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我有一个asynctask，它从服务器访问数据并填充主 - 细节流。填充左侧的列表。我可以看到进度对话框正常工作。当我选择该项目时，然后我会调用另一个异步任务以获取该方面的更多信息。当我从左侧列表中选择项目时，进度对话框不显示。它像一瞬间弹出，然后显示数据。进度对话框master-detail不显示android
如何创建一个进度对话框，显示第二个asynctask获取右手片段数据的持续时间？
左侧列表中的项目：
public class ItemListFragment extends ListFragment
{
private ObjectOutputStream output;
private ObjectInputStream input;
private String message = "";
private Socket client;
private XMLCreator x = new XMLCreator();
private static final String STATE_ACTIVATED_POSITION = "activated_position";
private Callbacks mCallbacks = sDummyCallbacks;
private int mActivatedPosition = ListView.INVALID_POSITION;
public interface Callbacks
{
public void onItemSelected(int id, String value);
}
private static Callbacks sDummyCallbacks = new Callbacks()
{
@Override
public void onItemSelected(int id, String value)
{
}
};
public class ConnectToServer extends AsyncTask<Integer, String, ArrayList<String>>
{
ProgressDialog PD;
@Override
protected void onPreExecute()
{
//Works fine and shows up perfectly
super.onPreExecute();
PD = new ProgressDialog(ItemListFragment.this.getActivity());
PD.setTitle("Please Wait..");
PD.setMessage("Loading...");
PD.setCancelable(true);
PD.setIndeterminate(true);
PD.show();
}
@Override
protected ArrayList<String> doInBackground(Integer... params)
{
Socket client;
DataInputStream input;
DataOutputStream output;
String serverResult = "nothing";
XMLCreator x = new XMLCreator();
ArrayList<String> lists = new ArrayList<String>();;
try
{
Log.i("CLIENT", "Client started");
// Step 1: Create a Socket to make connection.
// client = new Socket(InetAddress.getLocalHost(), 500);
client = new Socket("10.0.0.5", 5001);
Log.i("CLIENT", "Connected to: "
+ client.getInetAddress().getHostName());
publishProgress("Connecting to server...");
// Step 2: Get the input and output streams.
input = new DataInputStream(client.getInputStream());
output = new DataOutputStream(client.getOutputStream());
output.flush();
Log.i("CLIENT", "Got I/O Streams");
publishProgress("Obtained Streams...");
// Step 3: Process connection.
// Step 4: Close connection.
Log.i("CLIENT", "Transmission complete. "
+ "Closing connection.");
output.writeUTF("TERMINATE");
client.close();
publishProgress("Closed connection...");
} catch (IOException e) {
e.printStackTrace();
String s = e.getMessage();
String b = s;
}
return lists;
}
@Override
protected void onPostExecute(ArrayList<String> lists)
{
super.onPostExecute(lists);
PD.dismiss();
List<DummyItem> ITEMS = new ArrayList<DummyItem>();
for (String s : lists)
{
int count = 1;
ITEMS.add(new DummyItem("",s));
}
setListAdapter(new ArrayAdapter<DummyContent.DummyItem>(getActivity(),
android.R.layout.simple_list_item_activated_1, android.R.id.text1, ITEMS));
}
@Override
protected void onProgressUpdate(String... values)
{
PD.setMessage(values[0]);
super.onProgressUpdate(values);
}
}
public ItemListFragment()
{
}
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
ConnectToServer task = new ConnectToServer();
task.execute();
}
@Override
public void onViewCreated(View view, Bundle savedInstanceState)
{
super.onViewCreated(view, savedInstanceState);
// Restore the previously serialized activated item position.
if (savedInstanceState != null && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
setActivatedPosition(savedInstanceState.getInt(STATE_ACTIVATED_POSITION));
}
}
@Override
public void onAttach(Activity activity)
{
super.onAttach(activity);
// Activities containing this fragment must implement its callbacks.
if (!(activity instanceof Callbacks))
{
throw new IllegalStateException("Activity must implement fragment's callbacks.");
}
mCallbacks = (Callbacks) activity;
}
@Override
public void onDetach() {
super.onDetach();
// Reset the active callbacks interface to the dummy implementation.
mCallbacks = sDummyCallbacks;
}
@Override
public void onListItemClick(ListView listView, View view, int position, long id)
{
super.onListItemClick(listView, view, position, id);
Object item = listView.getItemAtPosition(position);
String myitem = item.toString();
mCallbacks.onItemSelected(position, myitem);
}
@Override
public void onSaveInstanceState(Bundle outState)
{
super.onSaveInstanceState(outState);
if (mActivatedPosition != ListView.INVALID_POSITION)
{
outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
}
}
public void setActivateOnItemClick(boolean activateOnItemClick)
{
getListView().setChoiceMode(activateOnItemClick ? ListView.CHOICE_MODE_SINGLE : ListView.CHOICE_MODE_NONE);
}
private void setActivatedPosition(int position)
{
if (position == ListView.INVALID_POSITION)
{
getListView().setItemChecked(mActivatedPosition, false);
} else
{
getListView().setItemChecked(position, true);
}
mActivatedPosition = position;
}
}
右手细节片段：
public class CountingFragment extends Fragment
{
int mNum;
String value;
List<Session> lists;
String[] simpleArray;
public class ConnectToServer extends AsyncTask<String, String, List<Session>>
{
ProgressDialog PD;
@Override
protected void onPreExecute()
{
//Doesn't show up at all ---> Want to show the dialog here
PD = new ProgressDialog(getActivity());
PD.setTitle("Please Wait..");
PD.setMessage("Loading...");
PD.setCancelable(true);
PD.setIndeterminate(true);
PD.show();
super.onPreExecute();
}
@Override
protected List<Session> doInBackground(String... params)
{
Socket client;
DataInputStream input;
DataOutputStream output;
String results = "";
XMLCreator x = new XMLCreator();
List<Session> items = new ArrayList<Session>();
try
{
Log.i("CLIENT", "Client started");
// Step 1: Create a Socket to make connection.
// client = new Socket(InetAddress.getLocalHost(), 500);
client = new Socket("10.0.0.5", 5001);
Log.i("CLIENT", "Connected to: "
+ client.getInetAddress().getHostName());
publishProgress("Connected...");
// Step 2: Get the input and output streams.
input = new DataInputStream(client.getInputStream());
output = new DataOutputStream(client.getOutputStream());
Log.i("CLIENT", "Got I/O Streams");
publishProgress("Obtained Streams...");
// Step 3: Process connection.
//Read in the value that the user selected from the bundle
String Day = params[0].toString();
// Step 4: Close connection.
Log.i("CLIENT", "Transmission complete. "
+ "Closing connection.");
output.writeUTF("TERMINATE");
client.close();
publishProgress("Closed connection...");
} catch (IOException e) {
e.printStackTrace();
}
return items;
}
@Override
protected void onPostExecute(List<Session> lists)
{
super.onPostExecute(lists);
PD.dismiss();
}
@Override
protected void onProgressUpdate(String... values)
{
PD.setMessage(values[0]);
super.onProgressUpdate(values);
}
}
/**
* Create a new instance of CountingFragment, providing "num" as an argument.
*/
static CountingFragment newInstance(int num, String value)
{
CountingFragment f = new CountingFragment();
// Supply num input as an argument.
Bundle args = new Bundle();
args.putInt("num", num);
args.putString("value", value);
f.setArguments(args);
return f;
}
/**
* When creating, retrieve this instance's number from its arguments.
*/
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
value = getArguments() != null ? getArguments().getString("value") : "";
ConnectToServer task = new ConnectToServer();
try
{
lists = task.execute(value).get();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* The Fragment's UI is just a simple text view showing its instance number.
*/
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main_world, container, false);
ListView lv = (ListView) view.findViewById(R.id.list_sessions);
final SessionAdapter adapter = new SessionAdapter(getActivity(), lists);
lv.setAdapter(adapter);
//ArrayAdapter<String> adapter = new ArrayAdapter<String>(
// inflater.getContext(), android.R.layout.simple_list_item_1,
// lists);
return view;
}
}
有什么特别的原因，为什么我的进度对话框不显示在选择的了列表项???我的代码在哪里出错？
典型
然后使用活动原因是你没有在UIThread上这么做，因此它不会发生，或者代码在doInBackground（）内执行得太快而没有显示可视助手。 –