Open an pop-up window with animation.

1)First you have to create a method that display an pop-up.

         public void display_popup() {
                LayoutInflater layoutInflater = (LayoutInflater) getBaseContext()
.getSystemService(LAYOUT_INFLATER_SERVICE);
View popupView= layoutInflater.inflate(R.layout.follow_leader, null);

PopupWindow popupWindow = new PopupWindow(popupView,                                                                                     LayoutParams.FILL_PARENT,
            LayoutParams.FILL_PARENT);
popupWindow.showAtLocation(popupView, Gravity.CENTER, 0, 0);
         }

2)Next you have to write an animation XML for your pop-up inside res/anim folder.

fade_in.xml
                <set xmlns:android="http://schemas.android.com/apk/res/android"
                                android:fillAfter="true">
                   <alpha android:fromAlpha="0.0"
                               android:toAlpha="1.0"
                              android:duration="3000"/> //Time in milliseconds
                </set>
fade_out.xml
              <set xmlns:android="http://schemas.android.com/apk/res/android"
                    android:fillAfter="true" >
                   <alpha  android:duration="3000"
                               android:fromAlpha="1.0"
                              android:toAlpha="0.0" />
                </set>

3)After that you have to write an style for your pop-up inside values/style.xml file.

          <style name="PopupWindowAnimation">
                 <item name="android:windowEnterAnimation">@anim/fade_in</item>
                  <item name="android:windowExitAnimation">@anim/fade_out</item>
          </style>

4)Finally you set this style to pop-up by writing the below in your display_popup() method.

          popupWindow.setAnimationStyle(R.style.PopupWindowAnimation);

Done..android rocks..

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