systemapp
这个里面主要存放的是常规下载的应用程序，可以看到都是以APK格式结尾的文件， 在这个文件夹下的程序为系统默认的组件，自己安装的软件将不会出现在这里，而是data文件夹中。
systemappAlarmClock.apk 闹钟
systemappAlarmClock.odex
systemappBrowser.apk 浏览器
systemappBrowser.odex
systemappBugreport.apk Bug报告
systemappBugreport.odex
systemappCalculator.apk 计算器
systemappCalculator.odex
systemappCalendar.apk 日历
systemappCalendar.odex
systemappCalendarProvider.apk 日历提供
systemappCalendarProvider.odex
systemappCamera.apk 照相机
systemappCamera.odex
systemappcom.amazon.mp3.apk 亚马逊音乐
systemappContacts.apk 联系人
systemappContacts.odex
systemappDownloadProvider.apk 下载提供
systemappDownloadProvider.odex
systemappDrmProvider.apk DRM数字版权提供
systemappDrmProvider.odex
systemappEmail.apk 电子邮件客户端
systemappEmail.odex
systemappFieldTest.apk 测试程序
systemappFieldTest.odex
systemappGDataFeedsProvider.apk GoogleData提供
systemappGDataFeedsProvider.odex
systemappGmail.apk Gmail电子邮件
systemappGmail.odex
systemappGmailProvider.apk Gmail提供
systemappGmailProvider.odex
systemappGoogleApps.apk 谷歌程序包
systemappGoogleApps.odex
systemappGoogleSearch.apk 搜索工具
systemappGoogleSearch.odex
systemappgtalkservice.apk GTalk服务
systemappgtalkservice.odex
systemappHTMLViewer.apk HTML查看器
systemappHTMLViewer.odex
systemappIM.apk 即使通讯组件包含MSN、yahoo通
systemappImCredentialProvider.apk
systemappImProvider.apk
systemappImProvider.odex
systemappLauncher.apk 启动加载器
systemappLauncher.odex
systemappMaps.apk 电子地图
systemappMaps.odex
systemappMediaProvider.apk 多媒体播放提供
systemappMediaProvider.odex
systemappMms.apk 短信、彩信
systemappMms.odex
systemappMusic.apk 音乐播放器
systemappMusic.odex
systemappMyFaves.apk T-Mobile MyFaves程序
systemappMyFaves.odex
systemappPackageInstaller.apk apk安装程序
systemappPackageInstaller.odex
systemappPhone.apk 电话拨号器
systemappPhone.odex
systemappSettings.apk 系统设置
systemappSettings.odex
systemappSettingsProvider.apk 设置提供
systemappSettingsProvider.odex
systemappSetupWizard.apk 设置向导
systemappSetupWizard.odex
systemappSoundRecorder.apk 录音工具
systemappSoundRecorder.odex
systemappStreet.apk 街景地图
systemappStreet.odex
systemappSync.apk 同步程序
systemappSync.odex
systemappTalk.apk 语音程序
systemappTalk.odex
systemappTelephonyProvider.apk 电话提供
systemappTelephonyProvider.odex
systemappUpdater.apk 更新程序
systemappUpdater.odex
systemappVending.apk 制造商信息
systemappVending.odex
systemappVoiceDialer.apk 语音拨号器
systemappVoiceDialer.odex
systemappYouTube.apk Youtube视频
systemappYouTube.odex
systemin
这个目录下的文件都是系统的本地程序，从bin文件夹名称可以看出是binary二进制的程序，里面主要是Linux系统自带的组件：
systeminakmd
systeminam
systeminapp_process 系统进程
systemindalvikvm Dalvik虚拟机宿主
systemindbus-daemon 系统BUS总线监控
systemindebuggerd 调试器
systemindebug_tool 调试工具
systemindexopt DEX选项
systemindhcpcd DHCP服务器
systemindumpstate 状态抓取器
systemindumpsys 系统抓取器
systemindvz
systeminfillup
systeminflash_image 闪存映像
systeminhciattach
systeminhcid HCID内核
systeminhostapd
systeminhostapd_cli
systeminhtclogkernel
systemininput
systemininstalld
systeminitr
systeminlinker
systeminlogcat Logcat日志打印
systeminlogwrapper
systeminmediaserver
systeminmonkey
systeminmountd 存储挂载器
systemin
etcfg 网络设置
systeminping Ping程序
systeminplaymp3 MP3播放器
systeminpm 包管理器
systeminqemud QEMU虚拟机
systemin
adiooptions 无线选项
systemin
ild RIL组件
systeminsdptool
systeminsdutil
systeminservice
systeminservicemanager 服务管理器
systeminsh
systeminssltest SSL测试
systeminsurfaceflinger 触摸感应驱动
systeminsvc 服务
systeminsystem_server
systemin elnetd Telnet组件
systemin oolbox
systeminwlan_loader
systeminwpa_cli
systeminwpa_supplicant
systemetc
从文件夹名称来看保存的都是系统的配置文件，比如APN接入点设置等核心配置。
systemetcapns-conf.xml APN接入点配置文件
systemetcAudioFilter.csv 音频过滤器配置文件
systemetcAudioPara4.csv
systemetcookmarks.xml 书签数据库
systemetcdbus.conf 总线监视配置文件
systemetcdhcpcd
systemetcevent-log-tags
systemetcfavorites.xml 收藏夹
systemetcfirmware 固件信息
systemetcgps.conf GPS设置文件
systemetchcid.conf 内核HCID配置文件
systemetchosts 网络DNS缓存
systemetcinit.goldfish.sh
systemetclocation 定位相关
systemetcmountd.conf 存储挂载配置文件
systemetcNOTICE.html 提示网页
systemetcpermissions.xml 权限许可
systemetcpvplayer.conf
systemetcsecurity
systemetcwifi WLAN相关组件
systemetcdhcpcddhcpcd-hooks
systemetcdhcpcddhcpcd-run-hooks
systemetcdhcpcddhcpcd.conf
systemetcdhcpcddhcpcd-hooks 1-test
systemetcdhcpcddhcpcd-hooks20-dns.conf
systemetcdhcpcddhcpcd-hooks95-configured
systemetcfirmwarerf6300.bin
systemetclocationgps
systemetclocationgpslocation 定位相关
systemetclocationgps
mea GPS数据解析
systemetclocationgpsproperties
systemetcsecuritycacerts.bks
systemetcsecurityotacerts.zip OTA下载验证
systemetcwifiFw1251r1c.bin
systemetcwifi iwlan.ini
systemetcwifiwpa_supplicant.conf WPA验证组件
systemfonts
字体文件夹，除了标准字体和粗体、斜体外可以看到文件体积最大的可能是中文字库，或一些unicode字库，从T-Mobile G1上可以清楚的看到显示简体中文正常，
systemfontsDroidSans-Bold.ttf
systemfontsDroidSans.ttf
systemfontsDroidSansFallback.ttf
systemfontsDroidSansMono.ttf
systemfontsDroidSerif-Bold.ttf
systemfontsDroidSerif-BoldItalic.ttf
systemfontsDroidSerif-Italic.ttf
systemfontsDroidSerif-Regular.ttf
systemframework
framework主要是一些核心的文件，从后缀名为jar可以看出是是系统平台框架,
systemframeworkam.jar
systemframeworkam.odex
systemframeworkAndroid.awt.jar AWT库
systemframeworkandroid.awt.odex
systemframeworkandroid.policy.jar
systemframeworkandroid.policy.odex
systemframeworkandroid.test.runner.jar
systemframeworkandroid.test.runner.odex
systemframeworkcom.google.android.gtalkservice.jar GTalk服务
systemframeworkcom.google.android.gtalkservice.odex
systemframeworkcom.google.android.maps.jar 电子地图库
systemframeworkcom.google.android.maps.odex
systemframeworkcore.jar 核心库，启动桌面时首先加载这个
systemframeworkcore.odex
systemframeworkext.jar
systemframeworkext.odex
systemframeworkframework-res.apk
systemframeworkframework-tests.jar
systemframeworkframework-tests.odex
systemframeworkframework.jar
systemframeworkframework.odex
systemframeworkinput.jar 输入库
systemframeworkinput.odex
systemframeworkitr.jar
systemframeworkitr.odex
systemframeworkmonkey.jar
systemframeworkmonkey.odex
systemframeworkpm.jar 包管理库
systemframeworkpm.odex
systemframeworkservices.jar
systemframeworkservices.odex
systemframeworkssltest.jar
systemframeworkssltest.odex
systemframeworksvc.jar 系统服务
systemframeworksvc.odex
systemlib
lib目录中存放的主要是系统底层库，如平台运行时库。
systemliblibaes.so
systemliblibagl.so
systemliblibandroid_runtime.so Android运行时库
systemliblibandroid_servers.so 系统服务组件
systemliblibaudio.so 音频处理
systemliblibaudioeq.so EQ均衡器
systemliblibaudioflinger.so 音频过滤器
systemliblibbluetooth.so 蓝牙组件
systemliblibc.so
systemliblibcamera.so 超相机组件
systemliblibcameraservice.so
systemliblibcorecg.so
systemliblibcrypto.so 加密组件
systemliblibctest.so
systemliblibcutils.so
systemliblibdbus.so
systemliblibdl.so
systemliblibdrm1.so DRM解析库
systemliblibdrm1_jni.so
systemliblibdvm.so
systemliblibexif.so
systemliblibexpat.so
systemliblibFFTEm.so
systemliblibGLES_CM.so
systemliblibgps.so
systemliblibhardware.so
systemliblibhgl.so
systemliblibhtc_ril.so
systemliblibicudata.so
systemliblibicui18n.so
systemliblibicuuc.so
systemlibliblog.so
systemliblibm.so
systemliblibmedia.so
systemliblibmediaplayerservice.so
systemliblibmedia_jni.so
systemliblibnativehelper.so
systemliblibnetutils.so
systemliblibOmxCore.so
systemliblibOmxH264Dec.so
systemliblibpixelflinger.so
systemliblibpvasf.so
systemliblibpvasfreg.so
systemliblibpvauthor.so
systemliblibpvcommon.so
systemliblibpvdownload.so
systemliblibpvdownloadreg.so
systemliblibpvmp4.so
systemliblibpvmp4reg.so
systemliblibpvnet_support.so
systemliblibpvplayer.so
systemliblibpvrtsp.so
systemliblibpvrtspreg.so
systemliblibqcamera.so
systemliblibreference-ril.so
systemliblibril.so
systemliblibrpc.so
systemliblibsgl.so
systemliblibsonivox.so
systemliblibsoundpool.so
systemliblibsqlite.so
systemliblibssl.so
systemliblibstdc++.so
systemliblibsurfaceflinger.so
systemliblibsystem_server.so
systemliblibthread_db.so
systemliblibUAPI_jni.so
systemliblibui.so
systemliblibutils.so
systemliblibvorbisidec.so
systemliblibwbxml.so
systemliblibwbxml_jni.so
systemliblibwebcore.so
systemliblibwpa_client.so
systemliblibxml2wbxml.so
systemliblibz.so
systemlibmodules
systemlibmoduleswlan.ko
systemmedia
铃声音乐文件夹，除了常规的铃声外还有一些系统提示事件音
systemmediaaudio
systemmediaaudioalarms 闹铃音
systemmediaaudio
otifications 提示音
systemmediaaudio
ingtones 铃声
systemmediaaudioui 界面操作事件音
systemmediaaudioalarmsAlarm_Beep_01.ogg
systemmediaaudioalarmsAlarm_Beep_02.ogg
systemmediaaudioalarmsAlarm_Beep_03.ogg
systemmediaaudioalarmsAlarm_Buzzer.ogg
systemmediaaudioalarmsAlarm_Classic.ogg
systemmediaaudioalarmsAlarm_Rooster_02.ogg
systemmediaaudio
otificationsBeat_Box_Android.ogg
systemmediaaudio
otificationsCaffeineSnake.ogg
systemmediaaudio
otificationsDearDeer.ogg
systemmediaaudio
otificationsDontPanic.ogg
systemmediaaudio
otificationsF1_MissedCall.ogg
systemmediaaudio
otificationsF1_New_MMS.ogg
systemmediaaudio
otificationsF1_New_SMS.ogg
systemmediaaudio
otificationsHeaven.ogg
systemmediaaudio
otificationsHighwire.ogg
systemmediaaudio
otificationsKzurbSonar.ogg
systemmediaaudio
otificationsOnTheHunt.ogg
systemmediaaudio
otificationsTaDa.ogg
systemmediaaudio
otificationsTinkerbell.ogg
systemmediaaudio
otificationsVoila.ogg
systemmediaaudio
ingtonesBeatPlucker.ogg
systemmediaaudio
ingtonesBentleyDubs.ogg
systemmediaaudio
ingtonesBirdLoop.ogg
systemmediaaudio
ingtonesCaribbeanIce.ogg
systemmediaaudio
ingtonesCrazyDream.ogg
systemmediaaudio
ingtonesCurveBall.ogg
systemmediaaudio
ingtonesDreamTheme.ogg
systemmediaaudio
ingtonesEtherShake.ogg
systemmediaaudio
ingtonesFriendlyGhost.ogg
systemmediaaudio
ingtonesGameOverGuitar.ogg
systemmediaaudio
ingtonesGrowl.ogg
systemmediaaudio
ingtonesInsertCoin.ogg
systemmediaaudio
ingtonesLoopyLounge.ogg
systemmediaaudio
ingtonesLoveFlute.ogg
systemmediaaudio
ingtonesMidEvilJaunt.ogg
systemmediaaudio
ingtonesMildlyAlarming.ogg
systemmediaaudio
ingtonesNewPlayer.ogg
systemmediaaudio
ingtonesNoises1.ogg
systemmediaaudio
ingtonesNoises2.ogg
systemmediaaudio
ingtonesNoises3.ogg
systemmediaaudio
ingtonesOrganDub.ogg
systemmediaaudio
ingtonesRing_Classic_02.ogg
systemmediaaudio
ingtonesRing_Digital_02.ogg
systemmediaaudio
ingtonesRing_Synth_02.ogg
systemmediaaudio
ingtonesRing_Synth_04.ogg
systemmediaaudio
ingtonesRomancingTheTone.ogg
systemmediaaudio
ingtonesSitarVsSitar.ogg
systemmediaaudio
ingtonesSpringyJalopy.ogg
systemmediaaudio
ingtonesT-Jingle.ogg
systemmediaaudio
ingtonesTerminated.ogg
systemmediaaudio
ingtonesTwirlAway.ogg
systemmediaaudio
ingtonesVeryAlarmed.ogg
systemmediaaudio
ingtonesWorld.ogg
systemmediaaudiouiEffect_Tick.ogg
systemsounds
默认的音乐测试文件，仅有一个test.mid文件，用于播放测试的文件。
systemsounds est.mid
systemusr
用户文件夹，包含共享、键盘布局、时间区域文件等。
systemusrkeychars
systemusrkeylayout
systemusrshare
systemusrsrec
systemusrkeycharsqwerty.kcm.bin
systemusrkeycharsqwerty2.kcm.bin
systemusrkeychars rout-keypad-qwertz.kcm.bin
systemusrkeychars rout-keypad-v2.kcm.bin
systemusrkeychars rout-keypad-v3.kcm.bin
systemusrkeychars rout-keypad.kcm.bin
systemusrkeylayouth2w_headset.kl
systemusrkeylayoutqwerty.kl
systemusrkeylayout rout-keypad-qwertz.kl
systemusrkeylayout rout-keypad-v2.kl
systemusrkeylayout rout-keypad-v3.kl
systemusrkeylayout rout-keypad.kl
systemusrsharesk
systemusrsharezoneinfo
systemusrshareskV_FD_speed_101.bsk
systemusrshareskV_FD_std_101.bsk
systemusrsharezoneinfozoneinfo.dat
systemusrsharezoneinfozoneinfo.idx
systemusrsrecconfig
systemusrsrecconfigen.us
systemusrsrecconfigen.usaseline.par
systemusrsrecconfigen.usaseline11k.par
systemusrsrecconfigen.usaseline8k.par
systemusrsrecconfigen.usdictionary
systemusrsrecconfigen.usg2p
systemusrsrecconfigen.usgrammars
systemusrsrecconfigen.usmodels
systemusrsrecconfigen.usdictionaryasic.ok
systemusrsrecconfigen.usdictionarycmu6plus.ok.zip
systemusrsrecconfigen.usdictionaryenroll.ok
systemusrsrecconfigen.usg2pen-US-ttp.data
systemusrsrecconfigen.usgrammarsVoiceDialer.g2g
systemusrsrecconfigen.usmodelsgeneric.swiarb
systemusrsrecconfigen.usmodelsgeneric11.lda
systemusrsrecconfigen.usmodelsgeneric11_f.swimdl
systemusrsrecconfigen.usmodelsgeneric11_m.swimdl
systemusrsrecconfigen.usmodelsgeneric8.lda
systemusrsrecconfigen.usmodelsgeneric8_f.swimdl
systemusrsrecconfigen.usmodelsgeneric8_m.swimdl