How to get uid from another activity

Question

Why is it when i toast it like this it really toasts the current users uid

Toast.makeText(this, "" + firebaseUser.getUid(),Toast.LENGTH_SHORT).show();

but when i do it like this

databasePassenger.child("Passenger").child(firebaseUser.getUid())
                 .addValueEventlistener(new ValueEventListener() {
 @Override
 public void onDataChange(DataSnapshot dataSnapshot) {
     adapter.add(("Name: \t") +dataSnapshot.child("Name").getValue());

It displays Name: null

save uid in sharepreference in order to use in another activity — Hitesh Gehlot, May 05 '17 at 05:06
how can i save uid in sharedpreference sir @HiteshGehlot ? (Sorry im beginner) - — reginelae, May 05 '17 at 05:12

Alex Mamo · Answer 1 · 2017-05-05T11:50:20.097

0

If you want use the uid in another activity please use this code.

In the FirstActivity:

if (firebaseUser != null) {
    String uid = firebaseUser.getUid();
    Intent intent = new Intent(FirstActivity.this, SecondActivity.class);
    intent.putExtra("uid", uid);
    startActivity(intent);
}

In the SecondActivity:

String uid = (String) getIntent().getExtras().get("uid");

Hope it helps.

edited May 05 '17 at 11:50

answered May 05 '17 at 07:24

Alex Mamo

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somethings wrong with it, it says. java.lang.RuntimeException: Unable to start activity ComponentInfo{soco.itproject.com.hitch_passenger/soco.itproject.com.hitch_passenger.BookingActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.os.Bundle.get(java.lang.String)' on a null object reference – reginelae May 05 '17 at 11:46
Your `firebaseUser.getUid();` is different than `null`? – Alex Mamo May 05 '17 at 11:51
I haven't solve it yet sir .Maybe its because im not done yet implementing the sharedpreference – reginelae May 08 '17 at 04:14
Yes, another approach is to use `SharedPreferences`. Would you like me to send you a post regaring this way of solving the problem? – Alex Mamo May 08 '17 at 09:08
Yes sir, please!. Thank you! – reginelae May 08 '17 at 15:29
Please take a look at this [post](http://stackoverflow.com/questions/3851560/how-to-use-sharedpreferences). It will learn you how to store and retrieve strings with SharedPreferences. – Alex Mamo May 08 '17 at 15:36
this is my line of code `sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this); SharedPreferences.Editor editor = sharedPreferences.edit(); editor.putString("User ID: ",userID); editor.commit(); if (editor != null){ System.out.println(editor); }` --------------------------------------------------------------- But it prints `System.out: android.app.SharedPreferencesImpl$EditorImpl@202c23b` – reginelae May 09 '17 at 04:02
I suggest you iterate on the content of the `SharedPreferences`. – Alex Mamo May 09 '17 at 08:39

How to get uid from another activity

1 Answers1