{"id":3720,"date":"2013-05-18T01:44:29","date_gmt":"2013-05-17T22:44:29","guid":{"rendered":"http:\/\/examples.javacodegeeks.com\/?p=3720"},"modified":"2013-05-19T14:27:16","modified_gmt":"2013-05-19T11:27:16","slug":"android-handler-example","status":"publish","type":"post","link":"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/","title":{"rendered":"Android Handler Example"},"content":{"rendered":"<p>In this example we are going to see how to use Android <a href=\"http:\/\/developer.android.com\/reference\/android\/os\/Handler.html\">Handler<\/a>. As we \u00a0read from the official documentation: a\u00a0Handler allows you to send and process\u00a0<code><a href=\"http:\/\/developer.android.com\/reference\/android\/os\/Message.html\">Message<\/a><\/code>\u00a0and Runnable objects associated with a thread&#8217;s\u00a0<code><a href=\"http:\/\/developer.android.com\/reference\/android\/os\/MessageQueue.html\">MessageQueue<\/a><\/code>. Each Handler instance is associated with a single thread and that thread&#8217;s message queue. When you create a new Handler, it is bound to the thread \/ message queue of the thread that is creating it &#8212; from that point on, it will deliver messages and runnables to that message queue and execute them as they come out of the message queue.<\/p>\n<p>There are two main uses for a Handler:<\/p>\n<ol>\n<li>To schedule messages and runnables to be executed as some point in the future.<\/li>\n<li>To enqueue an action to be performed on a different thread than your own.<\/li>\n<\/ol>\n<p>For this tutorial, we will use the following tools in a Windows 64-bit platform:<\/p>\n<ul>\n<li>JDK 1.7<\/li>\n<li>Eclipse 4.2 Juno<\/li>\n<li>Android SKD 4.2<\/li>\n<\/ul>\n<h3>1. Create a new Android Project<\/h3>\n<p>Open Eclipse IDE and go to File -&gt; New -&gt; Project -&gt; Android -&gt; Android Application Project.\u00a0You have to specify the Application Name, the Project Name and the Package name in the appropriate text fields and then click Next.<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-new-project-attrs2.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3722\" alt=\"create-new-project-attrs\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-new-project-attrs2.jpg\" width=\"563\" height=\"434\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-new-project-attrs2.jpg 563w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-new-project-attrs2-300x231.jpg 300w\" sizes=\"(max-width: 563px) 100vw, 563px\" \/><\/a><\/p>\n<p>In the next window make sure the \u201cCreate activity\u201d option is selected in order to create a new activity for your project, and click Next. This is optional as you can create a new activity after creating the project, but you can do it all in one step.<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/check-create-new-activity6.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3723\" alt=\"check-create-new-activity\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/check-create-new-activity6.jpg\" width=\"563\" height=\"434\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/check-create-new-activity6.jpg 563w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/check-create-new-activity6-300x231.jpg 300w\" sizes=\"(max-width: 563px) 100vw, 563px\" \/><\/a><\/p>\n<p>Select \u201cBlankActivity\u201d and click Next.<\/p>\n<p><a href=\"http:\/\/cdn.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-blanc-activity.jpg\"><img decoding=\"async\" alt=\"create-blanc-activity\" src=\"http:\/\/cdn.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/create-blanc-activity.jpg\" width=\"528\" height=\"502\" \/><\/a><div style=\"display:inline-block; margin: 15px 0;\"> <div id=\"adngin-JavaCodeGeeks_incontent_video-0\" style=\"display:inline-block;\"><\/div> <\/div><\/p>\n<p>You will be asked to specify some information about the new activity. \u00a0In the Layout Name text field you have to specify the name of the file that will contain the layout description of your app. In our case the file\u00a0<code>res\/layout\/main.xml<\/code>\u00a0will be created. Then, click Finish.<\/p>\n<p><a href=\"http:\/\/cdn.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-activity-attr.jpg\"><img decoding=\"async\" alt=\"new-activity-attr\" src=\"http:\/\/cdn.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/new-activity-attr.jpg\" width=\"484\" height=\"455\" \/><\/a><\/p>\n<h3>2. Create the main layout of the Application<\/h3>\n<p>Open\u00a0<code>res\/layout\/main.xml<\/code>\u00a0file :<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-xml5.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3725\" alt=\"main-xml\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-xml5.jpg\" width=\"305\" height=\"505\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-xml5.jpg 305w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-xml5-181x300.jpg 181w\" sizes=\"(max-width: 305px) 100vw, 305px\" \/><\/a><\/p>\n<p>And paste the following code :<\/p>\n<pre class=\"brush:xml\">&lt;?xml version=\"1.0\" encoding=\"utf-8\"?&gt;\r\n&lt;LinearLayout xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"\r\n    android:layout_width=\"match_parent\"\r\n    android:layout_height=\"match_parent\"\r\n    android:orientation=\"vertical\" &gt;\r\n\r\n    &lt;ProgressBar\r\n        android:id=\"@+id\/progressBar1\"\r\n        style=\"?android:attr\/progressBarStyleHorizontal\"\r\n        android:layout_width=\"match_parent\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:indeterminate=\"false\"\r\n        android:max=\"10\"\r\n        android:padding=\"4dip\" &gt;\r\n    &lt;\/ProgressBar&gt;\r\n\r\n    &lt;Button\r\n        android:id=\"@+id\/button1\"\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:onClick=\"startProgress\"\r\n        android:text=\"Start\" &gt;\r\n    &lt;\/Button&gt;\r\n\r\n&lt;\/LinearLayout&gt;<\/pre>\n<p>Now you may open the Graphical layout editor to preview the User Interface you created:<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/graphical-layout-explorer1.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3751\" alt=\"graphical-layout-explorer\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/graphical-layout-explorer1.jpg\" width=\"518\" height=\"554\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/graphical-layout-explorer1.jpg 518w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/graphical-layout-explorer1-280x300.jpg 280w\" sizes=\"(max-width: 518px) 100vw, 518px\" \/><\/a><\/p>\n<h3>3. Code<\/h3>\n<p>Now we have to write the code of the application. Use the Package Explorer to navigate to the Java file of the Activity you\u2019ve created:<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-src-file1.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3727\" alt=\"main-src-file\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-src-file1.jpg\" width=\"453\" height=\"308\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-src-file1.jpg 453w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-src-file1-300x203.jpg 300w\" sizes=\"(max-width: 453px) 100vw, 453px\" \/><\/a><\/p>\n<p>The code of this tutorial is pretty much self\u00a0explanatory. The interesting part is how to update the value of the Progress bar. We are going to use a\u00a0<a href=\"http:\/\/developer.android.com\/reference\/android\/os\/Handler.html\"><code>Handler<\/code><\/a>\u00a0for that. The Handler takes a\u00a0<a href=\"http:\/\/docs.oracle.com\/javase\/7\/docs\/api\/java\/lang\/Runnable.html\">Runnable<\/a>\u00a0object and it schedules its execution; it places the runnable process as a job in an execution queue\u00a0to be run after a specified amount of time. The runnable will be run on the thread to which this handler is attached. In our case the handler is registerd in the main thread.<\/p>\n<pre class=\"brush:java\">package com.javacodegeeks.android.androidhandlerexample;\r\n\r\nimport android.app.Activity;\r\nimport android.os.Bundle;\r\nimport android.os.Handler;\r\nimport android.view.View;\r\nimport android.widget.ProgressBar;\r\n\r\npublic class MainActivity extends Activity {\r\n\r\n\tprivate Handler handler;\r\n\tprivate ProgressBar progressBar;\r\n\r\n\t\/** Called when the activity is first created. *\/\r\n\r\n\t@Override\r\n\tpublic void onCreate(Bundle savedInstanceState) {\r\n\t\tsuper.onCreate(savedInstanceState);\r\n\t\tsetContentView(R.layout.main);\r\n\t\thandler = new Handler();\r\n\t\tprogressBar = (ProgressBar) findViewById(R.id.progressBar1);\r\n\r\n\t}\r\n\r\n\tpublic void startProgress(View view) {\r\n\r\n\t\tnew Thread(new Task()).start();\r\n\t}\r\n\r\n\tclass Task implements Runnable {\r\n\t\t@Override\r\n\t\tpublic void run() {\r\n\t\t\tfor (int i = 0; i &lt;= 20; i++) {\r\n\t\t\t\tfinal int value = i;\r\n\t\t\t\ttry {\r\n\t\t\t\t\tThread.sleep(1000);\r\n\t\t\t\t} catch (InterruptedException e) {\r\n\t\t\t\t\te.printStackTrace();\r\n\t\t\t\t}\r\n\t\t\t\thandler.post(new Runnable() {\r\n\t\t\t\t\t@Override\r\n\t\t\t\t\tpublic void run() {\r\n\t\t\t\t\t\tprogressBar.setProgress(value);\r\n\t\t\t\t\t}\r\n\t\t\t\t});\r\n\t\t\t}\r\n\t\t}\r\n\t}\r\n\r\n}<\/pre>\n<h3>4. Run the application<\/h3>\n<p>This is the main screen of our Application.<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-screen9.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3728\" alt=\"main-screen\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-screen9.jpg\" width=\"256\" height=\"470\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-screen9.jpg 256w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/main-screen9-163x300.jpg 163w\" sizes=\"(max-width: 256px) 100vw, 256px\" \/><\/a><\/p>\n<p>Now, when you press the \u201cStart\u201d button, the <code>Handler<\/code> will launch the thread that updates the bar&#8217;s value :<\/p>\n<p><a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/progress.jpg\"><img decoding=\"async\" class=\"alignnone size-full wp-image-3730\" alt=\"progress\" src=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/progress.jpg\" width=\"256\" height=\"470\" srcset=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/progress.jpg 256w, https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/progress-163x300.jpg 163w\" sizes=\"(max-width: 256px) 100vw, 256px\" \/><\/a><\/p>\n<h3>Download Eclipse Project<\/h3>\n<p>This was an Android HandlerExample. Download the Eclipse Project of this tutorial:\u00a0<a href=\"http:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/AndroidHandlerExample.zip\">AndroidHandlerExample.zip<\/a><a href=\"http:\/\/cdn.javacodegeeks.com\/wp-content\/uploads\/2013\/05\/AndroidTimerExample.zip\"><br \/>\n<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In this example we are going to see how to use Android Handler. As we \u00a0read from the official documentation: a\u00a0Handler allows you to send and process\u00a0Message\u00a0and Runnable objects associated with a thread&#8217;s\u00a0MessageQueue. Each Handler instance is associated with a single thread and that thread&#8217;s message queue. When you create a new Handler, it is &hellip;<\/p>\n","protected":false},"author":4,"featured_media":1202,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[432],"tags":[],"class_list":["post-3720","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-handler"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Android Handler Example - Java Code Geeks<\/title>\n<meta name=\"description\" content=\"In this example we are going to see how to use Android Handler. 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As we \u00a0read from the official documentation: a\u00a0Handler allows you to send and\" \/>\n<meta property=\"og:url\" content=\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/\" \/>\n<meta property=\"og:site_name\" content=\"Examples Java Code Geeks\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/javacodegeeks\" \/>\n<meta property=\"article:published_time\" content=\"2013-05-17T22:44:29+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2013-05-19T11:27:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/android-logo.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"150\" \/>\n\t<meta property=\"og:image:height\" content=\"150\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nikos Maravitsas\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@javacodegeeks\" \/>\n<meta name=\"twitter:site\" content=\"@javacodegeeks\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nikos Maravitsas\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/\"},\"author\":{\"name\":\"Nikos Maravitsas\",\"@id\":\"https:\/\/examples.javacodegeeks.com\/#\/schema\/person\/686a494fbb577a8d1231862b139cda6b\"},\"headline\":\"Android Handler Example\",\"datePublished\":\"2013-05-17T22:44:29+00:00\",\"dateModified\":\"2013-05-19T11:27:16+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/\"},\"wordCount\":495,\"commentCount\":2,\"publisher\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/#organization\"},\"image\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/android-logo.jpg\",\"articleSection\":[\"Handler\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/\",\"url\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/\",\"name\":\"Android Handler Example - Java Code Geeks\",\"isPartOf\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/examples.javacodegeeks.com\/android\/core\/os\/handler\/android-handler-example\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/examples.javacodegeeks.com\/wp-content\/uploads\/2012\/12\/android-logo.jpg\",\"datePublished\":\"2013-05-17T22:44:29+00:00\",\"dateModified\":\"2013-05-19T11:27:16+00:00\",\"description\":\"In this example we are going to see how to use Android Handler. 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