本文实例讲述了android编程使用listview实现数据列表显示的方法。分享给大家供大家参考,具体如下:
要将数据库中的数据列表显示在屏幕上,我们要使用listview这个控件,当用户从数据库中取出数据时,要将数据绑定到显示控件上,如何绑定呢,我们需要创建适配器进行绑定,创建适配器有两种方式:
第一种是用simpleadapter创建(要求绑定的数据是list<hashmap<string, object>>数据类型)
第二种是用simplecursoradapter创建(要求绑定的数据是cursor数据类型)
显示效果如图所示:
界面布局:
item.xml
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<?xml version= "1.0" encoding= "utf-8" ?> <!--item --> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation= "horizontal" android:layout_width= "fill_parent" android:layout_height= "fill_parent" > <!-- 名称 --> <textview android:layout_width= "130dp" android:layout_height= "wrap_content" android:id= "@+id/name" /> <!-- 电话 --> <textview android:layout_width= "150dp" android:layout_height= "wrap_content" android:id= "@+id/phone" /> <!-- 存款 --> <textview android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:id= "@+id/amount" /> </linearlayout> |
main.xml
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<?xml version= "1.0" encoding= "utf-8" ?> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/android" android:orientation= "vertical" android:layout_width= "fill_parent" android:layout_height= "fill_parent" > <!-- 标题 --> <linearlayout android:orientation= "horizontal" android:layout_width= "fill_parent" android:layout_height= "wrap_content" > <textview android:layout_width= "130dp" android:layout_height= "wrap_content" android:text= "姓名" /> <textview android:layout_width= "150dp" android:layout_height= "wrap_content" android:text= "电话" /> <textview android:layout_width= "fill_parent" android:layout_height= "wrap_content" android:text= "存款" /> </linearlayout> <!-- listview控件 --> <listview android:layout_width= "fill_parent" android:layout_height= "fill_parent" android:id= "@+id/listview" /> </linearlayout> |
使用simpleadapter进行数据绑定
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public class mainactivity extends activity { private personservice service; @override public void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); setcontentview(r.layout.main); service = new personservice( this ); listview listview = (listview) this .findviewbyid(r.id.listview); //获取到集合数据 list<person> persons = service.getscrolldata( 0 , 10 ); list<hashmap<string, object>> data = new arraylist<hashmap<string,object>>(); for (person person : persons){ hashmap<string, object> item = new hashmap<string, object>(); item.put( "id" , person.getid()); item.put( "name" , person.getname()); item.put( "phone" , person.getphone()); item.put( "amount" , person.getamount()); data.add(item); } //创建simpleadapter适配器将数据绑定到item显示控件上 simpleadapter adapter = new simpleadapter( this , data, r.layout.item, new string[]{ "name" , "phone" , "amount" }, new int []{r.id.name, r.id.phone, r.id.amount}); //实现列表的显示 listview.setadapter(adapter); //条目点击事件 listview.setonitemclicklistener( new itemclicklistener()); } //获取点击事件 private final class itemclicklistener implements onitemclicklistener{ public void onitemclick(adapterview<?> parent, view view, int position, long id) { listview listview = (listview) parent; hashmap<string, object> data = (hashmap<string, object>) listview.getitematposition(position); string personid = data.get( "id" ).tostring(); toast.maketext(getapplicationcontext(), personid, 1 ).show(); } } } |
使用simplecursoradapter进行数据绑定
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public class mainactivity extends activity { private personservice service; @override public void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); setcontentview(r.layout.main); service = new personservice( this ); listview listview = (listview) this .findviewbyid(r.id.listview); //获取游标 cursor cursor = service.getcursorscrolldata( 0 , 10 ); //创建simplecursoradapter适配器将数据绑定到item显示控件上 simplecursoradapter adapter = new simplecursoradapter( this , r.layout.item, cursor, new string[]{ "name" , "phone" , "amount" }, new int []{r.id.name, r.id.phone, r.id.amount}); listview.setadapter(adapter); //条目点击事件 listview.setonitemclicklistener( new itemclicklistener()); } private final class itemclicklistener implements onitemclicklistener{ public void onitemclick(adapterview<?> parent, view view, int position, long id) { listview listview = (listview) parent; cursor cursor = (cursor) listview.getitematposition(position); string personid = string.valueof(cursor.getint(cursor.getcolumnindex( "_id" ))); toast.maketext(getapplicationcontext(), personid, 1 ).show(); } } } |
注意:使用第二种方式在获取数据集合时必须指定主键"_id"
希望本文所述对大家android程序设计有所帮助。