Two linkage menu drop-down menu of the source code to achieve the two menu choices

AndroidDay05_LinkedSpinner
..........................\.classpath
..........................\.project
..........................\AndroidManifest.xml
..........................\assets
..........................\bin
..........................\...\AndroidDay05_LinkedSpinner.apk
..........................\...\AndroidManifest.xml
..........................\...\classes
..........................\...\.......\com
..........................\...\.......\...\example
..........................\...\.......\...\.......\androidday05_linkedspinner
..........................\...\.......\...\.......\..........................\BuildConfig.class
..........................\...\.......\...\.......\..........................\MainActivity$1.class
..........................\...\.......\...\.......\..........................\MainActivity.class
..........................\...\.......\...\.......\..........................\R$attr.class
..........................\...\.......\...\.......\..........................\R$dimen.class
..........................\...\.......\...\.......\..........................\R$drawable.class
..........................\...\.......\...\.......\..........................\R$id.class
..........................\...\.......\...\.......\..........................\R$layout.class
..........................\...\.......\...\.......\..........................\R$menu.class
..........................\...\.......\...\.......\..........................\R$string.class
..........................\...\.......\...\.......\..........................\R$style.class
..........................\...\.......\...\.......\..........................\R.class
..........................\...\classes.dex
..........................\...\dexedLibs
..........................\...\.........\android-support-v4-55cd9d586b4a939a40e331326730b1ac.jar
..........................\...\jarlist.cache
..........................\...\res
..........................\...\...\drawable-hdpi
..........................\...\...\.............\ic_launcher.png
..........................\...\...\drawable-mdpi
..........................\...\...\.............\ic_launcher.png
..........................\...\...\drawable-xhdpi
..........................\...\...\..............\ic_launcher.png
..........................\...\...\drawable-xxhdpi
..........................\...\...\...............\ic_launcher.png
..........................\...\resources.ap_
..........................\gen
..........................\...\com
..........................\...\...\example
..........................\...\...\.......\androidday05_linkedspinner
..........................\...\...\.......\..........................\BuildConfig.java
..........................\...\...\.......\..........................\R.java
..........................\ic_launcher-web.png
..........................\libs
..........................\....\android-support-v4.jar
..........................\proguard-project.txt
..........................\project.properties
..........................\res
..........................\...\drawable-hdpi
..........................\...\.............\ic_launcher.png
..........................\...\drawable-ldpi
..........................\...\drawable-mdpi
..........................\...\.............\ic_launcher.png
..........................\...\drawable-xhdpi
..........................\...\..............\ic_launcher.png
..........................\...\drawable-xxhdpi
..........................\...\...............\ic_launcher.png
..........................\...\layout
..........................\...\......\activity_main.xml
..........................\...\menu
..........................\...\....\main.xml
..........................\...\values
..........................\...\......\dimens.xml
..........................\...\......\strings.xml
..........................\...\......\styles.xml
..........................\...\values-sw600dp
..........................\...\..............\dimens.xml
..........................\...\values-sw720dp-land
..........................\...\...................\dimens.xml
...................

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