Develop Reference

Android Spinner onItemSelected not being called inside Fragment

I have an activity which calls several fragments. In one of those fragments I am trying to create a dialog spinner programmatically and add it to the menu option (in toolbar). I manage to make it work (atleast the view is showing), but the onItemSelected it is not getting called.
My code:
public class NewsFeed extends Fragment {
private static final String TAG = "tag";
private String tag;
private ArrayAdapter<New> newsadapter;
private ArrayAdapter<Tag> tagsadapter;
private Spinner spinner;
public NewsFeed() {
setHasOptionsMenu(true);
}
public static NewsFeed newInstance(String tag) {
NewsFeed fragment = new NewsFeed();
Bundle args = new Bundle();
args.putString(TAG, tag);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
tag = getArguments().getString(TAG);
}
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
getActivity().setTitle(tag);
NavigationView activitynav = (NavigationView) getActivity().findViewById(R.id.nav_view);
BottomNavigationView activitybuttomnav = (BottomNavigationView) getActivity().findViewById(R.id.navigation);
activitynav.setCheckedItem(R.id.nav_news);
activitybuttomnav.getMenu().getItem(1).setChecked(true);
View v = inflater.inflate(R.layout.fragment_news_feed, container, false);
//Spinner related code
tagsadapter = new TagsAdapter(getActivity(), android.R.layout.simple_spinner_item, (ArrayList<Tag>) ApplicationData.tags);
spinner = new Spinner(getActivity(), Spinner.MODE_DIALOG);
tagsadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setPrompt("Filtrar por categoria:");
spinner.setAdapter(tagsadapter);
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
#Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
newsadapter = new NewsAdapter(getActivity().getApplicationContext(), 0, (ArrayList<New>) ApplicationData.news);
ListView listview = (ListView) v.findViewById(R.id.listview);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapter, View view, int position, long id) {
FragmentTransaction ft = getActivity().getSupportFragmentManager().beginTransaction();
NewsDisplay nd = NewsDisplay.newInstance(tag, ApplicationData.news.get(position).getNewsUrl());
ft.addToBackStack(null);
ft.replace(R.id.fragmentcontent, nd).commit();
}
});
listview.setAdapter(newsadapter);
return v;
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.main, menu);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.filter_category) {
//For showing the spinner
spinner.performClick();
return true;
}
return super.onOptionsItemSelected(item);
}
}
Already tried:
To make NewsFeed implementing OnItemSelectedListener.
To create the OnItemSelectedListener object inside SetOnItemSelectedListener.
Could you give me some help? It might have to do with this being a fragment and the toolbar is in the activity.

Spinner that was created dynamically (private val popupSpinner: Spinner by lazy { Spinner(this, Spinner.MODE_DIALOG) }), needs to have an assigned parent view. If it does not have it, the OnItemSelected is never called for some reason.
I wrote this hack to alleviate the problem. Added to parent view and hid it. Be sure not to run this in onResume() method and similar ones.
findViewById<ViewGroup>(android.R.id.content).addView(popupSpinner)
popupSpinner.visibility = View.INVISIBLE
PS. Some people might think that this question does not have an answer. But in the comments the author himself found a solution.

communicate from dialog fragment to fragment

I have two fragments:AllItemsFragment, CreateItemDialogFragment
The AllItemsFragment displays a list of items in the sqlite,CreateItemDialogFragment is used to create the item to the SQLite.
Now I have a question is after I creating a item in createItemDialogFragment,the dialog dismiss, how to update the display of the items in AllItemsFragment
In AllItemsFragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.d(LIFETAG, "onCreateView");
View view = inflater.inflate(R.layout.fragment_all_items, container, false);
ButterKnife.bind(this, view);
tvTitle.setText("All Items");
DbHandler dbHandler = new DbHandler(getActivity(),null,null,1);
ArrayList<Item> items = dbHandler.getAllItems();
AllItemsAdapter adapter = new AllItemsAdapter(getActivity(),items);
lvItems.setAdapter(adapter);
return view;
}
In CreateItemDialogFragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
getDialog().requestWindowFeature(Window.FEATURE_NO_TITLE);
View view =inflater.inflate(R.layout.fragment_create_item_dialog,null);
ButterKnife.bind(this, view);
itemPrice.setInputType(EditorInfo.TYPE_CLASS_NUMBER);
return view;
}
#OnClick(R.id.clear)
void clearDialog(){
dismiss();
}
//create item
#OnClick(R.id.save)
void saveItem() {
if(!itemName.getText().equals(null)||!itemPrice.getText().equals(null)){
String name = itemName.getText().toString();
String priceStr = itemPrice.getText().toString();
Double price = Double.parseDouble(priceStr);
Item item = new Item(name,price);
DbHandler dbHandler = new DbHandler(getActivity(),null,null,1);
dbHandler.addItems(item);
dismiss();
}
}

Try to update the data on onResume callback of the AllItemsFragment.
#Override
public void onResume(){
super.onResume();
// update data over here.
}

Cannot update views on left and right side of view pager

I have used viewpager which displays view with an image and radiobutton below. Each swipe screen is not a fragment, they are layouts which just swipe the same view with different imageview. The problem is that, I am unable to deselect the radio button which is in left and right side of the current view after i select the radio button of the current screen. If I return POSITION_NONE in getItemPosition(), it refresh the screen and radio button also deselected but the view is flickered. If i am able to call instantiateItem(), my problem is solved . But this method is called only when view is destroyed based on the setOffsetScreenPageLimit(). How can I achieved such requirements, if view pager cannot help?
Fragment:
public class AnswerImageDialogFragment extends DialogFragment implements ViewPager.OnPageChangeListener {
//member declaration
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
String strQuestion = null;
View rootView = inflater.inflate(R.layout.activity_viewpager_demo, container,
false);
getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
intro_images = (ViewPager) rootView.findViewById(R.id.pager_introduction);
pager_indicator = (LinearLayout) rootView.findViewById(R.id.viewPagerCountDots);
//do some stuff
//set the adapter
mAdapter = new ViewPagerAdapter(getContext(), map);
intro_images.setAdapter(mAdapter);
intro_images.setCurrentItem(clickPosition);
intro_images.setOnPageChangeListener(this);
setUiPageViewController();
bus = EventBus.getDefault();
bus.register(this);
return rootView;
}
//other method
}
PagerAdapter:
public class ViewPagerAdapter extends PagerAdapter {
// member declaration
public ViewPagerAdapter(Context mContext, HashMap<String, Object> map) {
//other initialization
}
#Override
public int getCount() {
return optionImages.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return view == ((LinearLayout) object);
}
#Override
public Object instantiateItem(ViewGroup container, final int position) {
View itemView = LayoutInflater.from(mContext).inflate(R.layout.pager_item, container, false);
final ImageView ivOption = (ImageView) itemView.findViewById(R.id.answerId); // this is used as radio button in this case
/*The code snippet is to select the answer option based on whether answer is choosen or not.
If choosen, select as default in the pop up answer.
*/
if (null != ans) {
Iterator iterator = ans.iterator();
if (ans.size() > 0) {
int value = (int) iterator.next();
if (value == position) {
ivOption.setImageResource(R.drawable.ic_radio_button_tick);
} else {
ivOption.setImageResource(R.drawable.ic_radio_button_nontick);
}
}
}
p = position;
/*The code snippet is to change the answer value based on the user selection.
This means if user choosen another answer then clear the earlier choosen answer
*/
ivOption.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//do stuff
}
});
txtQuestion.setText(question);
txtOption.setText(optionsList.get(position));
imageView.setParseFile(optionImages.get(position));
imageView.loadInBackground();
container.addView(itemView);
return itemView;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
LinearLayout ll = (LinearLayout) object;
/*RelativeLayout ivOption = (RelativeLayout) ll.getChildAt(2);
ImageView iv = (ImageView) ivOption.getChildAt(1);
iv.setImageResource(R.drawable.ic_radio_button_tick);*/
container.removeView(ll);
}
#Override
public int getItemPosition(Object object) {
return super.getItemPosition(object);
}
public void refresh(ArrayList object) {
this.object = new ArrayList();
this.object.addAll(object);
this.notifyDataSetChanged();
}

Cannot launch fragment: The specified child already has a parent

I am having the "child already has a parent" error close to what a lot of people have been getting, however, I am getting it doing something different (as far as my searches have shown me). I am assuming that the way I am adding the fragment is not necessarily wrong, but I cannot for the life of me figure out how the fragment I am adding already has a parent.
I am launching from my main activity using a fragment to be loaded into a FrameLayout. Here is the onCreate from my main activity:
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
realm = Realm.getDefaultInstance();
if (savedInstanceState == null) {
}
tripsFragment = new CarTripsOverview();
getSupportFragmentManager().beginTransaction().add(R.id.content_container, tripsFragment).commit();
}
And here are the methods which run for CarTripsOverview (which is a Fragment):
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
}
setUpRealm();
}
void setUpRealm() {
realm = Realm.getDefaultInstance();
RealmQuery<Car> carQuery = realm.where(Car.class);
RealmResults<Car> carResults = carQuery.findAll();
carAdapter = new CarArrayAdapter(getActivity(),0, carResults, true);
RealmQuery<Trip> tripQuery = realm.where(Trip.class);
RealmResults<Trip> tripResults = tripQuery.findAll();
tripAdapter = new TripAdapterRealm(getActivity(), 0, tripResults, true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_car_trips_overview, container, true);
// Bind all of the views with Butter Knife
ButterKnife.bind(this, view);
setUpSwipeMenu();
// Add my event listeners
tripListView.setAdapter(tripAdapter);
carSpinner.setAdapter(carAdapter);
return view;
}
void setUpSwipeMenu() {
SwipeMenuCreator creator = new SwipeMenuCreator() {
#Override
public void create(SwipeMenu menu) {
SwipeMenuItem deleteItem = new SwipeMenuItem(getContext());
deleteItem.setBackground(new ColorDrawable(Color.RED));
deleteItem.setWidth(MathHelper.dipToPixels(getContext(), 90));
deleteItem.setTitle("Delete");
deleteItem.setTitleColor(Color.WHITE);
deleteItem.setTitleSize(18);
menu.addMenuItem(deleteItem);
}
};
tripListView.setMenuCreator(creator);
tripListView.setOnMenuItemClickListener(new SwipeMenuListView.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(int position, SwipeMenu menu, int index) {
Trip trip = tripAdapter.getItem(position);
switch (index) {
case 0:
delete(trip);
tripAdapter.notifyDataSetChanged();
break;
}
return false;
}
});
}
My biggest problem is that I just don't understand quite where I am adding the child to the parent where it would already have a parent.
All of my source code can be found here.

Instead of:
View view = inflater.inflate(R.layout.fragment_car_trips_overview, container, true);
use:
View view = inflater.inflate(R.layout.fragment_car_trips_overview, container, false);
Notice the last parameter is false now. If you use true, the view you just created will be automatically added to the container (second parameter of inflate). With fragments, always use false in onCreateView(...).

How to avoid fragment's list refreshing after Navigation Drawer opens?

I have list in my fragment and NavigationDrawer in MainActivity. From NavigationDrawer I'm calling that fragment. When I have scrolled a little bit and opened NavigationDrawer again, list refreshes and starts from the top. I guess the main reason is setHasOptionsMenu(true); because when I comment this line everything is okay, but my Search in ActionBar doesn't work.
When I have scrolled a little bit:
What it should look like:
What it's actually looks:
My fragment:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.alllists, container, false);
View header = inflater.inflate(R.layout.list_header, null);
ImageView image = (ImageView) header.findViewById(R.id.small_icon);
navMenuIcons = getResources().obtainTypedArray(R.array.nav_drawer_icons);
Bundle bundle = getArguments();
position = bundle.getInt("position");
location = bundle.getString("location");
image.setImageDrawable(navMenuIcons.getDrawable(position));
context = getActivity().getApplicationContext();
DatabaseHandler db = new DatabaseHandler(context);
items = db.getAllItems(location);
tmp_items = db.getAllItems(location);
listView = (ListView) rootView.findViewById(R.id.list);
adapter = new CustomListAdapter(context, items);
listView.addHeaderView(header, "", false);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
});
setHasOptionsMenu(true);
return rootView;
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
MenuItem searchItem = menu.findItem(R.id.action_search);
mSearchView = (SearchView) MenuItemCompat.getActionView(searchItem);
mSearchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String s) {
return false;
}
#Override
public boolean onQueryTextChange(String s) {
if (TextUtils.isEmpty(s)) {
adapter = new CustomListAdapter(context, tmp_items);
listView.setAdapter(adapter);
}
if (tmp_s.length() > s.length()) {
adapter.getFilter(tmp_items, true).filter(s);
} else {
adapter.getFilter(tmp_items, false).filter(s);
}
tmp_s = s;
return false;
}
});
}
#Override
public void onPrepareOptionsMenu(Menu menu) {
super.onPrepareOptionsMenu(menu);
mSearchView.setQuery("", false);
}
I have updated my newInstance method:
public static final AllLists newInstance(int position, String location) {
AllLists mainfrag = MainActivity.getMainFragment();
if (mainfrag == null || !mainfrag.getArguments().getString("location").equals(location)) {
AllLists all = new AllLists();
Bundle bdl = new Bundle(2);
bdl.putInt("position", position);
bdl.putString("location", location);
all.setArguments(bdl);
MainActivity.setMainFragment(all);
return all;
}
return mainfrag;
}
MainActivity:
public static AllLists mainFragment = null;
...
public static void setMainFragment(AllLists fragment) {
mainFragment = fragment;
}
public static AllLists getMainFragment() {
return mainFragment;
}
Just to be clear, I change my fragments like this:
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.frame_container, AllLists.newInstance(position, location))
.commit();

The problem is that your Fragment View will get reset each time you return to it.
To not to loose state of your main fragment, you should do "new Fragment()" only once in your newIntance method. You can make a global variable, say 'mainFragment', storing once created new Fragment(), and then apply a check that if your global variable, i.e. 'mainFragment', is not null, then return mainFragment.
This should fix your problem. But on screen rotations, a new instance will still be created, leading to again taking you back to top of your list. For the rotation problem, see :
http://blog.sqisland.com/2014/06/navigationdrawer-creates-fragment-twice.html

from the docs,
Your fragments can contribute menu items to the activity's Options
Menu (and, consequently, the Action Bar) by implementing
onCreateOptionsMenu(). In order for this method to receive calls,
however, you must call setHasOptionsMenu() during onCreate(), to
indicate that the fragment would like to add items to the Options Menu
(otherwise, the fragment will not receive a call to
onCreateOptionsMenu()).
so, lets move move the setHasOptionsMenu(true); from your onCreateView(...) call to the onCreate(...) override in your fragment:
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}