pressing按钮，继续下一个意图，ProgressDialog

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我要显示一个ProgressDialog时，我的应用程序上传图片。由于上传图片可能需要相当长一段时间。现在我有2 Asynctasks，一个上传图片到服务器，以及一个用于发送电子邮件。发送电​​子邮件之后，下一个意图弹出。

I want to show a ProgressDialog when my app is uploading an image. As uploading an image can take quite a while. Now I have 2 Asynctasks, one for uploading an Image to the server, and one for sending the email. After sending the email, the next intent should pop up.

这是code我的下一个按钮：

This is the code for my next Button:

public void next(View view) { Intent intent = new Intent(Step4.this, Step5.class); intent.putExtra(EXTRA_MESSAGE, (Serializable) _user); intent.putExtra(EXTRA_MESSAGE2, _isRepairable); intent.putExtra(EXTRA_MESSAGE3, _injury); intent.putExtra(EXTRA_MESSAGE4, _category); intent.putExtra(EXTRA_MESSAGE5, _inch); intent.putExtra(EXTRA_MESSAGE6, _size); mailing(_isRepairable); new UploadImageTask().execute(); startActivity(intent); }

这是我的UploadImageTask（）

This is my UploadImageTask()

private class UploadImageTask extends AsyncTask<Void, Void, Integer> { ProgressDialog dialog; StopWatch sw = new StopWatch(); @Override protected void onPreExecute() { super.onPreExecute(); dialog = new ProgressDialog(Step4.this); dialog.show(); } protected Integer doInBackground(Void... params) { if (isPhotoTaken()) { sw.start(); ImageUploader.uploadFile(getPhotoPath(), "obo.nl/android-upload-image.php", Step4.this); sw.stop(); Debug.out(sw.getTime()); } return null; } protected void onPostExecute(Integer result) { dialog.dismiss(); new MyAsyncTask().execute(_mail); } }

这是我的MyAsyncTask

This is my MyAsyncTask

private class MyAsyncTask extends AsyncTask<Mail, Integer, Double> { /** * Private boolean to check if a tire is repairable or not.</br> */ boolean _repairable = Step4._isRepairable; /** * Private integer which counts how many times we've tried to send the * Email. */ private int _counter = 0; @Override protected void onPreExecute() { super.onPreExecute(); } /** * Method used to start {@link #postData(Mail)} on a background thread. * * @return null */ @Override protected Double doInBackground(Mail... params) { postData(params[0]); return null; } /** * Method used to send the mail through a JSON Request in combination * with the website. If there is no Internet connection the program will * try to send the mail every 10 seconds. * * @param valueIWantToSend */ public void postData(Mail valueIWantToSend) { if (AppStatus.haveNetworkConnection(_context)) { HttpClient httpclient = new DefaultHttpClient(); HttpPost httppost = new HttpPost( "obo.nl/android-mailing.php"); try { List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(); nameValuePairs.add(new BasicNameValuePair("from", valueIWantToSend.getFrom())); nameValuePairs.add(new BasicNameValuePair("to", valueIWantToSend.getTo())); nameValuePairs.add(new BasicNameValuePair("subject", valueIWantToSend.getSubject())); nameValuePairs.add(new BasicNameValuePair("message", valueIWantToSend.getBody())); nameValuePairs.add(new BasicNameValuePair("localized", getResources().getConfiguration().locale .getDisplayName())); if (PathToPDF(_repairable).contains("Goed_Gekeurd_NL")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_BANDENANALYSE_GOED_GEKEURD_PATH)); } else if (PathToPDF(_repairable).contains("Afgekeurd_NL")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_BANDENANALYSE_AFGEKEURD_PATH)); } else if (PathToPDF(_repairable).contains( "Goed_Gekeurd_FR")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_ANALYSEPNEUS_GOED_GEKEURD_PATH)); } else if (PathToPDF(_repairable).contains("Afgekeurd_FR")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_ANALYSEPNEUS_AFGEKEURD_PATH)); } else if (PathToPDF(_repairable).contains( "Goed_Gekeurd_DE")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_REIFENANALYSE_GOED_GEKEURD_PATH)); } else if (PathToPDF(_repairable).contains("Afgekeurd_DE")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_REIFENANALYSE_AFGEKEURD_PATH)); } else if (PathToPDF(_repairable).contains( "Goed_Gekeurd_EN")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_TYREANALYSE_GOED_GEKEURD_PATH)); } else if (PathToPDF(_repairable).contains("Afgekeurd_EN")) { nameValuePairs.add(new BasicNameValuePair( "outputResult", SERVER_TYREANALYSE_AFGEKEURD_PATH)); } if (isPhotoTaken()) { nameValuePairs.add(new BasicNameValuePair("photo", getPhotoPath())); } httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs)); ResponseHandler<String> responseHandler = new BasicResponseHandler(); String response = httpclient.execute(httppost, responseHandler); // This is the response from a php application String reverseString = response; Log.i("info", reverseString); } catch (ClientProtocolException e) { } catch (IOException e) { } } else { if (_counter == 0) { _counter++; _activity.runOnUiThread(new Runnable() { public void run() { Toast.makeText(_context, getString(R.string.noInternetEmailNotSend), Toast.LENGTH_LONG).show(); } }); } try { Thread.sleep(10000); } catch (InterruptedException e) { e.printStackTrace(); } postData(valueIWantToSend); } } }

所以，我怎么可以让这样的ProgressDialog显示出来，同时上传（现在它显示了几秒钟（比如3秒），同时上传需要15 - 这里20秒。对话框应达整个20秒，而不是仅3秒。对话框关闭也时，已经进入下一意图。虽然它实际上应该进入下一个意图在20秒内，而不是3秒。

So how can i make it like that the ProgressDialog shows up while uploading (for now it shows up for a few seconds (say 3 seconds) while uploading takes 15 - 20 seconds here. The Dialog should be up for the whole 20 seconds instead of only 3 seconds. Also when the dialog closes, it already goes to the next intent. While it actually should go to the next intent in 20 seconds instead of 3 seconds.

推荐答案

您可以做的是通过步骤4的进度对话框中MyAsyncTask当您使用执行MyAsyncTask 新MyAsyncTask（）。执行（_mail）

what you can do is pass your progress dialog of step4 in MyAsyncTask when you execute MyAsyncTask using new MyAsyncTask().execute(_mail)

MyAsyncTask

private class MyAsyncTask extends AsyncTask<Mail, Integer, Double> { private ProgressDialog progress = null // create constructor to get ProgressDialog passed from onPostExecute of your UploadImageTask public MyAsyncTask (ProgressDialog progress) { this.progress = progress; } // now continue `this.progress` here and dismiss `this.progress` on `onPostExecute` method here }

您UploadImageTask的onPostExecute

protected void onPostExecute(Integer result) { // remove dialog.dismiss(); // dont dismiss dialog here. MyAsyncTask async = new MyAsyncTask(dialog) // pass your current dialog async.execute(_mail); }

对不起任何错字。希望这将有助于

sorry for any typo . hope this will help