I have a pagerAdapter like this :
public class AppPagerAdapter extends PagerAdapter {
Context context;
public AppPagerAdapter(Context appcon)
{
this.context = context;
}
#Override
public int getCount() {
return 10;
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
View viewItem = inflater.inflate(R.layout.pager_layout, container, false);
ListView listView = (ListView) viewItem.findViewById(R.id.list);
}
}
And in my XML is this : "pager_layout.xml"
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
xmlns:wheel="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent">
<ListView
android:layout_width="wrap_content"
android:id="#+id/list"
android:divider="#color/activity_background"
android:layout_height="match_parent">
</ListView>
And, my main fragment page is this :
public class Apps extends Fragment {
public Apps() {}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
mRoot = inflater.inflate(R.layout.app_activity, container, false);
ViewPager pager = (ViewPager)mRoot.findViewById(R.id.view_pager);
AppPagerAdapter appadapter = new AppPagerAdapter(getActivity());
pager.setAdapter(appadapter);
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) { }
#Override
public void onPageSelected(int position) {
//Access to this position list view for add adapter
new Loading().execute; //async task to get data and add to list view from this pager
}
#Override
public void onPageScrollStateChanged(int state) {}
});
}
}
Now, How can I access this view on screen page for adding data to this page?
I want to add data to listview of page that is selected.
Please help me .
if your viewpager have 4 fragments: A,B,C,D. And you are open fragment A. Then Fragment B and D will be create automatically by Viewpager.
And if you want to add data to listView. Let see this method:
#Override
public Object instantiateItem(ViewGroup container, int position) {
View viewItem = inflater.inflate(R.layout.pager_layout, container, false);
ListView listView = (ListView) viewItem.findViewById(R.id.list);
}
What is
int position?
It is the Page that you selected - Openning.
Your above code will create 10 Page in ViewPager, each Page have the ListView. If you want to add data to this, only write more code in method
instantiateItem()
Related
So I have my main Bottom Navigation Activity, and there is three section one of which is dashboard. And I want to make a grid of categories in there. I've been trying to follow some guides on youtube about creation of GridView, but it seems to not work in this Bottom Navigation Activity. The main issue is that in my custom adapter in method getView it can't resolve R.layout.category_item but the file exists.
I would be grateful for some workaround or explanation of why it happens.
DashboardFragment class:
public class DashboardFragment extends Fragment {
private DashboardViewModel dashboardViewModel;
String[] category_names = {"one","two","three","four","five","six","seven","eight","nine","ten"};
int[] data ={1,2,3,4,5,6,7,8,9,10};
GridView gridView;
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
dashboardViewModel = ViewModelProviders.of(this).get(DashboardViewModel.class);
View root = inflater.inflate(R.layout.fragment_dashboard, container, false);
dashboardViewModel.getText().observe(getViewLifecycleOwner(), new Observer<String>() {
#Override
public void onChanged(#Nullable String s) {
}
});
gridView = root.findViewById(R.id.category_grid);
CustomAdapter customAdapter = new CustomAdapter();
gridView.setAdapter(customAdapter);
return root;
}
private class CustomAdapter extends BaseAdapter{
#Override
public int getCount() {
return category_names.length;
}
#Override
public Object getItem(int position) {
return null;
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View view1 = getLayoutInflater().inflate(R.layout.category_item,null);
return null;
}
}
}
category_item.xml :
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:tools="http://schemas.android.com/tools"
tools:context=".ui.dashboard.DashboardFragment">
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</androidx.constraintlayout.widget.ConstraintLayout>
Hi i don't know if it's the solution of your problem but you don't use any context when you inflate your view
#Override
public View getView(int position, View convertView, ViewGroup parent) {
// inflate the layout for each list row
if (convertView == null) {
convertView = LayoutInflater.from(context).
inflate(R.layout.layout_list_view_row_items, parent, false);
}
...
}
The button view shows confirming that the fragment shows, however the recycler view doesn't.
The logged array size of "jobs" is 1, confirming that getItemCount() isn't the problem and that the recycler adapter constructor is called. I'm reusing my JobRecyclerAdapter class but nothing's static, so there shouldn't be any interference between the two instances. The layout is a a copy of a working one I have, minus different ids and layout name, so that shouldn't be a problem either. There are no errors.
Layout
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
>
<include layout="#layout/top_bar"
android:id="#+id/topBarAJ"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:layout_constraintTop_toTopOf="parent"/>
<include layout="#layout/bottom_bar"
android:id="#+id/bottomBarAJ"
android:layout_height="wrap_content"
android:layout_width="match_parent"
app:layout_constraintBottom_toBottomOf="parent"/>
<androidx.recyclerview.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/activeJobRecyclerView"
app:layout_constraintTop_toBottomOf="#id/topBarAJ"
app:layout_constraintBottom_toTopOf="#id/bottomBarAJ"/>
<Button
android:id="#+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Button"
app:layout_constraintBottom_toTopOf="#+id/activeJobRecyclerView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.505"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/topBarAJ" />
</androidx.constraintlayout.widget.ConstraintLayout>
RecyclerAdapter
List<Job> jobs;
List<Drawable> images;
RecyclerViewClickListener clickListener;
public JobRecyclerAdapter(List<Job> downloadedJobs, List<Drawable> images, RecyclerViewClickListener clickListener) {
this.jobs = downloadedJobs;
this.images = images;
Integer arraySize = images.size();
Log.d("downloadActiveJob", "JobRecyclerAdapter: images array size: " + arraySize.toString());
arraySize = jobs.size();
Log.d("downloadActiveJob", "JobRecyclerAdapter: jobs array size: " + arraySize.toString());
this.clickListener = clickListener;
}
class JobCardViewHolder extends RecyclerView.ViewHolder {
public ImageView itemImage;
public TextView itemName;
public TextView itemWeight;
public TextView itemSize;
public TextView transmitterName;
public JobCardViewHolder(View v) {
super(v);//call default constructor
v.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("RecyclerView", "onClick：" + getAdapterPosition());
clickListener.recyclerViewListClicked(v, getAdapterPosition());
}
});
itemImage = (ImageView) v.findViewById(R.id.itemImage);
itemName = (TextView) v.findViewById(R.id.itemName);
itemWeight = v.findViewById(R.id.itemWeight);
itemSize = v.findViewById(R.id.itemSize);
transmitterName = v.findViewById(R.id.transmitterName);
}
}
public void removeItem(int jobIndex) {
jobs.remove(jobIndex);
notifyDataSetChanged();
}
#Override
public JobCardViewHolder onCreateViewHolder(ViewGroup vg, int n) {
View v = LayoutInflater.from(vg.getContext()).inflate(R.layout.job_card_layout, vg, false);
JobCardViewHolder vH = new JobCardViewHolder(v);
return vH;
}
#Override
public void onBindViewHolder(JobCardViewHolder vH, int position) {
vH.itemName.setText(jobs.get(position).itemName);
vH.itemImage.setImageDrawable(images.get(position));
vH.itemWeight.setText(jobs.get(position).itemWeight);
vH.itemSize.setText(jobs.get(position).itemSize);
vH.transmitterName.setText(jobs.get(position).transmitterName);
}
#Override
public int getItemCount() {
return jobs.size();
}
}
Fragment (I only showed the relevant parts of the fragment.)
RecyclerView jobRecyclerView;
JobRecyclerAdapter jobRecyclerAdapter;
LinearLayoutManager llm;
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sub_fragment_active_jobs_1, container, false);
this.jobRecyclerView = view.findViewById(R.id.activeJobRecyclerView);
return view;
}
public void configureJobsRecyclerAdapter(Job activeJob, List<Drawable> imageDrawables) {
Log.d("downloadActiveJob", "configureJobRecyclerAdapter called");
List<Job> downloadedJobs = new ArrayList<>();
downloadedJobs.add(activeJob);
Integer arraySize = imageDrawables.size();
Log.d("downloadActiveJob", "configureJobRecyclerAdapter: " + arraySize.toString());
jobRecyclerAdapter = new JobRecyclerAdapter(downloadedJobs, imageDrawables, this);
llm = new LinearLayoutManager(context);
jobRecyclerView.setLayoutManager(llm);
jobRecyclerView.setAdapter(jobRecyclerAdapter);
}
Update: If I move the recycler view/adapter setup code to onResume, the recycler view is visible. When I update the recycler view with a new adapter, the recycler view becomes invisible.
If I can't solve it using this new discovery I'll post the whole fragment.
Hey, you create the function configureJobsRecyclerAdapter() but didn't call it inside fragment onCreateView(). Like...
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.sub_fragment_active_jobs_1, container, false);
this.jobRecyclerView = view.findViewById(R.id.activeJobRecyclerView);
configureJobsRecyclerAdapter()//Add this line.
return view;
}
if you are fetching data which are required for configureJobsRecyclerAdapter() from an api maybe you are setting empty list at the time when you are calling configureJobsRecyclerAdapter(). and that's why when you call it in onResume, the list becomes visible(because then data is fetched).
and don't forget to call adapter.notifyDataSetChanged() after each change in your list.
I try do it with below code but it not working! Please help me... I am confused ...
In below code all things is good but onItemClickListener is useless and it is in onCreateView method is wrong?
My items layout is not problem..
public class favFrg extends Fragment {
View v;
ListView listView;
List<HashMap<String,Object>> listFav;
DatabaseManager dbManager;
public favFrg() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
v= inflater.inflate(R.layout.fragment_fav_frg, container, false);
listView= v.findViewById(R.id.listViewFav);
dbManager=new DatabaseManager(getContext());
dbManager.openDB();
listFav=dbManager.getStoryFavorite();
dbManager.closeDB();
String[] keys={"id","txtName"};
int[] resources={R.id.favTxtViewNumberStory,R.id.favTxtViewTitleStory};
SimpleAdapter adapter=new SimpleAdapter(getContext(),listFav,R.layout.fav_item_layout,keys,resources);
listView.setAdapter(adapter);
Log.i("ListView","Adapter Set");
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Log.i("ListView","click item");
Toast.makeText(getActivity(),"Clicked",Toast.LENGTH_SHORT).show();
}
});
Log.i("ListView","Return View");
return v;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
Just Only clickable and focusable attr in my item layout should be false... and works for me
https://code.i-harness.com/en/q/1561bd1
instead of getContext() use container.getContext() in creating adapter for listview.
Try making the SimpleAdapter as a public variable and put it outside the class onCreateView
I created a ListView within a fragment and populated it with data from a class called Workout within the onStart() method. I set an Adapter and the list shows up fine. I would like to now be able to get the value of the specific row that the user clicks but am unable to implement an onItemClicked() method. Does anyone know how I can get this value? Thank you.
public class WorkoutListFragment extends Fragment {
static interface WorkoutListListener{
void itemClicked(long id);
}
private WorkoutListListener listener;
private ListView workoutList;
private LayoutInflater inflate;
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
inflate = inflater;
return inflater.inflate(R.layout.fragment_workout_list, container, false);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
this.listener = (WorkoutListListener)activity;
}
#Override//ISSUE IS IN HERE
public void onStart() {
super.onStart();
View view = getView();
String[]names = new String[Workout.workouts.length];
for (int i = 0; i < names.length; i++){
names[i] = Workout.workouts[i].getName();
}
if (view!=null){
workoutList = (ListView)view.findViewById(R.id.listView);
ArrayAdapter<String>adapter = new ArrayAdapter<String>(inflate.getContext(),
android.R.layout.simple_list_item_1,names);
workoutList.setAdapter(adapter);
}
//HOW CAN I NOW GET THE VALUE OF THE ITEM CLICKED?
// I TRIED THIS BUT IT'S NOT RECOGNIZED
workoutList.setOnClickListener(new onItemClickListener);
}
Use this:
workoutList.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// the 'position' argument is the position you are looking for
}
});
EDIT:
I noticed that you are not initializing the workoutList listView. You should do that in the OnCreateView method:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_workout_list, container, false);
workoutList = (ListView) view.findViewById(R.id.workoutListView); // assuming that your listView's id is "#+id/workoutListView"
return view;
}
Im trying to add a listview inside a fragment witch is also inside a tabhost. the app is not crashing or anything, but the list view is not showing anything.
Here is my code:
Class for the tabPager
public class TabPagerAdapter extends FragmentPagerAdapter {
public TabPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new FragmentHome();
case 1:
return new FragmentBadges();
case 2:
return new FragmentBenefits();
}
return null;
}
Following is the fragment where I want the listview:
public class FragmentBadges extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_badges_list, null);
BadgesListAdapter adapter = new BadgesListAdapter(this.getActivity(), getCurrentBadges());
ListView badgeslist = (ListView) rootView.findViewById(R.id.badges_list);
badgeslist.setAdapter(adapter);
badgeslist.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
//TODO do some
}
});
return rootView;
}
And following is the adapter:
public class BadgesListAdapter extends ArrayAdapter<String> {
private final Activity context;
private List<Badge> badges;
public BadgesListAdapter(Activity context, List<Badge> badges) {
super(context, R.layout.fragment_badges_listrow);
this.context = context;
this.badges = badges;
}
#Override
public View getView(int position, View view, ViewGroup parent) {
LayoutInflater inflater = context.getLayoutInflater();
View rowView= inflater.inflate(R.layout.fragment_badges_listrow, null, true);
TextView txtTitle = (TextView) rowView.findViewById(R.id.text);
ImageView imageView = (ImageView) rowView.findViewById(R.id.img);
txtTitle.setText(badges.get(position).getName());
imageView.setImageResource(badges.get(position).getDrawableValue());
return rowView;
}
while debugging I found out that the getView method inside the badgesListAdapter is never called.
I have this same code for another app but without the tabpager and there it all works perfectly...
Check whether getCurrentBadges() method not returns empty list. If so there is no data to show in ListView.
I was able to make it work by inhering ListFragment in FragmentBadges, following this tutorial https://www.youtube.com/watch?v=heR4zhj_wV0