Question

我有一个带有“下载”按钮的活动，它会激活在IntentService中实现的DownloadManager。一切都很好，我的问题是：

是否可以从我的DownloadService（扩展的IntentService）显示ProgressBar或ProgressDialog，但通知栏中显示的进度除外？

你能写一个示例代码或伪代码，我怎么能这样做？谢谢

Answer 1

是否可以显示我的ProgressBar或ProgressDialog   DownloadService（扩展的IntentService），进度除外   显示在通知栏中？

你能写一个示例代码或伪代码，我怎么能这样做？谢谢   你

您可以使用ResultReceiver来实现目标。 ResultReceiver实现了Parcelable，因此您可以将其传递给IntentService，如：

Intent i = new Intent(this, DownloadService.class);
i.putExtra("receiver", new DownReceiver(new Handler()));
<context>.startService(i);

然后在 onHandlerIntent（）中，您需要的是获取传递给Intent的接收者并将当前进度发送到ResultReceiver中：

protected void onHandleIntent(Intent intent) {  

   // obtaining ResultReceiver from Intent that started this IntentService
   ResultReceiver receiver = intent.getParcelableExtra("receiver");

   ...

   // data that will be send into ResultReceiver
   Bundle data = new Bundle();
   data.putInt("progress", progress);

   // here you are sending progress into ResultReceiver located in your Activity
   receiver.send(Const.NEW_PROGRESS, data);
}

ResultReceiver 将处理数据，并将在 ProgressDialog 中进行更新。以下是ResultReceiver的实现（将其作为Activity类的内部类）：

private class DownReceiver extends ResultReceiver {

   public DownloadReceiver(Handler handler) {
      super(handler);
   }

   @Override
   public void onReceiveResult(int resultCode, Bundle resultData) {
      super.onReceiveResult(resultCode, resultData);
      if (resultCode == Const.NEW_PROGRESS) {
         int progress = resultData.getInt("progress");

         // pd variable represents your ProgressDialog
         pd.setProgress(progress);
         pd.setMessage(String.valueOf(progress) + "% downloaded sucessfully.");
      }
   }
}

显示IntentService的ProgressBar或Dialog以获取下载进度

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