[英]How to retrieve multiple data from firebase and display it in text views?
我想在應用程序的片段中顯示用戶信息,我需要從 firebase 檢索數據。我還創建了一個單獨的 UserInformation java 類來檢索數據。
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;
}
}
下面是我在其中使用了 addEventListener 的 java 代碼。 請告訴我如何提取數據並將其顯示在文本視圖中。
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
}
}
通過這種方式,您可以在使用for (DataSnapshot ds : dataSnapshot.getChildren()){
在子sarah
內部迭代后單獨檢索每個值
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