Question

我研究了这个并没有找到一个明确的答案，它结合了进度条+状态栏+服务？我的问题是文件上传的实现方式（由于服务器支持它的唯一方式），我无法跟踪正在写入的字节数。因此，我无法正确递增进度条以反映准确的文件上载状态。当前实现增加进度条，上传并在进度条达到100时删除进度条。但是进度不能准确反映上载。上传发生得更早，但酒吧保持开启状态。我希望在发出此请求/响应时显示进度。以下是我的代码段：

  public class UploadFileService extends IntentService {
    public UploadFileService() {
super("UploadFileService");
}

@Override
protected void onHandleIntent(Intent intent) {
    fName = intent.getExtras().getString(Constants.EXTRA_K_FILENAME);
    path = intent.getExtras().getString(Constants.EXTRA_K_FILEPATH);
            attribute = intent.getExtras().getString(Constants.EXTRA_K_ATTRIBUTE);

//Start thread to doFilepUpload
uploadthread = new UploadThread(fName, path, attribute);
uploadthread.start();

}

//定义从线程接收消息并更新进度的处理程序

    final Handler handler = new Handler() {
    public void handleMessage(Message msg) {

        Integer total = msg.arg1;
        notification.contentView.setProgressBar(R.id.status_progress, 100, total, false);
        nm.notify(NOTIFICATION_ID, notification);



        if ( total.equals(100)  && getResponse() != null ){
            // inform the progress bar of updates in progress
            uploadthread.setState(UploadThread.STATE_DONE);

            Intent broadcastIntent = prepareBroadcast();
            // remove the notification (we're done)
            nm.cancel(NOTIFICATION_ID);
            sendBroadcast(broadcastIntent);
        }
    }
};


public class UploadThread extends Thread {

    private String name;
    private String path;
    private String attribute;
    final static int STATE_DONE = 0;
    final static int STATE_RUNNING = 1;
    int mState;
    int total;


    public UploadThread(String fName, String path, String attribute) {
        // TODO Auto-generated constructor stub
        this.name = fName;
        this.path = path;
        this.attribute = attribute;
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        setResponse(doFileUpload(name, path, attribute));

        if( getResponse() != null){
                            // house keeping for the application
            if(response.result.equalsIgnoreCase("success")){
                saveFileName = response.data.savedFileName;
                responseMessage = response.message;
            }else if (response.result.equalsIgnoreCase("error") || 
         response ==  null ){
                responseMessage = response.message; 
                saveFileName = null;
                originalName = fName;
            }
        }

        mState = STATE_RUNNING;   
        total = 0;
        while (mState == STATE_RUNNING && total <=100) {
            try {
                Log.d(TAG, "^^ Thread.sleep");
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                Logger.e("ERROR", "Thread Interrupted");
            }
            Message msg = handler.obtainMessage();
            msg.arg1 = total;
            handler.sendMessage(msg);
            total++;
        }
    }

    /* sets the current state for the thread,
     * used to stop the thread */
    public void setState(int state) {
        mState = state;
    }

}

有没有人对如何更新进度条以显示正确的上传进度有任何建议/想法？文件上传过程：

    paramString = p.getName()+"="+URLEncoder.encode(p.getValue(), HTTP.UTF_8);
                    } catch (UnsupportedEncodingException e) {
                        Log.e(TAG, "unsupported encoding --> 
           name="+p.getName()+"; value="+p.getValue(), e);
                        throw e;
                    }
                    if (combinedParams.length() > 1) {
                        combinedParams += "&" + paramString;
                    } else {
                        combinedParams += paramString;
                    }
                }
            }

            request = new HttpPost(url + combinedParams);

            MultipartEntity entity = new MultipartEntity();

            // add headers
            for (NameValuePair h : headers) {               
                request.addHeader(h.getName(), h.getValue());
            }

            // add cookies
            for(NameValuePair c : cookies) {            
                request.addHeader(H_COOKIE,          
                         c.getName()+"="+c.getValue());                 
            }           
                 entity.addPart(uploadFile.getName(), new FileBody(uploadFile));

            request.setEntity(entity)

Answer 1

我找到了解决这个问题的方法。它不是一个理想的解决方案，但由于不可能计算字节数，我采用了这种方法。在我创建的上传服务中，我有2个不同的线程。线程＃1，上传和线程＃2，维护通知区域中的进度条。线程＃2取决于＃1。当＃1处于活动状态时，线程＃2递增1并且休眠1秒，并且随着每个进度增量，休眠间隔增加0.2秒。如果上传完成，例如45％，则进度条跳至100％。

如何使用服务在文件上载时更新状态栏中的进度条？

1 个答案: