Updating progressbar from IntentService?

Question

我正在尝试更新集成在我的通知栏中的进度条，但我似乎无法让它工作。我大概知道为什么它不工作，但我不知道如何解决它。这是代码:

public class DownloadService extends IntentService{
     public DownloadService() {
        super("DownloadService");

    }
       @Override
       public void onCreate() {
           super.onCreate();
           ctx = getApplicationContext();
           root = new File(Environment.getExternalStorageDirectory()+"/folder-videos/");
           if(root.exists() && root.isDirectory()) {
           }else{
               root.mkdir();
           }          
           notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
           PendingIntent contentIntent = PendingIntent.getActivity(this, 0, null, 0);
           notification = new Notification(R.drawable.icon, "App", System.currentTimeMillis());
           contentView = new RemoteViews(getPackageName(), R.layout.progress_layout);
           notification.flags = Notification.FLAG_AUTO_CANCEL;
           notification.contentView = contentView;
           notification.contentIntent = contentIntent;
           contentView.setProgressBar(R.id.status_progress, 100, 0, false);        
           contentView.setTextViewText(R.id.status_text,"Downloading...");  
       }
        @Override
    protected void onHandleIntent(Intent intent) {
        Intent broadcastIntent = new Intent();
        int count;
        String full_url = URL + intent.getStringExtra(VIDEOS);
        try {
            URL url = new URL(full_url);
            URLConnection conexion = url.openConnection();
            conexion.connect();
            File file = new File(root.getPath(), intent.getStringExtra(VIDEOS));
            int lenghtOfFile = conexion.getContentLength();
            Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
            InputStream input = new BufferedInputStream(url.openStream());
            OutputStream output = new FileOutputStream(file);
            byte data[] = new byte[1024];
            long total = 0;
            contentView.setTextViewText(R.id.status_text,"Downloading " + intent.getStringExtra(VIDEOS));  
            while ((count = input.read(data)) > 0) {
               total += count;      
               notification.contentView.setProgressBar(R.id.status_progress, 100,(int)((total*100)/lenghtOfFile), false);       
               Log.e("totaltotal","" + (int)((total*100)/lenghtOfFile));
               output.write(data, 0, count);

            } 
            notificationManager.notify(1,notification);
            output.flush();
            output.close();
            input.close();
        } catch (Exception e) {
            Log.e("PRINTSTACK","STACK:" + e.getMessage());
            e.printStackTrace();
        }
    }
}

我知道我必须调用:notificationManager.notify(1,notification);在while循环中，我试过了，但它冻结了应用程序并使其崩溃。有没有其他方法可以通知通知管理器进度条的更新?

谢谢! !

Answer 1

尽量只使用几次notificationManager.notify(1,notification);

如:

int lastProgressUpdate=0;
while(...)
{
    if(progress%5==0 && progress!=lastProgressUpdate)
    {
         notificationManager.notify(1,notification);
         lastProgressUpdate=progress;
    }
}