{"id":33472,"date":"2023-02-08T13:49:25","date_gmt":"2023-02-08T08:19:25","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-onclicklistener-of-listview-items-for-good-performance-avoiding-slow-scrolling\/"},"modified":"2023-02-08T13:49:25","modified_gmt":"2023-02-08T08:19:25","slug":"solved-how-to-implement-onclicklistener-of-listview-items-for-good-performance-avoiding-slow-scrolling","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-how-to-implement-onclicklistener-of-listview-items-for-good-performance-avoiding-slow-scrolling\/","title":{"rendered":"[Solved] How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling)"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-21878784\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"21878784\" data-parentid=\"21878384\" data-score=\"2\" 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>It&#8217;s better to use a <em>Wrapper<\/em> to access to your <code>View<\/code> and to define your <code>OnClickListener<\/code> earlier (and <em>outside the adapter<\/em> for a better usability).<\/p>\n<p>The following sample show how to handle 2 <em>clickable<\/em> <code>View<\/code> on one single item of the <code>ListView<\/code> with good performance:   <\/p>\n<pre><code>public class ItemAdapter extends BaseAdapter {\n\n    private List&lt;Item&gt; items;\n    private ItemWrapper wrapper = null;\n    private OnClickListener onMyItemClickListener1;\n    private OnClickListener onMyItemClickListener2;\n\n    public ItemAdapter(Context context, List&lt;Item&gt; items, OnClickListener onMyItemClickListener1, OnClickListener onMyItemClickListener2) {\n        this.inflater = LayoutInflater.from(context);\n        this.items = items;\n        this.onMyItemClickListener1 = onMyItemClickListener1;\n        this.onMyItemClickListener2 = onMyItemClickListener2;\n    }        \n\n    @Override\n    public int getCount() {\n        return items.size();\n    }\n\n    @Override\n    public Object getItem(int position) {\n        return items.get(position);\n    }\n\n    @Override\n    public long getItemId(int position) {\n        return position;\n    }\n\n    @Override\n    public synchronized View getView(int position, View convertView, ViewGroup parent) {\n        View row = convertView;\n\n        if (row == null) {\n            row = inflater.inflate( R.layout.item, null);\n            wrapper = new ItemWrapper(row);\n            row.setTag(wrapper);\n        } else {\n            wrapper = (ItemWrapper)row.getTag();\n        }\n\n        Item item = getItem(position);\n        wrapper.getClickView1().setOnClickListener(onMyItemClickListener1);\n        wrapper.getClickView2().setOnClickListener(onMyItemClickListener2);\n        return(row);\n    }        \n}\n\npublic class ItemWrapper {\n    private View baseView;\n    private View clickView1;\n    private View clickView2;\n\n    public ItemWrapper(View baseView) {\n        this.baseView = baseView;\n    } \n\n    public View getClickView1() {\n        if ( clickView1 == null) {\n            clickView1 = (View)baseView.findViewById(R.id.clickView1);\n        }\n\n        return(clickView1);\n    }  \n\n    public View getClickView2() {\n        if ( clickView2 == null) {\n            clickView2 = (View)baseView.findViewById(R.id.clickView2);\n        }\n\n        return(clickView2);\n    }\n}\n<\/code><\/pre>\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 How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling) <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] It&#8217;s better to use a Wrapper to access to your View and to define your OnClickListener earlier (and outside the adapter for a better usability). The following sample show how to handle 2 clickable View on one single item of the ListView with good performance: public class ItemAdapter extends BaseAdapter { private List&lt;Item&gt; items; &#8230; <a title=\"[Solved] How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling)\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-how-to-implement-onclicklistener-of-listview-items-for-good-performance-avoiding-slow-scrolling\/\" aria-label=\"More on [Solved] How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling)\">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":[1943],"class_list":["post-33472","post","type-post","status-publish","format-standard","hentry","category-solved","tag-android-listview"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling) - 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-how-to-implement-onclicklistener-of-listview-items-for-good-performance-avoiding-slow-scrolling\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] How to implement OnClickListener of ListView items for good performance (avoiding slow scrolling) - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] It&#8217;s better to use a Wrapper to access to your View and to define your OnClickListener earlier (and outside the adapter for a better usability). The following sample show how to handle 2 clickable View on one single item of the ListView with good performance: public class ItemAdapter extends BaseAdapter { private List&lt;Item&gt; items; ... 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