Question

在我的应用程序中我有4个按钮，当用户点击任何按钮时，它开始下载文件，进度条显示在通知区域中。下载和进度条工作正常，但我有以下两个问题

下载完成后，进度条未关闭，它仍保留在通知区域中
正如我上面说的，我有4个按钮，当点击第一个按钮时，下载开始，当点击其他三个按钮时，立即下载不会发生。我认为它可能在第一次下载完成后开始。但没有任何反应。单击所有按钮时如何显示所有进度条

以下是我的代码（这里我只添加了2个按钮）请帮助我

b1 = (Button)findViewById(R.id.button1);
        b1.setOnClickListener(new View.OnClickListener() 
        {   
            @Override
            public void onClick(View v) 
            {
                i =1;
                Intent intent = new Intent(NotificationProgressTestActivity.this, UploadService.class);
                startService(intent);
            }
        });

        b2 = (Button)findViewById(R.id.button2);
        b2.setOnClickListener(new View.OnClickListener() 
        {   
            @Override
            public void onClick(View v) 
            {
                i = 2;
                Intent intent = new Intent(NotificationProgressTestActivity.this, UploadService.class);
                startService(intent);
            }
        });

接下来是我的 Uplaod Service.class

public class UploadService extends IntentService
{   
    private NotificationManager notificationManager;
    private Notification notification;
    private int progress = 10;
    private static String fileName = "folder/";
    private static URL url;
    public UploadService(String name) 
    {
        super(name);
    }
    public UploadService()
    {
        super("UploadService");
    }
    @Override
    protected void onHandleIntent(Intent intent) 
    {
        notificationManager = (NotificationManager) getApplicationContext().getSystemService(getApplicationContext().NOTIFICATION_SERVICE);
        PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0);
        notification = new Notification(R.drawable.icon,"Uploading file", System.currentTimeMillis());
        notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;
        notification.contentView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.upload_progress_bar);
        notification.contentIntent = contentIntent;
        notification.contentView.setProgressBar(R.id.progressBar1, 100, progress, false);
        notificationManager.notify(42, notification);
        notificationManager.notify(42, notification);
        Thread download = new Thread() 
        {
            @Override
            public void run() 
            {
                Log.e("download", "start");
                try
                {
                    for (int i = 1; i < 100; i++) 
                    {    
                        progress++;
                        notification.contentView.setProgressBar(R.id.progressBar1, 100, progress, false);
                        if(i==1)
                        {  
                            if(NotificationProgressTestActivity.i ==1 )
                            {
                                url = new URL("http://xxxxxxxxxxxxxxxx.mp4");
                            }
                            else if(NotificationProgressTestActivity.i == 2)
                            {
                                url = new URL("http://xxxxxxxxxxxxxxxx.mp4");
                            }
                            HttpURLConnection c = (HttpURLConnection) url.openConnection();
                            c.setRequestMethod("GET");
                            c.setDoOutput(true);
                            c.connect();

                            String PATH = Environment.getExternalStorageDirectory()+ "/";
                            Log.e("PATH:", PATH);
                            File file = new File(PATH);
                            if (!file.exists()) 
                            {
                                file.mkdir();
                                Log.e("destination", "created");
                            } 
                            else 
                            {
                                Log.e("destination", "exist");
                            }
                            File outputFile = new File(file, fileName);
                            FileOutputStream fos = new FileOutputStream(outputFile);

                            InputStream is = c.getInputStream();

                            byte[] buffer = new byte[10171188];
                            int len1 = 0;
                            while ((len1 = is.read(buffer)) != -1) 
                            {
                                fos.write(buffer, 0, len1);
                            }
                            fos.close();
                            is.close();
                            //  -----------------------
                            if (!outputFile.exists()) 
                            {
                                Log.e(outputFile.toString(), "not created");
                            }
                            else 
                            {
                                Log.e(outputFile.toString(), "created");
                                Log.e(outputFile.toString(), "" + outputFile.length());
                            }
                            Log.e("download", "end");
                        }
                        notificationManager.notify(42, notification);
                        try 
                        {
                            Thread.sleep(1017);
                        }
                        catch (InterruptedException e) 
                        {
                            e.printStackTrace();
                        }
                 }
            }
            catch (IOException e) 
            {
                        Log.e("log_tag", "Error: " + e);
            }
            Log.e("log_tag", "Check: ");

                // remove the notification (we're done)
            notificationManager.cancel(42);
        }
     };
        download.run();
    }

Answer 1

PendingIntent contentIntent = PendingIntent.getActivity(this, 0, intent, 0);

1-在上面这一行中，getActivity（）中的第二个参数是requestCode，它应该是每个按钮的唯一编号。目前两个按钮都是0。

notificationManager.notify(42, notification);

2-在上面一行中，您传递的通知索引为42，对于这两个按钮应该是唯一的。目前，无论您创建多少个按钮，它都不会向您显示新的通知，因为您每个通过42个。它会不断更新当前版本。

您也可能需要再次查看您在onHandleIntent（）中执行的代码。有更好的方法来做到这一点。

Answer 2

您需要的是AsyncTask和ListView。你的下载可能发生在AsyncTask中。例如，使用一个Array来指示正在运行的下载以及每个正在运行的下载的进度。现在在你的AsyncTask中有一个publishProgress - 方法调用onProgressUpdate。在onProgressUpdate中，您必须更新相应的进度变量并在ListView适配器上调用notifyDataSetChanged。这将导致ListView重新加载所有数据。最后在您的ListView - 适配器中，您获得了一个方法getView，您必须在其中为ListView的每一行创建视图。在那里，您可以决定是否显示ProgressBar（下载正在运行）。

有关AsyncTask的更多信息，请访问：http://labs.makemachine.net/2010/05/android-asynctask-example/ 关于ListView的更多信息：Android : BaseAdapter how to?

通知区域中的进度条未关闭且未启动第二个进度条

2 个答案: