Develop Reference

Autocomplete Text is not working in android fragment

I want to set autocomplete text in my application. The suggestion values will fetch from the database. But for a trial I made a string array for the suggestion values. It works fine when I implement it on an activity but not working in fragment.
In place of getActivity function I tried:
1) getContext()
2) this.getActivity()
3) (Search_Bus)getActivity()
but none work...
it's giving me error:
Attempt to invoke virtual method on a null object reference
Here's my code...
public class Bus_Schedule_tab3 extends Fragment {
AutoCompleteTextView autoCompleteTextView;
ArrayList<String> array;
ArrayAdapter<String> adapter;
String[] stop_names;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.bus_schedule_tab3, container, false);
stop_names = new String[] {"usa","china","russia","bangladesh"};
autoCompleteTextView = (AutoCompleteTextView)rootView.findViewById(R.id.autoCompleteTextView2);
adapter = new ArrayAdapter<String>(getActivity(),R.layout.support_simple_spinner_dropdown_item,stop_names);
autoCompleteTextView.setAdapter(adapter);
return rootView;
}

Its working for me...You missed to set threshold
AutoCompleteTextView autoCompleteTextView;
ArrayAdapter<String> adapter;
String[] stop_names;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_test, container, false);
stop_names = new String[]{"usa", "china", "russia", "bangladesh"};
autoCompleteTextView = rootView.findViewById(R.id.autoCompleteTextView2);
adapter = new ArrayAdapter<>(getActivity(), R.layout.support_simple_spinner_dropdown_item, stop_names);
autoCompleteTextView.setThreshold(1);
autoCompleteTextView.setAdapter(adapter);
return rootView;
}

Set in your xml file android:completionThreshold.
<AutoCompleteTextView
android:id="#+id/id"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
android:layout_weight="1"/>

Display GridView inside android fragment

CustomGrid is my GridView adapter and MainGrid is the fragment in which I want to display the GridView. I've done this but it is not working. What should I do?
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.main_xml, container, false);
CustomGrid adapter = new CustomGrid(MainGrid.this, web, imageId);
GridView grid = (GridView) view.findViewById(R.id.grid);
grid.setAdapter(adapter);
toolbar = (Toolbar)view.findViewById(R.id.fab_toolbar);
setupToolbar();
return view;
}

What you are doing wrong is, you are sending the context of fragment to adapter which is wrong. Try this
Activity act;
In onCreateView
act = getActivity();
And then
CustomGrid adapter = new CustomGrid(act, web, imageId);
Hope this helps

basic List View - Find by ID not working

i am trying to get a list view working in android studio.
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
populateListView();
return inflater.inflate(R.layout.stand1,container,false);
}
private void populateListView() {
String[] pair = {"Pair1","Pair2","Pair3","Pair4","Pair5"};
//build adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.stand1,pair);
//populate
ListView list = (ListView) findViewById(R.id.Stand1list);
list.setAdapter(adapter);
}}
The errors i am getting are
Error:(31, 40) error: no suitable constructor found for ArrayAdapter(Stand1,int,String[])
constructor ArrayAdapter.ArrayAdapter(Context,int,int) is not applicable
(argument mismatch; Stand1 cannot be converted to Context)
constructor ArrayAdapter.ArrayAdapter(Context,int,String[]) is not applicable
(argument mismatch; Stand1 cannot be converted to Context)
constructor ArrayAdapter.ArrayAdapter(Context,int,List<String>) is not applicable
(argument mismatch; Stand1 cannot be converted to Context)
Error:(34, 36) error: cannot find symbol method findViewById(int)
stand1 is an xml file, Stand1List is the listview id inside the stand1.xml
I know its something simple , but for the life of me i dont know what...
For references Stand1.java is java file which is a fragment inside the activity_main. It is being called by a nav drawer.
Update:
Thanks to Jedil Answer, i have it kinda working. However i have gotten an error when i load the fragment saying text view needs an ID.
I have no put a textview inside the stand1.xml Below.
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent">
<ListView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#+id/Stand1list">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/tex1"
/>
</ListView>
</FrameLayout>
And now i am getting error
java.lang.UnsupportedOperationException: addView(View, LayoutParams) is not supported in AdapterView

change your code to this instead:
View view = null;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.stand1,container,false);
populateListView(view);
return view;
}
private void populateListView(View mView) {
String[] pair = {"Pair1","Pair2","Pair3","Pair4","Pair5"};
//build adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity().getApplicationContext(), R.layout.stand1,pair);
//populate
ListView list = (ListView) mView.findViewById(R.id.Stand1list);
list.setAdapter(adapter);
}}

ListView listview; // define this on class level
View view = inflater.inflate(R.layout.stand1,container,false);
listview = view.findViewById(R.id.Stand1list);
populateListView();
retur view ;
And In populateListView() you set adapter in this way
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), R.layout.stand1,pair);

You are calling populateListView() too early, because your view isn't created yet.
Try use populateListView() in
public void onViewCreated (View view, Bundle savedInstanceState)

Declare the ListView as a member variable of the fragment:
ListView list; // your ListView
And instead of passing this to your ArrayAdapter, you need to pass getActivity(), the host activity's context.
And finally, initialize the listView inside the onCreateView method.
list = (ListView) findViewById(R.id.Stand1list);
CODE:
ListView list; // your ListView
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.stand1,container,false);
list = (ListView) view.findViewById(R.id.Stand1list);
populateListView();
}
private void populateListView(View mView) {
String[] pair = {"Pair1","Pair2","Pair3","Pair4","Pair5"};
//build adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), R.layout.stand1,pair);
list.setAdapter(adapter);
}

Your code is a fragment implementation code.
First error is about that ArrayAdapter needs Context as first argument.
So this in that place of code meansfragment object, but you need Context which could be Activity so instead of using this use getActivity() in those places
ArrayAdapter<String>(getActivity(), R.layout.stand1,pair);
and
ListView list = (ListView) getActivity().findViewById(R.id.Stand1list);
So how code should look like :
ListView mList;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.stand1,container,false);
mList = (ListView) root.findViewById(R.id.Stand1list);
return root;
}
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
populateListView();
}
private void populateListView() {
String[] pair = {"Pair1","Pair2","Pair3","Pair4","Pair5"};
//build adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(getActivity(), R.layout.stand1,pair);
mList.setAdapter(adapter);
}}

Some1 know why my listview data is not changing?

My listview gets filled on the start but after i cant find a way to make changes
pls see the code bellow
public class myFragment extends android.support.v4.app.Fragment
{
ListView list;
ArrayList<String> restorants=new ArrayList<String>();
Manager m=new Manager();
ArrayAdapter<String> adapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_, container, false);
list=(ListView) rootView.findViewById(R.id.myList);
for(Restorant r : m.getResByCity("nyc"))
{
restorants.add(r.getName());
}
adapter=new ArrayAdapter<String>(getActivity(), R.layout.item_list, R.id.restorantItem,restorants);
list.setAdapter(adapter);
return rootView;
}
public void makeChange(String s)
{
restorants.remove(0);
((ArrayAdapter)list.getAdapter()).notifyDataSetChanged();
}
}
While calling the method makeChange() i have checked that the restorants items are removing so that there is no problem with calling the method
makeChange() is called from my mainActivity that contains viewpager where this fragment is contained in the viewpager.

you need to remove the element from the dataset you provided to the adapter,
adapter.remove(s)
Here you can find the documentation

set list view adapter in a fragment in android

I want a custom row, so I am using a List View in an xml and inflating into a fragment. I am very confused of how to set the adapter for the list View.
I created a new adapter which extends Base Adapter. In the getView method, I really don't know what context to pass while inflating the row.xml layout.
How do I set the adapter for the list view and where?
public class ResultsFragment extends Fragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.results_layout, container, false);
listView = (ListView)v.findViewById(R.id.results);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
loadPage(dataBean.getWhat(), dataBean.getWhere(), dataBean.getPageStart());
//resultsAdapter.setRssData(rssData);
//setListAdapter(resultsAdapter);
}
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
Context context = getActivity().getApplicationContext();
resultsAdapter = new ResultsAdapter(context);
}
/**
* Set List Adapter
*/
private void setAdapter(){
if(listView.getAdapter() == null){
listView.setAdapter(resultsAdapter);
}
else{
resultsAdapter.notifyDataSetChanged();
}
}
}

You must extend Listfragment (instead of Fragment), and using its ListFragment.setListAdapter to set your adapter. In the adapter getView() inflate your row.. that s all

If you do not want to change your extended class, you should use listview.setAdapter(...) method. As you see in my example :
ListView productList= (ListView) getActivity().findViewById(R.id.product_list);
SampleAdapter adapter = new SampleAdapter(getActivity());
adapter.add(new SampleItem(
"Sunny LCD TV 2\" SN022L66-T1 Full HD",
R.drawable.product_sample_pic);
productList.setAdapter(adapter);