{"id":807,"date":"2021-10-05T04:01:44","date_gmt":"2021-10-05T04:01:44","guid":{"rendered":"https:\/\/es-andreabianchini.it\/andrewsblog\/?p=807"},"modified":"2021-10-12T05:18:40","modified_gmt":"2021-10-12T05:18:40","slug":"a-minimal-app-in-android","status":"publish","type":"post","link":"https:\/\/es-andreabianchini.it\/andrewsblog\/?p=807","title":{"rendered":"A minimal App in Android"},"content":{"rendered":"\n

In questo post vi mostro la struttura minimale di una App Android. In realt\u00e0 potrebbe essere resa ancora pi\u00f9 semplice, ma non chiarirebbe bene quali sono le parti che costituiscono l’App.<\/p>\n\n\n\n

Iniziamo con il file AndroidManifest.xml (directory app\/manifests) :<\/p>\n\n\n\n

<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<manifest xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n    package=\"com.andreabianchini.simpleandroidapp\">\n\n    <application\n        android:allowBackup=\"true\"\n        android:icon=\"@mipmap\/ic_launcher\"\n        android:label=\"@string\/app_name\"\n        android:roundIcon=\"@mipmap\/ic_launcher_round\"\n        android:supportsRtl=\"true\"\n        android:theme=\"@style\/Theme.SimpleAndroidApp\">\n        <activity\n            android:name=\".MainActivity\"\n            android:exported=\"true\">\n            <intent-filter>\n                <action android:name=\"android.intent.action.MAIN\" \/>\n\n                <category android:name=\"android.intent.category.LAUNCHER\" \/>\n            <\/intent-filter>\n        <\/activity>\n    <\/application>\n\n<\/manifest><\/code><\/pre>\n\n\n\n
Passiamo al file che contiene il programma principale dell’App, MainActivity.java (directory app\/java) :<\/p>\n\n\n\n
package com.andreabianchini.simpleandroidapp;\n\nimport androidx.appcompat.app.AppCompatActivity;\n\nimport android.os.Bundle;\n\npublic class MainActivity extends AppCompatActivity {\n\n    @Override\n    protected void onCreate(Bundle savedInstanceState) {\n        super.onCreate(savedInstanceState);\n        setContentView(R.layout.activity_main);\n    }\n}<\/code><\/pre>\n\n\n\n
Al programma (Activity) principale sopra riportato viene associato un file di risorse, activity_main.xml, (directory app\/res\/layout), che serve a definire l’aspetto ed i contenuti grafici della schermata associata all’attivit\u00e0 principale :<\/p>\n\n\n\n
<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<androidx.constraintlayout.widget.ConstraintLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\n    xmlns:app=\"http:\/\/schemas.android.com\/apk\/res-auto\"\n    xmlns:tools=\"http:\/\/schemas.android.com\/tools\"\n    android:layout_width=\"match_parent\"\n    android:layout_height=\"match_parent\"\n    tools:context=\".MainActivity\">\n\n    <TextView\n        android:layout_width=\"wrap_content\"\n        android:layout_height=\"wrap_content\"\n        android:text=\"Hello World!\"\n        app:layout_constraintBottom_toBottomOf=\"parent\"\n        app:layout_constraintLeft_toLeftOf=\"parent\"\n        app:layout_constraintRight_toRightOf=\"parent\"\n        app:layout_constraintTop_toTopOf=\"parent\" \/>\n\n<\/androidx.constraintlayout.widget.ConstraintLayout><\/code><\/pre>\n\n\n\n
In questo caso la nostra App Android minimale visualizzer\u00e0 una schermata con la scritta : ‘Hello World!’.<\/p>\n\n\n\n
Con l’ambiente di sviluppo ‘Android Studio’ potete generare automaticamente questa applicazione in un minuto.<\/p>\n\n\n\n
Ecco il risultato:<\/p>\n\n\n\n
\"\"
App Android minimale<\/figcaption><\/figure>\n\n\n\n
<\/p>\n","protected":false},"excerpt":{"rendered":"
In questo post vi mostro la struttura minimale di una App Android. In realt\u00e0 potrebbe essere resa ancora pi\u00f9 semplice, ma non chiarirebbe bene quali sono le parti che costituiscono l’App. Iniziamo con il file AndroidManifest.xml (directory app\/manifests) : Passiamo al file che contiene il programma principale dell’App, MainActivity.java (directory app\/java) : Al programma (Activity) … Leggi tutto “A minimal App in Android”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15,7],"tags":[],"class_list":["post-807","post","type-post","status-publish","format-standard","hentry","category-android","category-stem"],"_links":{"self":[{"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/posts\/807","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=807"}],"version-history":[{"count":4,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/posts\/807\/revisions"}],"predecessor-version":[{"id":834,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=\/wp\/v2\/posts\/807\/revisions\/834"}],"wp:attachment":[{"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=807"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=807"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/es-andreabianchini.it\/andrewsblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=807"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}