问题
After searching 1 hour i do not found any solution to my problem.
I want to move a file from sdcard to assets folder and also overwrite the existing file in assets folder (both file are sqlite database have same name with just a little difference in data )
??
回答1:
Actually, The behaviour of the android .apk file is read only so the directory structure which are in that apk file follows the same, So no one can write this files or make changes on that at runtime,that's why You can't make a changes in /asset folder at runtime. you can read file from it (means copy files which are available in asset to any internal storage or /sdcard but not write it to vice-versa)
Its apply on all the directories which are build in .apk files. As per docs.
回答2:
Assets folder are not Writable it is only readable so you cant copy from sdcard to assets, yes you can copy from assets to sdcard
回答3:
If you want other apps not to access your database then what you can do is
- Download the database from website. create a temp database also in app directory.
- getDatabasePath() this will give you the path of the dummy database you have created now replace this with the one you downloaded.
PS.: User and apps having root access still able to access it and you cant do anything in that scenario
来源：https://stackoverflow.com/questions/8399505/copy-file-to-assets-folder