English 中文(简体)
• 如何在不停运行的情况下创建/雇用Run AsyncTask
原标题:How to Create/Run AsyncTask in Service without runOnUiThread()

我有<条码>服务,为下载文件创建<条码>。 在活动中,我们建立了<条码> 不可更改或<条码>,我们通过<条码>。 我可以从一个服务处获取这一方法,因此,我如何正确使用<条码>AyncTask,(在不阻挡天线的情况下做大量的工作)?

最佳回答

如果你只要求你提供服务,而且你可以把它变成一个单一州,那么就试图这样做:

public class FileDownloaderService extends Service implements FileDownloader {
    private static FileDownloaderService instance;

    public FileDownloaderService () {
        if (instance != null) {
            throw new IllegalStateException("This service is supposed to be a singleton");
        }
    }

    public static FileDownloaderService getInstance() {
        // TODO: Make sure instance is not null!
        return instance;
    }

    @Override
    public void onCreate() {
        instance = this;
    }

    @Override
    public IBinder onBind(@SuppressWarnings("unused") Intent intent) {
        return null;
    }

    @Override
    public void downloadFile(URL from, File to, ProgressListener progressListener) {
        new Thread(new Runnable() {
            @Override
            public void run() {
                // Perform the file download
            }
        }).start();
    }
}

现在,你可以直接要求你服务。 因此,仅打电话downloadFile()使服务投入工作。

问 问 问 问 题 通知该方法收到<编码>ProgressListener。 它不妨这样做:

public interface ProgressListener {
    void startDownloading();
    void downloadProgress(int progress);
    void endOfDownload();
    void downloadFailed();
}

现在,你刚刚从活动(不是从服务机构)中更新了国际律师联合会,而后者仍然不知道国际律师联合会如何看待。

问题回答

暂无回答




相关问题
Android - ListView fling gesture triggers context menu

I m relatively new to Android development. I m developing an app with a ListView. I ve followed the info in #1338475 and have my app recognizing the fling gesture, but after the gesture is complete, ...

AsyncTask and error handling on Android

I m converting my code from using Handler to AsyncTask. The latter is great at what it does - asynchronous updates and handling of results in the main UI thread. What s unclear to me is how to handle ...

Android intent filter for a particular file extension?

I want to be able to download a file with a particular extension from the net, and have it passed to my application to deal with it, but I haven t been able to figure out the intent filter. The ...

Android & Web: What is the equivalent style for the web?

I am quite impressed by the workflow I follow when developing Android applications: Define a layout in an xml file and then write all the code in a code-behind style. Is there an equivalent style for ...

TiledLayer equivalent in Android [duplicate]

To draw landscapes, backgrounds with patterns etc, we used TiledLayer in J2ME. Is there an android counterpart for that. Does android provide an option to set such tiled patterns in the layout XML?

Using Repo with Msysgit

When following the Android Open Source Project instructions on installing repo for use with Git, after running the repo init command, I run into this error: /c/Users/Andrew Rabon/bin/repo: line ...

Android "single top" launch mode and onNewIntent method

I read in the Android documentation that by setting my Activity s launchMode property to singleTop OR by adding the FLAG_ACTIVITY_SINGLE_TOP flag to my Intent, that calling startActivity(intent) would ...

From Web Development to Android Development

I have pretty good skills in PHP , Mysql and Javascript for a junior developer. If I wanted to try my hand as Android Development do you think I might find it tough ? Also what new languages would I ...

热门标签