Use email address as file name in Android

Question

Due to some requirement I want to save text files files to Android's file system and read it anytime programmatically.

For each user who will be using the same phone there will be a different text file stored. Unfortunately, at that time when the user has not logged in the only unique information about the user I have is the email address (or is there anything else?).

So my question is can I use the email address as the filename for these .txt files such as "xyz_123@email.com.txt" since the email address can have multiple special characters which I'm not sure are allowed in filenames?

There is no problem. Just save using email but dont miss the .txt at the end! — Xenolion, Oct 25 '17 at 03:03
I don't think it will work in all cases. There are characters allowed in email addresses that are not allowed in file names. You might be better computing a hash from the email and storing that as the file name. — jwitt98, Oct 25 '17 at 03:14
You should be ok (see https://stackoverflow.com/questions/2679699/what-characters-allowed-in-file-names-on-android) — Stefan, Oct 25 '17 at 03:31

KeLiuyue · Accepted Answer · 2017-10-25T03:21:27.913

Try this .

1.create

String email = "xyz_123@email.com";
File file = new File(email + ".txt");
if (!file.exists()) {
    try {
        file.createNewFile();
    } catch (IOException e) {
        e.printStackTrace();
    }
}
Log.e("FILE_NAME", file.getName());

2.Add permission

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

3.And you could use https://github.com/permissions-dispatcher/PermissionsDispatcher to request permission .

Use email address as file name in Android

1 Answers1