{"id":17778,"date":"2022-10-27T02:33:25","date_gmt":"2022-10-26T21:03:25","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-android-java-errornull-pointer-exception-cant-see-why\/"},"modified":"2022-10-27T02:33:25","modified_gmt":"2022-10-26T21:03:25","slug":"solved-android-java-errornull-pointer-exception-cant-see-why","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-android-java-errornull-pointer-exception-cant-see-why\/","title":{"rendered":"[Solved] Android Java error:null pointer exception can&#8217;t see why?"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-24324430\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"24324430\" data-parentid=\"24323982\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>You have referenced in Your LoadingMain activity the following layout with setContentView:<\/p>\n<pre><code>   setContentView(R.layout.loading_main);\n<\/code><\/pre>\n<p>But this Layout does not have any button1. Instead, You are trying to reference a button from another layout, from activity_main.xml<\/p>\n<pre><code>   btnStartProgress = (Button) findViewById(R.id.button1);\n<\/code><\/pre>\n<p>This button1 is inside the activity_main.xml and You cannot reference a button in a layout that is not attached per setContentView. So What You have to do is, add a button to the loading_main.xml, BUT, don\u00b4t give it the same id like in the activity main &#8220;button1&#8243;. Sure, it works, to give same ids as long as the right layout is referenced, but id\u00b4s should be unique. If the button in the activity_layout should remain, give the id for your button inside loading_main.xml another name, maybe android:id=&#8221;@+id\/loading_main_button_1&#8221;.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">2<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Android Java error:null pointer exception can&#8217;t see why? <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] You have referenced in Your LoadingMain activity the following layout with setContentView: setContentView(R.layout.loading_main); But this Layout does not have any button1. Instead, You are trying to reference a button from another layout, from activity_main.xml btnStartProgress = (Button) findViewById(R.id.button1); This button1 is inside the activity_main.xml and You cannot reference a button in a layout that &#8230; <a title=\"[Solved] Android Java error:null pointer exception can&#8217;t see why?\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-android-java-errornull-pointer-exception-cant-see-why\/\" aria-label=\"More on [Solved] Android Java error:null pointer exception can&#8217;t see why?\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[452,323],"class_list":["post-17778","post","type-post","status-publish","format-standard","hentry","category-solved","tag-android","tag-java"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Solved] Android Java error:null pointer exception can&#039;t see why? - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-android-java-errornull-pointer-exception-cant-see-why\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Android Java error:null pointer exception can&#039;t see why? - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] You have referenced in Your LoadingMain activity the following layout with setContentView: setContentView(R.layout.loading_main); But this Layout does not have any button1. 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Instead, You are trying to reference a button from another layout, from activity_main.xml btnStartProgress = (Button) findViewById(R.id.button1); This button1 is inside the activity_main.xml and You cannot reference a button in a layout that ... 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