Android uses the Popupwindow implementation page to click on the top pop-up pull-down menu _android

Implementation of this feature does not have too many technical difficulties, mainly through the Popupwindow method, at the same time further deepen the use of Popupwindow, realize click Pop-up a custom View,view inside can be free to design, more commonly used to put a ListView.

Demo I just a click Show, the simple use of the animation effect of fade in out, there is no exquisite picture resources, look also ugly, but so short time, let you master a very good technology, you can expand, not very well?

Nonsense not to say, directly on the code:

Mainactivity.java

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 () {////Get pop.xml View CustomView = Getlayoutinflater () for custom layout files. I 
    Nflate (R.layout.popview_item, NULL, FALSE); Create Popupwindow instance, 200,150 is width and height Popupwindow = new Popupwindow (cusTomview, 250, 280); 
    Set the animation effect [R.style.animationfade is its own predefined] Popupwindow.setanimationstyle (R.style.animationfade); Custom View Add Touch event Customview.setontouchlistener (new Ontouchlistener () {@Override public boolean Ontouch (View V, motionevent event) 
          {if (Popupwindow!= null && popupwindow.isshowing ()) {Popupwindow.dismiss (); 
        Popupwindow = null; 
      return false; 
    } 
    }); 
    /** Here you can implement a custom view function/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

<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= " Click on the dropdown list "/> 

Customizing view's XML

<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:backg" round= "#C0C0C0" > <button android:id= "@+id/button2" android:layout_width= "200DP" android:layout_he ight= "Wrap_content" android:layout_alignparentleft= "true" android:layout_alignparenttop= "true" Android:padd ingright= "70DP" android:text= "Viviens"/> <button android:id= "@+id/button3" 200DP "android:layout_height=" Wrap_content "android:layout_alignparentleft=" true "android:layout_below=" @+i 
    D/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= "Zhang Xiaoda"/> </RelativeLayout>  

Animation effect:

Inputodown.xml into the screen

<?xml version= "1.0" encoding= "UTF-8"?> <set xmlns:android= 
"http://schemas.android.com/apk/res/" Android "> 
  <translate 
    android:duration=" 
    android:fromydelta= " -100%" 
    android:toydelta= "0"/> 
</set>

Outdowntoup.xml

<?xml version= "1.0" encoding= "UTF-8"?> <set xmlns:android= 
"http://schemas.android.com/apk/res/" Android "> 
  <translate 
    android:duration=" 
    android:fromydelta= "0" 
    android:toydelta= " -100%"/> 
</set>

Styles.xml

<style name= "Animationfade" > 
  <!--popupwindow pop-up effect--> <item 
  "Android: Windowenteranimation "> @anim/inuptodown</item> 
  <item name=" Android:windowexitanimation "> @anim /outdowntoup</item> 

Implementation effect:

The above is the article on Android using the Popupwindow implementation page to click on the top pop-up drop-down menu of all the content, I hope you like.