0
ここで私のコードに問題がありますが、recyclerviewはデータを表示していません。私はすべての依存関係を実装しているフラグメント内のリサイクラビューを持つFirebaseデータベース
public class Contact {
private String contactProfession, contactName, contactAddress;
private int contactNumber, contactStatus;
public Contact(){
}
public String getContactProfession(){
return contactProfession;
}
public void setContactProfession(String contactProfession){
this.contactProfession = contactProfession;
}
public String getContactName(){
return contactName;
}
public void setContactName(String contactName){
this.contactName = contactName;
}
public String getContactAddress(){
return contactAddress;
}
public void setContactAddress(String contactAddress){
this.contactAddress = contactAddress;
}
public int getContactNumber(){
return contactNumber;
}
public void setContactNumber(int contactNumber){
this.contactNumber = contactNumber;
}
public int getContactStatus(){
return contactStatus;
}
public void setContactStatus(int contactStatus){
this.contactStatus = contactStatus;
}
}
はここに私のアダプタここ
public class AdapterContact extends RecyclerView.Adapter<AdapterContact.MyViewHolder> {
Context context;
ArrayList<Contact> contacts;
public static class MyViewHolder extends RecyclerView.ViewHolder {
public CardView mCardView1;
public TextView mTextView1,mTextView2,mTextView3,mTextView4;
public MyViewHolder(View v) {
super(v);
mCardView1 = (CardView) v.findViewById(R.layout.item_contact);
mTextView1 = (TextView) v.findViewById(R.id.contact_profession);
mTextView2 = (TextView) v.findViewById(R.id.contact_name);
mTextView3 = (TextView) v.findViewById(R.id.contact_address);
mTextView4 = (TextView) v.findViewById(R.id.contact_number);
}
}
public AdapterContact(Context context,ArrayList<Contact> contacts) {
this.contacts = contacts;
this.context = context;
}
@Override
public AdapterContact.MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_contact, parent, false);
// set the view's size, margins, paddings and layout parameters
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.mTextView1.setText(contacts.get(position).getContactProfession());
holder.mTextView2.setText(contacts.get(position).getContactName());
holder.mTextView3.setText(contacts.get(position).getContactAddress());
holder.mTextView4.setText(contacts.get(position).getContactNumber());
int x = contacts.get(position).getContactStatus();
}
@Override
public int getItemCount() {
return this.contacts.size();
}
}
私のModelクラスでここに私の断片クラス
public class Fragment extends android.support.v4.app.Fragment {
String title, url;
RecyclerView recyclerView;
int ARG_SECTION_NUMBER;
AdapterContact adapterContact;
AlertDialog.Builder dialogBuilder;
AlertDialog b;
Context context;
EditText edt1,edt2,edt3,edt4;
FloatingActionButton floatingActionButton;
static String DB_URL = "https://banda-virasat-6812b.firebaseio.com/";
int status = 0;
ArrayList<Contact> contacts = new ArrayList<>();
private DatabaseReference databaseReference;
FirebaseDatabase mFirebaseDatabase;
Firebase firebase;
public Fragment() {
}
public static Fragment newInstance(String title, String DB_URL){
Fragment fragment1 = new Fragment();
Bundle args = new Bundle();
args.putString("title", title);
fragment1.setArguments(args);
//args.putParcelableArrayList("contact", contacts);
//fragment1.setArguments(args);
return fragment1;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//contacts = getArguments().getParcelableArrayList("contact");
mFirebaseDatabase = FirebaseDatabase.getInstance();
DB_URL = String.valueOf(mFirebaseDatabase.getReference().child("Contact"));
}
public void saveOnline(String contactProfession, String contactName, String contactAddress, int contactNumber, int contactStatus){
Contact contact = new Contact();
contact.setContactProfession(contactProfession);
contact.setContactName(contactName);
contact.setContactAddress(contactAddress);
contact.setContactNumber(contactNumber);
contact.setContactStatus(contactStatus);
firebase.child("Contact").push().setValue(contact);
}
public void refreshData(){
firebase.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
getUpdates(dataSnapshot);
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
getUpdates(dataSnapshot);
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
Log.w(TAG, "Failed to read value.", firebaseError.toException());
}
});
}
private void getUpdates(DataSnapshot dataSnapshot) {
contacts.clear();
for (DataSnapshot dataSnapshot1 : dataSnapshot.getChildren()) {
Contact contact = new Contact();
contact.setContactProfession(dataSnapshot1.getValue(Contact.class).getContactProfession());
contact.setContactName(dataSnapshot1.getValue(Contact.class).getContactName());
contact.setContactAddress(dataSnapshot1.getValue(Contact.class).getContactAddress());
contact.setContactNumber(dataSnapshot1.getValue(Contact.class).getContactNumber());
contact.setContactStatus(dataSnapshot1.getValue(Contact.class).getContactStatus());
contacts.add(contact);
}
System.out.println(contacts.size());
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_main, container, false);
title = getArguments().getString("title");
databaseReference = FirebaseDatabase.getInstance().getReference();
floatingActionButton = (FloatingActionButton)view.findViewById(R.id.fab);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
dialogBuilder = new AlertDialog.Builder(getContext());
final View dialogView = LayoutInflater.from(getContext()).inflate(R.layout.dialog_contact, null);
edt1 = (EditText) dialogView.findViewById(R.id.edit1);
edt2 = (EditText) dialogView.findViewById(R.id.edit2);
edt3 = (EditText) dialogView.findViewById(R.id.edit3);
edt4 = (EditText) dialogView.findViewById(R.id.edit4);
dialogBuilder.setTitle("Add Contact");
dialogBuilder.setOnDismissListener(null);
dialogBuilder.setIcon(R.drawable.contact_not_selected);
dialogBuilder.setMessage("Note: Contacts will only show if approved by admin");
dialogBuilder.setPositiveButton("Add", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//do something with edt.getText().toString();
if(edt1.length() != 0 && edt2.length() !=0 && edt3.length() != 0 && edt4.length() != 0){
System.out.println(edt1.getText().toString());
saveOnline(edt1.getText().toString(),edt2.getText().toString(),edt3.getText().toString(), status, status);
edt1.setText("");
edt2.setText("");
edt3.setText("");
edt4.setText("");
Toast.makeText(getContext(),"Your request has been submitted, pending for approval", 1).show();
}
else{
Toast.makeText(getContext(),"Fill all fields", 1).show();
}
}
});
dialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
//pass
}
});
dialogBuilder.setView(dialogView);
b = dialogBuilder.create();
b.show();
}
});
//dummy = (TextView) view.findViewById(R.id.dummy);
//dummy.setText(title);
recyclerView = (RecyclerView)view.findViewById(R.id.recycler);
recyclerView.setHasFixedSize(true);
context = getContext();
if (getArguments() != null && getArguments().containsKey("title")) {
if(title.equalsIgnoreCase("contact")) {
adapterContact = new AdapterContact(context,contacts);
recyclerView.setAdapter(adapterContact);
}
else if (title.equalsIgnoreCase("news")) {
AdapterNews adapter2 = new AdapterNews(new String[]{"Monkey", "Lion", "Tiger", "Chimp", "Cat", "Cat", "Dog"});
recyclerView.setAdapter(adapter2);
}
else if (title.equalsIgnoreCase("travel")) {
AdapterTravel adapter3 = new AdapterTravel(new String[]{"", ""});
recyclerView.setAdapter(adapter3);
}
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(llm);
return view;
}
/*@Override
public void onStart() {
super.onStart();
if(adapterContact == null){
//TODO make network call
}
else{
//recyclerView.setAdapter(adapterContact);
}*/
return view;
}
@Override
public void onStart() {
super.onStart();
Firebase.setAndroidContext(getContext());
firebase = new Firebase(DB_URL);
if(contacts != null){
}
else {
refreshData();
}
if(title.equalsIgnoreCase("contact")){
floatingActionButton.setVisibility(View.VISIBLE);
}
else {
floatingActionButton.setVisibility(View.GONE);
}
}
}
であるContact.java &許可（インターネット）。 Recyclerviewは入力されていません。
あなたの '' 'refreshData''は、' '' if（contacts！= null）{'' 'のために決して呼び出されません。あなたが初期化されているので、連絡先は決して '' 'ヌル' 'になりません。 – danypata
私はこれを実行しました。でもfirebaseからデータを取得していますが、アダプタはnullなので、データを表示していません。 –
@danypata getUpdates（）ではcontacts.size（）は5になり、アダプタがアタッチされるとContacts.size（）= 0となります –