Android编程实现多列显示的下拉列表框Spinner功能示例
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2022-06-19 22:41:11
本文实例讲述了android编程实现多列显示的下拉列表框spinner功能。分享给大家供大家参考,具体如下:
先上张效果图:
严格来说,这并不是一个下拉列表,只不过...
本文实例讲述了android编程实现多列显示的下拉列表框spinner功能。分享给大家供大家参考,具体如下:
先上张效果图:
严格来说,这并不是一个下拉列表,只不过实现的效果很像是下拉列表
实现原理:
该下拉列表其实是一个alertdialog.builder,给它设置了一个以linearlayout布局的view。该view内使用了一个gridview组件,
代码:
package yyy.testandroid9; private intent intent; private int index = 0; private sharedpreferences preferences; private file file; private spinner spinner; private gridview gridview; private linearlayout layout; private builder builder; private alertdialog dialog; private myadapter adapter; /** called when the activity is first created. */ @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); layoutinflater inflater = layoutinflater.from(this); layout = (linearlayout) inflater.inflate(r.layout.bank_grid, null); gridview = (gridview) layout.findviewbyid(r.id.grid); adapter = new myadapter(this); gridview.setadapter(adapter); button1 = (button) findviewbyid(r.id.button1); button2 = (button) findviewbyid(r.id.button2); textview = (textview) findviewbyid(r.id.textview); builder = new builder(testandroid9activity.this); builder.setview(layout); button1.setonclicklistener(new onclicklistener() { public void onclick(view arg0) { // todo auto-generated method stub if(dialog == null){ dialog = builder.show(); } dialog.show(); } }); gridview.setonitemclicklistener(new onitemclicklistener() { public void onitemclick(adapterview<?> arg0, view arg1, int position, long arg3) { // todo auto-generated method stub button1.settext(getresources().getstringarray(r.array.city)[position]); dialog.dismiss(); adapter.map.put(index, false); adapter.map.put(position, true); index = position; adapter.notifydatasetchanged(); } }); } private class myadapter extends baseadapter{ private context context; private string[] citys; private layoutinflater inflater; public hashmap<integer, boolean> map; public myadapter(context context) { super(); this.context = context; citys = context.getresources().getstringarray(r.array.city); inflater = layoutinflater.from(context); map = new hashmap<integer, boolean>(); for(int i=0;i<citys.length;i++){ map.put(i, false); } } public int getcount() { // todo auto-generated method stub return citys.length; } public object getitem(int position) { // todo auto-generated method stub return null; } public long getitemid(int position) { // todo auto-generated method stub return position; } public view getview(int position, view view, viewgroup parent) { // todo auto-generated method stub if(view == null){ view = inflater.inflate(r.layout.bank_item, null); } textview textview = (textview) view.findviewbyid(r.id.list_text); radiobutton radiobutton = (radiobutton) view.findviewbyid(r.id.radiobutton); radiobutton.setchecked(map.get(position)); textview.settext(citys[position]); return view; } }
bank_grid.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" android:padding="20dp" android:background="#ffffff" android:id="@+id/grid_layout"> <gridview android:id="@+id/grid" android:layout_width="fill_parent" android:layout_height="fill_parent" android:verticalspacing="20px" android:horizontalspacing="10px" android:numcolumns="4" android:scrollbars="vertical" android:layout_margin="10dp"/> </linearlayout>
bank_item.xml
<?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="#ffffff" > <radiobutton android:id="@+id/radiobutton" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginright="15dp" android:focusable="false" android:clickable="false" android:focusableintouchmode="false" /> <textview android:id="@+id/list_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:textcolor="#000000" android:layout_gravity="center_vertical"/> </linearlayout>
更多关于android相关内容感兴趣的读者可查看本站专题:《android视图view技巧总结》、《android布局layout技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》及《android控件用法总结》
希望本文所述对大家android程序设计有所帮助。
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