android4.1 setting s code source, has complete structure. You can download studies.

Settings\.git\config
........\....\description
........\....\HEAD
........\....\hooks
........\....\index
........\....\info
........\....\logs
........\....\objects
........\....\packed-refs
........\....\refs
........\....\rr-cache
........\....\svn
........\Android.mk
........\AndroidManifest.xml
........\CleanSpec.mk
........\MODULE_LICENSE_APACHE2
........\NOTICE
........\proguard.flags
........\res\drawable\appwidget_button_center.xml
........\...\........\appwidget_button_left.xml
........\...\........\appwidget_button_right.xml
........\...\........\data_sweep_left.xml
........\...\........\data_sweep_limit.xml
........\...\........\data_sweep_right.xml
........\...\........\data_sweep_warning.xml
........\...\........\data_usage_bar.xml
........\...\........\data_usage_sweep_background.xml
........\...\........\empty_icon.xml
........\...\........\ic_list_sync_anim.xml
........\...\........\ic_tab_all.xml
........\...\........\ic_tab_download.xml
........\...\........\ic_tab_running.xml
........\...\........\ic_tab_sdcard.xml
........\...\........\lock_anim.xml
........\...\........\signal.xml
........\...\........\wifi_signal.xml
........\...\........\wifi_signal_lock.xml
........\...\........\wifi_signal_open.xml
........\...\........-hdpi\appwidget_bg_holo.9.png
........\...\.............\appwidget_inner_focused_c_holo.9.png
........\...\.............\appwidget_inner_focused_l_holo.9.png
........\...\.............\appwidget_inner_focused_r_holo.9.png
........\...\.............\appwidget_inner_pressed_c_holo.9.png
........\...\.............\appwidget_inner_pressed_l_holo.9.png
........\...\.............\appwidget_inner_pressed_r_holo.9.png
........\...\.............\appwidget_settings_divider_holo.9.png
........\...\.............\appwidget_settings_ind_mid_c_holo.9.png
........\...\.............\appwidget_settings_ind_mid_l_holo.9.png
........\...\.............\appwidget_settings_ind_mid_r_holo.9.png
........\...\.............\appwidget_settings_ind_off_c_holo.9.png
........\...\.............\appwidget_settings_ind_off_l_holo.9.png
........\...\.............\appwidget_settings_ind_off_r_holo.9.png
........\...\.............\appwidget_settings_ind_on_c_holo.9.png
........\...\.............\appwidget_settings_ind_on_l_holo.9.png
........\...\.............\appwidget_settings_ind_on_r_holo.9.png
........\...\.............\data_grid_border.9.png
........\...\.............\data_grid_primary.9.png
........\...\.............\data_grid_secondary.9.png
........\...\.............\data_sweep_left_activated.9.png
........\...\.............\data_sweep_left_default.9.png
........\...\.............\data_sweep_limit_activated.9.png
........\...\.............\data_sweep_limit_default.9.png
........\...\.............\data_sweep_right_activated.9.png
........\...\.............\data_sweep_right_default.9.png
........\...\.............\data_sweep_warning_activated.9.png
........\...\.............\data_sweep_warning_default.9.png
........\...\.............\dotted_line_480px.png
........\...\.............\encroid_progress.png
........\...\.............\encroid_resignin.png
........\...\.............\encroid_waiting.png
........\...\.............\ic_appwidget_settings_bluetooth_off_holo.png
........\...\.............\ic_appwidget_settings_bluetooth_on_holo.png
........\...\.............\ic_appwidget_settings_brightness_auto_holo.png
........\...\.............\ic_appwidget_settings_brightness_full_holo.png
........\...\.............\ic_appwidget_settings_brightness_half_holo.png
........\...\.............\ic_appwidget_settings_brightness_off_holo.png
........\...\.............\ic_appwidget_settings_gps_off_holo.png
........\...\.............\ic_appwidget_settings_gps_on_holo.png
........\...\.............\ic_appwidget_settings_sync_off_holo.png
........\...\.............\ic_appwidget_settings_sync_on_holo.png
........\...\.............\ic_appwidget_settings_wifi_off_holo.png
........\...\.............\ic_appwidget_settings_wifi_on_holo.png
........\...\.............\ic_btn_next.png
........\...\.............\ic_bt_cellphone.png
...

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