Android Parse Local Datastore返回Empty

Question

I have been working on an application where you input childs names and ages, and specific data is shown according to there input. I store the child info inside a local datastore.

Take a look at this simple class made for simple storage: `public class

 ChildInfo { public String name; public String gradeLevel; public int gradeLevelInt; public ChildInfo() { } public ChildInfo(String _name, String _gradeLevel, int _gradeLevelInt) { gradeLevel = _gradeLevel; name = _name; } } 

Inside my main fragment I have a list of ChildInfo Classes named children .

I call them like so:

 ParseQuery query = new ParseQuery("Child"); query.fromLocalDatastore(); query.findInBackground(new FindCallback<ParseObject>() { @Override public void done(List<ParseObject> objects, ParseException e) { if (e == null) { children.clear(); //Clear it out before we regen every person! for (int i = 0; i < objects.size(); i++) { ChildInfo child = new ChildInfo(); child.name = objects.get(i).getString("Name"); child.gradeLevel = objects.get(i).getString("GradeLevel"); child.gradeLevelInt = objects.get(i).getInt("GradeLevelInt"); children.add(child); } for (int i = pagerAdapter.getCount() - 1; i > 0; i--){ pagerAdapter.removeView(pager, i); } //Removes all pages. } else { Log.e("HomeScreen", e.toString()); } } }); 

The Question

This code WORKS, half the time . When I execute the query in the onViewCreated method it will return nothing. object.size is zero, but when called in the onResume method after I enter another page and exit back to this fragment it WILL work. Any ideas? I think this might be a bug with the parse API.

Answer 1

Alright. I found the fix! For some reason the children list lost everything added to it once it left the done method. I re arranged the code and this is the new Parse.com Query

 ParseQuery query = new ParseQuery("Child"); query.fromLocalDatastore(); query.findInBackground(new FindCallback<ParseObject>() { @Override public void done(List<ParseObject> objects, ParseException e) { if (e == null) { removeAllViews(pager); children.clear(); //Clear it out before we regen every person! for (int i = 0; i < objects.size(); i++) { ChildInfo child = new ChildInfo(); child.name = objects.get(i).getString("Name"); child.gradeLevel = objects.get(i).getString("GradeLevel"); child.gradeLevelInt = objects.get(i).getInt("GradeLevelInt"); children.add(child); } Log.i("HomePagerAdapter", "Children Size: " + children.size() + "\\n Obj Size: " + objects.size()); for (int i = 0; i < children.size(); i++) { addChild(pager, children.get(i).name, children.get(i).gradeLevelInt); } } else { Log.e("HomePagerAdapter", e.toString()); } } });