Question

我在android studio上使用firebase创建了一个应用程序。使用mobile otp进行身份验证后会出现一个搜索视图。当用户搜索搜索视图时，它将过滤结果并转到回收站视图，依此类推。在第一次启动活动（即，身份验证后的家庭活动）应用程序完美运行。

但我的问题是我的应用程序在一段时间后没有加载数据。其他字段包括searchview也没有用。此外，应用程序在注销后工作，并在发生此问题后再次登录应用程序。

有人知道如何解决它吗？

<div id="container">
  <input type="text" id="text">

  <div id="list">
    <div class="item"> item 1</div>
    <div class="item"> item 2</div>
    <div class="item"> item 3</div>
  </div>

</div>

}

Answer 1

您在onCreateView中撰写的所有代码均应使用onViewCreated编写。

最好将任何子视图分配给onViewCreated中的字段。这是因为框架会对您进行自动空检查，以确保您的Fragment的视图层次结构已被创建并膨胀。

public class FragmentHome extends Fragment {
    private SearchView search;
    View v;
    DatabaseReference dataRef;
    private  FirebaseListAdapter<String> firebaseListAdapter;
    ListView mListView;
    private TextView text;
    ArrayList<String> city=new ArrayList<String>();
    private int i=0;
    private String data,val,var;
    ArrayAdapter<String> adapter;
    ProgressBar progressBar;

    @Nullable
    @Override

    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable final Bundle savedInstanceState) {
        v = inflater.inflate(R.layout.activity_fragment_home,container,false);
        if (container!=null){
            container.removeAllViews();
        }
        return v;
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    progressBar= (ProgressBar) v.findViewById(R.id.search_pro);
    search= (SearchView) v.findViewById(R.id.search);
    search.onActionViewExpanded();
    search.setIconified(false);
    search.setInputType(InputType.TYPE_NULL);
    search.setQueryHint("Search Docter By City Or Department");
    mListView= (ListView) v.findViewById(R.id.mList);
    mListView.setVisibility(View.INVISIBLE);

dataRef=FirebaseDatabase.getInstance().getReference().child("Docters");
adapter=new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, city);
mListView.setAdapter(adapter);
adapter.notifyDataSetChanged();
dataRef.addChildEventListener(new ChildEventListener() {
    @Override
    public void onChildAdded(DataSnapshot dataSnapshot, String s) {
        data=dataSnapshot.child("city").getValue(String.class);
        val=dataSnapshot.child("department").getValue(String.class);
        if (!city.contains(data)){
            city.add(data);
        }
        if (!city.contains(val)){
            city.add(val);
        }
        search.setInputType(InputType.TYPE_CLASS_TEXT);
        progressBar.setVisibility(View.GONE);
        adapter.notifyDataSetChanged();

    }
    @Override
    public void onChildChanged(DataSnapshot dataSnapshot, String s) {
        data=dataSnapshot.child("city").getValue(String.class);
        val=dataSnapshot.child("department").getValue(String.class);
        city.add(data);
        city.add(val);
        city.add(var);
        adapter.notifyDataSetChanged();
    }

    @Override
    public void onChildRemoved(DataSnapshot dataSnapshot) {

    }

    @Override
    public void onChildMoved(DataSnapshot dataSnapshot, String s) {
    }

    @Override
    public void onCancelled(DatabaseError databaseError) {
    }
});
search.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
    @Override
    public boolean onQueryTextSubmit(String text) {

        return false;
    }

    @Override
    public boolean onQueryTextChange(String text) {
        if (!text.isEmpty()){
            adapter.notifyDataSetChanged();
        mListView.setVisibility(View.VISIBLE);
           adapter.getFilter().filter(text);
        }else{
            mListView.setVisibility(View.INVISIBLE);
        }
        return false;
    }

});

mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String itemRef = (String) adapter.getItem(position);
        search.setVisibility(View.INVISIBLE);
        mListView.setVisibility(View.INVISIBLE);
        FragmentTransaction ft=getChildFragmentManager().beginTransaction();
        DocterList fragment=new DocterList();
        Bundle item=new Bundle();
        item.putString("item",itemRef);
        fragment.setArguments(item);
        ft.replace(R.id.activity_fragment_home,fragment);
        ft.addToBackStack(null);
        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
        ft.commit();
    }
});
    }

progressBar= (ProgressBar) v.findViewById(R.id.search_pro); ==＆gt;视图只会在onViewCreated

中出现

数据未正确加载到firebase应用程序中

1 个答案: