Android的问题，进度对话框 [英] android problem with progress dialog

问题描述

在我的应用程序I M试图获取来自服务器的数据，并在数据库中存储。
当这样做当时progressdialog所有这些工作，我想应该显示，如果成功读取数据然后对话框应该关闭一些alertDialog应该显示消息成功获取数据。如果任何N / W有问题，那么就应该表现出不同的味精说：有n个问题/ W。

In my app i m trying to fetch data from server and storing in database. When it is doing all these work i want at that time progressdialog should show, if successfully data fetches then dialog should close and some alertDialog should show for msg "successfully data fetched". and if any n/w problem there, then it should show different msg that "problem with n/w".

对于我这样做像下面，

public void onClick(View arg0) {
                myProgressDialog = ProgressDialog.show(
                        getParent(), "Please wait...",
                        "Doing upgrade...", true);
                new Thread() {
                    public void run() {
                        try {

                        upgradeAll();//function where data fetched from server

                            sleep(5000);

                        } catch (Exception e) {
                        }
                        // Dismiss the Dialog

                        myProgressDialog.dismiss();


                        Toast.makeText(UpgradeAllTableData.this, "Due to some internal problem \n" +
                                "it couldnot update..", Toast.LENGTH_LONG).show();
                    }

                }.start();
            }

AsyncTask的code，

AsyncTask code,

private class UpgradeTask extends AsyncTask<Context, Void, Void> {
        private ProgressDialog Dialog = new ProgressDialog(UpgradeAllTableData.this);

        @Override
        protected void onPreExecute() {
            System.out.println("In onPreExecute ");
            Dialog.setTitle("Loading");
            Dialog.setMessage("Please wait for few seconds...");
            Dialog.show();
        }

        @Override
        protected Void doInBackground(Context... params) {
            System.out.println("In doInBackground ");

            upgradeAll();

            System.out.println("In doInBackground after fetching");
            return null;
        }

        @Override
          protected void onPostExecute(Void unused) {

            System.out.println("In onPostExecute ");
            Dialog.dismiss();

            Toast.makeText(UpgradeAllTableData.this, "Problem with internet" ,  Toast.LENGTH_SHORT).show();
            alertboxNeutral("Warning", "Problem with Internet Connection", "Okay","Try again");

        }
    }

问题是吐司没有显示。为什么？

Problem is Toast is not showing. why?

我的问题是条件，在这里给它，这样，如果有n任何问题/ W则表现出一定的味精和成功然后显示另一个味精。

My question is which condition and where to give so that if any problem with n/w then it show some msg and success then show another msg.

在哪里我应该写code是什么？
给我一些建议。

Where i should write code for that? Give me some suggestion.

感谢您

推荐答案

你在做什么是完全错误的。 UI线程处理所有用户界面的变化，但在这里，你是在UI线程创建ProgressDialog和其他线程贬..一个解决方案是使用的AsyncTask的 http://developer.android.com/reference/android/os/AsyncTask.html

What you are doing is totally wrong. UI thread handles all UI changes, but here you are creating ProgressDialog in UI thread and dismissing it in some Other Thread.. A solution is make use of AsyncTask http://developer.android.com/reference/android/os/AsyncTask.html

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