I am trying to show user information stored in my Firebase Realtime Database to text views on a separate page but when I run, LOGCAT is is throwing the error below. I am retrieving the unique id that is stored for the user but Im guessing it is not pulling the data.
This is for a new android studio application that takes a users information stored it in the database and retrieves to a profile pulling all of the information like name, email, school, etc. I have tried changing the object of user and the verification of the user to to authentication check but to no avail. I'm guessing it's a simple fix but I am not seeing it. The error is here.
public class ProfileActivity extends AppCompatActivity {
//Firebase and Database Stuff
private FirebaseAuth mAuth;
private FirebaseUser user; // saying it is never assigned
private TextView Email;
private TextView TwoPNum;
private TextView Meal;
private TextView PantherFunds;
private TextView Expiration;
private TextView Campus;
private Button logout;
private FirebaseDatabase mFirebaseDatabase;
private FirebaseAuth.AuthStateListener mAuthListener;
private DatabaseReference myRef;
// TAG
private static final String TAG = "ProfileActivity";
//declare the database reference object. This is what we use to access the database.
// KEEP AN EYE ON
private String userID = user.getUid();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
Email = (TextView) findViewById(R.id.profileEmail);
TwoPNum = (TextView) findViewById(R.id.profileUid);
Meal = (TextView) findViewById(R.id.mealsNum);
PantherFunds = (TextView) findViewById(R.id.pFundsNum);
Expiration = (TextView) findViewById(R.id.expirationDate);
Campus = (TextView) findViewById(R.id.campusText);
//declare the database reference object. This is what we use to access the database.
mAuth = FirebaseAuth.getInstance();
mFirebaseDatabase = FirebaseDatabase.getInstance();
myRef = mFirebaseDatabase.getReference();
logout = (Button) findViewById(R.id.button_logout);
user = mAuth.getCurrentUser();
mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(FirebaseAuth firebaseAuth) {
user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
toastMessage("Successfully signed in with: " + user.getEmail());
} else {
// User is signed out
Log.d(TAG, "onAuthStateChanged:signed_out");
toastMessage("Successfully signed out.");
}
//... I think a method declaration is meant to go here but not sure
}
};
//new stuff
myRef.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
// This method is called once with the initial value and again
// whenever data at this location is updated.
showData(dataSnapshot);
}
@Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void showData(DataSnapshot dataSnapshot) {
for (DataSnapshot ds : dataSnapshot.getChildren()) {
UserInformation uInfo = new UserInformation();
uInfo.setName(ds.child(userID).getValue(UserInformation.class).getName()); //set the name
uInfo.setEmail(ds.child(userID).getValue(UserInformation.class).getEmail()); //set the email
uInfo.setCampus(ds.child(userID).getValue(UserInformation.class).getCampus()); //set the phone_num
uInfo.setExpiration_date(ds.child(userID).getValue(UserInformation.class).getExpiration_date());// set expiration date
uInfo.setpfunds(ds.child(userID).getValue(UserInformation.class).getpfunds()); // get pantherfunds
uInfo.setMeals(ds.child(userID).getValue(UserInformation.class).getMeals()); // get Meals
uInfo.setTwop_num(ds.child(userID).getValue(UserInformation.class).getTwop_num()); // get Meals
//display all the information
Log.d(TAG, "showData: name: " + uInfo.getName());
Log.d(TAG, "showData: email: " + uInfo.getEmail());
Log.d(TAG, "showData: campus : " + uInfo.getCampus());
Log.d(TAG, "showData: expiration_date: " + uInfo.getExpiration_date());
Log.d(TAG, "showData: pfunds: " + uInfo.getpfunds());
Log.d(TAG, "showData: : meals" + uInfo.getMeals());
Log.d(TAG, "showData: twop_num: " + uInfo.getTwop_num());
// Show Data in TextViews
Email.append(uInfo.getEmail());
TwoPNum.append(uInfo.getTwop_num());
Meal.append(String.valueOf(uInfo.getMeals()));
PantherFunds.append(String.valueOf(uInfo.getpfunds()));
Expiration.append(String.valueOf(uInfo.getExpiration_date()));
Campus.append(uInfo.getCampus());
}
}
I expect for a user to log in and their data be shown in text views but am getting this error message
java.lang.RuntimeException: Unable to instantiate activity ComponentInfo
{com.example.hootidapp/com.example.hootidapp.ProfileActivity}:
java.lang.NullPointerException: Attempt to invoke virtual method
'java.lang.String com.google.firebase.auth.FirebaseAuth.getUid()' on a
null object reference
and
Caused by: java.lang.NullPointerException: Attempt to invoke virtual
method 'java.lang.String com.google.firebase.auth.FirebaseAuth.getUid()'
on a null object reference
at com.example.hootidapp.ProfileActivity.<init>(ProfileActivity.java:45)
