android程序运行时提示:Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!怎么办,还有 Unable to resolve target 'android-15'怎么办
android程序运行时提示:Unknown error: Unable to build: the file dx.jar was not loaded from the SDK folder!怎么办,还有 Unable to resolve target 'android-15'怎么办