android application, how to quit all acitivity

androidlee\.classpath
..........\.project
..........\AndroidManifest.xml
..........\bin\androidlee.apk
..........\...\classes.dex
..........\...\org\lee\android\Main$1.class
..........\...\...\...\.......\Main$2.class
..........\...\...\...\.......\Main$3.class
..........\...\...\...\.......\Main$4.class
..........\...\...\...\.......\Main.class
..........\...\...\...\.......\MyListView.class
..........\...\...\...\.......\MyListView2.class
..........\...\...\...\.......\MyListView3.class
..........\...\...\...\.......\MyListView4$1.class
..........\...\...\...\.......\MyListView4$MyAdapter$1.class
..........\...\...\...\.......\MyListView4$MyAdapter.class
..........\...\...\...\.......\MyListView4$ViewHolder.class
..........\...\...\...\.......\MyListView4.class
..........\...\...\...\.......\R$attr.class
..........\...\...\...\.......\R$drawable.class
..........\...\...\...\.......\R$id.class
..........\...\...\...\.......\R$layout.class
..........\...\...\...\.......\R$string.class
..........\...\...\...\.......\R.class
..........\...\resources.ap_
..........\default.properties
..........\gen\org\lee\android\R.java
..........\res\drawable-hdpi\icon.png
..........\...\.........ldpi\icon.png
..........\...\.........mdpi\i1.jpg
..........\...\.............\i2.jpg
..........\...\.............\i3.jpg
..........\...\.............\icon.png
..........\...\layout\main.xml
..........\...\......\vlist.xml
..........\...\......\vlist2.xml
..........\...\values\strings.xml
..........\src\org\lee\android\Main.java
..........\...\...\...\.......\MyListView.java
..........\...\...\...\.......\MyListView2.java
..........\...\...\...\.......\MyListView3.java
..........\...\...\...\.......\MyListView4.java

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