O Download não é executado nos celulares com as novas versões do android, alguma dica?

botao.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        EditText campoUrl = (EditText) findViewById(R.id.formulario_URL);
        String url = campoUrl.getText().toString();
        if (url != null && !url.isEmpty() && verificaConexao() ) {
                DownloadManager downloadManager =
                        (DownloadManager) getSystemService(DOWNLOAD_SERVICE);

                DownloadManager.Request request = new DownloadManager.Request(Uri.parse(url));
                long downloadId = downloadManager.enqueue(request);

                DownloadApplication app = (DownloadApplication) getApplication();
                app.downloadsAtivos.add(downloadId);

        }else if (!verificaConexao()){
            Toast.makeText(FormularioMidiaActivity.this, "Não foi possivel fazer download, sem conexão no momento.", Toast.LENGTH_LONG).show();
        }

    }
});

public class DownloadReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        long downloadId = intent.getExtras().getLong(DownloadManager.EXTRA_DOWNLOAD_ID);

        DownloadApplication app =
                (DownloadApplication) context.getApplicationContext();

        if (app.downloadsAtivos.indexOf(downloadId) != -1) {
            DownloadManager.Query query = new DownloadManager.Query();
            query.setFilterById(downloadId);

            DownloadManager downloadManager =
                    (DownloadManager) context.getSystemService(Context.DOWNLOAD_SERVICE);
            Cursor cursor = downloadManager.query(query);

            if (cursor.moveToFirst()) {
                String uri =
                        cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_LOCAL_URI));
                String mime =
                        cursor.getString(cursor.getColumnIndex(DownloadManager.COLUMN_MEDIA_TYPE));

                Intent abreArquivoIntent = new Intent(Intent.ACTION_VIEW);
                abreArquivoIntent.setDataAndType(Uri.parse(uri), mime);

                PackageManager packageManager = context.getPackageManager();
                if (packageManager.resolveActivity(abreArquivoIntent, 0) != null) {
                    PendingIntent acaoPendente =
                            PendingIntent.getActivity(context, 0,
                                    abreArquivoIntent, PendingIntent.FLAG_CANCEL_CURRENT);

                    Notification notificacao = new NotificationCompat.Builder(context)
                            .setContentTitle("Download concluído!")
                            .setContentText(uri)
                            .setSmallIcon(android.R.drawable.ic_menu_slideshow)
                            .setAutoCancel(true)
                            .setContentIntent(acaoPendente)
                            .build();

                    NotificationManager notificationManager =
                            (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
                    notificationManager.notify(123, notificacao);
                    Toast.makeText(context,
                            "Download concluído", Toast.LENGTH_SHORT).show();
                } else {
                    Toast.makeText(context,
                            "Não tem aplicativo para abrir o download", Toast.LENGTH_SHORT).show();
                }
            }

            cursor.close();

            app.downloadsAtivos.remove(downloadId);
        }
    }
}