retrieve data from firebase using getUid() in a alertDialog box

[Bhavya Panchotia]

Want to retrieve username and its contact number from the firebase database. I tried doing it but in the logcat it throws an Null Pointer Exception.

Android Studio Logcat:

Process: com.example.bhavya.epark, PID: 27351 java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.example.bhavya.epark.userreg.getName()' on a null object reference at com.example.bhavya.epark.MapSelect$1$1.onDataChange(MapSelect.java:51) at com.google.firebase.database.obfuscated.zzap.zza(com.google.firebase:firebase-database@@16.0.3:75) at com.google.firebase.database.obfuscated.zzca.zza(com.google.firebase:firebase-database@@16.0.3:63) at com.google.firebase.database.obfuscated.zzcd$1.run(com.google.firebase:firebase-database@@16.0.3:55) at android.os.Handler.handleCallback(Handler.java:873) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:193) at android.app.ActivityThread.main(ActivityThread.java:6669) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)


MapSelect.java

mAuth = FirebaseAuth.getInstance();
udetail = FirebaseDatabase.getInstance();
DatabaseReference databaseReference = udetail.getReference(mAuth.getUid());
databaseReference.addValueEventListener(new ValueEventListener() {
@override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
userreg userprofile = dataSnapshot.getValue(userreg.class);
alertDialog1.setMessage("Name is:" + userprofile.getName());
alertDialog1.setMessage("Your Contact No:" + userprofile.getPnum());
alertDialog1.setMessage("Your Vehicle No is:" + userprofile.getVeclno());
alertDialog1.show();
}

@override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(MapSelect.this,databaseError.getCode(),Toast.LENGTH_SHORT).show();
}
});

userreg.java

package com.example.bhavya.epark;

public class userreg { public String name,mailid,pnum,veclno;

public userreg(){

}


public userreg(String name,String mailid,String pnum,String veclno){
this.name=name;
this.mailid=mailid;
this.pnum=pnum;
this.veclno=veclno;

}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getMailid() {
return mailid;
}

public void setMailid(String mailid) {
this.mailid = mailid;
}

public String getPnum() {
return pnum;
}

public void setPnum(String pnum) {
this.pnum = pnum;
}

public String getVeclno() {
return veclno;
}

public void setVeclno(String veclno) {
this.veclno = veclno;
}
}


Firebase Database Structure:

 

[zara wymark]

thank you for sharing!!

 

[Deleted User]

thank you for sharing!!

So have you got an answer?