在explore_fragment中getValue(User.class)显示错误。我的explore_fragment是:
public class exploreFragment extends Fragment {
FragmentExploreBinding binding;
ArrayList<User> list = new ArrayList<>();
FirebaseAuth auth;
FirebaseDatabase database;
public exploreFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
auth = FirebaseAuth.getInstance();
database= FirebaseDatabase.getInstance();
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
binding= FragmentExploreBinding.inflate(inflater, container, false);
UserAdapter adapter = new UserAdapter(getContext(),list);
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
binding.usersRV.setLayoutManager(layoutManager);
binding.usersRV.setAdapter(adapter);
database.getReference().child("Users").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
list.clear();
for(DataSnapshot dataSnapshot : snapshot.getChildren()){
User user = dataSnapshot.getValue(User.class);
user.setUserID(dataSnapshot.getKey());
if(!dataSnapshot.getKey().equals(FirebaseAuth.getInstance().getUid())){
list.add(user);
}
}
adapter.notifyDataSetChanged();
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
return binding.getRoot();
}
}
User_model是:
public class User {
private String name, profession,email,password,cname;
private String profile;
private String userReff;
private int guidedCount;
private String userID;
private String coverPhoto;
public User() {
}
public int getGuidedCount() {
return guidedCount;
}
public void setGuidedCount(int guidedCount) {
this.guidedCount = guidedCount;
}
public String getCoverPhoto() {
return coverPhoto;
}
public void setCoverPhoto(String coverPhoto) {
this.coverPhoto = coverPhoto;
}
public User(String name, String profession, String email, String password, String cname) {
this.name = name;
this.profession = profession;
this.email = email;
this.password = password;
this.cname = cname;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getProfession() {
return profession;
}
public void setProfession(String profession) {
this.profession = profession;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public String getProfile() {
return profile;
}
public void setProfile(String profile) {
this.profile = profile;
}
public String getUserReff() {
return userReff;
}
public void setUserReff(String userReff) {
this.userReff = userReff;
}
public String getUserID() {
return userID;
}
public void setUserID(String userID) {
this.userID = userID;
}
}
User_adapter是:
public class UserAdapter extends RecyclerView.Adapter<UserAdapter.viewHolder>{
Context context;
ArrayList<User> list;
public UserAdapter(Context context, ArrayList<User> list) {
this.context = context;
this.list = list;
}
@NonNull
@Override
public viewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.user_sample,parent,false);
return new viewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull viewHolder holder, int position) {
User user = list.get(position);
Picasso.get().load(user.getProfile()).placeholder(R.drawable.placeholder).into(holder.binding.profileImage);
holder.binding.name.setText(user.getName());
holder.binding.profession.setText(user.getProfession());
holder.binding.viewprofilebtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view){
String visiter = list.get(holder.getAdapterPosition()).getUserID();
Intent intent= new Intent(context, VActivity.class);
intent.putExtra("usersid",visiter).toString();
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
}
@Override
public int getItemCount() {
return list.size();
}
public class viewHolder extends RecyclerView.ViewHolder{
UserSampleBinding binding;
public viewHolder(@NonNull View itemView) {
super(itemView);
binding = UserSampleBinding.bind(itemView);
}
}
}
错误是:
E/AndroidRuntime: FATAL EXCEPTION: maincom . example。过程:guided_app, PID: 2744database. databaseexception:将java.lang.String类型的值转换为int类型失败com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertInteger (CustomClassMapper.java: 364)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToPrimitive (CustomClassMapper.java: 290)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass (CustomClassMapper.java: 215)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToType (CustomClassMapper.java: 179)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.access 100美元(CustomClassMapper.java: 48)com.google.firebase.database.core.utilities.encoding.CustomClassMapper BeanMapper.deserialize美元(CustomClassMapper.java: 593)com.google.firebase.database.core.utilities.encoding.CustomClassMapper BeanMapper.deserialize美元(CustomClassMapper.java: 563)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertBean (CustomClassMapper.java: 433)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.deserializeToClass (CustomClassMapper.java: 232)com.google.firebase.database.core.utilities.encoding.CustomClassMapper.convertToCustomClass (CustomClassMapper.java: 80)com.google.firebase.database.DataSnapshot.getValue (DataSnapshot.java: 203)com.example.guided_app.fragment.exploreFragment ondatachange 1.美元(exploreFragment.java: 60)com.google.firebase.database.core.ValueEventRegistration.fireEvent (ValueEventRegistration.java: 75)com.google.firebase.database.core.view.DataEvent.fire (DataEvent.java: 63)在com.google.firebase.database.core.view.EventRaiser 1.美元运行(EventRaiser.java: 55)android.os.Handler.handleCallback (Handler.java: 790)android.os.Handler.dispatchMessage (Handler.java: 99)android.os.Looper.loop (Looper.java: 164)android.app.ActivityThread.main (ActivityThread.java: 6494)在java.lang.reflect.Method。调用(本地方法)com.android.internal.os.RuntimeInit MethodAndArgsCaller.run美元(RuntimeInit.java: 438)com.android.internal.os.ZygoteInit.main (ZygoteInit.java: 807)
firebase数据库是:
"Users": {
"59fLuGGNugPcgp6b725cFnKIzKC2": {
"cname": "LIT",
"email": "Stephen@gmail.com",
"guidedCount": 0,
"name": "Stephen Wade",
"password": "123456",
"profession": "Developer @ Adobe"
},
"7kpNGqcHeBfNqf8GrVK2Hpew0L62": {
"cname": "BIT",
"email": "anshul@gmail.com",
"guided": {
"FOQEVbKRpNYjfzAJCp1XQtnvRlh2": {
"guidedAt": 1670152487063,
"guidedBy": "FOQEVbKRpNYjfzAJCp1XQtnvRlh2"
},
"y3pV1GhdLqOnteMO64U2F4o8mMu2": {
"guidedAt": 1670151228825,
"guidedBy": "y3pV1GhdLqOnteMO64U2F4o8mMu2"
}
},
"guidedCount": 2,
"name": "Anshul Lanjewar",
"password": "123456",
"profession": "SDE @ Google"
},
"FOQEVbKRpNYjfzAJCp1XQtnvRlh2": {
"cname": "SIT",
"email": "Tanvi@gmail.com",
"guidedCount": 0,
"name": "Tanvi Colson",
"password": "123456",
"profession": "Analyst @ Google"
},
"Jj2RH3iopgdLU6AC3VKeeaMKAXx1": {
"cname": "PIT",
"email": "Shana@gmail.com",
"guidedCount": 0,
"name": "Shana Sharma",
"password": "123456",
"profession": "FullStack @ Netflix"
},
"gAzcrP1IYmQI0ht4qfH9WGt9U7F2": {
"cname": "MIT",
"email": "John@gmail.com",
"guided": {
"7kpNGqcHeBfNqf8GrVK2Hpew0L62": {
"guidedAt": 1670614050015,
"guidedBy": "7kpNGqcHeBfNqf8GrVK2Hpew0L62"
}
},
"guidedCount": "gAzcrP1IYmQI0ht4qfH9WGt9U7F2",
"name": "John Adams",
"password": "123456",
"profession": "Developer @ Apple"
},
"y3pV1GhdLqOnteMO64U2F4o8mMu2": {
"cname": "BIT",
"email": "kumar@gmail.com",
"guided": {
"7kpNGqcHeBfNqf8GrVK2Hpew0L62": {
"guidedAt": 1670154254299,
"guidedBy": "7kpNGqcHeBfNqf8GrVK2Hpew0L62"
}
},
"guidedCount": 1,
"name": "Kumar Mishra",
"password": "123456",
"profession": "SDE @ Microsoft"
}
}
我最近开始与android开发，所以只是卡住了。我想创建一个explore_fragment，其中用户列表添加在recyclerView和view_profile按钮，我们可以查看用户配置文件。
如预期，出现以下错误:
com.google.firebase.database。将java.lang.String类型的值转换为int
失败
到达的原因是int类型字段包含String类型的值。因此，在反序列化时，guidedCount字段应该保存int类型的值，而不是String类型的值，因此会出现错误。负责异常的节点是:
"guidedCount": "gAzcrP1IYmQI0ht4qfH9WGt9U7F2",
看，它保存一个UID而不是一个数字。要解决这个问题，把UID改成一个数字。