我有一个android应用程序，它的主要活动，数据从sqlite数据库改编，并显示在列表视图。我试图使用进度对话框在从数据库获取数据期间向用户显示“加载”消息。但对话不会消失。ProgressDialog不消失在Android应用程序

下面是代码：

public class BirthdayAlarmActivity extends ListActivity {

List listofAvailableBirthdays;

ProgressDialog pDialog;

@Override

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.birthday_list);

listofAvailableBirthdays=new ArrayList();

ReinitializeList();

}

@Override

protected void onResume() {

ReinitializeList();

}

void ReinitializeList()

{

new LoadListView().execute();

if(listofAvailableBirthdays.size()>0)

{

//get ready the adapter

ArrayAdapter ara=

new MyArrayAdapter(BirthdayAlarmActivity.this,listofAvailableBirthdays);

//set the adapter

setListAdapter(ara);

}

}

public class LoadListView extends AsyncTask

{

//ProgressDialog pDialog;

@Override

protected void onPreExecute() {

// Showing progress dialog before sending http request

pDialog = new ProgressDialog(

BirthdayAlarmActivity.this);

pDialog.setMessage("Please wait..");

pDialog.setIndeterminate(true);

pDialog.setCancelable(false);

pDialog.show();

}

protected Void doInBackground(Void... unused) {

runOnUiThread(new Runnable() {

public void run() {

// increment current page

listofAvailableBirthdays.clear();

listofAvailableBirthdays=BirthdayHandler.GetTenBirthDays(BirthdayAlarmActivity.this);

}

});

return (null);

}

protected void onPostExecute(Void unused) {

// closing progress dialog

pDialog.dismiss();

}

}

+0

如果您在UI线程上运行doInBackground的所有代码，那么使用AsyncTask有什么意义？ –

2012-03-18 10:23:26

+0

我是多线程的概念的新手，并从这个示例中学习它[http://www.androidhive.info/2012/03/android-listview-with-load-more-button/]。我该怎么办 ？ –

2012-03-18 10:30:45