从异步任务填充片段listview

Question

我需要从loadListTask填充listview。您将在脚本的末尾看到它应该发生的位置。怎么做呢?我尝试了几种方法，但总是相同的结果，崩溃。

这里的主活动和最后的异步任务:

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

你必须保持对listtitem和maListViewPerso的引用才能在onPostExecute中使用它们，你可以通过将它们声明为类的成员来做到这一点。

完成这些之后，您必须创建适配器。(adapter)对于简单的数据结构，你可以使用Android的预定义，如ArrayAdapter或SimpleCursorAdapter，但我认为你想做的是创建一个列表，通过数组列表迭代，然后进入映射的项目。为此，您必须实现您自己的适配器，扩展BaseAdapter。实现getView(int pos)你必须返回项目的位置pos和getCount() ListView将知道你的列表有多少项。