一、APK安装目录
1. /data/app --- 普通app安装的目录
该目录，adb需要root权限才能访问
2. /system/app/ --- 系统app安装目录，不可卸载
该目录，adb不需要root权限也能访问
3. /system/priv-app/ --- 系统app安装目录，不可卸载，权限比 system/app 更高
该目录，adb不需要root权限也能访问
4. /system/custom/app --- 系统app安装目录， 可卸载
该目录，adb不需要root权限也能访问
5. /system/custom/private/app --- 系统app安装目录，可卸载，比 system/custom/app 权限更高
该目录，adb不需要root权限也能访问
二、系统API和目录
1. System directories
⚠️ We can't write to these folers
| Method | Result |
|---|---|
| Environment.getDataDirectory() | /data |
| Environment.getDownloadCacheDirectory() | /cache |
| Environment.getRootDirectory() | /system |
2. External storage directories
⚠️ Need WRITE_EXTERNAL_STORAGE Permission
| Method | Result |
|---|---|
| Environment.getExternalStorageDirectory() | /storage/sdcard0 |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_ALARMS) | /storage/sdcard0/Alarms |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM) | /storage/sdcard0/DCIM |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) | /storage/sdcard0/Download |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MOVIES) | /storage/sdcard0/Movies |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_MUSIC) | /storage/sdcard0/Music |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_NOTIFICATIONS) | /storage/sdcard0/Notifications |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) | /storage/sdcard0/Pictures |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PODCASTS) | /storage/sdcard0/Podcasts |
| Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_RINGTONES) | /storage/sdcard0/Ringtones |
3. Application directories
| Method | Result |
|---|---|
| getCacheDir() | /data/data/package/cache |
| getFilesDir() | /data/data/package/files |
| getFilesDir().getParent() | /data/data/package |
4. Application External storage directories
| Method | Result |
|---|---|
| getExternalCacheDir() | /storage/sdcard0/Android/data/package/cache |
| getExternalFilesDir(null) | /storage/sdcard0/Android/data/package/files |
| getExternalFilesDir(Environment.DIRECTORY_ALARMS) | /storage/sdcard0/Android/data/package/files/Alarms |
| getExternalFilesDir(Environment.DIRECTORY_DCIM) | /storage/sdcard0/Android/data/package/files/DCIM |
| getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS) | /storage/sdcard0/Android/data/package/files/Download |
| getExternalFilesDir(Environment.DIRECTORY_MOVIES) | /storage/sdcard0/Android/data/package/files/Movies |
| getExternalFilesDir(Environment.DIRECTORY_MUSIC) | /storage/sdcard0/Android/data/package/files/Music |
| getExternalFilesDir(Environment.DIRECTORY_NOTIFICATIONS) | /storage/sdcard0/Android/data/package/files/Notifications |
| getExternalFilesDir(Environment.DIRECTORY_PICTURES) | /storage/sdcard0/Android/data/package/files/Pictures |
| getExternalFilesDir(Environment.DIRECTORY_PODCASTS) | /storage/sdcard0/Android/data/package/files/Podcasts |
| getExternalFilesDir(Environment.DIRECTORY_RINGTONES) | /storage/sdcard0/Android/data/package/files/Ringtones |
来自github：gist.github.com/lopspower/7…
三、framework目录
1.system/framework/framework.jar
靠，这个jar是空的，里面没有代码。。
在android 5.0之后增加ART机制，所有的framework中的jar被优化了，优化后生成oat文件统一放到了
/system/framework/arm/*.oat中。
未完待续
我会在这篇文章里，持续整理一些重要的系统目录~
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