混淆Firestore NullPointerException或android.view.view android.view.view.findViewById（int）空对象引用
我的应用程序中有一个问答系统。我可以看到我的问题，如果我愿意，我可以回答我的问题。一切正常，但当我“将我的问题标记为已回答”时，我得到一个空点异常。当我再次运行应用程序时，firestore和我的应用程序中的一切都正常，就像我没有空点异常一样。我不知道这是和firestore有关，还是别的什么 Logcat指出了这一点：混淆Firestore NullPointerException或android.view.view android.view.view.findViewById（int）空对象引用,android,nullpointerexception,google-cloud-firestore,Android,Nullpointerexception,Google Cloud Firestore,我的应用程序中有一个问答系统。我可以看到我的问题，如果我愿意，我可以回答我的问题。一切正常，但当我“将我的问题标记为已回答”时，我得到一个空点异常。当我再次运行应用程序时，firestore和我的应用程序中的一切都正常，就像我没有空点异常一样。我不知道这是和firestore有关，还是别的什么 Logcat指出了这一点： private void getQuestions() { Objects.requireNonNull( getView() ).findViewById(R.id
private void getQuestions() {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.GONE);
refreshLayout.setRefreshing(true);
Query firstQuery = mFirestore.collection("Questions")
.orderBy("timestamp", Query.Direction.DESCENDING);
firstQuery.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if (!documentSnapshots.isEmpty()) {
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
if (!Objects.equals( doc.getDocument().getString( "id" ), mCurrentUser.getUid() )) {
AllQuestionsModel question = doc.getDocument().toObject(AllQuestionsModel.class).withId(doc.getDocument().getId());
allQuestionsModelList.add(question);
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
}
}
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} else {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
}
});
}
public class AllQuestionsFragment extends Fragment {
private RecyclerView recyclerView;
private Context context;
private FirebaseFirestore mFirestore;
private FirebaseUser mCurrentUser;
private QuestionAdapter adapter;
private static String TAG= AllQuestionsFragment.class.getSimpleName();
private List<AllQuestionsModel> allQuestionsModelList =new ArrayList<>();
private TextView et0,et1,et2,et3,et4,et5,et6,et7,et8,et9,et10,et11,et12,et13;
private SwipeRefreshLayout refreshLayout;
public AllQuestionsFragment() {
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(getActivity().getSharedPreferences("theme",MODE_PRIVATE).getBoolean("dark",false))
return inflater.inflate( R.layout.social_frag_answered_dark, container, false);
else
return inflater.inflate(R.layout.social_frag_answered_dark, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
context = view.getContext();
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
if (mCurrentUser != null) {
et0=view.findViewById(R.id.all);
et1=view.findViewById(R.id.accountancy);
et2=view.findViewById(R.id.astronomy);
et3=view.findViewById(R.id.biology);
et4=view.findViewById(R.id.business_maths);
et5=view.findViewById(R.id.computer_science);
et6=view.findViewById(R.id.commerce);
et7=view.findViewById(R.id.chemistry);
et8=view.findViewById(R.id.economics);
et9=view.findViewById(R.id.geography);
et10=view.findViewById(R.id.history);
et11=view.findViewById(R.id.physics);
et12=view.findViewById(R.id.p_science);
et13=view.findViewById(R.id.maths);
mFirestore = FirebaseFirestore.getInstance();
adapter = new QuestionAdapter(allQuestionsModelList);
refreshLayout=view.findViewById(R.id.refreshLayout);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.VERTICAL));
recyclerView.setItemAnimator(new DefaultItemAnimator());
allQuestionsModelList.clear();
recyclerView.setAdapter(adapter);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
}
});
setUpOnClick();
getQuestions();
}
}
private void getQuestions() {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.GONE);
refreshLayout.setRefreshing(true);
Query firstQuery = mFirestore.collection("Questions")
.orderBy("timestamp", Query.Direction.DESCENDING);
firstQuery.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if (!documentSnapshots.isEmpty()) {
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
if (!Objects.equals( doc.getDocument().getString( "id" ), mCurrentUser.getUid() )) {
AllQuestionsModel question = doc.getDocument().toObject(AllQuestionsModel.class).withId(doc.getDocument().getId());
allQuestionsModelList.add(question);
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
}
}
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} else {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
}
});
}
@Override
public void onResume() {
super.onResume();
adapter.notifyDataSetChanged();
}
public void filterResult(String subject){
if(subject.equals("All")){
getQuestions();
}else{
refreshLayout.setRefreshing(true);
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.GONE);
Query firstQuery = mFirestore.collection("Questions")
.whereEqualTo("subject",subject)
.orderBy("timestamp", Query.Direction.DESCENDING);
firstQuery.addSnapshotListener(getActivity(), new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
try {
if (!documentSnapshots.isEmpty()) {
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
if (!doc.getDocument().getString("id").equals(mCurrentUser.getUid())) {
AllQuestionsModel question = doc.getDocument().toObject(AllQuestionsModel.class).withId(doc.getDocument().getId());
allQuestionsModelList.add(question);
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
}
}
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} else {
getView().findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
}catch (NullPointerException eee){
Toasty.error(context, "Some technical error occurred", Toasty.LENGTH_SHORT,true).show();
adapter.notifyDataSetChanged();
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} catch (Exception ee){
ee.printStackTrace();
Toasty.error(context, "Some technical error occurred", Toasty.LENGTH_SHORT, true).show();
if(allQuestionsModelList.isEmpty()){
refreshLayout.setRefreshing(false);
getView().findViewById(R.id.default_item).setVisibility(View.VISIBLE);
}
}
}
});
}
}
public void setUpOnClick(){
et0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
}
});
}
});
et1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Accountancy");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Accountancy");
}
});
}
});
et2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Astronomy");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Astronomy");
}
});
}
});
et3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Biology");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Biology");
}
});
}
});
et4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Business Maths");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Business Maths");
}
});
}
});
et5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Computer Science");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Computer Science");
}
});
}
});
et6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Commerce");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Commerce");
}
});
}
});
et7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Chemistry");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Chemistry");
}
});
}
});
et8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Economics");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Economics");
}
});
}
});
et9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Geography");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Geography");
}
});
}
});
et10.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("History");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("History");
}
});
}
});
et11.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Physics");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Physics");
}
});
}
});
et12.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Political Science");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Political Science");
}
});
}
});
et13.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Maths");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Maths");
}
});
}
});
}
公共类AllQuestionsFragment扩展片段{
私人回收站；
私人语境；
私人FirebaseFirestore mFirestore；
私有FirebaseUser mCurrentUser；
专用适配器；
私有静态字符串标记=AllQuestionsFragment.class.getSimpleName（）；
私有列表allQuestionsModelList=new ArrayList（）；
私人文本视图et0、et1、et2、et3、et4、et5、et6、et7、et8、et9、et10、et11、et12、et13；
私人交换机布局刷新布局；
公共所有问题片段（）{
}
@凌驾
创建视图时的公共视图（@NonNull LayoutInflater inflater、ViewGroup容器、Bundle savedInstanceState）{
if（getActivity（）.getSharedReferences（“主题”，模式\私有）.getBoolean（“暗，假））
返回充气机。充气（R.layout.social\u frag\u黑色，容器，假）；
其他的
返回充气机。充气（R.layout.social\u frag\u黑色，容器，假）；
}
@凌驾
已创建公用void onview（@NonNull视图，@Nullable Bundle savedInstanceState）{
super.onViewCreated（视图，savedInstanceState）；
context=view.getContext（）；
mCurrentUser=FirebaseAuth.getInstance（）.getCurrentUser（）；
if（mCurrentUser！=null）{
et0=view.findViewById（R.id.all）；
et1=view.findViewById（R.id.会计）；
et2=view.findviewbyd（R.id.天文学）；
et3=view.findViewById（R.id.biology）；
et4=view.findViewById（R.id.business\u math）；
et5=view.findviewbyd（R.id.computer\u science）；
et6=view.findviewbyd（R.id.commerce）；
et7=view.findViewById（R.id.chemistry）；
et8=view.findViewById（R.id.economics）；
et9=view.findViewById（R.id.geography）；
et10=view.findViewById（R.id.history）；
et11=view.findViewById（R.id.physics）；
et12=view.findviewbyd（R.id.p_science）；
et13=view.findViewById（R.id.math）；
mFirestore=FirebaseFirestore.getInstance（）；
适配器=新问题适配器（allQuestionsModelList）；
refreshLayout=view.findViewById（R.id.refreshLayout）；
recyclerView=view.findViewById（R.id.recyclerView）；
setLayoutManager（新的LinearLayoutManager（上下文））；
添加装饰（新的DividerItemDecoration（context，DividerItemDecoration.VERTICAL））；
setItemAnimator（新的DefaultItemAnimator（））；
allQuestionsModelList.clear（）；
recyclerView.setAdapter（适配器）；
refreshLayout.setOnRefreshListener（新的SwipeRefreshLayout.OnRefreshListener（）{
@凌驾
公共void onRefresh（）{
allQuestionsModelList.clear（）；
adapter.notifyDataSetChanged（）；
获取问题（）；
}
});
setUpOnClick（）；
获取问题（）；
}
}
私人问题{
Objects.requireNonNull（getView（））.findViewById（R.id.default\u项）.setVisibility（View.GONE）；
refreshLayout.setRefreshing（true）；
Query firstQuery=mFirestore.collection（“问题”）
.orderBy（“时间戳”，Query.Direction.DESCENDING）；
addSnapshotListener（新的EventListener（）{
@凌驾
public void OneEvent（QuerySnapshot文档快照，FireBaseFireStore异常e）{
如果（！documentSnapshots.isEmpty（））{
对于（DocumentChange文档：documentSnapshots.getDocumentChanges（））{
if（doc.getType（）==DocumentChange.Type.ADDED）{
如果（！Objects.equals（doc.getDocument（）.getString（“id”），mCurrentUser.getUid（））{
AllQuestionsModel question=doc.getDocument（）.toObject（AllQuestionsModel.class）.withId（doc.getDocument（）.getId（））；
allQuestionsModelList.add（问题）；
adapter.notifyDataSetChanged（）；
refreshLayout.setRefreshing（false）；
}
}
}
if（allQuestionsModelList.isEmpty（））{
Objects.requireNonNull（getView（））.findViewById（R.id.default\u项）.setVisibility（View.VISIBLE）；
refreshLayout.setRefreshing（false）；
}
}否则{
Objects.requireNonNull（getView（））.findViewById（R.id.default\u项）.setVisibility（View.VISIBLE）；
refreshLayout.setRefreshing（false）；
}
}
});
}
@凌驾
恢复时公开作废（）{
super.onResume（）；
adapter.notifyDataSetChanged（）；
}
public void filterResult（字符串主题）{
如果（主体等于（“全部”））{
获取问题（）；
}否则{
refreshLayout.setRefreshing（true）；
Objects.requireNonNull（getView（））.findViewById（R.id.default\u项）.setVisibility（View.GONE）；
Query firstQuery=mFirestore.collection（“问题”）
.whereEqualTo（“主体”，主体）
.orderBy（“时间戳”，Query.Direction.DESCENDING）；
firstQuery.addSnapshotListener（getActivity（），new EventListener（））{
@凌驾
public void OneEvent（QuerySnapshot文档快照，FireBaseFireStore异常e）{
试一试{
如果（！documentSnapshots.isEmpty（））{
对于（DocumentChange文档：documentSnapshots.getDocumentChanges（））{
public class AllQuestionsFragment extends Fragment {
private RecyclerView recyclerView;
private Context context;
private FirebaseFirestore mFirestore;
private FirebaseUser mCurrentUser;
private QuestionAdapter adapter;
private static String TAG= AllQuestionsFragment.class.getSimpleName();
private List<AllQuestionsModel> allQuestionsModelList =new ArrayList<>();
private TextView et0,et1,et2,et3,et4,et5,et6,et7,et8,et9,et10,et11,et12,et13;
private SwipeRefreshLayout refreshLayout;
public AllQuestionsFragment() {
}
@Override
public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if(getActivity().getSharedPreferences("theme",MODE_PRIVATE).getBoolean("dark",false))
return inflater.inflate( R.layout.social_frag_answered_dark, container, false);
else
return inflater.inflate(R.layout.social_frag_answered_dark, container, false);
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
context = view.getContext();
mCurrentUser = FirebaseAuth.getInstance().getCurrentUser();
if (mCurrentUser != null) {
et0=view.findViewById(R.id.all);
et1=view.findViewById(R.id.accountancy);
et2=view.findViewById(R.id.astronomy);
et3=view.findViewById(R.id.biology);
et4=view.findViewById(R.id.business_maths);
et5=view.findViewById(R.id.computer_science);
et6=view.findViewById(R.id.commerce);
et7=view.findViewById(R.id.chemistry);
et8=view.findViewById(R.id.economics);
et9=view.findViewById(R.id.geography);
et10=view.findViewById(R.id.history);
et11=view.findViewById(R.id.physics);
et12=view.findViewById(R.id.p_science);
et13=view.findViewById(R.id.maths);
mFirestore = FirebaseFirestore.getInstance();
adapter = new QuestionAdapter(allQuestionsModelList);
refreshLayout=view.findViewById(R.id.refreshLayout);
recyclerView = view.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.addItemDecoration(new DividerItemDecoration(context, DividerItemDecoration.VERTICAL));
recyclerView.setItemAnimator(new DefaultItemAnimator());
allQuestionsModelList.clear();
recyclerView.setAdapter(adapter);
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
}
});
setUpOnClick();
getQuestions();
}
}
private void getQuestions() {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.GONE);
refreshLayout.setRefreshing(true);
Query firstQuery = mFirestore.collection("Questions")
.orderBy("timestamp", Query.Direction.DESCENDING);
firstQuery.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if (!documentSnapshots.isEmpty()) {
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
if (!Objects.equals( doc.getDocument().getString( "id" ), mCurrentUser.getUid() )) {
AllQuestionsModel question = doc.getDocument().toObject(AllQuestionsModel.class).withId(doc.getDocument().getId());
allQuestionsModelList.add(question);
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
}
}
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} else {
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
}
});
}
@Override
public void onResume() {
super.onResume();
adapter.notifyDataSetChanged();
}
public void filterResult(String subject){
if(subject.equals("All")){
getQuestions();
}else{
refreshLayout.setRefreshing(true);
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.GONE);
Query firstQuery = mFirestore.collection("Questions")
.whereEqualTo("subject",subject)
.orderBy("timestamp", Query.Direction.DESCENDING);
firstQuery.addSnapshotListener(getActivity(), new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
try {
if (!documentSnapshots.isEmpty()) {
for (DocumentChange doc : documentSnapshots.getDocumentChanges()) {
if (doc.getType() == DocumentChange.Type.ADDED) {
if (!doc.getDocument().getString("id").equals(mCurrentUser.getUid())) {
AllQuestionsModel question = doc.getDocument().toObject(AllQuestionsModel.class).withId(doc.getDocument().getId());
allQuestionsModelList.add(question);
adapter.notifyDataSetChanged();
refreshLayout.setRefreshing(false);
}
}
}
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} else {
getView().findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
}catch (NullPointerException eee){
Toasty.error(context, "Some technical error occurred", Toasty.LENGTH_SHORT,true).show();
adapter.notifyDataSetChanged();
if(allQuestionsModelList.isEmpty()){
Objects.requireNonNull( getView() ).findViewById(R.id.default_item).setVisibility(View.VISIBLE);
refreshLayout.setRefreshing(false);
}
} catch (Exception ee){
ee.printStackTrace();
Toasty.error(context, "Some technical error occurred", Toasty.LENGTH_SHORT, true).show();
if(allQuestionsModelList.isEmpty()){
refreshLayout.setRefreshing(false);
getView().findViewById(R.id.default_item).setVisibility(View.VISIBLE);
}
}
}
});
}
}
public void setUpOnClick(){
et0.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
getQuestions();
}
});
}
});
et1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Accountancy");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Accountancy");
}
});
}
});
et2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Astronomy");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Astronomy");
}
});
}
});
et3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Biology");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Biology");
}
});
}
});
et4.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Business Maths");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Business Maths");
}
});
}
});
et5.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Computer Science");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Computer Science");
}
});
}
});
et6.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Commerce");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Commerce");
}
});
}
});
et7.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Chemistry");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Chemistry");
}
});
}
});
et8.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Economics");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Economics");
}
});
}
});
et9.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Geography");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Geography");
}
});
}
});
et10.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("History");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("History");
}
});
}
});
et11.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Physics");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Physics");
}
});
}
});
et12.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Political Science");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Political Science");
}
});
}
});
et13.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Maths");
refreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
allQuestionsModelList.clear();
adapter.notifyDataSetChanged();
filterResult("Maths");
}
});
}
});
}
public class AllQuestionsFragment extends Fragment {
LinearLayout viewLayout;
....
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
viewLayout = view.findViewById(R.id.default_item);
....
}
}
private void getQuestions() {
viewLayout.setVisibility(View.GONE);
....
}