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*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 );
}
}
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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>
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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>
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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>
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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>
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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>
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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。