I have a fragment class that contains edit text,button and the recycler view. my recycler view use an xml layout of card view. my card view contains text view and a button(?) to show a pop up after being clicked.
I tried to add the pop up code in my fragment class as I usually do, but it's pointing out that my fragment doesn't have access to recycler's view card view layout. So I tried to add it in my adapter class but I'm getting stuck with getActivty() not getting recognize.
this is what I added in my view holder method inside on click
btnHelp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Popup_FreedomWall popup_freedomWall = new Popup_FreedomWall();
Bundle args = new Bundle();
System.out.println("=================TVFWID==========================");
System.out.println(tvFwId.getText().toString());
System.out.println("=====================TVFWID======================");
//data to get for report - uid(reported,get reported),freedom wall id
args.putString("user", mod_freedomWall.uid_report);
args.putString("reportedPost", tvFwId.getText().toString());
popup_freedomWall.setArguments(args);
popup_freedomWall.show();
popup_freedomWall.show(getActivity().getSupportFragmentManager(), "My Fragment");
}
});
```
<br/>
`Mod_FreedomWall.java` my Fragment
public class Mod_FreedomWall extends Fragment {
RecyclerView recyclerView;
Mod_FreedomWall_UserAdapter myAdapter;
FragmentManager fragmentManager;
ArrayList<Mod_FreedomWall_User> user;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.mod_freedomwall, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.freedomWallPost);
return v;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView = (RecyclerView) view.findViewById(R.id.freedomWallPost);
recyclerView.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, true);
layoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(layoutManager);
btnPost.setOnClickListener(new View.OnClickListener() {
final Date c = Calendar.getInstance().getTime();
final SimpleDateFormat df = new SimpleDateFormat("MM-dd-yy", Locale.getDefault());
final String formattedDate = df.format(c);
final Date currentTime = Calendar.getInstance().getTime();
final DateFormat dateFormat = new SimpleDateFormat("hh.mm aa");
final String dateString = dateFormat.format(new Date());
#Override
public void onClick(View v) {
String message = etPost.getText().toString();
createPost(message, user_name, dateString, formattedDate, level);
myAdapter.notifyDataSetChanged();
etPost.setText("");
}
});
user = new ArrayList<Mod_FreedomWall_User>();
retrievePost();
myAdapter = new Mod_FreedomWall_UserAdapter(this, user);
myAdapter.setListener(new Mod_FreedomWall_UserAdapter.MyListener() {
#Override
public void onItemClicked(String uid, String fwid) {
Popup_FreedomWall popup_freedomWall = new Popup_FreedomWall();
Bundle args = new Bundle();
//just to see if I'm getting data
System.out.println("=================TVFW==========================");
System.out.println(fwid);
System.out.println("=====================TVFW======================");
args.putString("user",uid);
args.putString("reportedPost", fwid);
popup_freedomWall.setArguments(args);
popup_freedomWall.show(getActivity().getSupportFragmentManager(), "pop_upFreedomWall");
}
});
recyclerView.setAdapter(myAdapter);
}
My Adapter
public class Mod_FreedomWall_UserAdapter extends RecyclerView.Adapter<Mod_FreedomWall_UserAdapter.ViewHolder> {
Mod_FreedomWall mod_freedomWall = new Mod_FreedomWall();
private ArrayList<Mod_FreedomWall_User> user;
String freeId,reporterId;
public Mod_FreedomWall_UserAdapter(Mod_FreedomWall context, ArrayList<Mod_FreedomWall_User> list){
user = list;
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView ivUserProfile;
TextView tv_message,tv_username,tv_date,tvTime,tvFwId;
Button btnHelp;
public ViewHolder(#NonNull View itemView) {
super(itemView);
btnHelp = (Button) itemView.findViewById(R.id.btnHelp);
ivUserProfile = (ImageView) itemView.findViewById(R.id.ivUserProfile);
tv_message = (TextView) itemView.findViewById(R.id.tv_message);
tv_username = (TextView) itemView.findViewById(R.id.tv_username);
tv_date = (TextView) itemView.findViewById(R.id.tv_date);
tvTime = (TextView) itemView.findViewById(R.id.tvTime);
tvFwId = (TextView) itemView.findViewById(R.id.tvFwId);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
btnHelp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
System.out.println("=================TVFWID==========================");
System.out.println(tvFwId.getText().toString());
System.out.println("=====================TVFWID======================");
freeId = tvFwId.getText().toString();
reporterId = mod_freedomWall.uid_report;
}
});
}
});
}
}
#NonNull
#Override
public Mod_FreedomWall_UserAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
View v = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.mod_freedomwall_post,viewGroup,false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull Mod_FreedomWall_UserAdapter.ViewHolder viewHolder, int position) {
viewHolder.itemView.setTag(user.get(position));
viewHolder.tvFwId.setVisibility(View.INVISIBLE);
viewHolder.tv_message.setText(user.get(position).getMessage());
viewHolder.tv_username.setText(user.get(position).getUsername());
viewHolder.tv_date.setText(user.get(position).getDate());
viewHolder.tvTime.setText(user.get(position).getTime());
viewHolder.tvFwId.setText(user.get(position).getFreedomWallId());
viewHolder.ivUserProfile.setImageResource(R.drawable.ic_username_white);
}
#Override
public int getItemCount() {
return user.size();
}
public interface MyListener {
void onItemClicked(String uid,String fwid);
}
MyListener mListener;
public void setListener(MyListener listener) {
mListener = listener;
}
}
Thank you in advance!
From what I understand you have two possible approaches to this problem.
Send a Context with in your Adapter's constructor and replace the part where you need the "getActivity()" with that context you passed through (obv via a variable in your Adapter).
Use an Interface approach.
I never like the Context style, so I'll give you an example for an Interface approach.
In your Adapter:
public abstract class YourAdapter extends ...<> {
public interface MyListener {
void onItemClicked(String someData); //can change this variable to whatever is needed, if any.
}
MyListener mListener;
...
Then let the onClickListener of the button call the Interface function you just created instead of trying to make a popup directly:
btnHelp.setOnClickListener(v -> onItemClicked("this is my data i pass through");
Then add a function to your Adapter to set the listener (or add it as argument in the constructor, whatever you want):
public void setListener(MyListener listener) {
mListener = listener;
}
And implement the listener in your Fragment:
adapter.setListener(new YourAdapter.MyListener() {
#Override
public void onItemClicked(String myData) {
//create your popup and simply call getActivity() since this is inside the Fragment
}
});
--- Your Fragment ---
public class Mod_FreedomWall extends Fragment {
RecyclerView recyclerView;
RecyclerView.Adapter myAdapter; //<-- 1 *remove*
RecyclerView.LayoutManager layoutManager; // obsolete, can be deleted. You make a local variable later on.
Mod_FreedomWall_UserAdapter adapter; // <-- 2 *rename to myAdapter*
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.mod_freedomwall, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.freedomWallPost);
return v;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView = (RecyclerView) view.findViewById(R.id.freedomWallPost);
recyclerView.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, true);
layoutManager.setStackFromEnd(true);
recyclerView.setLayoutManager(layoutManager);
// You call a function of `adapter` here, but adapter hasn't been
// properly initialised yet, it's null so far, so that won't go well.
// *rename adapter to myAdapter and move this part down*
adapter.setListener(new Mod_FreedomWall_UserAdapter.MyListener() {
#Override
public void onItemClicked(String uid, String fwid) {
Popup_FreedomWall popup_freedomWall = new Popup_FreedomWall();
Bundle args = new Bundle();
//data to get for report - uid(reported,get reported),freedom wall id
args.putString("user",uid);
args.putString("reportedPost", fwid);
popup_freedomWall.setArguments(args);
popup_freedomWall.show(getActivity().getSupportFragmentManager(), "My Fragment");
}
});
btnPost.setOnClickListener(new View.OnClickListener() {
final Date c = Calendar.getInstance().getTime();
final SimpleDateFormat df = new SimpleDateFormat("MM-dd-yy", Locale.getDefault());
final String formattedDate = df.format(c);
final Date currentTime = Calendar.getInstance().getTime();
final DateFormat dateFormat = new SimpleDateFormat("hh.mm aa");
final String dateString = dateFormat.format(new Date());
#Override
public void onClick(View v) {
String message = etPost.getText().toString();
createPost(message, user_name, dateString, formattedDate, level);
myAdapter.notifyDataSetChanged();
etPost.setText("");
}
});
user = new ArrayList<Mod_FreedomWall_User>();
retrievePost();
//Here you initialise your adapter
myAdapter = new Mod_FreedomWall_UserAdapter(this, user);
//you can move your `myAdapter.setListener` to this spot.
recyclerView.setAdapter(myAdapter);
}
Well, you declared two adapters but only really used one. Seems a bit mixed up.
To-do;
Scrap one of the adapters (number 1). Then the simplest way is to rename adapter at number 2 to myAdapter and also change the adapter at adapter.setListener to myAdapter.setListener(....
Then move that myAdapater.setListener(... to a place below myAdapter = new Mod_FreedomWall_UserAdapter(this, user); since that is where you actually initialise your adapter. Before that point you can't safely call the your adapter's functions.
Related
I am new to android firebase. The question I have is. The first is to distribute the date from an Activity to several fragments. So far I have solved that problem. But I have a requirement to display the data in Firebase database in each Fragment. But the problem is that the application stops after entering the data in firebase.
stdAttn Activity
public class stdAttnDisplay extends AppCompatActivity {
private ViewPager pager;
private TabLayout tabs;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_std_attn_display);
pager=(ViewPager) findViewById(R.id.vpager);
tabs=(TabLayout) findViewById(R.id.tablayout1);
tabs.setupWithViewPager(pager);
tabs.setTabGravity(TabLayout.GRAVITY_FILL);
tabs.setTabMode(TabLayout.MODE_SCROLLABLE);
setupViewPager(pager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
//bundle
Bundle bundle =new Bundle();
bundle.putString("DATE","01-05-2023");
IABF_Attnfrag frag_iabf = new IABF_Attnfrag();
DABF_Attnfrag frag_dabf = new DABF_Attnfrag();
CMA_Attnfrag frag_cma = new CMA_Attnfrag();
CHARTERED_Attnfrag frag_chartered = new CHARTERED_Attnfrag();
ENGLISH_Attnfrag frag_english = new ENGLISH_Attnfrag();
AAT1_Attnfrag frag_aat1 = new AAT1_Attnfrag();
AAT2_Attnfrag frag_aat2 = new AAT2_Attnfrag();
AAT3_Attnfrag frag_aat3 = new AAT3_Attnfrag();
frag_iabf.setArguments(bundle);
frag_dabf.setArguments(bundle);
frag_cma.setArguments(bundle);
frag_chartered.setArguments(bundle);
frag_english.setArguments(bundle);
frag_aat1.setArguments(bundle);
frag_aat2.setArguments(bundle);
frag_aat3.setArguments(bundle);
adapter.addFrag(frag_iabf,"IABF");
adapter.addFrag(frag_dabf,"DABF");
adapter.addFrag(frag_cma,"CMA");
adapter.addFrag(frag_chartered,"CHARTERED");
adapter.addFrag(frag_english,"ENGLISH");
adapter.addFrag(frag_aat1,"AAT-i");
adapter.addFrag(frag_aat2,"AAT-ii");
adapter.addFrag(frag_aat3,"AAT-iii");
viewPager.setAdapter(adapter);
}
}
Fragment
public class IABF_Attnfrag extends Fragment {
String dateTxt;
private Bundle bundle;
myadapter adapter;
RecyclerView recViewiabf;
private DatabaseReference propertyRef;
public IABF_Attnfrag() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_i_a_b_f__attnfrag, container, false);
recViewiabf = (RecyclerView) view.findViewById(R.id.recViewiabf);
bundle = this.getArguments();
dateTxt = bundle.getString("DATE");
Log.e("DATE_FRAG_INBOUND",""+dateTxt);
propertyRef = FirebaseDatabase.getInstance()
.getReference()
.child("attendance")
.child("IABF")
.child(dateTxt);
propertyRef.keepSynced(true);
recViewiabf.setLayoutManager(new LinearLayoutManager(getContext()));
FirebaseRecyclerOptions<modelAttn> options =
new FirebaseRecyclerOptions.Builder<modelAttn>()
.setQuery(propertyRef, modelAttn.class)
.build();
adapter = new myadapter(options);
recViewiabf.setAdapter(adapter);
return view;
}
#Override
public void onStart() {
super.onStart();
adapter.startListening();
}
#Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
}
Adapter
public class myadapter extends FirebaseRecyclerAdapter<modelAttn,myadapter.myviewholder>
{
public myadapter(#NonNull FirebaseRecyclerOptions<modelAttn> options) {
super(options);
}
#Override
protected void onBindViewHolder(#NonNull myviewholder holder, int position, #NonNull modelAttn model) {
holder.stdFulName.setText(model.getName());
holder.stdidtv.setText(model.getSt_id());
}
#NonNull
#Override
public myviewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.attn_item,parent,false);
return new myviewholder(view);
}
public class myviewholder extends RecyclerView.ViewHolder {
TextView stdFulName, stdidtv;
public myviewholder(#NonNull View itemView) {
super(itemView);
stdidtv = itemView.findViewById(R.id.indextext);
stdFulName = itemView.findViewById(R.id.nametext);
}
}
}
Model Attn
public class modelAttn {
String Name, st_id;
public modelAttn() {
}
public modelAttn(String name, String st_id) {
this.Name = name;
this.st_id = st_id;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public String getSt_id() {
return st_id;
}
public void setSt_id(String st_id) {
this.st_id = st_id;
}
}
FireBase Database Screenshot
Database Screenshot
What I need is to distribute the data from the Activity to the Fragment and then display the relevant data in the RecyclerView using the data in the Firebase database.
If you create a regular adapter then pass it a list of custom objects which you retrieve from firebase. You can make a static list on your MainActivity that can be referenced anywhere including in the fragment.
I've been trying to delete data from firebase with an OnClick RecyclerView method, but nothing works. I can't even make my OnClick method works. I have watched videos and tutorials, I've tried so much stuff and nothing helps...
Here is my adapter class:
public class myadapter extends RecyclerView.Adapter<myadapter.myviewholder>{
ArrayList<datamodel> dataholder;
public myadapter(ArrayList<datamodel> dataholder) {
this.dataholder = dataholder;
}
#NonNull
#Override
public myviewholder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_list, parent, false);
return new myviewholder(view);
}
#Override
public void onBindViewHolder(#NonNull myviewholder holder, int position) {
Glide.with(holder.itemView.getContext()).load(dataholder.get(position).getImageurl()).into(holder.CircleImg);
holder.header.setText(dataholder.get(position).getHeader());
holder.descr.setText(dataholder.get(position).getDescr());
holder.price.setText(dataholder.get(position).getPrec());
}
#Override
public int getItemCount() {
return dataholder.size();
}
class myviewholder extends RecyclerView.ViewHolder{
CircleImageView CircleImg;
TextView header, descr, price;
public myviewholder(#NonNull View itemView) {
super(itemView);
CircleImg = itemView.findViewById(R.id.circle1);
header = itemView.findViewById(R.id.txtheader1);
descr = itemView.findViewById(R.id.txtdescr1);
price = itemView.findViewById(R.id.txtprecio1);
}
}
And my fragment (the one that have the recyclerView):
public class articulos extends Fragment {
private FirebaseUser firebaseUser;
private String uid;
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private DatabaseReference myRef;
private Context mContext;
private myadapter myadapter;
RecyclerView recyclerView;
ArrayList<datamodel> dataholder;
public articulos() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment articulos.
*/
// TODO: Rename and change types and number of parameters
public static articulos newInstance(String param1, String param2) {
articulos fragment = new articulos();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_articulos, container, false);
recyclerView = view.findViewById(R.id.rv);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
myRef = FirebaseDatabase.getInstance().getReference();
dataholder= new ArrayList<>();
getDataFromFirebase();
//datamodel ob1 = new datamodel("Esta nueva", "5000MXN", "wwsad.adasd", "asdasdsa");
// dataholder.add(ob1);
//recyclerView.setAdapter(new myadapter(dataholder));
return view;
}
private void getDataFromFirebase() {
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
uid = firebaseUser.getUid();
Query query = myRef.child("Usuarios").child(uid).child("articulos");
query.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
ClearAll();
for(DataSnapshot snapshot1 : snapshot.getChildren()){
datamodel datamodel = new datamodel();
datamodel.setImageurl(snapshot1.child("imageurl").getValue(String.class));
datamodel.setDescr(snapshot1.child("descripcion").getValue(String.class));
datamodel.setHeader(snapshot1.child("nombre").getValue(String.class));
datamodel.setPrec(snapshot1.child("precio").getValue(String.class));
dataholder.add(datamodel);
}
myadapter = new myadapter(dataholder);
recyclerView.setAdapter(new myadapter(dataholder));
myadapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
private void ClearAll(){
if(dataholder != null){
dataholder.clear();
if(myadapter != null){
myadapter.notifyDataSetChanged();
}
}
dataholder = new ArrayList<>();
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Button mbtnNuevoArticulo = view.findViewById(R.id.btnNuevoArticulo);
mbtnNuevoArticulo.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Navigation.findNavController(v).navigate(R.id.agregarart);
}
});
}
If anyone can tell me what to do and how to do it, please.. I need it so bad
Try set onclicklistener on viewholder class
class myviewholder extends RecyclerView.ViewHolder implements View.OnClickListener {
CircleImageView CircleImg;
TextView header, descr, price;
public myviewholder(#NonNull View itemView) {
super(itemView);
CircleImg = itemView.findViewById(R.id.circle1);
header = itemView.findViewById(R.id.txtheader1);
descr = itemView.findViewById(R.id.txtdescr1);
price = itemView.findViewById(R.id.txtprecio1);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View view) {
//do something when clicked
}
}
You can apply onclick listener by using following code :
holder.header.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//do something.
}
});
add this code in your onBindViewHolder of Adapter. Just make sure to change the id of holder.
full code :
#Override
public void onBindViewHolder(#NonNull myviewholder holder, int position) {
Glide.with(holder.itemView.getContext()).load(dataholder.get(position).getImageurl()).into(holder.CircleImg);
holder.header.setText(dataholder.get(position).getHeader());
holder.descr.setText(dataholder.get(position).getDescr());
holder.price.setText(dataholder.get(position).getPrec());
holder.header.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//do something.
}
});
}
Create object of view inside your view holder and also initialize button.setOnClickListener(this) inside viewHolder itself and setting on click inside onBinfViewHolder(...)(only in JAVA). In kotlin you just need to set on click method inside onBindViewHolder(...).
Example:
class YourAdapter():RecyclerView.Adapter<YourAdapter.YourViewHolder>() {
class YourViewHolder(view: View):RecyclerView.ViewHolder(view){
val yourButton:Button = view.findViewById(R.id.landingViewBtn)
}
override fun onBindViewHolder(holder: YourViewHolder, position: Int) {
holder.yourButton.setOnClickListener {
//do Something
val intent = Intent(context,nextActivity::class.java)
context.startActivity(intent)
}
}
}
I need some help for a summer project
This is my Events fragment
This is my MyList fragment
I'm using a RecyclerView+Cardview to display the Events. The idea is that the user can click the big plus on the right side of each card, and the card would be displayed in the MyList fragment. I would like to ask if it's possible to transfer a card directly from one fragment to another? Also, both fragments are contained within the same activity, which makes it a little trickier(I haven't found any available solutions).
If that is not possible, another way is to transfer the reference type object contained in the CardView to the MyList fragment. However, this is even less straightforward. This is because the button is inflated in the adapter, but there is no reference type object created here. I have seen many tutorials on using the Parcelable interface, however, I don't know how to implement it here when I'm unable to even create the object in the adapter. The reference object is created in another activity and stored in Firebase before it is read and displayed.
I'm going to attach my EventsAdapter.java and EventsItem.java and EventsFragment.java code below, but please let me know if I should include more code to describe the problem.
Thanks for reading my very long post!!
public class EventsAdapter extends RecyclerView.Adapter<EventsAdapter.EventsViewHolder> implements Filterable {
private ArrayList<EventsItem> mEventsList;
private ArrayList<EventsItem> mEventsListFull;
private EventsAdapter.OnItemClickListener mListener;
private Context mContext;
private DateFormat df = DateFormat.getDateInstance(DateFormat.MEDIUM, Locale.UK);
public interface OnItemClickListener {
void onItemClick(int position);
}
//the ViewHolder holds the content of the card
public static class EventsViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public ImageView mAddButton;
public TextView mTextView1;
public TextView mTextView2;
public TextView mTextView3;
public TextView mTextView4;
public TextView mTextView5;
public EventsViewHolder(Context context, View itemView, final EventsAdapter.OnItemClickListener listener) {
super(itemView);
final Context context1 = context;
mImageView = itemView.findViewById(R.id.imageView);
mAddButton = itemView.findViewById(R.id.image_add);
mTextView1 = itemView.findViewById(R.id.title);
mTextView2 = itemView.findViewById(R.id.event_description);
mTextView3 = itemView.findViewById(R.id.date);
mTextView4 = itemView.findViewById(R.id.location);
mTextView5 = itemView.findViewById(R.id.time);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (listener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
listener.onItemClick(position);
}
}
}
});
mAddButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String str1 = mTextView1.getText().toString();
String str2 = mTextView2.getText().toString();
String str3 = mTextView3.getText().toString();
String str4 = mTextView4.getText().toString();
String str5 = mTextView5.getText().toString();
Bundle bundle = new Bundle();
bundle.putString("title", str1);
bundle.putString("event description", str2);
bundle.putString("date", str3);
bundle.putString("location", str4);
bundle.putString("time", str5);
MylistFragment mlf = new MylistFragment();
mlf.setArguments(bundle);
}
});
}
}
//Constructor for EventsAdapter class. This ArrayList contains the
//complete list of items that we want to add to the View.
public EventsAdapter(Context context, ArrayList<EventsItem> EventsList) {
mEventsList = EventsList;
mContext = context;
mEventsListFull = new ArrayList<>(EventsList); // copy of EventsList for SearchView
}
//inflate the items in a EventsViewHolder
#NonNull
#Override
public EventsAdapter.EventsViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.event_item, parent, false);
EventsAdapter.EventsViewHolder evh = new EventsAdapter.EventsViewHolder(mContext, v, mListener);
return evh;
}
#Override
public void onBindViewHolder(#NonNull EventsAdapter.EventsViewHolder holder, int position) {
EventsItem currentItem = mEventsList.get(position);
holder.mImageView.setImageResource(currentItem.getProfilePicture());
holder.mTextView1.setText(currentItem.getTitle());
holder.mTextView2.setText(currentItem.getDescription());
holder.mTextView3.setText(df.format(currentItem.getDateInfo()));
holder.mTextView4.setText(currentItem.getLocationInfo());
holder.mTextView5.setText(currentItem.getTimeInfo());
}
#Override
public int getItemCount() {
return mEventsList.size();
}
public class EventsItem implements Occasion, Parcelable {
//fields removed for brevity
//constructor removed for brevity
}
public EventsItem() {
}
public EventsItem(Parcel in) {
profilePicture = in.readInt();
timeInfo = in.readString();
hourOfDay = in.readInt();
minute = in.readInt();
locationInfo = in.readString();
title = in.readString();
description = in.readString();
}
public static final Creator<EventsItem> CREATOR = new Creator<EventsItem>() {
#Override
public EventsItem createFromParcel(Parcel in) {
return new EventsItem(in);
}
#Override
public EventsItem[] newArray(int size) {
return new EventsItem[size];
}
};
//getter methods have been removed for brevity
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeInt(profilePicture);
dest.writeString(timeInfo);
dest.writeString(locationInfo);
dest.writeString(title);
dest.writeString(description);
dest.writeString(df.format(dateInfo));
dest.writeInt(hourOfDay);
dest.writeInt(minute);
}
}
public class EventsFragment extends Fragment {
ArrayList<EventsItem> EventsItemList;
FirebaseDatabase mDatabase;
DatabaseReference mDatabaseReference;
ValueEventListener mValueEventListener;
private RecyclerView mRecyclerView;
private RecyclerView.LayoutManager mLayoutManager;
private EventsAdapter mAdapter;
private View rootView;
public FloatingActionButton floatingActionButton;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_events, container, false);
mDatabase = FirebaseDatabase.getInstance();
mDatabaseReference = mDatabase.getReference().child("Events");
createEventsList();
buildRecyclerView();
floatingActionButton = rootView.findViewById(R.id.fab);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(getActivity(), EventsAdder.class);
startActivity(intent);
}
});
mValueEventListener = new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
EventsItemList.add(snapshot.getValue(EventsItem.class));
}
EventsAdapter eventsAdapter = new EventsAdapter(getActivity(), EventsItemList);
mRecyclerView.setAdapter(eventsAdapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
};
mDatabaseReference.addValueEventListener(mValueEventListener);
setHasOptionsMenu(true);
Toolbar toolbar = rootView.findViewById(R.id.events_toolbar);
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
return rootView;
}
public void createEventsList() {
EventsItemList = new ArrayList<>();
}
public void buildRecyclerView() {
mRecyclerView = rootView.findViewById(R.id.recyclerview);
mLayoutManager = new LinearLayoutManager(getContext());
mAdapter = new EventsAdapter(getActivity(), EventsItemList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
}
}
If you would like to see the same CardView within the MyListFragment, you could have the MyListFragment contain a RecyclerView, and reuse the same EventsAdapter and EventsViewHolder. The only difference is that rather than populating the adapter with all the children of the "Events" from your database, you would only populate it with the single Event that you want.
Also, since you have made your Event class implement parcelable, you do not need to manually create the bundle when clicking the plus button.
I am assuming you have a single Activity, and you simply want to replace the EventsFragment with the MyListFragment. Checkout the docs for replacing one fragment with another.
Step 1:
Extend your onItemClickListener to look like:
public interface OnItemClickListener {
void onItemClick(int position);
void onPlusButtonClick(int position);
}
and adjust the code in your EventsViewHolder constructor to look like this when the plus button is clicked:
mAddButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (listener != null) {
// no need to manually create the bundle here
// you already have all the information you need
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
listener.onPlusButtonClick(position);
}
}
}
});
Step 2:
Implement our new method onPlusButtonClick. As per our discussion in the comments, it seems you do not implement this interface anywhere. You can implement it inside the constructor to your EventsAdapter:
public EventsAdapter(Context context, ArrayList<EventsItem> EventsList) {
mEventsList = EventsList;
mContext = context;
mEventsListFull = new ArrayList<>(EventsList); // copy of EventsList for SearchView
mListener = new OnItemClickListener() {
#Override
public void onItemClick() {
// handle clicking the entire view holder
// NOTE: inside your EventsViewHolder, it looks like you call this method on the entire itemView. This could 'swallow' the click on the plus button. You may need to adjust your code to handle this.
}
#Override
public void onPlusButtonClick(int position) {
MyListFragment myListFragment = new MyListFragment();
Event event = mEventsList.get(position);
Bundle bundle = new Bundle();
bundle.putExtra("event", event); // this will work due to implementing parcelable
myListFragment.setArguments(bundle);
// use mContext since im assuming we areinside adapter
// if in an Activity, no need to use context to get the fragment manager
FragmentTransaction transaction = mContext.getSupportFragmentManager().beginTransaction();
// Replace the EventsFragment with the MyListFragment
// and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, myListFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
}
}
}
Step 3:
Inside your MyListFragments onCreateView() method:
#Override
public View onCreateView (
LayoutInflater inflater,
ViewGroup container,
Bundle savedInstanceState
) {
Bundle bundle = getArguments();
Event event = bundle.getExtra("event"); // again, will work due to implementing parcelable
// from here you should bind to a recycler view, and you can even reuse your adapter like so:
List<EventsItem> singleEventList = new List<EventsItem>();
singleEventList.add(event);
EventsAdapter adapter = new EventsAdapter(getActivity(), singleEventList);
// be sure to inflate and return your view here...
}
and you should be good to go!
I have left out bits of code here and there for simplicity.. but I hope this is understandable.
As a side note.. in your firebase database listener, it is bad practice to create a new EventsAdapter every single time your data is updated. Instead, you should update the data in the adapter with the new values. Do this by creating a public method inside the adapter such as replaceEvents(List<EventsItem> newEvents), and inside, replace mEventsList with the new events, then call notifyDataSetChanged().
I am having problems updating my RecyclerView with new data. If I press a confirmation button on a CardView in the first tab, the card should get added to the second tab but it won't update it there until I rotate the screen. I get the data for the card from reading a text file. Please advise me how to call the notifyDataSetChange method after I have added the new data to my text file. I have tried everything and all I get is NullPointerExceptions. The RecyclerViews are in fragments and I use FragementStatePagerAdapter.
I'll put some of my classes here. Ask if you need more information.
RecyclerViewAdapter.java
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
private List<String> mListTitle;
private List<String> mListDesc;
private List<String> mListPoints;
private List<String> mListDates;
private String fragment_tag;
public RecyclerViewAdapter() {
}
public RecyclerViewAdapter(List<List<String>> super_list, String tag) {
this.mListTitle = super_list.get(0);
this.mListDesc = super_list.get(1);
this.mListPoints = super_list.get(2);
this.mListDates = super_list.get(3);
fragment_tag = tag;
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
return new RecyclerViewHolder(inflater, parent, fragment_tag);
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
holder.mTitleText.setText(mListTitle.get(position));
holder.mDescText.setText(mListDesc.get(position));
holder.mPointsText.setText(mListPoints.get(position));
if (fragment_tag.equals("completed")) {
holder.mDateText.setText(mListDates.get(position));
}
}
#Override
public int getItemCount() {
return mListTitle.size();
}
}
class RecyclerViewHolder extends RecyclerView.ViewHolder {
RecyclerView recyclerView;
RecyclerViewAdapter mAdapter;
public TextView mTitleText, mDescText, mDateText, mPointsText, popupTitle;
public Button mConfButton, popCancelBtn, popAcceptBtn;
public RecyclerViewHolder(View itemView) {
super(itemView);
}
public RecyclerViewHolder(final LayoutInflater inflater, final ViewGroup container, String tag) {
// Inflating the card layout depending on the tag parameter.
super(inflater.inflate
((tag.equals("challenges")) ? R.layout.card_view_chall : R.layout.card_view_comp, container,
false));
mTitleText = itemView.findViewById(R.id.title_holder);
mDescText = itemView.findViewById(R.id.desc_holder);
mPointsText = itemView.findViewById(R.id.points_holder);
mDateText = itemView.findViewById(R.id.date_holder);
if (tag.equals("challenges")) {
mConfButton = itemView.findViewById(R.id.card_conf_button);
mConfButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Setting the layout inflater for popup window.
LayoutInflater pInflater = (LayoutInflater) itemView.getContext().getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup container1 = (ViewGroup) pInflater.inflate(R.layout.confirmation_popup, null);
final PopupWindow popupWindow = new PopupWindow(container1, 700, 600, true);
popupTitle = container1.findViewById(R.id.popuptext);
popAcceptBtn = container1.findViewById(R.id.accept_button);
popCancelBtn = container1.findViewById(R.id.cancel_button);
popupTitle.setText(mTitleText.getText().toString());
// Dismisses the popup window
popCancelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
popupWindow.dismiss();
}
});
// Click listener for dialog accept button.
popAcceptBtn.setOnClickListener(new View.OnClickListener() {
String date;
#Override
public void onClick(View view) {
List<String> list = new ArrayList<>();
list.add(mTitleText.getText().toString());
list.add(mDescText.getText().toString());
list.add(mPointsText.getText().toString());
list.add(date = new SimpleDateFormat("dd-MM-yyyy", Locale.getDefault()).format(new Date()));
// Saving data from current card into the completed challenges list.
TempDataReader reader = new TempDataReader(itemView.getContext());
new TempDataReader(itemView.getContext()).saveFile(list);
// I want to notify the dataset change here if possible!
popupWindow.dismiss();
}
});
popupWindow.showAtLocation(itemView, Gravity.CENTER, 25, 100);
}
});
}
}
}
SectionsPagerAdapter.java
public class SectionsPagerAdapter extends FragmentStatePagerAdapter{
private ViewPager viewPager;
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public void addFragment(Fragment fragment, String title){
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
}
CompletedFragment.java
public class CompletedFragment extends Fragment {
RecyclerView recyclerView;
RecyclerViewAdapter adapter;
public Fragment newInstance() {
return new CompletedFragment();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.completed_fragment, container, false);
recyclerView = view.findViewById(R.id.completed_frag);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
TempDataReader reader = new TempDataReader(getActivity());
List<List<String>> super_list = reader.readCompFile();
if(super_list == null || super_list.size() < 1){
return null;
} else{
adapter = new RecyclerViewAdapter(super_list,"completed");
recyclerView.setAdapter(adapter);
return view;
}
}
}
EDIT:
Added the code for the second fragment, which is the one that should be updated after the onClick at RecyclerViewHolder-class.
You have to add a function in your adapter for adding data:
public void addData(String title, String desc, String point, String date) {
this.mListTitle.add(title);
this.mListDesc.add(desc);
this.mListPoints.add(point);
this.mListDates.add(date);
notifyDataSetChanged();
}
If you want to enable animations call notifyItemInserted() instead of notifyDataSetChanged();
It is important that you add a String to every list because in your onBindViewHolder() you get the item to display from every list with list.get(position). Otherwise you'll get a IndexOutOfBoundsException.
You can create an interface and use as a callback. Send it as a parameter of the RecyclerViewAdapter and then to your RecyclerViewHolder. When the item should be added you call the callback that will get you back to your fragment. There you can read the file again and call notifyDataSetChanged.
I know i explain pretty bad so i will try to change your code so that it does what i said:
this will be your RecyclerViewAdapter:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> {
private List<String> mListTitle;
private List<String> mListDesc;
private List<String> mListPoints;
private List<String> mListDates;
private String fragment_tag;
private Runnable callback;
public RecyclerViewAdapter() {
}
public RecyclerViewAdapter(List<List<String>> super_list, String tag, Runnable callBack) {
//add the callback here(Runnable) and save it into a local variable
this.callback=callback;
this.mListTitle = super_list.get(0);
this.mListDesc = super_list.get(1);
this.mListPoints = super_list.get(2);
this.mListDates = super_list.get(3);
fragment_tag = tag;
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
return new RecyclerViewHolder(inflater, parent, fragment_tag, callback);
//send the callback to your viewHolder
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
holder.mTitleText.setText(mListTitle.get(position));
holder.mDescText.setText(mListDesc.get(position));
holder.mPointsText.setText(mListPoints.get(position));
if (fragment_tag.equals("completed")) {
holder.mDateText.setText(mListDates.get(position));
}
}
#Override
public int getItemCount() {
return mListTitle.size();
}
}
class RecyclerViewHolder extends RecyclerView.ViewHolder {
RecyclerView recyclerView;
RecyclerViewAdapter mAdapter;
public TextView mTitleText, mDescText, mDateText, mPointsText, popupTitle;
public Button mConfButton, popCancelBtn, popAcceptBtn;
public RecyclerViewHolder(View itemView) {
super(itemView);
}
public RecyclerViewHolder(final LayoutInflater inflater, final ViewGroup container, String tag, Runnable callback) {
//ADD the callback to the parameters list here
// Inflating the card layout depending on the tag parameter.
super(inflater.inflate
((tag.equals("challenges")) ? R.layout.card_view_chall : R.layout.card_view_comp, container,
false));
mTitleText = itemView.findViewById(R.id.title_holder);
mDescText = itemView.findViewById(R.id.desc_holder);
mPointsText = itemView.findViewById(R.id.points_holder);
mDateText = itemView.findViewById(R.id.date_holder);
if (tag.equals("challenges")) {
mConfButton = itemView.findViewById(R.id.card_conf_button);
mConfButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Setting the layout inflater for popup window.
LayoutInflater pInflater = (LayoutInflater) itemView.getContext().getSystemService(LAYOUT_INFLATER_SERVICE);
ViewGroup container1 = (ViewGroup) pInflater.inflate(R.layout.confirmation_popup, null);
final PopupWindow popupWindow = new PopupWindow(container1, 700, 600, true);
popupTitle = container1.findViewById(R.id.popuptext);
popAcceptBtn = container1.findViewById(R.id.accept_button);
popCancelBtn = container1.findViewById(R.id.cancel_button);
popupTitle.setText(mTitleText.getText().toString());
// Dismisses the popup window
popCancelBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
popupWindow.dismiss();
}
});
// Click listener for dialog accept button.
popAcceptBtn.setOnClickListener(new View.OnClickListener() {
String date;
#Override
public void onClick(View view) {
List<String> list = new ArrayList<>();
list.add(mTitleText.getText().toString());
list.add(mDescText.getText().toString());
list.add(mPointsText.getText().toString());
list.add(date = new SimpleDateFormat("dd-MM-yyyy", Locale.getDefault()).format(new Date()));
// Saving data from current card into the completed challenges list.
TempDataReader reader = new TempDataReader(itemView.getContext());
new TempDataReader(itemView.getContext()).saveFile(list);
// I want to notify the dataset change here if possible!
//call the callback
callback.run();
popupWindow.dismiss();
}
});
popupWindow.showAtLocation(itemView, Gravity.CENTER, 25, 100);
}
});
}
}
}
And this will be your fragment:
public class CompletedFragment extends Fragment {
RecyclerView recyclerView;
RecyclerViewAdapter adapter;
public Fragment newInstance() {
return new CompletedFragment();
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.completed_fragment, container, false);
recyclerView = view.findViewById(R.id.completed_frag);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
TempDataReader reader = new TempDataReader(getActivity());
List<List<String>> super_list = reader.readCompFile();
if(super_list == null || super_list.size() < 1){
return null;
} else{
adapter = new RecyclerViewAdapter(super_list,"completed", new Runnable() {
#Override
public void run() {
//here read the list again and call notifyDataSetChanged on your recycler
}
});
);
recyclerView.setAdapter(adapter);
return view;
}
}
}
Hope it helps and it works for you. If i did anything wrong, let me know, i can't run the code right now so...
edited, i forgot to add code in the callback
i'm facing an issue i can't seem to resolve and i'd like some help.
My app is composed by an activity containing a fragment. After the user taps on a suggestion, activity's method onSuggestionClicked(String cardId) is called and activity's content is replaced with a new PagerFragment_new.
#Override
public void onSuggestionClicked(String cardId) {
Log.d("activity","ID:\t" + cardId);
PagerFragment_new pagerFragment = PagerFragment_new.getInstance(
Injection.provideMtgDatabase(getApplicationContext()),
activityPresenter.getAllCardExpansionIds(cardId),
this);
ActivityUtils.replaceFragment(getSupportFragmentManager(), pagerFragment, R.id.MTGRecallActivity_container);
}
PagerFragment_new contains a ViewPager to display CardInfoFragment_new
public class PagerFragment_new extends MtgRecallFragment_new implements PagerFragmentContract.View {
private View fragmentView;
private ViewPager viewPager;
private PagerFragmentContract.Presenter presenter;
private ScreenSlidePageAdapter_new adapter;
private MtgDatabase database;
private String[] printingsIds;
private ScreenSlidePageAdapter_new.ActivePresenterListener listener;
public PagerFragment_new() {
//Required empty constructor
}
public static PagerFragment_new getInstance(MtgDatabase database, String[] printingsIds, ScreenSlidePageAdapter_new.ActivePresenterListener listener) {
PagerFragment_new instance = new PagerFragment_new();
instance.setDatabase(database);
instance.setPrintingsIds(printingsIds);
instance.listener = listener;
return instance;
}
//other stuff
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
setRetainInstance(true);
super.onCreate(savedInstanceState);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
setHasOptionsMenu(true);
fragmentView = inflater.inflate(R.layout.fragment_pager, container, false);
viewPager = (ViewPager) fragmentView.findViewById(R.id.PAGERFRAG_VIEWPAGER);
adapter = new ScreenSlidePageAdapter_new(getChildFragmentManager(), printingsIds, database, viewPager);
adapter.setListener(listener);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(1);
return fragmentView;
}
#Override
public void setPresenter(PagerFragmentContract.Presenter presenter) {
this.presenter = presenter;
}
}
The adapter to manage ViewPager's element's is ScreenSlidePageAdapter_new, it is responsible of instantiating CardInfoFragments.
public class ScreenSlidePageAdapter_new extends FragmentStatePagerAdapter {
private String[] printingsIds;
private String firstItemId;
private MtgDatabase database;
public ActivePresenterListener activity;
private ViewPager viewPager;
public ScreenSlidePageAdapter_new(FragmentManager fm, String[] printingsIds, MtgDatabase database, ViewPager viewPager) {
super(fm);
this.printingsIds =printingsIds;
this.database = database;
this.firstItemId = printingsIds[0];
this.viewPager = viewPager;
}
#Override
public Fragment getItem(int position) {
//todo create a bundle with cardId
Bundle bundle = new Bundle();
bundle.putString("CardID", printingsIds[position]);
bundle.putString("FirstItemId", firstItemId);
CardInfoFragment_new cardInfoFragment_new = CardInfoFragment_new.getInstance(viewPager);
cardInfoFragment_new.setArguments(bundle);
CardInfoPresenter cardInfoPresenter = new CardInfoPresenter(cardInfoFragment_new, database);
activity.setActivePresenter(cardInfoPresenter);
return cardInfoFragment_new;
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
}
public void setListener(ActivePresenterListener listener) {
this.activity = listener;
}
#Override
public int getCount() {
return printingsIds.length;
}
public interface ActivePresenterListener {
void setActivePresenter(BasePresenter presenter);
}}
Finally, here's the code of CardInfoFragment:
public class CardInfoFragment_new extends MtgRecallFragment_new
implements CardInfoContract.View,
CardPrintingsAdapter.OnItemClickListener {
private ViewPager viewPager;
public CardInfoContract.Presenter presenter;
private View fragmentView;
private MTGCard mtgCard;
RecyclerView printingsRecyclerView;
CardPrintingsAdapter cardPrintingsAdapter;
private String firstItemId; //the first id
public CardInfoFragment_new() {
//required empty constructor
}
private void setViewPager(ViewPager viewPager) {
this.viewPager = viewPager;
}
public static CardInfoFragment_new getInstance(ViewPager viewPager) {
CardInfoFragment_new cardInfoFragment_new = new CardInfoFragment_new();
cardInfoFragment_new.setViewPager(viewPager);
return cardInfoFragment_new;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
setRetainInstance(true);
presenter.start();
String cardId = getArguments().getString("CardID");
firstItemId = getArguments().getString("FirstItemId");
mtgCard = presenter.getCardData(cardId);
super.onCreate(savedInstanceState);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
fragmentView = inflater.inflate(R.layout.fragment_card_info_new, container, false);
setUpCardInfoView(fragmentView);
return fragmentView;
}
public void setUpCardInfoView(final View view){
//others view set-up action omitted
cardprintingsContainer = (LinearLayout) view.findViewById(R.id.CARDINFO_printingsContainer);
printingsRecyclerView = (RecyclerView)fragmentView.findViewById(R.id.CARDINFO_printings_recyclerView);
final List<String> printings = presenter.getCardPrintings(firstItemId, mtgCard.getName());
if (printings.size() < 40) {
setupPrintings(printings,printingsRecyclerView);
}
else {
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
LinearLayout printingsRow = new LinearLayout(getContext());
printingsRow = (LinearLayout)inflater.inflate(R.layout.card_info_printings_row,printingsRow,true);
printingsRow.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setupPrintings(printings, printingsRecyclerView);
}
});
ImageView printingssetImage = (ImageView)printingsRow.findViewById(R.id.CARDINFO_printingsRow_setImage);
printingssetImage.setVisibility(View.INVISIBLE);
TextView printingssetName = (TextView)printingsRow.findViewById(R.id.CARDINFO_printingsRow_setName);
printingssetName.setText("Click to see all the "+printings.size()+ " versions");
cardprintingsContainer.addView(printingsRow);
}
}
public void setupPrintings(List<String> printings, RecyclerView recyclerView) {
cardPrintingsAdapter =
new CardPrintingsAdapter(getContext(), printings);
cardPrintingsAdapter.setOnItemClickListener(this);
UnscrollableLayoutManager layoutManager = new UnscrollableLayoutManager(getContext(), LinearLayoutManager.VERTICAL, false);
recyclerView.setAdapter(cardPrintingsAdapter);
recyclerView.setLayoutManager(layoutManager);
}
#Override
public void onItemClick(View itemView, int position) {
int i = viewPager.getAdapter().getCount();
viewPager.setCurrentItem(position);
}
#Override
public void onDestroy() {
presenter = null;
mtgCard = null;
super.onDestroy();
}}
When user click on a RecyclerView item, CardInfoFragment's method onItemClick(View itemView, int position) is called and the viewpager is set to current position. Everything as expected.
THE PROBLEM
When the orientation changes, fragments are able to retain their states, but viewPager.setCurrentItem(position) does nothing, and i'm not able to change displayed fragment.
I already checked:
ViewPager instance and adapters instances corresponds to those passed to Fragments
onItemClick is fired
this questions question1 question2
If i use
android:configChanges="orientation|screenSize"
in manifest it works even after config changes, but i don't want to use this option since is discouraged.
Thanks in advance!
By default, when certain key configuration changes happen on Android (a common example is an orientation change), Android fully restarts the running Activity to help it adjust to such changes.
When you define android:configChanges="keyboardHidden|orientation" in your AndroidManifest, you are telling Android: "Please don't do the default reset when the keyboard is pulled out, or the phone is rotated; I want to handle this myself. Yes, I know what I'm doing".
So use configChanges.
The use of this is discouraged, IF you don't know how to use it. But for a case like this, I would suggest you use it. IF not, still the activity will be recreated. which just takes time, resources, and I don't see why you would want that to happen.