I have a problem, don`t know if this was to anybody more, I downloaded a sample and working correctly, but to integrate to my proyect, don`t work. It copied and paste in other new project, and worked perfectly. Somebody can help me?, I don´t know if it`s for the activity Main, and in my project the activity it have an other name. Please help, not it`s the first time that it`s make to me