ListView不填充

Question

我遇到了无法解决的问题。我有FragmentA和FragmentB。当我第一次交易到FragmentB ListView没有填充。如果我按“返回”并再次执行交易，那么ListView正在填充。 我的代码有什么问题？

这是我的片段代码：

public class RegionListFrag extends android.support.v4.app.Fragment { 

    ArrayList<String> names = new ArrayList<>(); 
     RegionAddAdapter regionAddAdapter; 
    ListView listView; 
    DBHelper dbHelper; 
    SQLiteDatabase db; 
    final String LOG_TAG = "myLogs"; 
    RegionNameClass regionNameClass; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setHasOptionsMenu(true); 
     ((MainActivity)getActivity()).changeTbOn(); 
     MainActivity.toolbar.setTitle("Regions"); 
    } 

    @Override 
    public View onCreateView(LayoutInflater inflater, ViewGroup container, 
          Bundle savedInstanceState) { 
     View rootView = inflater.inflate(R.layout.region_layout, container, false); 
     MainActivity.toolbar.setTitle("Regions"); 
     listView = (ListView) rootView.findViewById(R.id.region_lv); 

     regionAddAdapter = new RegionAddAdapter(getActivity(), 
       setRv()); 
     listView.setAdapter(regionAddAdapter); 
     listView.setPadding(0, 110, 0, 0); 

     return rootView; 
    } 

    @Override 
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) { 
     inflater.inflate(R.menu.menu_toolbar, menu); 
     super.onCreateOptionsMenu(menu,inflater); 
     Menu myMenu = menu; 
     MenuItem nextItem = myMenu.findItem(R.id.accept_category); 
     nextItem.setVisible(true); 

    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     if (item.getItemId() == android.R.id.home) { 

      getFragmentManager().popBackStack(); 
      getFragmentManager().beginTransaction().commit(); 
      return true; 
     } 

     if (item.getItemId() == R.id.accept_category) { 

     } 

     return super.onOptionsItemSelected(item); 
    } 

    ArrayList<RegionNameClass> setRv(){ 
     dbHelper = new DBHelper(getActivity()); 
     db = dbHelper.getWritableDatabase(); 

     Cursor c = db.query("regiontable", null, null, null, null, null, 
       null); 
     ArrayList<RegionNameClass> rvArray = new ArrayList<RegionNameClass>(); 
     while(c.moveToNext()){ 
      String name = c.getString(c.getColumnIndex("regNames")); 
      RegionNameClass regionObj = new RegionNameClass(name); 
      rvArray.add(regionObj); 
     } 
     Log.d(LOG_TAG, "array size - " + rvArray.size()); 
     return rvArray; 
    } 
} 

这里是我的适配器：

public class RegionAddAdapter extends ArrayAdapter<RegionNameClass> { 

    private static ArrayList<RegionNameClass> list = new ArrayList<RegionNameClass>(); 
    private final Activity context; 
    public ArrayList<RegionNameClass> selectedStrings = new ArrayList<RegionNameClass>(); 
    final String LOG_TAG = "myLogs"; 
    RegionNameClass regionNameClass; 

    public RegionAddAdapter(Activity context, ArrayList<RegionNameClass> top) { 
     super(context, R.layout.region_row, list); 
     this.context = context; 
     list = top; 
    } 

    static class ViewHolder { 

     protected TextView myTv; 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 
     View view = null; 

     RegionNameClass myClass = getItem(position); 

     if (convertView == null) { 
      convertView = LayoutInflater.from(getContext()).inflate(R.layout.region_row, parent, false); 
     } 
     TextView tvName = (TextView) convertView.findViewById(R.id.region_tv); 
     tvName.setText(myClass.name); 
     return convertView; 
    } 
} 

Answer 1

请RegionAddAdapter检查，更新如下

public RegionAddAdapter(Activity context, ArrayList<RegionNameClass> top) { 
     super(context, R.layout.region_row, top); 
     this.context = context; 
     list = top; 
}