How can i get lifetime Access Token

i have android app connected to my Dropbox folder using access token but every 4 hour should i edit my code and input the new access token is there any method to make the app working 24h without any interact from me

and fix the message that show access token error uploading to Dropbox: expired access token

private void uploadToDropbox(File photoFile) {
    if (photoFile == null || !photoFile.exists()) {
        runOnUiThread(() -> Toast.makeText(MainActivity.this, "Error: Photo file does not exist", Toast.LENGTH_SHORT).show());
        return;
    }

    DbxRequestConfig config = DbxRequestConfig.newBuilder("Decamera").build();
    DbxClientV2 client = new DbxClientV2(config, DROPBOX_ACCESS_TOKEN);

    try {
        String remotePath = "/Decamera/" + photoFile.getName();

        try (InputStream in = new FileInputStream(photoFile)) {
            client.files().uploadBuilder(remotePath)
                    .withMode(WriteMode.ADD)
                    .uploadAndFinish(in);

            runOnUiThread(() -> Toast.makeText(MainActivity.this, "Photo uploaded to Dropbox", Toast.LENGTH_SHORT).show());
        }

    } catch (Exception e) {
        e.printStackTrace();
        runOnUiThread(() -> Toast.makeText(MainActivity.this, "Error uploading to Dropbox: " + e.getMessage(), Toast.LENGTH_SHORT).show());
    }
}

private static final String DROPBOX_ACCESS_TOKEN = my access token