how to implement basic UI function based on android platform.

Task2_UI\.classpath
........\.project
........\AndroidManifest.xml
........\default.properties
........\bin\classes.dex
........\...\resources.ap_
........\...\Task2_UI.apk
........\...\edu\lytu\Task2_UI\R$attr.class
........\...\...\....\........\R$drawable.class
........\...\...\....\........\R$id.class
........\...\...\....\........\R$layout.class
........\...\...\....\........\R$string.class
........\...\...\....\........\R.class
........\...\...\....\........\Task2_UI$1.class
........\...\...\....\........\Task2_UI$2.class
........\...\...\....\........\Task2_UI.class
........\gen\edu\lytu\Task2_UI\R.java
........\res\drawable\icon.png
........\...\layout\main.xml
........\...\values\strings.xml
........\src\edu\lytu\Task2_UI\Task2_UI.java
........\bin\edu\lytu\Task2_UI
........\gen\edu\lytu\Task2_UI
........\src\edu\lytu\Task2_UI
........\bin\edu\lytu
........\gen\edu\lytu
........\src\edu\lytu
........\bin\edu
........\gen\edu
........\res\drawable
........\...\layout
........\...\values
........\src\edu
........\assets
........\bin
........\gen
........\res
........\src
Task2_UI

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