How to write files to assets folder or raw folder in android?

The question:

I am working on some application where I have to update some files present in assets / raw folder runtime from some http location.

Can anyone help me to by sharing how to write files in assets or raw folder?

The Solutions:

Below are the methods you can try. The first solution is probably the best. Try others if the first one doesn’t work. Senior developers aren’t just copying/pasting – they read the methods carefully & apply them wisely to each case.

Method 1

It cannot be done. It is impossible.

Method 2

Why not update the files on the local file system instead?
You can read/write files into your applications sandboxed area.

Other alternatives you may want to look into are Shared Perferences and using Cache Files (all described at the link above)

Method 3

You cannot write data’s to asset/Raw folder, since it is packed(.apk) and not expandable in size.

If your application need to download dependency files from server, you can go for APK Expansion Files provided by android (

Method 4

Another approach for same issue may help you
Read and write file in private context of application

                 String NOTE = "note.txt";  
                 private void writeToFile() {
        try {
         OutputStreamWriter out = new OutputStreamWriter(openFileOutput(
                NOTES, 0));


        catch (Throwable t) {
        Toast.makeText(this, "Exception: " + t.toString(), 2000).show();

           private void ReadFromFile()
        try {
        InputStream in = openFileInput(NOTES);
        if (in != null) {
            InputStreamReader tmp = new InputStreamReader(in);
            BufferedReader reader = new BufferedReader(tmp);
            String str;
            StringBuffer buf = new StringBuffer();
            while ((str = reader.readLine()) != null) {
                buf.append(str + "n");
            String temp = "Not Working";
            temp = buf.toString();
            Toast.makeText(this, temp, Toast.LENGTH_SHORT).show();
    } catch ( e) {
        // that's OK, we probably haven't created it yet
    } catch (Throwable t) {
        Toast.makeText(this, "Exception: " + t.toString(), 2000).show();

Method 5

You Can’t write JSON file while in assets. as already described assets are read-only. But you can copy assets (json file/anything else in assets ) to local storage of mobile and then edit(write/read) from local storage. More storage options like shared Preference(for small data) and sqlite database(for large data) are available.

All methods was sourced from or, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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