Simple Login App using Database Tutorial - Login Activity (PART 3)

[@ProfessorDK]

The app and code in the video are tested and perfectly working. However, I have seen that some of you are facing difficulties and getting some errors, so here is a beginners guide to debugging: 1) Error: Null object reference Solution: This always means you have given the wrong XML ID, just correct it 2) Error: User Credentials not sent to Firebase Solution: Check if you have added all dependencies else do the following: In Android Studio, go to Tools > Firebase. Click on it. A new tab will open. Click on Authentication > More Info > Email and Password Authentication Link. Another tab will open. Check if the first step shows connected to the database. If not, just click on it and you should be asked for Firebase credentials and on entering that, you will get connected :) 3) Error: App is crashing Solution: Check your logcat section present at the bottom of Android Studio, it will tell you where you have made the error or what caused the error. Just go to that line then and debug. 4) Error: App crashing in emulator: This happens because your emulator doesn't have the latest google play store services. Either update play store or just run it on normal phone Also, some things to note: 1) Every new user must have unique email ID 2) The password length must be more than 8 characters long 3) Internet must be ON Hope this helped everyone :)

[@SouvikVersatile]

When I am clicking login button , it shows login failed . Please help. code---- public class MainActivity extends AppCompatActivity { private EditText email, password; private TextView lognext; private Button logbutton; private FirebaseAuth firebaseAuth; private int counter=5; private TextView Info; private ProgressDialog progressDialog; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); setupUIViews(); Info.setText("No of attempts remaining:5"); firebaseAuth= FirebaseAuth.getInstance(); progressDialog= new ProgressDialog(this); FirebaseUser user =firebaseAuth.getCurrentUser(); // if(user!=null){ // finish(); // startActivity(new Intent(MainActivity.this,SecondActivity.class)); // } lognext.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { startActivity(new Intent(MainActivity.this, UserRegistration.class)); } }); logbutton.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { validate(email.toString(),password.toString()); } }); } private void setupUIViews(){ email=(EditText)findViewById(R.id.log_email); password=(EditText)findViewById(R.id.log_password); lognext=(TextView)findViewById(R.id.log_next); logbutton=(Button)findViewById(R.id.log_button); Info=(TextView)findViewById(R.id.log_attempt); } private void validate(String c1, String c2){ // if((email.equals("[e-mail]")) && password.equals(1234)){ // startActivity(new Intent(MainActivity.this,UserRegistration.class)); // } // else{ // counter--; // Info.setText("No of aattempts remaining:" + String.valueOf(counter)); // if(counter==0){ // logbutton.setEnabled(false); // } // } progressDialog.setMessage("Loading...Please wait"); progressDialog.show(); firebaseAuth.signInWithEmailAndPassword (c1,c2).addOnCompleteListener(new OnCompleteListener() { @Override public void onComplete(@NonNull Task task) { if(task.isSuccessful()){ progressDialog.dismiss(); Toast.makeText(MainActivity.this, "Login Successful", Toast.LENGTH_SHORT).show(); startActivity(new Intent(MainActivity.this,SecondActivity.class)); } else{ Toast.makeText(MainActivity.this, "Login Failed", Toast.LENGTH_SHORT).show(); counter--; Info.setText("No of attempts remaining:" + String.valueOf(counter)); progressDialog.dismiss(); if(counter==0){ logbutton.setEnabled(false); } } } }); } }

[@valmirlimani2314]

Proffesor can u help me please with this error Caused by: android.content.ActivityNotFoundException: Unable to find explicit activity class {com.demo.easylearn/LoginActivity.demo.myapp.SecondActivity}; have you declared this activity in your AndroidManifest.xml?

[@valmirlimani2314]

Activity main : if (user != null) { finish(); startActivity(new Intent(MainActivity.this, SecondActivity.class)); } Android Manifest :

[@dibyajyotimishra7871]

sir how to create a dashboard specific to an user?

[@MohammedAli-mc1dm]

@@valmirlimani2314 It seems you did not create the second activity page or you have named it incorrectly. You may want to watch part 1 and 2 again. That is what i did.

[@faladimabaso6584]

The best tutorial in the world. WOW amazing teacher. keep up the good work. Best Presentation and Explanation why certain things are being done. First time I have been able to connect to Firebase successfully and validating.Please do not be discouraged, continue the good work...

[@kufomatembo8791]

Professor DK, you are the truly more than a professor, your explantion and approach are very ideal and always helping me. Keep it up...

[@MrBooman1984]

You are doing very well. Please keep it up.

[@utkdreaming]

Your series is the most detailed and explanatory, you also helped remove errors thanks a lot.

[@Thisirishlife]

Thanks so much! You really helped connect the dots for me on this topic! You are really good at explaining concepts compared to most videos I've seen.

[@benwiddop7128]

Professor DK you saved my coursework :D

[@GBeRecordings]

Very Helpful, please upload part 4 as soon as possible.

[@ProfessorDK]

Will do. Thanks :)

[@TECHPLUGTamil]

Simply WoW 😲😲

[@namehf]

Hey there! Nice tutorial, I'm really thankful to people like you who take the time to make them. I do have a question though, if you wanted to use the database from a website instead of Firebase, how would you do it?

[@namehf]

Edit : the database in question uses mySQL and phpMyAdmin if that helps ^^'

[@ProfessorDK]

Android has MySQL libraries you can use to connect to your db.

[@izor2210]

dude, i need help. how about if i want to create where user 1 can log in to activity 1, and user 2 can log in to activity 2, because my app need an admin to see all of the data from the user.(it's quiz application, and the admin can make question freely, and the another user must answer and get score from it, then all of the result can be see by admin)

[@SKREFI]

Sup mate, maybe it is a little to late, but what if you make the app do something else if email == "your@email" && password == "yourpassword". Like, go into an other activity hidden from the real app where you can add questions :) Hope it helps, even tho in 9 months I am sure you found a way and I would like to know how you did it, maybe there is a better idea then mine :) Thank you.

[@romnicknitro4086]

thanks for the tutorial.. it helps me a lot on my project,, its easier to use firebase as database than the sqlite.. creating a table in SQL is a hell lot of coding,,hehe

[@pratikprajapati8620]

Best explanation sir

[@techwithjovi8499]

sir when i launch my app it goes straight to second activity without passing by login activity or registration activity, but if i remove this code if (user !=null){ finish(); startActivity(new Intent(MainActivity.this,HomeActivity.class)); } it works but not login in pls help

[@rwill.7313]

I missed it, because it is very short, but at 14:30, there is a note that says to "Go to Settings > Apps / App Info > (LoginDemoApp) > Clear All Data (for the app)" BEFORE you open the app. That will take you to the login page instead of the SecondActivity. Also, note that you have to login with your EMAIL ADDRESS instead of your NAME. I still have a problem if I do not sign in correctly. The app will stop working. But this may be a start, and perhaps it will be corrected in future videos.

[@feeqqaa]

Not sure if you still need the another alternative solution beside what Ricardo has provided but you can just change the user != null to user == null and the app will bring you to the login/registration activity page first. user != null means it is to check whether the user has logged in on their first time, and if they are logged in (AND IF YOU DON'T HAVE A LOGOUT FUNCTION) then this mean whenever you run your app it'll always bring you to the second activity and not the login/registration activity. However, user == null means it will always check first and "pretend" always that it is the user's first time using the app. Hope you understand my explanation though!

[@whacker4321]

Amazing content !!! You are helping me so much !!! I am learning so much more !!! Thank you !!

[@YashwantKharsan]

i want to get "already registered" message. when user try to register the account again which is already created.

[@siddhantamohapatra1375]

This is really helpful ..thank you for sharing this wonderful thing..I'm a newbie in Android development , I'm making a food ordering app, used sign up and sign in as per your video..Can you help me making it in future videos..it will be really helpful for me as well as people like me who wants to make an app

[@ProfessorDK]

+siddhanta mohapatra Yes, other videos will be uploaded in a week :)

[@siddhantamohapatra1375]

Thank u so much@Professor DK

[@HimanshuSingh-rp1ui]

My if statement is not working in registeractivity what should i do

[@arpitkumar2543]

Thanks sir you are doing a good job ..... and yes i will subscribe this channel . Sir, i need to clear data each time i start the app are we going to solve this problem in this series ??

[@ProfessorDK]

This is only until the app completes. Once the series is completed, you no longer have to clear the data. Don't worry :)

[@feeqqaa]

Your tutorials have been great so far! Thank you so much for all the hardwork! Things have been going fine EXCEPT for the part where my app will crash/force close if I don't put in any credentials. logcat state, "2018-10-18 11:15:27.070 3070-8735/com.google.android.googlequicksearchbox:search W/VelvetNetworkClient: Cannot connect to server without account" and run tab state, "java.lang.IllegalArgumentException: Given String is empty or null" I did googled for the argument exception error though and most StackOverflow replies said it has something got to do with the blank current_key on the json file and I should input a random key. However, when I checked the json file, my current_key is stated and it's not blank. So I have no idea where else the fault lies on? Do you know how I can fix this? Please do guide me. Thanks everyone~

[@ProfessorDK]

This issue gets resolved in the later part of the series. Don't worry :)

[@feeqqaa]

Noted with many thanks, Sir!! :)

[@thirunayandinesh8646]

Hi sir, your videos are really explanative and easy to understand. Can you make a video on how to add events for android calendar view? please reply

[@bwinabarbie276]

Sir the code which u have published the same i have given but there is a problem that my app crashes when i debug it with the code what can i do sir can u help me?

[@DiscoverLivelife]

Hi Dheeraj, i was looking for this type of step by step videos.. I saw few other channels videos but i m not happy with that videos every time something they have missed where i could not understand. But here in this videos all are clear and step by step with every variable and string what does.. Please make video how to register with mobile number with validation.. Because as we are moving to advance.. Every one want quick action.. So better to be validatr through mobile number...i m waiting for the same on next video... Thanks.. :) Also if you could provide code link in each video it will be better learn with the same..

[@ProfessorDK]

Thank you for the wonderful comment and honest feedback. Appreciate it. I'll surely do a video on mobile phone authentication soon. Code link has been added in the description of the video :)

[@DiscoverLivelife]

Professor DK I sent email to u on ur email id yesterday regarding one of error i saw the difference between u and my work is ur working on Android studio 2.3 and i m working on 3.0.1 may be that the reason it got crashed on my system as there error on root level gradle file.... Where we set the compiler... If u could make the videos on latest version 3.0.1.. It will better for us to rectify us..

[@ProfessorDK]

Check out my video: kzbin.info/www/bejne/lZqyg4d8fql0d5o in this video I upgrade to the latest version and also solve doubts regarding differences between the versions, do check it out :)

[@sumas562]

Sir u can also explain, how we can Implement multiple users login

[@Programming177]

do u know?

[@rajkamal242]

After doing what u have say'n .My app has got empty login page .Means literally there is nothing in my login page{blank).

[@bollymixraja889]

amazing tutorial. please upload the next videos too. Please also guide how to include logout facility in second activity

[@ProfessorDK]

Yes I will be covering that in the next video. Will be out soon, thank you! :)

[@MohammedAli-mc1dm]

Thank you so much!!! Great! Great! Great! I have learned a lot from your videos! One thing from this part, after completing this part, the app launches the second_activity page first by default. It was launching the activity_main in your part1 and 2 videos. Not sure what I did wrong. I have spent a lot of time trying to research this mistake. Checked the Manifest. XML and all look normal there. Any help would be grateful!

[@MohammedAli-mc1dm]

NVM i fixed it. Sorry i didn't see your message at the end. I uninstalled and reinstalled the app on the phone app and it launched the main activity ::

[@engr.anowarulislam5479]

How to validate the input fields?

[@chakhna]

Sir what happened when i am login and i press back button.its exit or go back to previous activity.

[@indrajajogi1601]

Hello sir. Plzz suggest how to make Admin login along with User login plzzz. Sir in same video

[@alaabidalhussain2710]

Yes very important aspect to be covered.

[@ritikakalla32]

Very nice Explaination Sir. My Login page is not appearing when I run the app it directly open SecondActivity , why is it so??

[@bradleyj4635]

Ritika Kalla same problem for me

[@klkdz]

@@bradleyj4635 ME TOOO. did you solve the problem already?

[@Abhishekyadav-mo6py]

on running the app it is opening the second activity windwo

[@candidconnections5762]

When i am trying to run the app its not running .Just opens and then closes with a message 'app has stopped working' In android studio it shows no error on building.But a dialogue box appeared once saying all packages can't be downloaded.

[@ChInzZenFloW3102k]

I like it, please more videos ❤️

[@waelaldroubi6313]

Dear Professor DK, the application is working but when I press on create new user the application crashes and ask me to restart the application, what to do please? thank you

[@prashanthkumar4222]

thanks a lot bro good explanation

[@SatyaP746]

one more problem is that when I press the login button without filling any information, my app is going to stop(unfortunately the app has stopped) error is- 01-17 14:19:25.969 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:25.969 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:25.969 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:25.999 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:25.999 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.009 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.009 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.029 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.029 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.049 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.049 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.069 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.069 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:26.079 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.449 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.469 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.479 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.499 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.499 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.509 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.509 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.529 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.539 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.539 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:19:29.549 31715-31715/com.sprakash.loginandregistration W/IInputConnectionWrapper: getExtractedText on inactive InputConnection 01-17 14:19:29.569 31715-31715/com.sprakash.loginandregistration W/IInputConnectionWrapper: beginBatchEdit on inactive InputConnection 01-17 14:19:29.569 31715-31715/com.sprakash.loginandregistration W/IInputConnectionWrapper: endBatchEdit on inactive InputConnection 01-17 14:19:36.029 31715-31715/com.sprakash.loginandregistration W/BiChannelGoogleApi: [FirebaseAuth: ] getGoogleApiForMethod() returned Gms 01-17 14:20:07.289 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.289 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.289 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.349 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.349 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.349 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.AppCompatEditText,packageName = com.sprakash.loginandregistration 01-17 14:20:07.349 31715-31715/com.sprakash.loginandregistration D/OppoEditor: OppoEditor, classname = android.support.v7.widget.Ap

[@SatyaP746]

Now its working

[@shubhamsrivastava4088]

My app keeps on crashing. please help!

[@SportSHorts73]

Due to if(user! =null) condition from registrationActivity it is directly going to secondActivity, Can you help me

[@ProfessorDK]

Go over to settings and clear data of the app

[@anuraggupta5665]

Sir I'm facing problem while registering. Actually when i goto registration activity and input data, after clicking register button registration gets successful but then automatically instead of going to Mainactivity it directly moves to second activity. I've checked and matched my codes with urs many times but couldn't figured the mistake. Please help me. So I can move to next part of tutorial.

[@harshithchoudhary5805]

Dude i am facing the same problem, did you find any solution?

[@dennismaina1657]

Hi, I created my app succesfulyy. Unfortunately. When a user registers. it automaticaly logs the in. I need them to be logged in only when they log in

[@bradleyj4635]

How to validate if the input fields are empty then set error message ?

[@rupertacuesta]

Bradley J that should be a simple statement such as using an if statement. For instance, something like if(name.equals(“ “)) { Toast.makeText(“please fill this field); }

[@bloodhero5958]

When I click LOGIN button without inputting email and password app is crashing

[@ProfessorDK]

Check if you assigned the right XML ID to the login button :)

[@fingerstylesahil7678]

I am facing the same error, even the XML ID added to the Button is correct. Please help

[@damilolaawoma4087]

Yes please, am also getting a crash when I input on the username or password

[@tantelyariellelauraratsito3647]

hello! it was really helpful but It only works if I register a new user but if I log with pre-registered user,the login failed why?

[@auoo1000]

Sir, as I run the app, I am straightaway sent to second activity, what could be the problem? I can't find any misplaced intent

[@stymdxt]

Did you figured out how to solve this?

[@brindhar5021]

For me also 😔

[@auoo1000]

@@stymdxt yes i found a way but forgot what i did to correct it now😂

[@stymdxt]

@@auoo1000 thnx..i too figured it out and now don't have any idea how i fixed it..can understand

[@pradipsalgude3331]

sir after registration username and password is not accepted login failed all code is right

[@indrajajogi1601]

I am to getting Same Error

[@ArunKumar-pq6yj]

Pls help

[@niranjanadevisekar3505]

Use email id for username instead of user name

[@ArunKumar-pq6yj]

@@niranjanadevisekar3505 thnx

[@kateshirazi5642]

@@ArunKumar-pq6yj I am still getting this issue. did it get fixed for you

[@chaitrashetty6781]

My app crashes if i dont enter the email and password and directly click the login button. How should i display an error message when the details are not entered and stop the app from crashing?

[@kashishgautam5224]

there is an error showing "Cant build to local 8604 for debugger" and many more no. like this ??? what to do ???

[@Programming177]

sir how to add this code to fire store

[@mansivijay4044]

Sir, in my device it is saying that registration is successful but there is no update observed in firebase. What could be the possible reasons?

[@ProfessorDK]

Check if you are connected to firebase under tools > firebase > authentication.

[@bharathcool4387]

Sir, can u also explain how to implement resetting the password?

[@ProfessorDK]

+bharath cool Sure buddy :)

[@jayedm3342]

very nice

[@kiarashukla4546]

progessDialog is deprecated and is not working , alternative is progessbar but I don't know how to use that. Need Help

[@ProfessorDK]

Okay will make a video to cover that :)

[@ashbalbinaqeel3539]

you are great sir :)

[@sadisusalisu216]

Wow very wonderful videos Professor, but please i have SPLASH ACTIVITY. But whenever the splash activity finish it directly go to the main page not login activity. help me on that please.

[@ProfessorDK]

Firstly go to app info, removed all cache data and try again. If it is still going to main page, it means your intent in splash activity is wrong. Either of these.

[@sadisusalisu216]

Thank you very much Professor dk, I tried to do that but whenever I navigate to the Apps settings the settings is stopping ( crashing.

[@sadisusalisu216]

wow Thank you very much professor, it works perfectly, I delete it and debug it again.

[@archy-x]

How can you make a log out button in the second activity?

[@ProfessorDK]

Just add the button in the second activity layout and then add the logout functionally code like I have done in that

[@rwill.7313]

Yes... I missed it, because it is very short, but at 14:30, there is a note that says to "Go to Settings > Apps / App Info > (LoginDemoApp) > Clear All Data (for the app)" BEFORE you open the app. That will take you to the login page instead of the SecondActivity. Also, note that you have to login with your EMAIL ADDRESS instead of your NAME. I still have a problem if I do not sign in correctly. The app will stop working. But this may be a start, and perhaps it will be corrected in future videos.

[@Toha_H]

Firstly, I thank you for such a detailed video, I learned a lot of useful information. But I encountered the following problem (already this question was asked): after the start activity, a transition to the last created activity takes place. The Intent is written correctly, on the form of authorization. I cleared the cache, but this only helps before the application closes the first time, after all it repeats again. I apologize for my English, I use an interpreter.

[@ProfessorDK]

Use finish() to destroy any activity you don't want to return to.

[@yashsonavane8096]

Hello sir, I have created the entire app accordingly but when i run it, directly the second activity is displayed. What shall I do now ?

[@ProfessorDK]

Go over to settings, app info and then delete any existing data. Then run the app again :)

[@rwill.7313]

Yes... I missed it, because it is very short, but at 14:30, there is a note that says to "Go to Settings > Apps / App Info > (LoginDemoApp) > Clear All Data (for the app)" BEFORE you open the app. That will take you to the login page instead of the SecondActivity. Also, note that you have to login with your EMAIL ADDRESS instead of your NAME. I still have a problem if I do not sign in correctly. The app will stop working. But this may be a start, and perhaps it will be corrected in future videos.

[@rupertacuesta]

So i run the app and the login page isnt appearing straight away, its the second activity that pops up...?

[@srikanthvaddeboina8144]

Hi I am facing the same problem..did you found the way to rectify it??

[@rupertacuesta]

Srikanth Vaddeboina its been a whole year since I’ve done this😅 don’t quote me on it but maybe mess around with which one to set visible, can’t remember much from that far back.

[@srikanthvaddeboina8144]

@@rupertacuesta oh ok 😅 Thanks

[@vivins3215]

After login from firebase I want to pass that username to a dashboard

[@AK1_3]

sir when will you do video on refer and earn program

[@ProfessorDK]

Right now timetable app series and login app series are going on. It will take some time. Thank you for your patience :)

[@imanuellagurue3802]

why this code if(emailflag){ finish(); startActivity(new Intent(MainActivity.this, BlankFragmen.class)); not support FragmentClass??

[@ProfessorDK]

It does

[@pratikjawa6665]

SIr when i login still it takes me to the register page whereas it should sign me into second activity. What can be the problem?

[@ProfessorDK]

Check your intent. Maybe you have given the wrong destination class

[@pratikjawa6665]

Professor DK got it silly mistake😂😂

[@mansivijay4044]

Due to if(user! =null) condition from registrationActivity it is directly going to secondActivity, so I had to remove it and it finally worked. Can you explain me the reason?

[@ProfessorDK]

It is used to save the user from logging in again. So until the user logs out, the user is not equal to null and you can direct the user to home page of app saving one the effort after they have logged in once.

[@gabzmann7270]

Hi, whenever i try to login it crashes. It crashes when i leave in the "if(user != null)" condition. When I leave out that condition it works, but doesn't load the SecondActivity page. Any ideas?

[@ProfessorDK]

There is some problem in your SecondActivity.java. that's why it isn't loading. Check for the logcat error :)

[@gabzmann7270]

Hey it doesn't crash now, but I've done exactly what you did, but any time i login, it fails. Would you have any ideas why?

[@rwill.7313]

+Gabzmann: I don't know if this will help, but I realized that I have to use my email and password (not my name and password) to login. And the password has to be at least 8 digits and a mixture of letters and numbers, I think. And the user needs to already be in the "users" screen in Firebase. In other words, you need to have successfully signed up.

[@70shehan]

i got this kind of errot message while running the app.. how can i resolve it sir ""F:\MC project\StudentInfomationSystem\app\src\main\java\com\example\studentinfomationsystem\screentwo.java: uses or overrides a deprecated API. Recompile with -Xlint:deprecation for details.""

[@chakhna]

Sir i implement progressdialogue in register activity after that i create new registration.it go to secount activity without going main activity.

[@chakhna]

Helpme sir

[@manishugru5593]

I too have same problem..help me sirrrr

[@ProfessorDK]

Check what u have given inside the Intent. Maybe you have given the destination as secondActivity :)

[@chakhna]

Professor DK no sir given main activity.

[@ProfessorDK]

Oh okay yeah. I checked. I will be explaining and correcting the error in my new video releasing today :)

[@Bizniiz]

everything works fine. but why i get logged in automatically after i register an account?

[@gnaneshgn8341]

ProgressDialog is not displaying an message....please help..!!

[@MohamedAhmed-lr5xs]

tell me what u typed as a code for the ProgressDialog

[@saiteja331]

Without data if I click login button it's closing app and showing app stopped

[@ProfessorDK]

There can be two reasons for this: 1) You must have assigned the wrong XML ID to the variable in Java 2) You haven't added the function to check if the data inside the edit text is empty or not

[@prabinkarki4436]

Very nice video I have learnt many things from this video thank you so much But in my login form password field is not accepting alphabet only number it is accepting why sir???

[@damilolaawoma4087]

Sir please the app crashes when I login with only username or password. Except if I put both details it works perfectly well

[@prakashwaddar5293]

Sir i need registration code.

[@MustafaKamal-iz8vs]

Thank you waiting for next video and recommended that make a video on text recognition library to recognition digits its request Thank you..🙂

[@ProfessorDK]

Okay definitely. Will cover it in the next video! :)

[@samisyed899]

How can we make it work using any username and password instead of email

[@ProfessorDK]

storing email and password or login through phone are the only methods of secured authentication which are present in any technology. You could do login with username but the app won't be secure and can't be trusted :)

[@nithinpinapaka]

Sir how to get logout after signing in

[@ujjalkumarray9427]

thank you so much sir.

[@razellaliaps8081]

please upload part 4 :)

[@chewemvula1386]

hi Professor these is a very helpful videos thanks so much.....i am having difficulties in "signing up" i keep getting this message "unfortunately app has stopped working" how do i go about this??

[@ProfessorDK]

+Chewe Mvula Could you post the message seen in your logcat when it crashes. It will help me debug better :)

[@chewemvula1386]

02-07 08:53:14.062: E/Surface(1639): getSlotFromBufferLocked: unknown buffer: 0xaa392ce0 is this what you are looking for??or can i send you a screen shot of my logcat

[@ProfessorDK]

+Chewe Mvula Not this. Send the entire thing to my mail [e-mail]

[@jkuhede]

Thanq Ji !

[@patelvaibhavee1766]

Registration fail a rha hai . please help me

[@tubagusputra5788]

I got some error code when installing the APK. the code says "Error:(47, 30) error: cannot find symbol class progressDialog" What should I do, Prof?

[@ProfessorDK]

Its ProgressDialog with capital P

[@kinleypenjor3310]

@@ProfessorDK Sir my whole code here for registration. I user is not getting inserted in firebase. can you help me pls. package com.example.testlogin; import androidx.annotation.NonNull; import androidx.appcompat.app.AppCompatActivity; import android.content.Intent; import android.content.SharedPreferences; import android.net.Credentials; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; import android.widget.Toast; import com.google.android.gms.tasks.OnCompleteListener; import com.google.android.gms.tasks.Task; import com.google.firebase.auth.AuthResult; import com.google.firebase.auth.FirebaseAuth; public class RegistrationActivity extends AppCompatActivity { private EditText eRegName; private EditText eRegEmail; private EditText eRegPassword; private Button eRegister; private TextView userLogin; private FirebaseAuth firebaseAuth; ; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_registration); setupUIViews(); firebaseAuth = FirebaseAuth.getInstance(); eRegister.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { if(validate()){ //register to the database; String user_Email = eRegEmail.getText().toString().trim(); String user_Password = eRegPassword.getText().toString().trim(); firebaseAuth.createUserWithEmailAndPassword(user_Email,user_Password).addOnCompleteListener(new OnCompleteListener() { @Override public void onComplete(@NonNull Task task) { if (task.isSuccessful()){ Toast.makeText(RegistrationActivity.this, "Registration Successful",Toast.LENGTH_SHORT).show(); startActivity(new Intent(RegistrationActivity.this, MainActivity.class)); } else { Toast.makeText(RegistrationActivity.this, "Registration failed",Toast.LENGTH_SHORT).show(); } } }); } } }); userLogin.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { startActivity(new Intent(RegistrationActivity.this, MainActivity.class)); } }); } private void setupUIViews() { eRegName = findViewById(R.id.etregname); eRegEmail=(EditText) findViewById(R.id.etemail); eRegPassword = (EditText) findViewById(R.id.etregisterpassword); eRegister = (Button) findViewById(R.id.btnregisterpass); userLogin = (TextView) findViewById(R.id.tvalreadyregister); } private Boolean validate() { Boolean result = false; String name = eRegName.getText().toString(); String email = eRegEmail.getText().toString(); String password = eRegPassword.getText().toString(); if (name.isEmpty() || password.isEmpty() || email.isEmpty()) { Toast.makeText(this, "Field is empty", Toast.LENGTH_SHORT).show(); } else { return true; } return result; } }

[@mikimartinez7904]

Sir where is the app info and how to delete the data?

[@ProfessorDK]

Settings > Installed Apps > LoginDemo > App info. Delete all data

[@mr.akshitagarwal7123]

Sir. I Liked Your Videos very much and they helped to learn app development.. But In this example I did same as you said in the video but when I am running the code.... my apps starts with directly with the SecondActivity but if I comment the following code: FirebaseUser user = firebaseAuth.getCurrentUser(); if(user!=null) { finish(); startActivity(new Intent(MainActivity.this,SecondActivity.class)); } My app does not allow to go to second activity even with correct username and password... PLEASE HELP SIR..

[@DanielShuster96]

Hello tnx for the vid!! but i got a problem, even if the login failed it automatically redirect me to the seconed page, pls help?!!

[@DanielShuster96]

I did it without the countdown!! if it metters..

[@DanielShuster96]

Same thing if i register sucssefuly

[@stymdxt]

Did you figured out how to solve this

[@nooruddinshaikh124]

There is no error in my coding but when i am running the app it get crash and showing this error Like Fatal Exception Main and java.lang.runtime exception : unable to start the process and some more error similar to this is showing......Sir Please Help me Out

[@ProfessorDK]

Could you post your logcat error?

[@nooruddinshaikh124]

E/AndroidRuntime: FATAL EXCEPTION: main Process: shareindia.nooruddin.shareindia, PID: 7992 java.lang.RuntimeException: Unable to start activity ComponentInfo{shareindia.nooruddin.shareindia/shareindia.nooruddin.shareindia.LoginPage}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2791) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1574) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:203) at android.app.ActivityThread.main(ActivityThread.java:6364) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1076) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:937) Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnClickListener(android.view.View$OnClickListener)' on a null object reference at shareindia.nooruddin.shareindia.LoginPage.onCreate(LoginPage.java:46) at android.app.Activity.performCreate(Activity.java:6691) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1124) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2744) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2856) at android.app.ActivityThread.-wrap12(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1574) at android.os.Handler.dispatchMessage(Handler.java:110) at android.os.Looper.loop(Looper.java:203) at android.app.ActivityThread.main(ActivityThread.java:6364) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1076) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:937) I/Process: Sending signal. PID: 7992 SIG: 9 Application terminated.

[@ProfessorDK]

In your loginpage.java file, line number 46, i think the Button you have defined has the wrong XML id. Check the part where you did the findViewByID for the button :)

[@nooruddinshaikh124]

Professor DK i have not declare the line 46 object as button but i have declare it has textview for if the user is not registered by clicking on that text view page shall goto registration activity

[@komalkasyap7104]

Sir , everytime I logged into app I got login failed. please help me

[@ProfessorDK]

Make sure you register with a new email id each time. Else just delete all users from Firebase website and then create new user to login.

[@SouvikVersatile]

I am also facing the same issue.

[@pranayasharma819]

Thank you sir!!

[@cheonsagel9544]

May I have your permission to copy this application?

[@swastikijari1159]

Inactivity, disconnecting from the service ,i am getting this error plz help me

[@ProfessorDK]

Are you running it on the emulator?

[@jan-lucag3490]

Hey, Great Tutorial! Unfortunately I have an issue with the login. Every time i try to login with some login data from the database it says "Login failed". I have everything exactly like you but i left out the five attemps. What should I do now? Can someone help me?

[@ProfessorDK]

+Jan-Luca Ganz Have you enabled SignIn method on the website? Check if the internet connection is working, also check if you have added all the dependencies :)

[@Staliscyrils]

Hi Professor DK, Thanks for the tutorial. I also enabled the sign in method on the website, but can not sign in to the app after logging out

[@kateshirazi5642]

@@Staliscyrils I am having the same issue. were you able to fix it?

[@HimanshuSingh-rp1ui]

It's always showing registeration failed

[@konstantinosnikoloutsos3402]

I believe firebase has created firebase UI for us so that we dont have to create xml layouts.

[@bhavanaanumanchipalli3181]

hii sir ....thanks for your video's...these helped me a lot ...but I got a problem that ...in the case of giving login credentials wrong ones ,it should show the login failed message and no of attempts remaining but the app is going to be stoped in this case .In case of correct login credentials ,it's perfect. Can u please help me with this???

[@ProfessorDK]

+Bhavana Anumanchipalli Could you post the error message seen in your logcat when the app crashes?

[@bhavanaanumanchipalli3181]

Professor DK ...there is no error in the logcat sir .... "unfortunately,the app(name of the app) is stopped" is the message that is shown when I enter the wrong credentials into the login form.

[@ProfessorDK]

+Bhavana Anumanchipalli Check if you have defined the Textview which is used to display the number of attempts remaining

[@bhavanaanumanchipalli3181]

Professor DK ...yeah ,I have done it

[@ProfessorDK]

+Bhavana Anumanchipalli I have added the code links in the description. Compare your code with that.

[@arjunwalia737]

Hi sir this was a very helpful video...but whenever i am trying to login after signup, it says login failed and the counter decreases...please help me.!

[@ProfessorDK]

Use username.equals("admin") instead of username == admin. Do the same for password. It will work :)

[@arjunwalia737]

Professor DK sir, this was when we gave the string earlier when there was no use of fire base (this issue was solved) but now after using firebase the login is not possible, i mean it shows login failed

[@arjunwalia737]

Professor DK please sir help me...im making a project for major, and i am short on time

[@arjunwalia737]

Professor DK sir can u please help.. I'm in a middle of something here.

[@amankamboj890]

Hello Arjun, How you resolved your error? I am also facing the same issue....

[@len5120]

Sir, please give tutorial on logout after this login otherwise whenever I launch the app, it directly goes to the secondactivity. please help sir

[@ProfessorDK]

You can go to settings > app info and delete all data. Then you can restart the app to get the first activity! :)

[@manishugru5593]

where is app info?

[@manishugru5593]

please help me....i too have the same problem

[@manansoni815]

this is temp solution. when i register with new email it directs to SecondActivity i dont know how because i set intent to reg.this to mainactivity.class

[@krupalpatel5399]

Sir !! Nice Video , But I have one Error When i register User First time registe Sucessfully... But After First time it always show "Registration Fail!!!". plz fix

[@ProfessorDK]

You can only create a user once. You cannot create another user with the same email. It must be unique :)

[@jdcoding1012]

Thank you

[@kailashsharanbaral3645]

sir could u please upload the source code??

[@ProfessorDK]

No problem. It has been posted in the description of the video! :)

[@patelvaibhavee1766]

Loginn is fail . App is stopped. And second activity is not opened.

[@christopherhartanto691]

Must be Email instead username(without @gmail.com and so on)