progression dialogue maître-détail ne pas afficher android

Question

J'ai une asynctask qui accède aux données d'un serveur et remplit un flux principal-détail. Remplir la liste sur le côté gauche. Je peux voir le dialogue de progression fonctionner correctement. Lorsque je sélectionne cet élément, j'appelle une autre tâche asynchrone pour obtenir plus d'informations pour ce côté. Lorsque je sélectionne l'élément de la liste sur le côté gauche, la boîte de dialogue de progression n'apparaît pas. Il apparaît pendant une fraction de seconde, puis les données sont affichées.

Comment puis-je créer une boîte de dialogue de progression qui s'affiche pendant la durée de la seconde tâche asynchrone qui obtient des données pour le fragment de la main droite?

gauche élément de la liste à la main:

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; 
    } 
} 

fragment droit détails à la main:

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; 
    } 
} 

Y at-il une raison particulière pour expliquer pourquoi ma boîte de dialogue de progression n'apparaît pas sur certains des l'article de la liste ??? Où vais-je mal dans mon code ??

Answer 1

vous ne pouvez pas getActivity() à partir AsyncTask, vous devez passer dans le constructeur:

premier constructeur ajouter

public ConnectToServer(Activity activity) { 
    super(); 
    this.activity = activity; 
} 

puis utilisez l'activité dans votre dialogue

PD = ProgressDialog.show(activity,"title","massage", true); 
PD.setCancelable(true); 
PD.show();