Hello, I have a problem. I am changing in the manifest to the following: <uses-sdk android: minSdkVersion = "5" android: targetSdkVersion = "26" /> before was: <uses-sdk android: minSdkVersion = "5" android: targetSdkVersion = "19" /> I'm also changing the way to: C: \ Android \ sdk \ platforms \ android-26 \ android.jar however, when apk is installed, the application opens and stops by closing the application. I was able to use it normally with the API 19, but I have to update. I wonder why?