Android：adapter notifydatasetchanged does not work

Question

我有我的ListView的一些問題。刷新不起作用。有人能幫我嗎？ 我得到了一些片段，在每一個這些是一個列表視圖。通過點擊一個listitem，你可以輸入一個值。我刷新適配器的數據集，但列表不刷新。

下面的代碼：

public class ValuationActivity extends FragmentActivity { 

    SectionsPagerAdapter mSectionsPagerAdapter; 

    ViewPager mViewPager; 

    private static List<Ziel> goals = new ArrayList<Ziel>(); 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_valuation); 

     mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 

     mViewPager = (ViewPager) findViewById(R.id.pager); 
     mViewPager.setAdapter(mSectionsPagerAdapter); 

     this.setTitle(ProjectsActivity.selectedProject.getKurzname()); 

     this.getGoals(); 

     mSectionsPagerAdapter.notifyDataSetChanged(); 

     } 
} 

public static class DummySectionFragment extends Fragment { 

    private static TextView pointsTextView; 
    private static ProgressBar progressBar; 
    private static Ziel selectedGoal; 
    private static List<Ziel> tempGoalList; 
    private SimpleAdapter sAdapter; 
    private static ArrayList<HashMap<String, String>> dataList; 
    private static String[] from; 
    private static int[] to; 
    private static int nativeLayout; 
    private static ListView listView; 

    public DummySectionFragment() { 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 

     View rootView = inflater.inflate(R.layout.fragment_valuation_dummy, container, false); 

     tempGoalList = (ValuationActivity.goals.get((getArguments().getInt(ARG_SECTION_NUMBER)) - 1)).getSubgoals(); 

     dataList = new ArrayList<HashMap<String, String>>(tempGoalList.size()); 


     this.refreshGoalList(rootView); 

     progressBar = (ProgressBar) rootView.findViewById(R.id.progressBarValuation); 
     pointsTextView = (TextView) rootView.findViewById(R.id.textViewPointsLeft); 

     progressBar.setProgress(points); 
     pointsTextView.setText(points.toString() + getString(R.string.StringPointsLeft)); 

     return rootView; 
    } 

    private void refreshGoalList(View rootView) { 

     tempGoalList = (ValuationActivity.goals.get((getArguments().getInt(ARG_SECTION_NUMBER)) - 1)).getSubgoals(); 

     listView = (ListView) rootView.findViewById(id.listViewSubgoals); 

     refreshData(); 

     from = new String[] { "name", "gewichtung" }; 
     to = new int[] { android.R.id.text1, android.R.id.text2 }; 
     nativeLayout = android.R.layout.simple_list_item_2; 
     sAdapter = new SimpleAdapter(getActivity(), dataList, nativeLayout, from, to); 

     listView.setAdapter(sAdapter); 

     listView.setOnItemClickListener(new OnItemClickListener() { 

      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { 

       tempGoalList = (ValuationActivity.goals.get((getArguments().getInt(ARG_SECTION_NUMBER)) - 1)).getSubgoals(); 

       AlertDialog.Builder valuationBox = new AlertDialog.Builder(getActivity()); 
       selectedGoal = tempGoalList.get(arg2); 

       valuationBox.setTitle(selectedGoal.getName() + ": " + selectedGoal.getBeschreibung()); 
       valuationBox.setMessage("Bitte geben Sie Ihre Bewertung ein. Sie haben noch " + points + " Punkte zur Verfügung."); 

       // Set an EditText view to get user input 
       final EditText input = new EditText(getActivity()); 
       input.setInputType(InputType.TYPE_CLASS_NUMBER); 

       valuationBox.setView(input); 

       valuationBox.setPositiveButton("Bewerten", new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, int whichButton) { 
         try { 
          Integer value = Integer.parseInt(input.getText().toString()); 
          System.out.println("Eingegangene Bewertung: " + value); 

          points = points + selectedGoal.getGewichtung() - value; 

          selectedGoal.setGewichtung(value); 

          progressBar.setProgress(points); 
          pointsTextView.setText(points.toString() + getString(R.string.StringPointsLeft)); 


         } catch (NumberFormatException nfe) { 
          System.out.println("Could not parse " + nfe); 
         } 
         // TODO - refresh GoalList 
         DummySectionFragment.refreshData(); 

         sAdapter.notifyDataSetChanged(); 
        } 

       }); 

       valuationBox.create().show(); 
      } 
     }); 
    } 

    private static void refreshData() { 

     dataList.clear(); 
     for (Ziel tempZiel : tempGoalList) { 

      HashMap<String, String> item = new HashMap<String, String>(); 
      item.put("name", tempZiel.getBeschreibung()); 
      item.put("gewichtung", tempZiel.getGewichtung().toString() + " Punkte"); 

      System.out.println(tempZiel.getBeschreibung() + ": " + tempZiel.getGewichtung()); 

      dataList.add(item); 
     } 



    } 
} 

Answer 1

你的問題是，你使用的是專爲靜態內容的SimpleAdapter。 所以你應該實現你自己的ListAdapter。

請參見：

http://developer.android.com/reference/android/widget/SimpleAdapter.html http://developer.android.com/reference/android/widget/ListAdapter.html

How to update SimpleAdapter in Android