Question

我正在实施一个下载服务，我正在从URL下载图像。一旦服务启动，就会弹出一个通知，显示正在进行下载的进度条。进度条应该每次都更新，它应该显示＆＃34;下载完成＆＃34;下载完成后。但是，一旦下载完成，通知栏就会消失。此外，我无法显示进度更新。我想使用IntentService来实现这一点。请帮忙。以下是我的代码。

public class DownloadService extends IntentService {

private int result = Activity.RESULT_CANCELED;
private String imageUrl = "http://onman.ir/colorfinder/sample.jpg";
private String folderName = "musafir downloads";
private String fileName = "sampleImage.png";
NotificationCompat.Builder notification;
Notification noti;
NotificationManager manager;
private static final int NOTIFICATION_ID = 1;
private File downloadedFile;

public DownloadService() {
    super("Download Service");

}


@Override
protected void onHandleIntent(Intent intent) {

    Log.e("<><>", "Service started");
    createNotification("Download in progress");
    downloadedFile = new File(Environment.getExternalStorageDirectory()+"/"+folderName, fileName);

    if(downloadedFile.exists())
    {
        downloadedFile.delete();
    }

    InputStream is = null;
    FileOutputStream fos = null;
    Bitmap bitmap = null;
    BitmapFactory.Options options = new BitmapFactory.Options();
    options.inSampleSize = 1;

    try{
        Log.e("<><>", "Inside try");
        URL url = new URL(imageUrl);
       /* HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        try{
            conn.setRequestMethod("GET");
            conn.connect();
            if(conn.getResponseCode() == HttpURLConnection.HTTP_OK){
                is = conn.getInputStream();
            }
        }catch (Exception ex)
        {

        }*/
        URLConnection urlConnection = url.openConnection();
        int fileSize = urlConnection.getContentLength();
        Log.e("size", fileSize+"");
        is = urlConnection.getInputStream();
        fos = new FileOutputStream(downloadedFile);

        byte[] data = new byte[fileSize];
        int incr = fileSize/100;
        ByteArrayOutputStream outStream = new ByteArrayOutputStream();
        int count = -1;
        int progress = 0;

        while((count = is.read(data, 0, incr))!=-1)
        {
            progress += count;
            int per = (progress * 100/fileSize);
            outStream.write(data, 0, count);
            publishProgress(per);


        }
        bitmap = BitmapFactory.decodeByteArray(outStream.toByteArray(), 0, data.length);

        bitmap.compress(Bitmap.CompressFormat.PNG, 100, fos);
        fos.flush();

        //successfully finished
        result = Activity.RESULT_OK;

    }catch (Exception ex)
    {

    }finally {
        if(is!=null)
        {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        if(fos!=null)
        {
            try {
                fos.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


    publishResult("Download completed");

    Log.e("<><>", "Download finished");
}

private void publishProgress(final int per) {
    new Thread(new Runnable() {
        @Override
        public void run() {
            notification.setContentText("Download in progress");
            notification.setProgress(100, per, false);
            noti = notification.build();
            noti.flags |= Notification.FLAG_AUTO_CANCEL;
            noti.flags |= Notification.FLAG_NO_CLEAR;
            manager.notify(NOTIFICATION_ID, noti);
           // startForeground(NOTIFICATION_ID, noti);


        }
    });
}

private void publishResult(String status) {
    if(result==Activity.RESULT_OK)
    {
        //notification.setProgress(0, 0, true);
        /*notification.setContentText("Download completed");*/
        /*createNotification("Download completed");*/
        notification.setContentText(status);
        notification.setProgress(0, 0, false);
        noti = notification.build();
        noti.flags |= Notification.FLAG_AUTO_CANCEL;
        noti.flags |= Notification.FLAG_NO_CLEAR;
        manager.notify(NOTIFICATION_ID, noti);
       // startForeground(NOTIFICATION_ID, noti);
    }
}

private void createNotification(String status) {
    Intent notifyintent = new Intent(DownloadService.this, NotificationProcessorActivity.class);

    if(downloadedFile!=null) {
        notifyintent.setAction(Intent.ACTION_VIEW);
        notifyintent.setDataAndType(Uri.fromFile(downloadedFile), "image/*");
    }
    PendingIntent pIntent = PendingIntent.getActivity(this, 1000, notifyintent, 0);


    //Build notification
    notification = (NotificationCompat.Builder) new NotificationCompat.Builder(this)
            .setContentTitle("Image Download")
            .setContentText(status).setSmallIcon(R.mipmap.ic_launcher)
            .setContentIntent(pIntent)
            .setProgress(0,0, true)
            .setSound(RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION));

    noti = notification.build();

    manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
    noti.flags |= Notification.FLAG_AUTO_CANCEL;
    noti.flags |= Notification.FLAG_NO_CLEAR;
    noti.flags |= Notification.PRIORITY_HIGH;
    startForeground(NOTIFICATION_ID, noti);

}

}

Answer 1

通知正在被驳回，因为在publishResult()功能中，您的进度为setProgress(0, 0, false) 尝试做：

setProgress(100, 100, false);

显示下载完成后，通知栏消失

1 个答案: