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I can read from a csv file in the assets folder, using opencsv. However, writing to the file was a bit more mysterious.

I do the following to open up a file in the /assets folder for reading:

CSVReader reader = new CSVReader(new InputStreamReader(getAssets().open("shoppinglists.csv")));

How do I open the file for writing, and how to I do the writing? Using getAssets() for accessing the file seams clean, so I'd like to use it for reading also.

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  • Sorry.. You can't. As android .apk file structure is Read-Only.. Better to use Application's Internal Storage or External Storage. Commented Aug 17, 2012 at 12:27

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You probably can't write to the asset file as it is part of the APK.

If I were you, I would copy the asset file into your temp directory and write to that copy as required.

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Ah, crap. I suspected that. But this is a file that's going to live with the application, so temo folder is a bad idea. Where is a good idea to keep a "database" file for the application?
In the data directory, see the Context class
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Assets folder is present in the packaged apk. It is read only. So you cannot write to it.

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You can use Context.getDir to get the directory where you can store your files. Or if it is temporary you could call Context.getCacheDir

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