Based on the android custom drop-down list, is an upgraded version of the spinner

DropView
........\.classpath
........\.project
........\AndroidManifest.xml
........\assets
........\bin
........\...\AndroidManifest.xml
........\...\classes
........\...\.......\com
........\...\.......\...\tvt
........\...\.......\...\...\test
........\...\.......\...\...\....\BaseSpinnerAdapter$1.class
........\...\.......\...\...\....\BaseSpinnerAdapter.class
........\...\.......\...\...\....\BaseSpinnerItem.class
........\...\.......\...\...\....\BuildConfig.class
........\...\.......\...\...\....\DropView$1.class
........\...\.......\...\...\....\DropView$2.class
........\...\.......\...\...\....\DropView$3.class
........\...\.......\...\...\....\DropView$CreateBack.class
........\...\.......\...\...\....\DropView$DropViewBack.class
........\...\.......\...\...\....\DropView$DropViewClick.class
........\...\.......\...\...\....\DropView$TriangleView.class
........\...\.......\...\...\....\DropView.class
........\...\.......\...\...\....\DropViewActivity$ChildTag.class
........\...\.......\...\...\....\DropViewActivity$MyAdapter.class
........\...\.......\...\...\....\DropViewActivity.class
........\...\.......\...\...\....\R$attr.class
........\...\.......\...\...\....\R$drawable.class
........\...\.......\...\...\....\R$id.class
........\...\.......\...\...\....\R$layout.class
........\...\.......\...\...\....\R$string.class
........\...\.......\...\...\....\R.class
........\...\.......\...\...\....\TestView.class
........\...\.......\...\...\....\UIComboBox$1.class
........\...\.......\...\...\....\UIComboBox$2.class
........\...\.......\...\...\....\UIComboBox.class
........\...\res
........\default.properties
........\gen
........\...\com
........\...\...\tvt
........\...\...\...\test
........\...\...\...\....\BuildConfig.java
........\...\...\...\....\R.java
........\proguard.cfg
........\project.properties
........\res
........\...\drawable-hdpi
........\...\.............\choose.png
........\...\.............\icon.png
........\...\.............\list_selector.9.png
........\...\.............\select_bg.png
........\...\.............\select_no_bg.png
........\...\drawable-ldpi
........\...\.............\icon.png
........\...\drawable-mdpi
........\...\.............\icon.png
........\...\layout
........\...\......\main.xml
........\...\values
........\...\......\strings.xml
........\src
........\...\com
........\...\...\tvt
........\...\...\...\test
........\...\...\...\....\BaseSpinnerAdapter.java
........\...\...\...\....\BaseSpinnerItem.java
........\...\...\...\....\DropView.java
........\...\...\...\....\DropViewActivity.java
........\...\...\...\....\TestView.java
........\...\...\...\....\UIComboBox.java

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