從異步任務填充片段列表視圖

Question

我需要從loadListTask填充listview。你會在腳本結尾看到它應該發生的地方。怎麼做 ？ 我嘗試了幾種方法，但總是碰到同樣的結果。

主要在這裏活動，並在年底的異步任務：

public class MainActivity extends FragmentActivity { 
SectionsPagerAdapter mSectionsPagerAdapter; 
ViewPager mViewPager; 


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

    LoadListTask myLoadListTask = new LoadListTask(); 
    myLoadListTask.execute(); 


    mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager()); 
    mViewPager = (ViewPager) findViewById(R.id.pager); 
    mViewPager.setAdapter(mSectionsPagerAdapter); 
} 

@Override 
public boolean onCreateOptionsMenu(Menu menu) { 
    // Inflate the menu; this adds items to the action bar if it is present. 
    getMenuInflater().inflate(R.menu.activity_main, menu); 
    return true; 
} 

public class SectionsPagerAdapter extends FragmentPagerAdapter { 

    public SectionsPagerAdapter(FragmentManager fm) { 
     super(fm); 
    } 

    @Override 
    public Fragment getItem(int position) { 
     Fragment fragment = new SectionFragment(); 
     Bundle args = new Bundle(); 
     args.putInt(SectionFragment.ARG_SECTION_NUMBER, position + 1); 
     fragment.setArguments(args); 
     return fragment; 
    } 

    @Override 
    public int getCount() { 
     return 3; 
    } 

    @Override 
    public CharSequence getPageTitle(int position) { 
     switch (position) { 
     case 0: 
      return getString(R.string.title_section1).toUpperCase(); 
     case 1: 
      return getString(R.string.title_section2).toUpperCase(); 
     case 2: 
      return getString(R.string.title_section3).toUpperCase(); 
     } 
     return null; 
    } 
} 

public static class SectionFragment extends Fragment { 
    /** 
    * The fragment argument representing the section number for this 
    * fragment. 
    */ 
    public static final String ARG_SECTION_NUMBER = "section_number"; 

    public SectionFragment() { 
    } 

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

     ArrayList<HashMap<String, String>> listItem; 
     HashMap<String, String> map; 
     SimpleAdapter mSchedule; 
     listItem = new ArrayList<HashMap<String, String>>(); 
     map = new HashMap<String, String>(); 
     ListView maListViewPerso = new ListView(getActivity()); 

     mSchedule = new SimpleAdapter (getActivity(), listItem, R.layout.affichageitem, 
       new String[] {"img", "titre", "description"}, new int[] {R.id.img, R.id.titre, R.id.description}); 
     maListViewPerso.setAdapter(mSchedule); 




     switch (getArguments().getInt(
       ARG_SECTION_NUMBER)) { 
     case 1: 

      map = new HashMap<String, String>(); 
      map.put("titre", "Excel"); 
      map.put("description", Integer.toString(getArguments().getInt(
        ARG_SECTION_NUMBER))); 
      map.put("img", String.valueOf(R.drawable.devoir)); 
      listItem.add(map); 

     case 2: 
      //To do 
     case 3: 
      //To do 
     } 

     return maListViewPerso; 
    } 
} 


// I NEED TO POPULATE FROM HERE 
private class LoadListTask extends AsyncTask<String, Void, Integer> { 
    protected void onPreExecute() { 
    } 

    protected Integer doInBackground(String... params) { 
     return 0; 
    } 

    protected void onPostExecute(Integer result) { 
     if (result == 0) { 
     } 
    } 
} 
} 

Answer 1

你必須參考保持到的listItem和maListViewPerso在onPostExecute使用它們，您可以通過聲明爲成員做你類。

這樣做後，你必須創建你的適配器。 (adapter)對於簡單的數據結構，您可以使用Android的預定義之一，例如ArrayAdapter或SimpleCursorAdapter，但我想你要做的是創建一個列表，它遍歷ArrayList，然後進入地圖的項目。要做到這一點，你必須實現自己的適配器，擴展BaseAdapter。實施getView(int pos)你必須返回位置pos和getCount()的項目ListView會知道你的列表有多少項目。