本文较为详细的总结分析了android编程下拉菜单spinner用法。分享给大家供大家参考，具体如下：
spinner控件也是一种列表类型的控件，它的继承关系如下：
java.lang.object
↳ android.view.view
↳ android.view.viewgroup
↳ android.widget.adapterview<textends android.widget.adapter>
↳ android.widget.absspinner
↳ android.widget.spinner
android.widget.spinner继承了android.view.viewgroup类。
在android的ui开发中，spinner(下拉列表)总是可以用到的，一个简单的自定义spinner制作我们只需要记住这重要的五步，一个spinner就可以应用而生了。
(1)新建一个android工程，名称为spinner。同时建一个activity，名称为spinneractivity。
(2)修改res/layout/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" > <textview android:id = "@+id/textview_city" android:layout_width = "wrap_content" android:layout_height = "wrap_content" android:text = "所在城市：" /> <!-- 定义一个城市信息下拉菜单--> <spinner android:id = "@+id/spinner_city" android:layout_width = "wrap_content" android:layout_height ="wrap_content" > </spinner > </linearlayout> |
(3)spinneractivity.java 代码
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package cn.com; import java.util.arraylist; import java.util.list; import android.app.activity; import android.os.bundle; import android.view.motionevent; import android.view.view; import android.widget.adapterview; import android.widget.arrayadapter; import android.widget.spinner; import android.widget.textview; public class spinneractivity extends activity { /** called when the activity is first created. */ private list<string> list = new arraylist<string>(); private textview mytextview; private spinner myspinner; private arrayadapter<string> adapter; @override public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.main); //第一步：添加一个下拉列表项的list，这里添加的项就是下拉列表的菜单项 list.add("北京"); list.add("上海"); list.add("深圳"); list.add("福州"); list.add("厦门"); mytextview = (textview)findviewbyid(r.id.textview_city); myspinner = (spinner)findviewbyid(r.id.spinner_city); //第二步：为下拉列表定义一个适配器，这里就用到里前面定义的list。 adapter = new arrayadapter<string>(this,android.r.layout.simple_spinner_item, list); //第三步：为适配器设置下拉列表下拉时的菜单样式。 adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); //第四步：将适配器添加到下拉列表上 myspinner.setadapter(adapter); //第五步：为下拉列表设置各种事件的响应，这个事响应菜单被选中 myspinner.setonitemselectedlistener(new spinner.onitemselectedlistener(){ public void onitemselected(adapterview<?> arg0, view arg1, int arg2, long arg3) { // todo auto-generated method stub /* 将所选myspinner 的值带入mytextview 中*/ mytextview.settext("您选择的是："+ adapter.getitem(arg2)); /* 将myspinner 显示*/ arg0.setvisibility(view.visible); } public void onnothingselected(adapterview<?> arg0) { // todo auto-generated method stub mytextview.settext("none"); arg0.setvisibility(view.visible); } }); /*下拉菜单弹出的内容选项触屏事件处理*/ myspinner.setontouchlistener(new spinner.ontouchlistener(){ public boolean ontouch(view v, motionevent event) { // todo auto-generated method stub /** * */ return false; } }); /*下拉菜单弹出的内容选项焦点改变事件处理*/ myspinner.setonfocuschangelistener(new spinner.onfocuschangelistener(){ public void onfocuschange(view v, boolean hasfocus) { // todo auto-generated method stub } }); } } |
运行结果如下图所示：
补充：spinner控件用法示例2则
用法1：
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<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.example.mars_2100_spinner.mainactivity" tools:ignore="mergerootframe" ><spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/spinnerid"/></linearlayout> |
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package com.example.mars_2100_spinner;import android.support.v7.app.actionbaractivity;import android.support.v7.app.actionbar;import android.support.v4.app.fragment;import android.os.bundle;import android.view.layoutinflater;import android.view.menu;import android.view.menuitem;import android.view.view;import android.view.viewgroup;import android.widget.adapterview;import android.widget.arrayadapter;import android.widget.spinner;import android.widget.toast;import android.os.build;public class mainactivity extends actionbaractivity { private static final string[] m_arr = {"第一组","第二组","第三组"}; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); spinner _spin = (spinner)findviewbyid(r.id.spinnerid); arrayadapter<string> ada = new arrayadapter<string>(this, android.r.layout.simple_spinner_item, m_arr); ada.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); _spin.setadapter(ada); _spin.setonitemselectedlistener(new spinner.onitemselectedlistener(){ public void onitemselected(adapterview<?> arg0, view arg1, int arg2, long arg3){ disptoast("选择的是"+m_arr[arg2]); arg0.setvisibility(view.visible); } public void onnothingselected(adapterview<?> arg0){ // } }); /*if (savedinstancestate == null) { getsupportfragmentmanager().begintransaction().add(r.id.container, new placeholderfragment()).commit(); }*/ } public void disptoast(string str){ toast.maketext(this, str, toast.length_short).show(); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate the menu; this adds items to the action bar if it is present. getmenuinflater().inflate(r.menu.main, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. the action bar will // automatically handle clicks on the home/up button, so long // as you specify a parent activity in androidmanifest.xml. int id = item.getitemid(); if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } /** * a placeholder fragment containing a simple view. */ public static class placeholderfragment extends fragment { public placeholderfragment() { } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view rootview = inflater.inflate(r.layout.fragment_main, container, false); return rootview; } }} |
用法2：
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<linearlayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" tools:context="com.example.mars_2100_spinner.mainactivity" tools:ignore="mergerootframe" ><spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/spinnerid2"/><textview android:id="@+id/textview1" android:layout_width="fill_parent" android:layout_height="wrap_content"/><spinner android:layout_width="fill_parent" android:layout_height="wrap_content" android:id="@+id/spinnerid3"/><textview android:id="@+id/textview2" android:layout_width="fill_parent" android:layout_height="wrap_content"/></linearlayout> |
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package com.example.mars_2100_spinner;import android.support.v7.app.actionbaractivity;import android.support.v7.app.actionbar;import android.support.v4.app.fragment;import android.app.activity;import android.os.bundle;import android.view.layoutinflater;import android.view.menu;import android.view.menuitem;import android.view.view;import android.view.viewgroup;import android.widget.adapterview;import android.widget.adapterview.onitemselectedlistener;import android.widget.arrayadapter;import android.widget.spinner;import android.widget.textview;import android.os.build;public class main02activity extends activity { static final string[] constellations = new string[] { "白羊座", "金牛座", "双子座", "巨蟹座", "狮子座", "处女座", "天枰座", "天蝎座", "射手座", "魔蝎座", "水瓶座", "双鱼座" }; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main02); final textview txt2 = (textview) findviewbyid(r.id.textview1); spinner s1 = (spinner) findviewbyid(r.id.spinnerid2); final arrayadapter<charsequence> adapter = arrayadapter.createfromresource(this, r.array.planets_array, android.r.layout.simple_spinner_item); adapter.setdropdownviewresource(android.r.layout.simple_spinner_dropdown_item); s1.setadapter(adapter); s1.setprompt("测试"); s1.setonitemselectedlistener(new onitemselectedlistener() { @override public void onitemselected(adapterview<?> parent, view view, int position, long id) { txt2.settext(adapter.getitem(position).tostring()); } @override public void onnothingselected(adapterview<?> parent) { txt2.settext("没选中的"); } }); final textview txt4 = (textview) findviewbyid(r.id.textview2); spinner s2 = (spinner) findviewbyid(r.id.spinnerid3); arrayadapter<charsequence> adapterc = new arrayadapter<charsequence>(this, android.r.layout.simple_spinner_item, constellations); adapterc.setdropdownviewresource(android.r.layout.simple_spinner_item); s2.setadapter(adapterc); s2.setonitemselectedlistener(new onitemselectedlistener() { public void onitemselected(adapterview<?> parent, view view, int position, long id) { txt4.settext(constellations[position]); } public void onnothingselected(adapterview<?> parent) { txt4.settext("没选中的"); } }); } @override public boolean oncreateoptionsmenu(menu menu) { // inflate the menu; this adds items to the action bar if it is present. getmenuinflater().inflate(r.menu.main02, menu); return true; } @override public boolean onoptionsitemselected(menuitem item) { // handle action bar item clicks here. the action bar will // automatically handle clicks on the home/up button, so long // as you specify a parent activity in androidmanifest.xml. int id = item.getitemid(); if (id == r.id.action_settings) { return true; } return super.onoptionsitemselected(item); } /** * a placeholder fragment containing a simple view. */ public static class placeholderfragment extends fragment { public placeholderfragment() { } @override public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) { view rootview = inflater.inflate(r.layout.fragment_main02, container, false); return rootview; } }} |
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<?xml version="1.0" encoding="utf-8"?><resources> <string name="app_name">mars_2100_spinner</string> <string name="hello_world">hello world!</string> <string name="action_settings">settings</string> <string-array name="planets_array"> <item>mercury</item> <item>venus</item> <item>earth</item> <item>mars</item> <item>jupiter</item> <item>saturn</item> <item>uranus</item> <item>neptune</item> </string-array> <string name="title_activity_main02">main02activity</string></resources> |
希望本文所述对大家android程序设计有所帮助。
