我想在我的应用上传图片时显示ProgressDialog。 上传图片可能需要一段时间。 现在我有2个Asynctasks，一个用于将图像上传到服务器，另一个用于发送电子邮件。发送电子邮件后，应弹出下一个意图。
这是我下一个按钮的代码：
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（）
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(),
"http://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
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(
"http://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);
}
}
}
那么我怎样才能使ProgressDialog在上传过程中显示出来（现在它显示几秒钟（比如3秒），而在这里上传需要15-20秒。 对话框应该整整20秒，而不是仅仅3秒。 此外，当对话框关闭时，它已经转到下一个意图。虽然它实际上应该在20秒而不是3秒内进入下一个意图。
答案 0 :(得分：1)
请勿关闭 UploadImageTask
中的对话框protected void onPostExecute(Integer result) {
// dialog.dismiss();
new MyAsyncTask().execute(_mail);
}
但在 MyAsyncTask
中解雇相同的内容 protected void onPostExecute(Integer result) {
if (dialog.isShowing())
{
dialog.dismiss();
}
}
答案 1 :(得分：1)
当您使用new MyAsyncTask().execute(_mail)
<强> 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
}
onPostExecute of UploadImageTask
protected void onPostExecute(Integer result)
{
// remove dialog.dismiss(); // dont dismiss dialog here.
MyAsyncTask async = new MyAsyncTask(dialog) // pass your current dialog
async.execute(_mail);
}