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我有一個片段activity.I實現了它的searchview，它的項目從Firebase加載列表listview.It它工作時，我等待一段時間並加載數據。但，當我在負載發生之前立即點擊searchview時，它甚至在很長時間之後都沒有加載任何數據。然後，當我回到主片段並再次返回時立即使負載數據。我認爲這是一個小問題。但，我在Android的初學者development.so這是非常困難的我。我的代碼是帶有列表視圖的Searchview無法正常工作
public class FragmentHome extends Fragment {
private SearchView search;
View view;
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;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable final Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.activity_fragment_home,container,false);
if (container!=null){
container.removeAllViews();
}
search= (SearchView) v.findViewById(R.id.search);
search.onActionViewExpanded();
search.setIconified(false);
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);
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);
}
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()){
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();
}
});
return v;
}}
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