[英]How to retrieve multiple data from firebase and display it in text views?
I want to display user information inside a fragment in app for which i need to retrieve data from firebase.I have also created a seperate UserInformation java class to retrieve data.我想在应用程序的片段中显示用户信息,我需要从 firebase 检索数据。我还创建了一个单独的 UserInformation java 类来检索数据。
public class UserInformation {
private String username;
private String email;
private String password;
private String phoneno;
private String carplateno;
public UserInformation() {
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
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 getPhoneno() {
return phoneno;
}
public void setPhoneno(String phoneno) {
this.phoneno = phoneno;
}
public String getCarplateno() {
return carplateno;
}
public void setCarplateno(String carplateno) {
this.carplateno = carplateno;
}
}
Below is my java code in which i have used addEventListener.下面是我在其中使用了 addEventListener 的 java 代码。 Kindly tell me how can i extract data and display it in textviews.请告诉我如何提取数据并将其显示在文本视图中。
public class MyProfile extends Fragment {
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View v= inflater.inflate(R.layout.my_profile, null);
final TextView t1=(TextView) v.findViewById(R.id.Usernametv);
final TextView t2=(TextView) v.findViewById(R.id.EmailIdtv);
final TextView t3=(TextView) v.findViewById(R.id.Passwordtv);
final TextView t4=(TextView) v.findViewById(R.id.MobileNumbertv );
final TextView t5=(TextView) v.findViewById(R.id.CarPlatetv);
final FirebaseDatabase database = FirebaseDatabase.getInstance();
final DatabaseReference table_user = database.getReference("User");
table_user.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()){
UserInformation uinfo = new UserInformation();
}
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
return v;
}
}
final DatabaseReference table_user = database.getReference("User");
table_user.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()){
String plate = ds.child("carPlateNo").getValue().toString();
String email = ds.child("email").getValue().toString();
//etc
}
}
This way you retrieve each value alone, after iterating inside child sarah
using for (DataSnapshot ds : dataSnapshot.getChildren()){
通过这种方式,您可以在使用for (DataSnapshot ds : dataSnapshot.getChildren()){
在子sarah
内部迭代后单独检索每个值
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