How to get URI from an asset File?

I have been trying to get the URI path for an asset file.

uri = Uri.fromFile(new File("//assets/mydemo.txt"));

When I check if the file exists I see that file doesn't exist

File f = new File(filepath);
if (f.exists() == true) {
    Log.e(TAG, "Valid :" + filepath);
} else {
    Log.e(TAG, "InValid :" + filepath);
}

Can some one tell me how I can mention the absolute path for a file existing in the asset folder

There is no "absolute path for a file existing in the asset folder". The content of your project's assets/ folder are packaged in the APK file. Use an AssetManager object to get an InputStream on an asset.

For WebView, you can use the file Uri scheme in much the same way you would use a URL. The syntax for assets is file:///android_asset/... (note: three slashes) where the ellipsis is the path of the file from within the assets/ folder.

The correct url is:

file:///android_asset/RELATIVEPATH

where RELATIVEPATH is the path to your resource relative to the assets folder.

Note the 3 /'s in the scheme. Web view would not load any of my assets without the 3. I tried 2 as (previously) commented by CommonsWare and it wouldn't work. Then I looked at CommonsWare's source on github and noticed the extra forward slash.

This testing though was only done on the 1.6 Android emulator but I doubt its different on a real device or higher version.

EDIT: CommonsWare updated his answer to reflect this tiny change. So I've edited this so it still makes sense with his current answer.