By José Enrique Amaro Soriano

Android es el sistema operativo de Google para smartphones, drugs, y otros dispositivos móviles. En este libro se presentan, de una forma práctica, comprensible y concisa, los conceptos esenciales para desarrollar sus propias aplicaciones de Android, programando en lenguaje Java. El lector aprenderá a programar interfaces de usuario, entrada y salida de datos, lectura y escritura de ficheros, herramientas gráficas, gráficos interactivos, visualización de imágenes, reproducción de sonido, temas, recursos, procesos en history, diálogos de progreso, notificaciones, animaciones gráficas y simulaciones. Se incluye un apéndice Elementos de Java para el lector que no conozca el lenguaje de programación Java. Para lectores más avanzados, el libro se complementa con otro apéndice donde se introduce una completa aplicación científica para Android.
Todos los conceptos se introducen con ejemplos que consisten en programas sencillos ilustrando algún aspecto concreto de Android o de Java. Todos los ejemplos se acompañan con capturas de pantalla.
Este libro está dirigido a estudiantes, profesores y en basic al principiante con escasos o nulos conocimientos de Java que quiere escribir rápidamente sus propios programas. También al profesional que quiere iniciarse de forma rápida en el desarrollo de aplicaciones para Android.
José Enrique Amaro Sorinano es surgeon en Ciencias Físicas y Profesor Titular de l. a. Universidad de Granada. Desarrolla su docencia e investigación en el departamento de Física Atómica, Molecular y Nuclear. Es investigador responsable del Grupo de Física Nuclear a Energías Intermedias y miembro del Instituto Carlos I de Física Teórica y Computacional. Actualmente imparte un curso de Programación de Android para Científicos en los angeles Escuela de Posgrado de l. a. Universidad de Granada.

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0 That’s one solution, as long as we’re OK with the default values. But here they don’t quite make sense because we probably never want an iOS device with an empty string for a name. Plan B: we can make everything optionals. To do this, we append the optional type ? to the properties. var name : String? var screenHeight : Double? var screenWidth : Double? Again, no more error, so that’s good. Problem now is that any code that wants to access these properties has to do the if let dance from the last chapter to safely unwrap the optionals.

Next, we have properties, the variables or constants associated with an object instance. In this case, we are creating three variables: name, screenHeight, and screenWidth. There’s just one problem: this code produces an error. We need to start thinking about how our properties work. Properties The error flag tells us “Class IOSDevice has no initializers,” and the red-circle instant-fix icon offers three problems and solutions. The problem for each is that there is no initial value for these properties.

Swift var screenHeightAndWidth : (height: Double, width: Double) { get { return (screenHeight, screenWidth) } } This is a lot like our other computed properties, but the type of the variable is in parentheses, which makes it a tuple. Inside the tuple definition, we identify each member by a name (which is not required) and a type. So, this tuple has two members, named height and width. Then we just use parentheses in our return line to package these values into a tuple. To use the tuple, just access it like any other variable.

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