DownloadManager downloadManager = new DownloadManager(this);

DownloadTask task = new DownloadTask(this);
task.setUrl("https://github.com/snowdream/android-autoupdate/raw/master/docs/test/android-autoupdater-v0.0.2-release.apk");

downloadManager.add(task, listener); //Add the task
downloadManager.start(task, listener); //Start the task
downloadManager.stop(task, listener); //Stop the task if you exit your APP.

private DownloadListener listener = new DownloadListener<Integer, DownloadTask>() {
    /**
     * The download task has been added to the sqlite.
     * <p/>
     * operation of UI allowed.
     *
     * @param downloadTask the download task which has been added to the sqlite.
     */
    @Override
    public void onAdd(DownloadTask downloadTask) {
        super.onAdd(downloadTask);
        Log.i("onAdd()");
        list.add(downloadTask);
        Log.i(""+downloadTask);
        adapter.notifyDataSetChanged();
    }

    /**
     * The download task has been delete from the sqlite
     * <p/>
     * operation of UI allowed.
     *
     * @param downloadTask the download task which has been deleted to the sqlite.
     */
    @Override
    public void onDelete(DownloadTask downloadTask) {
        super.onDelete(downloadTask);
        Log.i("onDelete()");
    }

    /**
     * The download task is stop
     * <p/>
     * operation of UI allowed.
     *
     * @param downloadTask the download task which has been stopped.
     */
    @Override
    public void onStop(DownloadTask downloadTask) {
        super.onStop(downloadTask);
        Log.i("onStop()");
    }

    /**
     * Runs on the UI thread before doInBackground(Params...).
     */
    @Override
    public void onStart() {
        super.onStart();
        Log.i("onStart()");
    }

    /**
     * Runs on the UI thread after publishProgress(Progress...) is invoked. The
     * specified values are the values passed to publishProgress(Progress...).
     *
     * @param values The values indicating progress.
     */
    @Override
    public void onProgressUpdate(Integer... values) {
        super.onProgressUpdate(values);
        ((DownloadTaskAdapter) getListAdapter()).notifyDataSetChanged();
        Log.i("onProgressUpdate");
    }

    /**
     * Runs on the UI thread after doInBackground(Params...). The specified
     * result is the value returned by doInBackground(Params...). This method
     * won't be invoked if the task was cancelled.
     *
     * @param downloadTask The result of the operation computed by
     *                     doInBackground(Params...).
     */
    @Override
    public void onSuccess(DownloadTask downloadTask) {
        super.onSuccess(downloadTask);
        Log.i("onSuccess()");
    }

    /**
     * Applications should preferably override onCancelled(Object). This method
     * is invoked by the default implementation of onCancelled(Object). Runs on
     * the UI thread after cancel(boolean) is invoked and
     * doInBackground(Object[]) has finished.
     */
    @Override
    public void onCancelled() {
        super.onCancelled();
        Log.i("onCancelled()");
    }

    @Override
    public void onError(Throwable thr) {
        super.onError(thr);
        Log.i("onError()");
    }

    /**
     * Runs on the UI thread after doInBackground(Params...) when the task is
     * finished or cancelled.
     */
    @Override
    public void onFinish() {
        super.onFinish();
        Log.i("onFinish()");
    }
};

DownloadTask task = new DownloadTask(this);
task.setUrl("https://github.com/snowdream/android-autoupdate/raw/master/docs/test/android-autoupdater-v0.0.2-release.apk");
task.setName("taskname");
task.setSize(10240);
task.setPath("/mnt/sdcard/snowdream/android/downloader/android-autoupdater-v0.0.2-release.apk");
task.setId(1);
...