Anroid mail source code, it is worth study and research, Google open source

Email_4.13
..........\Email_1.5
..........\.........\.classpath
..........\.........\.project
..........\.........\.settings
..........\.........\.........\org.eclipse.ltk.core.refactoring.prefs
..........\.........\Android.mk
..........\.........\AndroidManifest.xml
..........\.........\assets
..........\.........\......\empty.html
..........\.........\......\loading.gif
..........\.........\......\loading.html
..........\.........\......\test.html
..........\.........\bin
..........\.........\...\classes.dex
..........\.........\...\com
..........\.........\...\...\android
..........\.........\...\...\.......\email
..........\.........\...\...\.......\.....\activity
..........\.........\...\...\.......\.....\........\setup
..........\.........\...\...\.......\.....\........\.....\zx
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$2.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$3.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$4.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$5.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings$6.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSettings.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupAccountType.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupBasics$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupBasics$Provider.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupBasics.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupCheckSettings$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupCheckSettings$2.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupCheckSettings$3$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupCheckSettings$3.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupCheckSettings.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupIncoming$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupIncoming$2.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupIncoming.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupNames$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupNames.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupOptions.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupOutgoing$1.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupOutgoing$2.class
..........\.........\...\...\.......\.....\........\.....\..\AccountSetupOutgoing.class
..........\.........\...\...\.......\.....\........\.....\..\SpinnerOption.class
..........\.........\...\...\.......\.....\........\zx
..........\.........\...\...\.......\.....\........\..\Accounts$1.class
..........\.........\...\...\.......\.....\........\..\Accounts$2.class
..........\.........\...\...\.......\.....\........\..\Accounts$AccountsAdapter$AccountViewHolder.class
..........\.........\...\...\.......\.....\........\..\Accounts$AccountsAdapter.class
..........\.........\...\...\.......\.....\........\..\Accounts.class
..........\.........\...\...\.......\.....\........\..\AccountShortcutPicker$AccountsAdapter$AccountViewHolder.class
..........\.........\...\...\.......\.....\........\..\AccountShortcutPicker$AccountsAdapter.class
..........\.........\...\...\.......\.....\........\..\AccountShortcutPicker.class
..........\.........\...\...\.......\.....\........\..\Debug.class
..........\.........\...\...\.......\.....\........\..\FolderMessageList$1.class
..........\.........\...\...\.......\.....\........\..\FolderMessageList$FolderInfoHolder.

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