存在一些问题，会产生黑边，所以还是需要多套资源来适应屏幕。
这里我选择了四种分辨率9:16 3:5 2:3 3:4，在resource资源目录下新建了四个文件夹放置多套背景图片，在AppDelegate中添加如下函数调用即可。
- void AppDelegate::ScreenAdaptive()
- {
- CCSize szFrame = CCEGLView::sharedOpenGLView()->getFrameSize();
- float Proportion = szFrame.width/szFrame.height;
- const int num = 4;
- float diff[num]={fabs(Proportion-(9.0/16)),
- fabs(Proportion-(3.0/5)),fabs(Proportion-(2.0/3)),fabs(Proportion-(3.0/4))};
- int yy = -1;
- for (int i=0;i<num;i++)
- if((diff[i] >-0.000001) && (diff[i] < 0.000001))
- {
- yy = i;
- break;
- }
- if (yy == -1)
- {
- int min = diff[0];
- yy = 0;
- for (int i=1;i<num;i++)
- if (diff[i]<min)
- {
- min = diff[i];
- yy = i;
- }
- }
- switch(yy)
- {
- case 0:
- {
- std::vector<string> searchPaths;
- searchPaths.push_back("9x16");
- CCFileUtils::sharedFileUtils()->setSearchPaths(searchPaths);
- CCEGLView::sharedOpenGLView()->setDesignResolutionSize(648,1152, kResolutionShowAll);
- break;
- }
- case 1:
- {
- std::vector<string> searchPaths;
- searchPaths.push_back("3x5");
- CCFileUtils::sharedFileUtils()->setSearchPaths(searchPaths);
- CCEGLView::sharedOpenGLView()->setDesignResolutionSize(624,1040, kResolutionShowAll);
- break;
- }
- case 2:
- {
- std::vector<string> searchPaths;
- searchPaths.push_back("2x3");
- CCFileUtils::sharedFileUtils()->setSearchPaths(searchPaths);
- CCEGLView::sharedOpenGLView()->setDesignResolutionSize(640,960, kResolutionShowAll);
- break;
- }
- case 3:
- {
- std::vector<string> searchPaths;
- searchPaths.push_back("3x4");
- CCFileUtils::sharedFileUtils()->setSearchPaths(searchPaths);
- CCEGLView::sharedOpenGLView()->setDesignResolutionSize(624,832, kResolutionShowAll);
- break;
- }
- }
- }
这里简单介绍一下setSearchPaths，在最近更新的版本里，已经没有了setResourceDirectory，取而代之的是setSearchPaths，以下是关于它的描述：
- /**
- * Sets the array of search paths.
- *
- * You can use this array to modify the search path of the resources.
- * If you want to use "themes" or search resources in the "cache", you can do it easily by adding new entries in this array.
- *
- * @note This method could access relative path and absolute path.
- * If the relative path was passed to the vector, CCFileUtils will add the default resource directory before the relative path.
- * For instance:
- * On Android, the default resource root path is "assets/".
- * If "/mnt/sdcard/" and "resources-large" were set to the search paths vector,
- * "resources-large" will be converted to "assets/resources-large" since it was a relative path.
- *
- * @param searchPaths The array contains search paths.
- * @see fullPathForFilename(const char*)
- * @since v2.1
- */
- // set searching paths to "/mnt/sd/example" and "/data/data/org.cocos2dx.example"
- vector<string> searchPaths;
- searchPaths.push_back("/mnt/sd/example");
- searchPaths.push_back("/data/data/org.cocos2dx.example");
- CCFileUtils::setSearchPaths(searchPaths);
- // engine will find "1.png" in /mnt/sd/example, if there it is not found, then engine will find "1.png" in /data/data/org.cocos2dx.example
- // if not found, engine will find "1.png" in Resources/ (this path is platform dependent)
- CCSprite *pSprite = CCSprite::create("1.png");