android - 面向3.0+时，将NetworkOnMainThreadException放入可运行内部

由于与ActionBarSherlock有关，我将 list 更改为目标API 16，此后，检查当前播放歌曲的处理程序不再起作用。我在下面标记的行上引发了NetworkOnMainThreadException。

我究竟做错了什么？我以为我已经正确设置了多线程。

这是我的代码:

    handler = new Handler();

    updateSongTask = new Runnable() {
        public void run() {
            Log.d("asdf", "scraper started");
            Scraper scraper = new ShoutCastScraper(); // THIS LINE throws the exception
            List<Stream> streams;
            try {
                streams = scraper.scrape(new URI(url));
                for (Stream stream : streams) {
                    Intent songIntent = new Intent(CUSTOM_INTENT);

                    String[] songAndArtist = songAndArtist(stream.getCurrentSong());
                    songIntent.putExtra("song", songAndArtist[0]);
                    songIntent.putExtra("artist", songAndArtist[1]);
                    songIntent.putExtra("stationurl", url);
                    sendBroadcast(songIntent);
                    Log.d("asdf", "should send broadcast" );

                }
            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            handler.postDelayed(this, 5000);
        }
    };

    handler.postDelayed(updateSongTask, 0);

最佳答案

postDelayed()告诉Android延迟后在主应用程序线程上运行Runnable。它不会在后台线程上运行Runnable。