{"id":1174,"date":"2014-11-07T16:29:00","date_gmt":"2014-11-07T08:29:00","guid":{"rendered":"http:\/\/blog.qdac.cc\/?p=1174"},"modified":"2014-11-07T16:29:00","modified_gmt":"2014-11-07T08:29:00","slug":"android%e4%b8%ad%e7%9a%84adapter%e9%80%82%e9%85%8d%e5%99%a8","status":"publish","type":"post","link":"https:\/\/blog.qdac.cc\/?p=1174","title":{"rendered":"Android\u4e2d\u7684Adapter(\u9002\u914d\u5668)"},"content":{"rendered":"<p>\u4f7f\u7528\u8fc7Java\u5f00\u53d1\u5b89\u5353App\u7684\u7ae5\u978b\u80af\u5b9a\u7528\u8fc7ListView\uff0c\u5b83\u7075\u6d3b\u591a\u53d8\u7684\u8bbe\u8ba1\u65b9\u5f0f\u4e0e\u601d\u8def\uff0c\u5bf9\u4e8e\u6211\u8fd9\u6837\u4eceDelphi\u8f6c\u6765\u7684\u4eba\u800c\u8a00\uff0c\u6df1\u6709\u542f\u8fea\u3002\u672c\u6587\u7684\u5fe0\u65e8\u662f\u901a\u8fc7\u4ecb\u7ecdJava\u4e2dAdapter\u7684\u7528\u6cd5\uff0c\u6765\u8ba9\u4e0d\u4e86\u89e3\u8fd9\u65b9\u9762\u7684\u7ae5\u978b\u5b66\u4e60\u5176\u4e2d\u7684\u8bbe\u8ba1\u601d\u60f3\u3002<\/p>\n<p>ListView\u662f\u771f\u6b63\u7684\u6570\u636e\u4e0e\u754c\u9762\u5b8c\u5168\u5206\u79bb\u7684\u8bbe\u8ba1\u601d\u8def\uff0cUI\u7531Android\u6807\u51c6\u7684XML\u65b9\u5f0f\u968f\u610f\u642d\u914d\uff0c\u5b9a\u5236\u663e\u5f0f\u6548\u679c\uff0c\u8fd9\u79cdUI\u8bbe\u8ba1\u601d\u60f3\uff0c\u786e\u5b9e\u5f88\u5148\u8fdb\u3002\u4e0d\u8fc7\u672c\u6587\u4e3b\u8981\u8bb2\u7684\u662f\u6570\u636e\u9002\u914d\u5668\uff08Adapter\uff09\uff0c\u6240\u4ee5UI\u65b9\u9762\u4e0b\u56de\u6709\u673a\u4f1a\u518d\u8bf4\u3002<\/p>\n<p>\u5728Android\u5f00\u53d1\u4e2d\uff08java\uff09\uff0c\u6bcf\u4e2aListView\u90fd\u6709\u81ea\u5df1\u7684Adapter\u3002ListView\u8981\u663e\u793a\u4ec0\u4e48\u5185\u5bb9\uff0c\u5b8c\u5168\u7531\u8fd9\u4e2a\u6570\u636e\u9002\u914d\u5668\u63a7\u5236\u3002ADK\u4e3a\u6570\u636e\u9002\u914d\u5668\u89c4\u5b9a\u4e86\u6807\u51c6\u7684\u63a5\u53e3BaseAdapter\uff0c\u5b83\u89c4\u5b9a\u4e86\u9700\u8981\u7528\u5230\u7684\u6807\u51c6\u63a5\u53e3\uff0c\u6211\u4eec\u5728\u5f00\u53d1\u4e2d\uff0c\u53ea\u9700\u8981<span class=\"web-item\">\u7ee7\u627f<\/span>(extends\uff09BaseAdapter\u4ea7\u751f\u4e00\u4e2a\u65b0\u7c7b\uff0c\u5c31\u53ef\u4ee5\u5728\u91cc\u9762\u5199\u81ea\u5df1\u7684\u4ee3\u7801\u4e86\u3002\u4e0b\u9762\u6211\u8d34\u51fa\u4e00\u4e2a\u57fa\u672c\u7684\u53ef\u4ee5\u7528\u6765\u663e\u793a\u5b57\u7b26\u4e32\u5217\u8868\u7684Adapter:<\/p>\n<pre class=\"lang:java decode:true\">\t\/**\r\n\t * \u6570\u636e\u9002\u914d\u5668\r\n\t * @author YangYxd\r\n\t *\/\r\n\tpublic class ListViewAdapter extends BaseAdapter{\r\n\t\tprotected LayoutInflater mInflater; \r\n\t\tprivate List&lt;String&gt; list;\r\n\r\n\t\tpublic ListViewAdapter(Context context, List&lt;String&gt; list) {\r\n\t\t\tthis.mInflater = LayoutInflater.from(context); \r\n\t\t\tthis.list = list;\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic int getCount() {\r\n\t\t\treturn list.size();\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic Object getItem(int position) {\r\n\t\t\treturn list.get(position);\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic long getItemId(int position) {\r\n\t\t\treturn position;\r\n\t\t}\r\n\r\n\t\t@Override\r\n\t\tpublic View getView(int position, View convertView, ViewGroup parent) {\r\n        ...\r\n\t\t    return convertView; \r\n\t\t}\t\r\n\t}<\/pre>\n<p>\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u662f\u4e00\u4e2a\u6700\u7b80\u5355\u7684\u81ea\u5b9a\u4e49Adapter\uff0c\u5b9e\u73b0\u4e86\u6700\u4e3b\u8981\u7684\u63a5\u53e3\uff1agetCount()\u3001getItem()\u3001getItemId()\u548cgetView()\u3002\u6765\u770b\u770b\u8fd9\u51e0\u4e2a\u4e3b\u8981\u63a5\u53e3\u7684\u4f5c\u7528\uff1a<\/p>\n<ul>\n<li>getCount()\uff1a\u8fd4\u56de\u6570\u636e\u7684\u884c\u6570\u3002\u5c31\u662f\u7531\u5b83\u6765\u63a7\u5236ListView\u663e\u793a\u7684\u6570\u636e\u4e00\u5171\u6709\u51e0\u6761\u3002<\/li>\n<li>getItem(): \u83b7\u53d6\u4e00\u4e2aItem\u3002\u5728\u4f7f\u7528lstView.getItemAtPosition(position)\u8fd9\u6837\u7684\u529f\u80fd\u65f6\uff0c\u4f1a\u8c03\u7528getItem()\u8fd4\u56de\u5177\u4f53\u7684\u6570\u636e\u3002<\/li>\n<li>getItemId(): \u83b7\u53d6\u4e00\u4e2aItem\u7684ID\u3002\u548cgetItem()\u7c7b\u4f3c\u7528\u9014\uff0c\u53ea\u4e0d\u8fc7\u5b83\u4e00\u822c\u7528\u6765\u8fd4\u56de\u6570\u636e\u7684ID\u5b57\u6bb5\u3002\u5b9e\u9645\u5f00\u53d1\u4e2d\uff0c\u5f80\u5f80\u76f4\u63a5\u8fd4\u56deposition\uff0c\u4e5f\u5c31\u662f\u7d22\u5f15\u53f7\u3002<\/li>\n<li>getView()\uff1a\u8fd9\u4e2a\u662f\u91cd\u4e2d\u4e4b\u91cd\u4e86\u3002\u7531\u5b83\u6765\u6307\u5b9aListView\u4e2d\u6bcf\u4e00\u884c\u7684\u6570\u636e\u5230\u5e95\u600e\u4e48\u663e\u793a\u3002\u4e0b\u9762\u6211\u4eec\u8be6\u7ec6\u7684\u8bf4\u8bf4getView\u3002<\/li>\n<\/ul>\n<p>\u7ecf\u5e38\u5728\u81ea\u5b9a\u4e49Adapter\u65f6\uff0c\u4f1a\u6709\u7c7b\u4f3c\u4e0b\u9762\u7684getView()\uff1a<\/p>\n<p>&nbsp;<\/p>\n<pre class=\"lang:java decode:true\">\/** \u89c6\u56fe\u6240\u6709\u8005 *\/\r\npublic static class ListViewHolder{\r\n  public TextView tvTitle;\r\n}<\/pre>\n<p>&nbsp;<\/p>\n<pre class=\"lang:java decode:true\">@Override\r\npublic View getView(int position, View convertView, ViewGroup parent) {\r\n  ListViewHolder holder = null; \r\n  final String value = list.get(position);\r\n\r\n  if (convertView != null &amp;&amp; convertView.getTag() != null) \r\n    holder = (ListViewHolder)convertView.getTag();\r\n\r\n  if (holder == null) {\r\n      holder = new ListViewHolder(); \r\n      convertView = mInflater.inflate(R.layout.lst_item_view, null); \/\/ \u52a0\u8f7d\u4e00\u4e2aXML\u754c\u9762\r\n\u00a0\u00a0 \u00a0\u00a0 holder.tvTitle = (LinearLayout) convertView.findViewById(R.id.tvTitle);\t\/\/ \u5f97\u5230tvTitle\u8fd9\u4e2a\u63a7\u4ef6\u7528\u4e8e\u663e\u793a\u6587\u672c\t    \r\n      convertView.setTag(holder);\r\n  }\r\n  holder.tvTitle.setText(value);\r\n  return convertView; \r\n}\t\r\n<\/pre>\n<p>lst_item_view.xml:<\/p>\n<pre class=\"lang:java decode:true\">&lt;LinearLayout \r\n  android:orientation=\"vertical\" \r\n  android:layout_width=\"fill_parent\"\r\n  android:layout_height=\"fill_parent\"\r\n  xmlns:android=\"http:\/\/schemas.android.com\/apk\/res\/android\"&gt;\r\n\r\n    &lt;TextView\r\n        android:id=\"@+id\/tvTitle\"\r\n        android:layout_width=\"wrap_content\"\r\n        android:layout_height=\"wrap_content\"\r\n        android:layout_marginLeft=\"4dp\"\r\n        android:layout_marginRight=\"8dp\"\r\n        android:background=\"@drawable\/chatfrom_bg\" \/&gt;\r\n\r\n&lt;\/LinearLayout&gt;<\/pre>\n<p>\u5b8c\u6210\u4e86ListViewAdapter\uff0c\u53ea\u9700\u8981new\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u7136\u540e<\/p>\n<pre class=\"lang:java decode:true \">adapter = new ListViewAdapter(context);\r\nlstView.setAdapter(adapter);<\/pre>\n<p>\u8fd9\u6837\uff0cListView\u5c31\u53ef\u4ee5\u4f7f\u7528\u6211\u4eec\u7684\u6570\u636e\u9002\u914d\u5668\u663e\u793a\u5185\u5bb9\u4e86\u3002 \u4e0a\u9762\u7684\u8fd9\u6bb5getView()\u4ee3\u7801\u8fd8\u5e94\u7528\u4e86\u7f13\u5b58\u6280\u672f\uff0c\u907f\u514d\u6bcf\u6b21\u90fd\u53bb\u52a0\u8f7dXML\u548c\u83b7\u53d6tvTitle\u3002\u5b9e\u9645\u4e0a\u5728getView\u53ef\u4ee5\u5f88\u590d\u6742\uff0c\u6bd4\u5982Item\u4e0d\u518d\u662f\u4e00\u4e2a\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u4e00\u4e2a\u7c7b\uff0c\u7c7b\u4e2d\u5305\u542b\u4e86\u5404\u79cd\u6570\u636e\uff0c\u5982\u5927\u5c0f\uff0c\u91d1\u989d\u7b49\u3002\u8fd8\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684Item\uff0c\u8fd4\u56de\u4e0d\u540c\u7684convertView\uff0c\u505a\u51fa\u4e00\u4e2aListView\u663e\u793a\u591a\u79cd\u6548\u679c\u7684\u6837\u5b50\uff0c\u5982Android QQ\u7684\u201c\u6211\u201d\u680f\u76ee\uff0c\u4e0a\u9762\u662f\u529f\u80fd\uff0c\u4e0b\u9762\u662f\u6570\u636e\u7b49\u3002<br \/>\n\u9664\u4e86ListView\uff0c\u5728\u4f7f\u7528Java\u8fdb\u884cAndroid\u5f00\u53d1\u4e2d\uff0c\u5f88\u591a\u5730\u65b9\u90fd\u7528\u4e86\u6570\u636e\u9002\u914d\u5668\u65b9\u5f0f\u3002\u6570\u636e\u4e0eUI\u5b8c\u5168\u5206\u79bb\uff0c\u8ba9\u7a0b\u5e8f\u53d8\u5f97\u5f88\u7075\u6d3b\uff0cUI\u90e8\u5206\u4e0d\u9700\u8981\u5360\u7528\u5185\u5b58\u53bb\u5b58\u653e\u6570\u636e\uff0c\u5904\u7406\u6570\u636e\u7684\u4ee3\u7801\u4e5f\u53ef\u4ee5\u4e13\u5fc3\u7684\u5904\u7406\u6570\u636e\u800c\u4e0d\u53bb\u7ba1UI\u600e\u4e48\u663e\u793a\u3002\u5728\u6570\u636e\u53d8\u5316\u540e\uff0c\u53ea\u9700\u8981\u9002\u65f6\u7684\u8c03\u7528\u4e00\u4e0bnotifyDataSetChanged()\u51fd\u6570\u754c\u9762\u5c31\u4f1a\u66f4\u65b0\u663e\u793a\u4e86\u3002<br \/>\n\u4e0a\u9762\u8bf4\u4e86\u5728Java\u4e2dAdapter\u7684\u57fa\u672c\u529f\u80fd\u4e0e\u7528\u6cd5\uff0c\u73a9Delphi\u7684\u7ae5\u978b\u53ef\u80fd\u5df2\u7ecf\u53d1\u73b0\u4e86\uff0c\u5b83\u548c\u6211\u4eec\u7684ListBox\u5c06Style\u8bbe\u7f6e\u6210lbVirtualOwnerDraw\u65f6\u539f\u7406\u5dee\u4e0d\u591a\u3002\u4e0d\u8fc7ADK\u505a\u7684\u66f4\u52a0\u6210\u719f\uff0c\u66f4\u52a0\u5b9e\u7528\u4e86\u3002\u5b83\u7684\u8bbe\u8ba1\u601d\u60f3\uff0c\u5f88\u503c\u5f97\u6211\u4eec\u5b66\u4e60\u3002<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528\u8fc7Java\u5f00\u53d1\u5b89\u5353App\u7684\u7ae5\u978b\u80af\u5b9a\u7528 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[145,21],"tags":[163,164],"class_list":["post-1174","post","type-post","status-publish","format-standard","hentry","category-android","category-misc","tag-adapter","tag-java"],"views":4867,"_links":{"self":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1174","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1174"}],"version-history":[{"count":1,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1174\/revisions"}],"predecessor-version":[{"id":1175,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=\/wp\/v2\/posts\/1174\/revisions\/1175"}],"wp:attachment":[{"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1174"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1174"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.qdac.cc\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1174"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}