{"id":23420,"date":"2015-07-23T00:11:40","date_gmt":"2015-07-22T18:41:40","guid":{"rendered":"http:\/\/www.tothenew.com\/blog\/?p=23420"},"modified":"2015-07-23T10:45:04","modified_gmt":"2015-07-23T05:15:04","slug":"creating-android-application-with-groovy","status":"publish","type":"post","link":"https:\/\/www.tothenew.com\/blog\/creating-android-application-with-groovy\/","title":{"rendered":"Creating Android Application with Groovy"},"content":{"rendered":"

Groovy 2.4 was released in January 2015, with native support for Android development<\/a>. It allows to write Android applications fully using Groovy.<\/p>\n

Running Groovy on Android<\/strong><\/p>\n

Step 1:<\/strong> Create a new Android project in Android Studio<\/p>\n

Step 2:<\/strong> Open this build.gradle (Module: app)<\/strong> file:
\nInsert the following code before the first line:<\/p>\n

[java]buildscript {
\n repositories {
\n jcenter()
\n }
\n dependencies {
\n classpath ‘com.android.tools.build:gradle:1.1.0’
\n classpath ‘org.codehaus.groovy:gradle-groovy-android-plugin:0.3.6’
\n }
\n }[\/java]<\/p>\n

Insert the following code after the “apply plugin:’com.android.application'” <\/strong>line:<\/p>\n

[java]apply plugin: ‘groovyx.grooid.groovy-android'[\/java]<\/p>\n

Finally, near the end of the gradle script, insert a line in dependencies:<\/p>\n

[java]compile ‘org.codehaus.groovy:groovy:2.4.1:grooid'[\/java]<\/p>\n

After changing the gradle file, gradle needs to be “sync”ed.<\/p>\n

Step 3:<\/strong> You will now create an additional “Java Folder” below main<\/strong>. Use New->Folder->Java Folder instead of New->Directory
\nThe name in the entry field is src\/main\/groovy<\/strong>.
\nNote:<\/strong> Groovy code files need to be placed in src\/main\/groovy instead of src\/main\/java. Adding Groovy files to src\/main\/java will not work!<\/p>\n

Step 4:<\/strong> Create a new, MainActivity<\/strong>, with the context menu of the groovy folder, and enter the name of this class fully qualified with the package name.<\/p>\n

Step 5:<\/strong> MainActivity class can be migrated from .java to .groovy by choosing Refactor->Rename File<\/strong> from the context menu. The file extension .java is simply replaced with a .groovy extension.<\/p>\n

Step 6:<\/strong> Give the “Hello World” text view an id in the res\/layout\/activity_main.xml<\/strong> file, like this:<\/p>\n

[java]<TextView
\nandroid:id="@+id\/textview_hello"
\nandroid:layout_width="wrap_content"
\nandroid:layout_height="wrap_content"
\nandroid:text="@string\/hello_world"\/>
\n[\/java]<\/p>\n

Step 7:<\/strong> In MainActivity.groovy, programmatically change the text shown by this view using groovy’s string interpolation:<\/p>\n

[java]public class MainActivity extends Activity {<\/p>\n

@Override
\n protected void onCreate(Bundle savedInstanceState) {
\n super.onCreate(savedInstanceState);
\n setContentView(R.layout.activity_main)
\n int id = R.id.textview_hello
\n findViewById(id).text = "Hello Groovy"
\n }
\n}[\/java]<\/p>\n

Step 8:<\/strong> Build and execute the application.<\/p>\n

It is very easy to run Groovy on Android. Because of Groovy’s interoperability with Java, it is also very easy to mix Groovy and Java in the same application.<\/p>\n

Happy groovy’ing!<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Groovy 2.4 was released in January 2015, with native support for Android development. It allows to write Android applications fully using Groovy. Running Groovy on Android Step 1: Create a new Android project in Android Studio Step 2: Open this build.gradle (Module: app) file: Insert the following code before the first line: [java]buildscript { repositories […]<\/p>\n","protected":false},"author":167,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"iawp_total_views":32},"categories":[518,1772,1],"tags":[4845,1503,9],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/23420"}],"collection":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/users\/167"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/comments?post=23420"}],"version-history":[{"count":0,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/posts\/23420\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/media?parent=23420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/categories?post=23420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tothenew.com\/blog\/wp-json\/wp\/v2\/tags?post=23420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}