实现此功能没有太多的技术难点,主要通过popupwindow方法,同时更进一步加深了popupwindow的使用,实现点击弹出一个自定义的view,view里面可以自由设计,比较常用的可以放一个listview。
demo中我只是一个点击展示,简单的使用了fade in out的动画效果,也没有精美的图片资源,看着也丑,不过这么短的时间,让你掌握一个很好用的技术,可以自己扩展,不很好么?
废话不说了,直接上代码:
mainactivity.java
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public class mainactivity extends activity implements onclicklistener { private popupwindow popupwindow; private button button; @override protected void oncreate(bundle savedinstancestate) { super .oncreate(savedinstancestate); setcontentview(r.layout.activity_main); button = (button) findviewbyid(r.id.button1); button.setonclicklistener( this ); } @override public void onclick(view v) { switch (v.getid()) { case r.id.button1: if (popupwindow != null &&popupwindow.isshowing()) { popupwindow.dismiss(); return ; } else { initmpopupwindowview(); popupwindow.showasdropdown(v, 0 , 5 ); } break ; default : break ; } } public void initmpopupwindowview() { // // 获取自定义布局文件pop.xml的视图 view customview = getlayoutinflater().inflate(r.layout.popview_item, null , false ); // 创建popupwindow实例,200,150分别是宽度和高度 popupwindow = new popupwindow(customview, 250 , 280 ); // 设置动画效果 [r.style.animationfade 是自己事先定义好的] popupwindow.setanimationstyle(r.style.animationfade); // 自定义view添加触摸事件 customview.setontouchlistener( new ontouchlistener() { @override public boolean ontouch(view v, motionevent event) { if (popupwindow != null && popupwindow.isshowing()) { popupwindow.dismiss(); popupwindow = null ; } return false ; } }); /** 在这里可以实现自定义视图的功能 */ button btton2 = (button) customview.findviewbyid(r.id.button2); button btton3 = (button) customview.findviewbyid(r.id.button3); button btton4 = (button) customview.findviewbyid(r.id.button4); btton2.setonclicklistener( this ); btton3.setonclicklistener( this ); btton4.setonclicklistener( this ); } } |
activity_main.xml
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<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http://schemas.android.com/tools" android:layout_width= "match_parent" android:layout_height= "match_parent" android:background= "#000000" tools:context= ".mainactivity" > <button android:id= "@+id/button1" android:layout_width= "match_parent" android:layout_height= "wrap_content" android:layout_alignparentleft= "true" android:layout_alignparenttop= "true" android:gravity= "center" android:background= "#c0c0c0" android:text= "点击下拉列表" /> </relativelayout> |
自定义view的xml
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<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http://schemas.android.com/tools" android:layout_width= "match_parent" android:layout_height= "match_parent" android:background= "#c0c0c0" > <button android:id= "@+id/button2" android:layout_width= "200dp" android:layout_height= "wrap_content" android:layout_alignparentleft= "true" android:layout_alignparenttop= "true" android:paddingright= "70dp" android:text= "viviens" /> <button android:id= "@+id/button3" android:layout_width= "200dp" android:layout_height= "wrap_content" android:layout_alignparentleft= "true" android:layout_below= "@+id/button2" android:paddingright= "70dp" android:text= "mryang" /> <button android:id= "@+id/button4" android:layout_width= "200dp" android:layout_height= "wrap_content" android:layout_alignparentleft= "true" android:layout_below= "@+id/button3" android:paddingright= "70dp" android:text= "张晓达" /> </relativelayout> |
动画效果:
inputodown.xml 进入屏幕
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<?xml version= "1.0" encoding= "utf-8" ?> <set xmlns:android= "http://schemas.android.com/apk/res/android" > <translate android:duration= "500" android:fromydelta= "-100%" android:toydelta= "0" /> </set> |
outdowntoup.xml
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<?xml version= "1.0" encoding= "utf-8" ?> <set xmlns:android= "http://schemas.android.com/apk/res/android" > <translate android:duration= "500" android:fromydelta= "0" android:toydelta= "-100%" /> </set> |
styles.xml
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<style name= "animationfade" > <!-- popupwindow左右弹出的效果 --> <item name= "android:windowenteranimation" > @anim /inuptodown</item> <item name= "android:windowexitanimation" > @anim /outdowntoup</item> </style> |
实现效果:
以上所述就是本文对android使用popupwindow实现页面点击顶部弹出下拉菜单的全部内容,希望大家喜欢。