Possible Duplicate:
how we can remove a file from the assets folder at runtime in android?
Is it possible to create a file in assets folder when an application is run and delete the same file when the app is stopped.
For asset you have read file permission only. So you cannot create / delete files in assets folder. Following are the restrictions applied to assets folder.
1) Only Read Permission available for this folder.
2) File size for placing inside the assets limit to 10 MB.If you want to place
then the larger file should be placed as chunk.
3) You can use this folder, for placing files like database file, font file etc...
Don't fight with it. It is not a proper way of dealing with files using assets folder. You can use SDcard that is suitable location for creating and deleting files
You can use standard method for placing files in SDcard through app,
Environment.getExternalStoragePublicDirectory("filetype");