Using java language, Android-based development code, the main function: There are two buttons on the phone displays the current date and time.

ch02_showdatetime
.................\.classpath
.................\.project
.................\.settings
.................\.........\org.eclipse.jdt.core.prefs
.................\AndroidManifest.xml
.................\assets
.................\bin
.................\...\AndroidManifest.xml
.................\...\ch02_showdatetime.apk
.................\...\classes
.................\...\.......\net
.................\...\.......\...\blogjava
.................\...\.......\...\........\mobile
.................\...\.......\...\........\......\BuildConfig.class
.................\...\.......\...\........\......\Main.class
.................\...\.......\...\........\......\R$attr.class
.................\...\.......\...\........\......\R$drawable.class
.................\...\.......\...\........\......\R$id.class
.................\...\.......\...\........\......\R$layout.class
.................\...\.......\...\........\......\R$string.class
.................\...\.......\...\........\......\R.class
.................\...\classes.dex
.................\...\dexedLibs
.................\...\.........\annotations-23306d58b89c9a8e6e1479880a70ed77.jar
.................\...\jarlist.cache
.................\...\res
.................\...\...\drawable
.................\...\...\........\icon.png
.................\...\resources.ap_
.................\gen
.................\...\net
.................\...\...\blogjava
.................\...\...\........\mobile
.................\...\...\........\......\BuildConfig.java
.................\...\...\........\......\R.java
.................\project.properties
.................\res
.................\...\drawable
.................\...\........\icon.png
.................\...\drawable-hdpi
.................\...\drawable-ldpi
.................\...\drawable-mdpi
.................\...\drawable-xhdpi
.................\...\layout
.................\...\......\main.xml
.................\...\values
.................\...\......\strings.xml
.................\src
.................\...\net
.................\...\...\blogjava
.................\...\...\........\mobile
.................\...\...\........\......\Main.java

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