我在onPreExecute函数执行时有一个AsyncTask，它给了我一个例外
** java.lang.IllegalStateException：视图com.android.internal.policy.impl.PhoneWindow$DecorView@44ea0e20已经添加到窗口中经理。**
当progressDialog的show（）方法被调用时。
我的活动
public class TopNewsActivity extends ListActivity {
public static final String LOG_TAG = "Infra";
private ProgressDialog progressDialog;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listplaceholder);
new BackgroundAsyncTask().execute();
}
public class BackgroundAsyncTask extends AsyncTask<String, Integer, ArrayList<HashMap<String, String>>> {
@Override
protected void onPreExecute() {
super.onPreExecute();
progressDialog = new ProgressDialog(TopNewsActivity.this);
progressDialog.setCancelable(true);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setProgress(0);
progressDialog.show();
}
@Override
protected ArrayList<HashMap<String, String>> doInBackground(String... paths) {
ArrayList<HashMap<String, String>> mylist = new ArrayList<HashMap<String, String>>();
String xml = XMLfunctions.getTopNewsXML();
Document doc = XMLfunctions.XMLfromString(xml);
int numResults = XMLfunctions.numResults(doc);
Log.d(LOG_TAG, "Number of Results: " + numResults);
if ((numResults <= 0)) {
Toast.makeText(TopNewsActivity.this, "No Result Found",Toast.LENGTH_LONG).show();
finish();
}
NodeList nodes = doc.getElementsByTagName("result");
for (int i = 0; i < nodes.getLength(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nodes.item(i);
map.put("id", XMLfunctions.getValue(e, "id"));
map.put("title", XMLfunctions.getValue(e, "title"));
mylist.add(map);
}
return mylist;
}
@Override
protected void onProgressUpdate(Integer... values) {
super.onProgressUpdate(values);
}
protected void onPostExecute(ArrayList<HashMap<String, String>> result) {
ListAdapter adapter = new SimpleAdapter(TopNewsActivity.this, result, R.layout.list_item, new String[] { "title" }, new int[] { R.id.item_title });
setListAdapter(adapter);
progressDialog.dismiss();
final ListView lv = getListView();
lv.setTextFilterEnabled(true);
lv.setOnItemClickListener(new OnItemClickListener() {
@SuppressWarnings("unchecked")
@Override
public void onItemClick(AdapterView<?> a, View view, final int position, long id) {
HashMap<String, String> o = (HashMap<String, String>) lv.getItemAtPosition(position);
Intent i = new Intent(TopNewsActivity.this, NewsDetails.class);
i.putExtra("content_id", o.get("id"));
i.putExtra("title", o.get("title"));
i.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
View v = TopNewsGroup.group.getLocalActivityManager().startActivity("ShowNews", i).getDecorView();
// Again, replace the view
TopNewsGroup.group.setContentView(v);
}
});
}
}
public class MySimpleAdapter extends SimpleAdapter {
public MySimpleAdapter(Context context, List<? extends Map<String, ?>> data, int resource, String[] from, int[] to) {
super(context, data, resource, from, to);
// TODO Auto-generated constructor stub
}
}
}
请帮助！！！！
dialog = ProgressDialog.show(Example.this, "",
"Doing stuff. Please wait...", true);