{"id":1400,"date":"2014-01-20T18:17:47","date_gmt":"2014-01-20T16:17:47","guid":{"rendered":"http:\/\/www.espai.es\/blog\/?p=1400"},"modified":"2015-07-10T11:51:11","modified_gmt":"2015-07-10T10:51:11","slug":"hello-android-iii","status":"publish","type":"post","link":"https:\/\/www.espai.es\/blog\/2014\/01\/hello-android-iii\/","title":{"rendered":"Hello Android! (III)"},"content":{"rendered":"<p>Hola a tod@s, y bienvenidos a una nueva entrega de la serie Hello Android! (III). Como el tema es m\u00e1s largo de lo que parec\u00eda (s\u00ed, una vez m\u00e1s) a\u00f1adiremos un nuevo art\u00edculo. La cosa quedar\u00e1 en pentalog\u00eda, y de \u00e9sta manera:<\/p>\n<p>&nbsp;<\/p>\n<ul>\n<li>Introducci\u00f3n a Android (I)<\/li>\n<li>Primera aplicaci\u00f3n (II, <strong>III <\/strong>y IV)<\/li>\n<li>Integraci\u00f3n con otras aplicaciones (V)<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 13px\">Hoy escribiremos el c\u00f3digo de nuestro programa (m\u00ednimo), y veremos el proceso para crear dispositivos virtuales, instalar diferentes versiones de Android \u00a0y crear la aplicaci\u00f3n. Como ya llevamos bastante teor\u00eda, sin m\u00e1s rollos vamos al <\/span><span style=\"text-decoration: underline\">l\u00edo<\/span><span style=\"font-size: 13px\">!<\/span><\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Yangts\u00e9.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1432 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Yangts\u00e9.png\" alt=\"Hello Android! (III)\" width=\"576\" height=\"355\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Yangts\u00e9.png 576w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Yangts\u00e9-300x184.png 300w\" sizes=\"auto, (max-width: 576px) 100vw, 576px\" \/><\/a>L\u00edo<\/p>\n<p>&nbsp;<\/p>\n<h2><span style=\"font-size: 13px\">Hello Android! (III): Creaci\u00f3n de un proyecto Android<\/span><\/h2>\n<p>Este paso no ser\u00e1 necesario, porque vamos a reutilizar el proyecto creado en Hello Android! (II).<\/p>\n<p>Una vez hay\u00e1is abierto ese proyecto, vamos a a\u00f1adir un Activity que se llamar\u00e1 igual: HelloAndroid<\/p>\n<p>&nbsp;<\/p>\n<p>Si puls\u00e1is Control+N, aparecer\u00e1 el asistente de Eclipse para a\u00f1adir archivos al proyecto:<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/1.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1412 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/1.png\" alt=\"Hello Android! (III)\" width=\"700\" height=\"503\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/1.png 700w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/1-300x215.png 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p style=\"text-align: center\">A\u00f1adiendo un Activity (1 de 3)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/2.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1413 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/2.png\" alt=\"Hello Android! (III)\" width=\"700\" height=\"503\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/2.png 700w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/2-300x215.png 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p style=\"text-align: center\">A\u00f1adiendo un Activity (2 de 3)<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/3.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1414 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/3.png\" alt=\"Hello Android! (III)\" width=\"700\" height=\"503\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/3.png 700w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/3-300x215.png 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/p>\n<p style=\"text-align: center\">A\u00f1adiendo un Activity (3 de 3)<\/p>\n<p>&nbsp;<\/p>\n<p>El resultado ser\u00e1 algo as\u00ed:<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/4.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1415 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/4-1024x555.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"347\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/4-1024x555.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/4-300x162.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/4.png 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Ahora mismo no hay c\u00f3digo, solo el m\u00ednimo para definir la clase. Los Activities son la unidad b\u00e1sica de construcci\u00f3n en Android. Si ven\u00eds de Java, el equivalente ser\u00eda un JFrame. Si ven\u00eds de Visual Basic, un Formulario y si no hab\u00edais programado antes no os preocup\u00e9is, simplemente representa\u00a0una pantalla de nuestra aplicaci\u00f3n.<\/p>\n<p><span style=\"font-size: 13px\">Al crear el Activity, se han a\u00f1adido 3 cosas a nuestro proyecto:<\/span><\/p>\n<ol>\n<li><span style=\"font-size: 13px\">Clase Java\u00a0<strong>es.espai.helloandroid.HelloAndroid<\/strong>. En ella programaremos el \u00abcomportamiento\u00bb de nuestra aplicaci\u00f3n.<\/span><\/li>\n<li>Fichero XML\u00a0<strong>activity_hello_android.xml<\/strong>. En \u00e9l dise\u00f1aremos la interfaz de usuario, a\u00f1adiendo los botones, imagenes y todo lo que necesitemos.<\/li>\n<li>Entrada en <strong>AndroidManifest.xml<\/strong>. Este fichero es el \u00abcontrol central\u00bb de nuestro proyecto, donde aparecen todos los activities y dem\u00e1s elementos que componen nuestra aplicaci\u00f3n.<\/li>\n<\/ol>\n<p>Antes de ejecutar el proyecto, debemos crear un dispositivo virtual, como un tel\u00e9fono\/tablet dentro de nuestro ordenador para ver el programa en marcha. Para ello seguir los siguientes pasos:<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/5.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1418 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/5-1024x555.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"347\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/5-1024x555.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/5-300x162.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/5.png 1913w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Abrimos el gestor de dispositivos virtuales<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/6.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1419 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/6-1024x547.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"342\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/6-1024x547.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/6-300x160.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/6.png 1915w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Creamos un nuevo dispositivo<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/7.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1420 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/7-1024x576.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"360\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/7-1024x576.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/7-300x168.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/7.png 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Definimos las opciones que aparecen en la captura<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/8.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1421 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/8-1024x551.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"344\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/8-1024x551.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/8-300x161.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/8.png 1915w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Cerramos el gestor de dispositivos<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/9.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1422 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/9-1024x576.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"360\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/9-1024x576.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/9-300x168.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/9.png 1920w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Lanzamos nuestra aplicaci\u00f3n, para que se ejecute en el dispositivo creado<\/p>\n<p>En este punto s\u00ed deber\u00eda funcionar, ya que el programa tiene un dispositivo virtual sobre el que ejecutarse.<\/p>\n<p>En cuanto a la creaci\u00f3n del dispositivo virtual, es posible que no os salga la opci\u00f3n \u00abtarget: Android 2.3.3\u00bb. Esto es porque el entorno de desarrollo (ADT Bundle) viene por defecto con la \u00faltima versi\u00f3n, que ahora mismo es la 4.4. Lo que haremos para poder usar la 2.3 es descargarla, para ello deberemos seguir los siguientes pasos:<\/p>\n<p>&nbsp;<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/10.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1423 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/10-1024x549.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"343\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/10-1024x549.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/10-300x160.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/10.png 1915w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Abrimos el gestor del SDK de Android<\/p>\n<p><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/11.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1424 size-large\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/11-1024x549.png\" alt=\"Hello Android! (III)\" width=\"640\" height=\"343\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/11-1024x549.png 1024w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/11-300x160.png 300w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/11.png 1919w\" sizes=\"auto, (max-width: 640px) 100vw, 640px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Seleccionamos la versi\u00f3n 2.2, y pulsamos Instalar<\/p>\n<p>Lo que hemos hecho en las 2 captura anteriores, es abrir el \u00abgestor de versiones\u00bb por as\u00ed llamarlo de Android, y descargar la versi\u00f3n 2.3 en nuestro ordenador. Ahora, cerrad eclipse y abridlo de nuevo, y al crear el dispositivo virtual, ahora s\u00ed que saldr\u00e1 la opci\u00f3n \u00abtarget : Android 2.3\u00bb.<\/p>\n<p>&nbsp;<\/p>\n<p>Si ahora ejecutamos la aplicaci\u00f3n tardar\u00e1 unos minutos, ya que el emulador es bastante pesado. Por lo tanto:<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Chief_Wiggum.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1430 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Chief_Wiggum.jpg\" alt=\"Hello Android! (III)\" width=\"610\" height=\"800\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Chief_Wiggum.jpg 610w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/Chief_Wiggum-228x300.jpg 228w\" sizes=\"auto, (max-width: 610px) 100vw, 610px\" \/><\/a><\/p>\n<p style=\"text-align: center\">Momento donut, caf\u00e9&#8230; En definitiva, un descanso.<br \/>\n\u00a1Y deja el Facebook, lo acabas de mirar que te he visto!<\/p>\n<p>&nbsp;<\/p>\n<p>Despu\u00e9s de unos minutos&#8230; Oh m\u00e1gica visi\u00f3n<\/p>\n<p>&nbsp;<\/p>\n<p style=\"text-align: center\"><a href=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/12.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-1426 size-full\" src=\"http:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/12.png\" alt=\"Hello Android! (III)\" width=\"718\" height=\"833\" srcset=\"https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/12.png 718w, https:\/\/www.espai.es\/blog\/wp-content\/uploads\/2014\/01\/12-258x300.png 258w\" sizes=\"auto, (max-width: 718px) 100vw, 718px\" \/><\/a>Nuestra super aplicaci\u00f3n en versi\u00f3n Android<\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 13px\">Por ahora, y para no extender mucho m\u00e1s el art\u00edculo que ya es bastante largo lo dejaremos aqu\u00ed. En el siguiente art\u00edculo haremos una aplicaci\u00f3n para gestionar la lista de la compra y compartirla con otros usuarios, y veremos como publicarlo en nuestro tel\u00e9fono.<\/span><\/p>\n<p>&nbsp;<\/p>\n<p>Hasta el pr\u00f3ximo art\u00edculo en el blog de <a title=\"Escola Espai\" href=\"http:\/\/www.espai.es\/\">Espai<\/a>, y un saludo!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Hola a tod@s, y bienvenidos a una nueva entrega de la serie Hello Android! (III). Como el tema es m\u00e1s largo de lo que parec\u00eda (s\u00ed, una vez m\u00e1s) a\u00f1adiremos un nuevo art\u00edculo. La cosa quedar\u00e1 en pentalog\u00eda, y de \u00e9sta manera: &nbsp; Introducci\u00f3n a&#8230;<\/p>\n","protected":false},"author":3,"featured_media":2401,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_ef_editorial_meta_date_first-draft-date":"","_ef_editorial_meta_paragraph_assignment":"","_ef_editorial_meta_checkbox_needs-photo":"","_ef_editorial_meta_number_word-count":"","_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5,1,101],"tags":[100,208,207,206,89],"class_list":["post-1400","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programacion","category-sin-categoria","category-telefonia-movil","tag-android","tag-cursos-de-programacion","tag-escuela-espai","tag-formacion","tag-programacion-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hello Android! 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