Is it possible to move almost the total app size of an app to external sd? example 90% of its data will move to external and the 10% will stay...

I've tried moving the Clean Master app, its total size is 71 MB but only 20 MB was able to move in the external... not even 50% of total size has been moved...

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    The default mechanism of moving an app only moves the APK of the app. App's private data (including cache) always remains in internal storage (under /data/data). – Firelord Feb 18 '16 at 1:35
  • @Firelord, wow - that's an interesting tidbit on how Android works. I'm curious to research that more. I always assumed an app running on SD would attempt to put all of it's other files on the SD too. I figured that's why the SD card ends up with all those other folders I didn't create. – Baronz Feb 18 '16 at 3:14
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    @Baronz You can begin from here: developer.android.com/guide/topics/data/install-location.html – Firelord Feb 18 '16 at 3:25
  • Please see this new article 2017/02/10 10 most useless apps and games for Android. Most prominent, but specifically named in the list: Clean Master (along with quote-Booster apps, Anti-Virus apps, and Task Killers-unquote) – wbogacz Feb 12 '17 at 2:04

Easy approach: Link2SD

Manual method:
If you are sure that the file attributes does not matter, then there's an acceptable way to do this. Root is required.
1. Copy the app data from /data/data/com.example.foo to somewhere in your SD card. Personally I recommend sdcard/Android/data/com.example.foo. If you are running Android Lollipop or up, there will be a symbolic link named lib, leave it alone. 2. Kill the app process. Remove the original data. Open a terminal emulator (or adb). Run

ln -s /sdcard/Android/data/com.example.foo/files /data/data/com.example.foo/files

That's all. To revert this job, it's a little complex. You'll have to chmod and chown the proper file modes and attributes manually after copying them back.

Special notices: Never copy and link the /data/data/com.example.foo folder directly as the symbolic link lib inside will fail, which will lead to unknown behavior. Link every (or some of them at your choice) subfolders one by one.

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