{"id":221,"date":"2016-08-25T14:48:46","date_gmt":"2016-08-25T06:48:46","guid":{"rendered":"http:\/\/www.prayerlaputa.com\/?p=221"},"modified":"2016-08-25T14:48:46","modified_gmt":"2016-08-25T06:48:46","slug":"android-gridview%e4%b8%8d%e4%bd%bf%e7%94%a8viewholder%e7%9b%b4%e6%8e%a5%e6%b7%bb%e5%8a%a0view%e5%af%bc%e8%87%b4%e4%b9%b1%e5%ba%8f%e3%80%81%e9%87%8d%e5%a4%8d%e5%93%8d%e5%ba%94%e7%9a%84%e8%a7%a3","status":"publish","type":"post","link":"http:\/\/prayerlaputa.com\/?p=221","title":{"rendered":"android gridview\u4e0d\u4f7f\u7528viewholder\u76f4\u63a5\u6dfb\u52a0view\u5bfc\u81f4\u4e71\u5e8f\u3001\u91cd\u590d\u54cd\u5e94\u7684\u89e3\u51b3\u65b9\u6cd5"},"content":{"rendered":"<p>\u8981\u5b9e\u73b0\u53ef\u62d6\u52a8\u7684\u4e5d\u5bab\u683c\uff0c\u7f51\u4e0a\u641c\u4e86\u4e0b\uff0c\u641c\u5230\u6bd4\u8f83\u9760\u8c31\u7684\u662f<a href=\"http:\/\/blog.csdn.net\/xiaanming\/article\/details\/17718579\">\u8fd9\u4e2a\u7248\u672c<\/a>\uff0c\u539f\u7406\u3001\u5b9e\u73b0\u90fd\u5199\u7684\u5f88\u6e05\u695a\uff0c\u4f46\u6709\u4e2a\u95ee\u9898\uff0c\u7528\u5230GridView\u65f6\uff0c\u5199adapter\u65f6\u4e00\u822c\u90fd\u4f1a\u4f7f\u7528ViewHolder\u7684\u65b9\u5f0f\uff0c\u5373adapter\u4f7f\u7528BaseAdapter\uff0cadapter\u4e2d\u4fdd\u5b58\u6570\u636e\uff0c\u800c\u8c03\u7528getView\u65b9\u6cd5\u65f6\uff0c\u82e5\u662f\u7b2c\u4e00\u6b21\u8c03\u7528\u5219\u5c06\u53ef\u590d\u7528\u7684\u6570\u636e\u4fdd\u5b58\u5230\u4e00\u4e2aViewHolder\u7c7b\u4e2d\uff0c\u540e\u7eed\u5c31\u4e0d\u7528\u518d\u91cd\u65b0\u521b\u5efaView\uff1b\u6216\u8005\uff0cadapter\u4e2d\u6bcf\u6b21\u6839\u636e\u6570\u636e\u521b\u5efaview\u3002<br \/>\n\u7531\u4e8e\u516c\u53f8\u6240\u7528\u7684\u5ba2\u6237\u7aef\u6846\u67b6\u9650\u5236\uff0c\u6211\u5728\u5b9e\u73b0\u53ef\u62d6\u52a8\u7684\u4e5d\u5bab\u683c\u65f6\uff0c\u5728getView\u65b9\u6cd5\u4e2d\uff0c\u62ff\u5230\u7684\u6570\u636e\u5c31\u662f\u4e00\u4e2a\u4e2a\u5df2\u7ecf\u521b\u5efa\u597d\u7684View\u5bf9\u8c61\uff0c\u4f46\u6309\u7167\u4e0a\u9762\u63d0\u5230\u7684<a href=\"http:\/\/blog.csdn.net\/xiaanming\/article\/details\/17718579\">xiaanming<\/a>\u7684\u62d6\u52a8\u5b9e\u73b0\u65b9\u5f0f\uff0c\u6211\u5c06\u8fd9\u4e9b\u5df2\u6709\u7684View\u5bf9\u8c61\u5728getView\u4e2d\u8fd4\u56de\u3001\u52a0\u5165\u5230GridView\u540e\uff0c\u53d1\u73b0\u663e\u793a\u6ca1\u95ee\u9898\uff0c\u4f46\u662f\u62d6\u52a8\u4e4b\u540e\uff0cView\u7684\u663e\u793a\u987a\u5e8f\u4f1a\u4e71\u6389\uff0c\u800c\u4e14\u4f1a\u51fa\u73b0\u7b2c\u4e00\u6b21\u70b9\u51fb\u67d0\u4e2aView\u65f6\u5bf9\u5e94\u56de\u8c03\u65b9\u6cd5\u6ca1\u6709\u54cd\u5e94\uff0c\u4f46\u7b2c\u4e8c\u6b21\u70b9\u51fb\u65f6\u5219\u4f1a\u54cd\u5e94\u7b2c\u4e00\u6b21\u70b9\u51fb\u3001\u7b2c\u4e8c\u6b21\u70b9\u51fb\u4e24\u4e2a\u56de\u8c03\u65b9\u6cd5\u3002<br \/>\n\u4e3a\u89e3\u51b3\u8fd9\u95ee\u9898\uff0c\u5728github\u4e0a\u53d1\u73b0\u5982\u4e0b<a href=\"https:\/\/github.com\/askerov\/DynamicGrid\">\u53ef\u62d6\u52a8\u4e5d\u5bab\u683c\u7684\u53e6\u4e00\u79cd\u5b9e\u73b0<\/a>\uff0c\u5c1d\u8bd5\u91cd\u5199adapter\u7c7b\u540e\u89e3\u51b3\u4e86\u8be5\u95ee\u9898\uff0c\u53d1\u73b0\u8fd9\u4e2a\u8ddfstableid\u6709\u5173\u3002\u6211\u4e00\u5f00\u59cb\u5199\u7684adapter\u5927\u6982\u6837\u5b50\u5982\u4e0b\uff1b<!--more--><\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\npublic class GridAdapter extends BaseAdapter{\nList&lt;View&gt; viewList;\n...\/\/init opertation\n@Override\npublic int getCount() {\n\/\/ TODO Auto-generated method stub\nreturn viewList.size();\n}\n@Override\npublic Object getItem(int position) {\n\/\/ TODO Auto-generated method stub\nreturn viewList.get(position);\n}\n@Override\npublic long getItemId(int position) {\n\/\/ TODO Auto-generated method stub\nreturn position;\n}\n@Override\npublic View getView(int position, View convertView, ViewGroup parent) {\n\/\/ TODO Auto-generated method stub\nreturn viewList.get(position);\n}\npublic void reorder(){\n\/\/reorder view list\n}\n<\/pre>\n<p>\u8fd9\u79cd\u5199\u6cd5\u5bf9\u4e8eViewHolder\u65b9\u5f0f\u6216\u662f\u6bcf\u6b21\u521b\u5efa\u65b0View\u653e\u7684\u65b9\u5f0f\u5b9e\u73b0adapter\u6765\u8bf4\uff0c\u6ca1\u6709\u4efb\u4f55\u95ee\u9898\uff0c\u4f46\u7531\u4e8e\u6211\u76f4\u63a5\u4f7f\u7528\u73b0\u6709\u7684View\u5bf9\u8c61\uff0c\u800cGridView\u672c\u8eab\u53c8\u6709\u7f13\u5b58\u673a\u5236\uff0c\u5bfc\u81f4GridView\u91cd\u7528View\u5bf9\u8c61\u65f6View\u7684\u987a\u5e8f\u548c\u6211\u5df2\u7ecf\u521b\u5efa\u7684viewList\u4e0d\u4e00\u81f4\uff0c\u4e3a\u89e3\u51b3\u8fd9\u4e00\u95ee\u9898\uff0c\u5c31\u5f97\u8bf4\u4e0bgetItemId(int pos)\u65b9\u6cd5\u548chasStableIds()\u65b9\u6cd5\uff0c\u53ef\u4ee5\u53c2\u8003<a href=\"http:\/\/blog.csdn.net\/heng615975867\/article\/details\/16944343\">\u8fd9\u4e2a\u5e16\u5b50<\/a>\uff0c\u5f15\u7528\u4e00\u4e0b\u4eba\u5bb6\u7684\u8bdd\uff1a<\/p>\n<blockquote><p>getItemId\u662f\u5e72\u561b\u7528\u7684\uff1f\u5728\u8c03\u7528 invalidateView()\u65f6\uff0cListView\u4f1a\u5237\u65b0\u663e\u793a\u5185\u5bb9\u3002\u5982\u679c\u5185\u5bb9\u7684id\u662f\u6709\u6548\u7684\uff0c\u7cfb\u7edf\u4f1a\u8ddf\u636eid\u6765\u786e\u5b9a\u5f53\u524d\u663e\u793a\u54ea\u6761\u5185\u5bb9\uff0c\u4e5f\u5c31\u662ffirstVisibleChild\u7684\u4f4d\u7f6e\u3002id\u662f\u5426\u6709\u6548\u901a\u8fc7hasStableIds()\u786e\u5b9a\u3002<\/p><\/blockquote>\n<p>\u6211\u7684\u7406\u89e3\u662f\uff0c\u5728BaseAdapter\u4e2d\uff0chasStableIds()\u65b9\u6cd5\u9ed8\u8ba4\u8fd4\u56defalse\uff0c\u610f\u601d\u662f\u6bcf\u4e2aitem\u5143\u7d20\u7684id\u4e0d\u7a33\u5b9a\uff0c\u4f1a\u6839\u636eitem\u4f4d\u7f6e\u6765\u786e\u5b9aid\uff1b\u5982\u679c\u8fd4\u56detrue\uff0c\u8868\u793a\u6bcf\u4e2aitem\u5143\u7d20\u7684id\u662f\u7a33\u5b9a\u7684\uff0c\u5373\u76f8\u540c\u7684id\u5f15\u7528\u76f8\u540c\u7684\u5bf9\u8c61\u3002\u8fd9\u662f\u56e0\u4e3a\u9ed8\u8ba4id\u4e0d\u7a33\u5b9a\uff0c\u5bfc\u81f4\u6211\u4e0a\u9762\u5199\u7684adapter\u5728\u8fdb\u884c\u62d6\u62fd\u64cd\u4f5c\u540e\uff0citem\u5143\u7d20\uff08view\u5bf9\u8c61\uff09\u4f4d\u7f6e\u53d8\u4e86\uff0c\u4f46\u5176id\u5e76\u6ca1\u6709\u4e0e\u6211\u5728\u91cd\u6392\u5217viewList\u65f6\u4e00\u81f4\uff0c\u5bfc\u81f4\u5f88\u53e4\u602a\u7684\u4e71\u5e8f\u6216\u662f\u91cd\u590d\u54cd\u5e94\u95ee\u9898\u3002\u53c2\u8003<a href=\"https:\/\/github.com\/askerov\/DynamicGrid\">\u53ef\u62d6\u52a8\u4e5d\u5bab\u683c\u7684\u53e6\u4e00\u79cd\u5b9e\u73b0<\/a>\u00a0\u540e\uff0c\u4fee\u6539adapter\u5b9e\u73b0\u5982\u4e0b\uff1a<\/p>\n<pre class=\"brush: java; title: ; notranslate\" title=\"\">\nprivate HashMap&lt;Object, Integer&gt; mIdMap = new HashMap&lt;Object, Integer&gt;();\nprivate ArrayList&lt;Object&gt; mItems = new ArrayList&lt;Object&gt;();\npublic ArrayList&lt;Object&gt; getItemList(){\nreturn mItems;\n}\n@Override\npublic final boolean hasStableIds() {\nreturn true;\n}\n\/**\n* creates stable id for object\n* @param item\n*\/\nprotected void addStableId(Object item) {\nmIdMap.put(item, nextStableId++);\n}\n\/**\n* create stable ids for list\n* @param items\n*\/\nprotected void addAllStableId(List&lt;?&gt; items) {\nfor (Object item : items) {\naddStableId(item);\n}\n}\n\/**\n* clear stable id map.\n* should called when clear adapter data.\n*\/\nprotected void clearStableIdMap() {\nmIdMap.clear();\n}\n\/**\n* remove stable id for item.\n* should called on remove data item from adapter.\n* @param item\n*\/\nprotected void removeStableID(Object item) {\nmIdMap.remove(item);\n}\nprivate void init(List&lt;?&gt; items) {\naddAllStableId(items);\nthis.mItems.addAll(items);\n}\npublic void set(List&lt;?&gt; items) {\nclear();\ninit(items);\nnotifyDataSetChanged();\n}\npublic void clear() {\nclearStableIdMap();\nmItems.clear();\nnotifyDataSetChanged();\n}\npublic void add(Object item) {\naddStableId(item);\nmItems.add(item);\nnotifyDataSetChanged();\n}\npublic void add(int position, Object item) {\naddStableId(item);\nmItems.add(position, item);\nnotifyDataSetChanged();\n}\npublic void add(List&lt;?&gt; items) {\naddAllStableId(items);\nthis.mItems.addAll(items);\nnotifyDataSetChanged();\n}\npublic void remove(Object item) {\nmItems.remove(item);\nremoveStableID(item);\nnotifyDataSetChanged();\n}\npublic GridViewAdapter(List&lt;?&gt; elements) {\ninit(elements);\n}\n@Override\npublic int getCount() {\nreturn mItems.size();\n}\n@Override\npublic Object getItem(int position) {\nreturn mItems.get(position);\n}\n\/**\n* get id for position\n*\n* @param position\n* @return\n*\/\n@Override\npublic final long getItemId(int position) {\nif (position &lt; 0 || position &gt;= mIdMap.size()) {\nreturn -1;\n}\nObject item = getItem(position);\nreturn mIdMap.get(item);\n}\n@Override\npublic View getView(int position, View convertView, ViewGroup parent) {\nView view\u00a0=(View) getItem(position);\nreturn view;\n}\n}\n<\/pre>\n<p>\u8bf4\u5b9e\u8bdd\uff0c\u8fd9\u95ee\u9898\u5f88\u8be1\u5f02\uff0c\u548c\u540c\u4e8b\u4e00\u8d77\u627e\uff0c\u627e\u5230GitHub\u4e0a\u7684\u4e5d\u5bab\u683c\u4e0d\u540c\u5b9e\u73b0\uff0c\u770b\u4eba\u5bb6\u4ee3\u7801\u3001\u505a\u5c1d\u8bd5\u624d\u89e3\u51b3\u8fd9\u95ee\u9898\uff0cGridView\u8fd9\u63a7\u4ef6\u592a\u590d\u6742\uff0c\u4e4b\u524d\u8fd8\u9047\u5230\u8fc7GridView\u7b2c\u4e00\u4e2aitem\u4e0d\u54cd\u5e94\u7684\u95ee\u9898\uff08stackoverflow\u4e0a\u4e00\u5806\u76f8\u5173\u95ee\u9898\uff09\uff0c\u6709\u65f6\u95f4\u518d\u7ec6\u8bf4\u3002\u4e0a\u9762\u6709\u5173BaseAdapter\u7684\u5206\u6790\u4ec5\u4ec5\u662f\u6211\u53c2\u8003\u7f51\u4e0a\u5e16\u5b50\u505a\u7684\u4e00\u4e9b\u63a8\u65ad\uff0c\u5982\u6709\u9519\u8bef\u6216\u662f\u758f\u6f0f\u6b22\u8fce\u5927\u5bb6\u6307\u6b63\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8981\u5b9e\u73b0\u53ef\u62d6\u52a8\u7684\u4e5d\u5bab\u683c\uff0c\u7f51\u4e0a\u641c\u4e86\u4e0b\uff0c\u641c\u5230\u6bd4\u8f83\u9760\u8c31\u7684\u662f\u8fd9\u4e2a\u7248\u672c\uff0c\u539f\u7406\u3001\u5b9e\u73b0\u90fd\u5199\u7684\u5f88\u6e05\u695a\uff0c\u4f46\u6709\u4e2a\u95ee\u9898\uff0c\u7528\u5230GridV <a href='http:\/\/prayerlaputa.com\/?p=221' class='excerpt-more'>[&#8230;]<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0},"categories":[2,6,18],"tags":[26,33,50],"_links":{"self":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/221"}],"collection":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=221"}],"version-history":[{"count":0,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=\/wp\/v2\/posts\/221\/revisions"}],"wp:attachment":[{"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=221"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/prayerlaputa.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}