emaillenin

public void downloadUpdate() {
        DownloadManager dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
        String destination = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_DOWNLOADS) + "/";
        String fileName = "your_app.apk";
        destination += fileName;
        final Uri uri = Uri.parse("file://" + destination);

        File file = new File(destination);
        if (file.exists())
            file.delete();