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onclicklistner on videoview in recyclerview

hi i am building a app where, i show videos from firebase to videoview which is in recyclerview in gridlayout form, means at each fragment there are two videos shown, i want to add on clicklisten to them as when someone click on it, a new activity opens and at that activity, the same video is shown in fullscreen (vertically). i used putextra to transfer my data, but i am getting error, "uristring",
bellow is my code
Adapter code
package com.example.godhelpme.Adapter;
import android.content.Context;
import android.content.Intent;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.MediaController;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.RecyclerView;
import com.example.godhelpme.Fragments.HomeFragment;
import com.example.godhelpme.FullScreen;
import com.example.godhelpme.LoginActivity;
import com.example.godhelpme.MainActivity;
import com.example.godhelpme.Model.Post;
import com.example.godhelpme.Model.User;
import com.example.godhelpme.R;
import com.example.godhelpme.StartActivity;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.List;
public class PostAdapter extends RecyclerView.Adapter<PostAdapter.ViewHolder>{
private Context mContext;
private List<Post> mPosts;
private FirebaseUser firebaseUser;
public PostAdapter(Context mContext, List<Post> mPosts) {
this.mContext = mContext;
this.mPosts = mPosts;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.upload_item, parent,false);
return new PostAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
Post post = mPosts.get(position);
try {
String link = post.getVideourl();
MediaController mediaController = new MediaController(mContext);
mediaController.setAnchorView(holder.video1);
Uri video = Uri.parse(link);
holder.video1.setMediaController(mediaController);
holder.video1.setVideoURI(video);
holder.video1.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
#Override
public void onPrepared(MediaPlayer mediaPlayer) {
try {
if (mediaPlayer.isPlaying()) {
mediaPlayer.stop();
mediaPlayer.release();
mediaPlayer = new MediaPlayer();
}
mediaPlayer.setVolume(0f, 0f);
mediaPlayer.setLooping(false);
mediaPlayer.start();
} catch (Exception e) {
e.printStackTrace();
}
mediaController.setVisibility(View.GONE);
}
});
holder.video1.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.start(); }
});
holder.id.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent in = new Intent(view.getContext(),FullScreen.class);
in.putExtra(" videourl", post.getVideourl());
in.putExtra("publisher", post.getPublisher());
in.putExtra("postid", post.getPostid());
view.getContext().startActivity(in);
}
});
}catch (Exception e){
Toast.makeText(mContext,e.getMessage(), Toast.LENGTH_SHORT).show();
}
FirebaseDatabase.getInstance().getReference().child("Users").child(post.getPublisher())
.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
User user = snapshot.getValue(User.class);
holder.id.setText(user.getUsername());
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
}
#Override
public int getItemCount() {
return mPosts.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
public VideoView video1;
public TextView id;
public ViewHolder(#NonNull View itemView) {
super(itemView);
video1 = itemView.findViewById(R.id.video1);
id = itemView.findViewById(R.id.id);
}
}
}
THAT ACTIVITY CODE WHERE I WANT TO SHOW
package com.example.godhelpme;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Context;
import android.content.Intent;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.widget.MediaController;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;
import com.example.godhelpme.Model.Post;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;
public class FullScreen extends AppCompatActivity {
VideoView videoFull;
TextView idFull;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_full_screen);
videoFull = findViewById(R.id.videoFull);
idFull = findViewById(R.id.idFull);
Intent in = getIntent();
try{
String ttr = in.getStringExtra("videourl");
MediaController mediaController = new MediaController(this);
mediaController.setAnchorView(videoFull);
Uri video1 = Uri.parse(ttr);
videoFull.setMediaController(mediaController);
videoFull.setVideoURI(video1);
}catch (Exception e){
Toast.makeText(this,e.getMessage(), Toast.LENGTH_SHORT).show();
}
videoFull.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
#Override
public void onCompletion(MediaPlayer mediaPlayer) {
mediaPlayer.start(); }
});
idFull.setText(in.getStringExtra("publisher"));
}
}
PLEASE HELP GUYS PLEASE

It took me three days to figure out what's the problem in my code. After knowing my mistake i am feeling very ashamed as well as happy that i figured, it out.
the mistake is in the adapter code,
in.putExtra(" videourl", post.getVideourl());
String ttr = in.getStringExtra("videourl");
the difference between above two code line is the, in first line there is space before the videourl and in the second line there is no space before videourl, and that's a problem. :-)

(Android) When Back pressed, Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference

I've been working on a Android Project (A Basic College Information App), I have three main activities, the user goes in like, Goal/Course Select activity-> CollegeList activity-> College Details Activity. Now When I press back on College Details Activity it crashes with this Error:
Attempt to invoke virtual method 'int java.lang.String.hashCode()' on a null object reference
Below are the files/code which I think might be responsible for this.....
CollegeListActivity.java file
package com.anurag.college_information.activities;
import static com.anurag.college_information.activities.CareerGoalActivity.GOAL;
import static com.anurag.college_information.activities.CareerGoalActivity.SHARED_PREFS;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.anurag.college_information.R;
import com.anurag.college_information.adapters.RecyclerAdapter;
import com.anurag.college_information.models.ModelClass;
import java.util.ArrayList;
import java.util.List;
public class CollegeListActivity extends AppCompatActivity {
private RecyclerAdapter.RecyclerViewClickListener listener;
//ListView collegeList;
TextView collegeListTitle;
Button courseChange;
RecyclerView recyclerView;
LinearLayoutManager LayoutManager;
RecyclerAdapter recyclerAdapter;
List<ModelClass> cList;
String courseName;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_college_list);
collegeListTitle = findViewById(R.id.college_list_title);
courseChange = findViewById(R.id.btn_change_course);
//collegeListTitle.setText(goal + "Colleges");
collegeListTitle.setText(getIntent().getStringExtra("Title") + " Colleges");
initData();
initRecyclerView();
//collegeList = findViewById(R.id.lv_college_list);
courseChange.setTransformationMethod(null);
courseChange.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
SharedPreferences sharedPreferences = getSharedPreferences(SHARED_PREFS, MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPreferences.edit();
editor.clear();
editor.apply();
Intent i = new Intent(CollegeListActivity.this, CareerGoalActivity.class);
startActivity(i);
//finish();
}
});
}
private void initData() {
cList = new ArrayList<>();
courseName = getIntent().getStringExtra("Title");
switch (courseName) {
case "BE/BTech":
cList.add(new ModelClass("https://images.static-collegedunia.com/public/college_data/images/campusimage/1479294300b-5.jpg", "A.P. Shah College of Engineering", "Thane", "8.0"));
break;
case "Pharmacy":
cList.add(new ModelClass("https://images.static-collegedunia.com/public/college_data/images/campusimage/14382400753.jpg", "Bombay College Of Pharmacy", "Mumbai", "9.0"));
break;
}
}
private void initRecyclerView() {
setOnClickListener();
recyclerView = findViewById(R.id.recycler_view);
LayoutManager = new LinearLayoutManager(this);
LayoutManager.setOrientation(RecyclerView.VERTICAL);
recyclerView.setLayoutManager(LayoutManager);
recyclerAdapter = new RecyclerAdapter(cList, listener);
recyclerView.setAdapter(recyclerAdapter);
}
private void setOnClickListener() {
listener = new RecyclerAdapter.RecyclerViewClickListener() {
#Override
public void onClick(View v, int position) {
Intent i = new Intent(CollegeListActivity.this, CollegeDetailsActivity.class);
startActivity(i);
}
};
}
#Override
public void onBackPressed() {
new AlertDialog.Builder(this)
.setMessage("Are you sure you want to exit?")
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
finish();
}
})
.setNegativeButton("No", null)
.show();
}
}
RecyclerAdapter.java
package com.anurag.college_information.adapters;
import android.content.Context;
import android.content.Intent;
import android.telecom.Call;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.anurag.college_information.activities.CollegeDetailsActivity;
import com.anurag.college_information.models.ModelClass;
import com.anurag.college_information.R;
import com.squareup.picasso.Picasso;
import java.util.List;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private List<ModelClass> collegeList ;
private RecyclerViewClickListener listener;
List<String> imageUrl, collegeName, collegeLocation, collegeRating;
public RecyclerAdapter(List<ModelClass> collegeList, RecyclerViewClickListener listener){
this.collegeList=collegeList;
this.listener = listener;
}
#NonNull
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.college_list_single_row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerAdapter.ViewHolder holder, int position) {
String imageLink = collegeList.get(position).getImageLink();
//int img = collegeList.get(position).getCollegeImage();
String cName = collegeList.get(position).getCollegeName();
String cRating = collegeList.get(position).getCollegeRating();
String cLocation = collegeList.get(position).getLocation();
Picasso.get().load(imageLink).into(holder.imageView);
//holder.setData(img, cName, cRating);
holder.setData(imageLink, cName, cLocation ,cRating);
}
#Override
public int getItemCount() {
return collegeList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private ImageView imageView;
private TextView collegeName, collegeRating, collegeLocation;
public ViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.college_image);
collegeName = itemView.findViewById(R.id.college_name);
collegeRating = itemView.findViewById(R.id.college_rating);
collegeLocation = itemView.findViewById(R.id.college_location);
itemView.setOnClickListener(this);
}
public void setData(String imageLink, String cName, String cLocation, String cRating) {
//imageView.setImageResource(img);
Picasso.get().load(imageLink).error(R.drawable.error).into(imageView);
collegeName.setText(cName);
collegeRating.setText(cRating);
collegeLocation.setText(cLocation);
}
#Override
public void onClick(View v) {
listener.onClick(v, getAdapterPosition());
Intent i = new Intent(v.getContext(), CollegeDetailsActivity.class);
i.putExtra("collegeImage", collegeList.get(getAdapterPosition()).getImageLink());
i.putExtra("collegeName", collegeList.get(getAdapterPosition()).getCollegeName());
i.putExtra("collegeRating", collegeList.get(getAdapterPosition()).getCollegeRating());
i.putExtra("collegeLocation", collegeList.get(getAdapterPosition()).getLocation());
v.getContext().startActivity(i);
}
}
public interface RecyclerViewClickListener{
void onClick(View v, int position);
}
}
CollegeDetailsActivity.java
package com.anurag.college_information.activities;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import com.anurag.college_information.R;
import com.squareup.picasso.Picasso;
public class CollegeDetailsActivity extends AppCompatActivity {
Button btnApply;
ImageView dCollegeImage;
TextView dCollegeName, dCollegeRating, dCollegeLocation;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_college_details);
dCollegeImage = findViewById(R.id.details_college_image);
dCollegeName = findViewById(R.id.details_college_name);
dCollegeRating = findViewById(R.id.details_college_rating);
dCollegeLocation = findViewById(R.id.details_college_location);
btnApply = findViewById(R.id.btn_apply);
Intent i = getIntent();
String cn = i.getStringExtra("collegeName");
String cr = i.getStringExtra("collegeRating");
String ci = i.getStringExtra("collegeImage");
String cl = i.getStringExtra("collegeLocation");
Picasso.get().load(ci).error(R.drawable.error).into(dCollegeImage);
dCollegeName.setText(cn);
dCollegeRating.setText(cr);
dCollegeLocation.setText(cl);
btnApply.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "The institute will be notified, of your application", Toast.LENGTH_LONG).show();
Toast.makeText(getApplicationContext(), "The college will contact you, Thank you", Toast.LENGTH_LONG).show();
}
});
}
#Override
public void onBackPressed() {
Intent i = new Intent(CollegeDetailsActivity.this, CollegeListActivity.class);
startActivity(i);
}
}
This is the Error Screenshot:
I'm pretty new to android I've just worked on just 4 to 5 projects,
Any Assistance will be appreciated, Thank You
The commented Out code, is just a normal listview I implemented just In Case, I have to remove the recycler view.

This will probably go away if you don't override onBackPressed in CollegeDetailsActivity. Instead of going back to an activity that had a valid "Title" string extra, the code you posted will go to a new activity where "Title" isn't defined, then get a NullPointerException since courseName will be null in initData (which the error message tells you results in an error on line 81 in that method). Using a null string in a switch results in that type of error
Just remove your onBackPressed entirely in CollegeDetailsActivity.

Android Studio, Screeen To Screen Problem

basically im trying to make it so LoginScreen goes to Category screen .
package Screens;
import androidx.appcompat.app.AppCompatActivity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import com.hr111.User.R;
import Utils.DisplayUtils;
import Utils.PlanUtils;
import Utils.SharedPreferencesUtils;
public class CategoryScreen extends AppCompatActivity {
Button btnExit;
Button btnChemistry;
Button btnBiology;
Button btnPhysics;
TextView textPlayerName;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_category_screen);
btnExit = findViewById(R.id.btnExit);
textPlayerName = findViewById(R.id.textViewName);
btnBiology = findViewById(R.id.btnBiology);
btnPhysics = findViewById(R.id.btnPhysics);
btnChemistry = findViewById(R.id.btnChemistry);
String username = SharedPreferencesUtils.getStringPreference(CategoryScreen.this, "username");
textPlayerName.append(username);
btnBiology.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goToQuestions(btnBiology.getText().toString());
}
});
btnPhysics.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goToQuestions(btnPhysics.getText().toString());
}
});
btnChemistry.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
goToQuestions(btnChemistry.getText().toString());
}
});
btnExit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
DisplayUtils.DisplayScript(CategoryScreen.this, "Exit", "Cikmak Istiyor Musunuz?",
"Hayır", "Evet", null, null);
}
});
}
void goToQuestions(String CategoryName){
SharedPreferencesUtils.settingStringPreference(CategoryScreen.this, "category", CategoryName);
SharedPreferencesUtils.settingIntegerPreference(CategoryScreen.this, "questionCount", 1);
SharedPreferencesUtils.settingIntegerPreference(CategoryScreen.this, "score", 0);
PlanUtils.GoToActivity(CategoryScreen.this, GameScreen.class);
}
}
package Screens;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.hr111.User.MainActivity;
import com.hr111.User.R;
import Utils.DisplayUtils;
import Utils.ExcerciseClass;
import Utils.PlanUtils;
import Utils.SharedPreferencesUtils;
public class LoginScreen extends AppCompatActivity implements View.OnClickListener {
Button btnNext;
TextView username;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login_screen);
btnNext = findViewById(R.id.buttonLogin);
username = findViewById(R.id.plaintextName);
btnNext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String name = username.getText().toString().trim();
if(nameCheck(name))
{
SharedPreferencesUtils.settingStringPreference(LoginScreen.this, "playername", name);
PlanUtils.GoToActivity(LoginScreen.this, CategoryScreen.class);
}
else
{
DisplayUtils.DisplayScript(LoginScreen.this, "ERROR!", "Gecerli bir oyuncu adi seciniz!", null, null, null, null);
}
}
});
}
boolean nameCheck(String name){
if(name == null) return false;
if(name.length() == 0) return false;
return true;
}
#Override
public void onClick(View v) {
}
}
Both screens are in different Classes.
But it simply crashes before LoginScreen can reach to Category Screen. Any clue why this is not working? I have been trying to figure out and i used different variations of codes but all led me to to nothing. I have also tried on a different project but that also led me to nowhere. Thanks in advance

Google sign up pop-up does not appear for choosing accounts

I have made a google sign up button using the link
However, on execution, the pop-up window that usually appears for choosing a google account does not appear.
I have added an onClick option on the google sign-in button and used the function googleSignUp().
Below, I have put code I have used
package com.example.testapplication;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.Window;
import android.widget.ImageView;
import android.widget.Toast;
import com.google.android.gms.auth.api.signin.GoogleSignIn;
import com.google.android.gms.auth.api.signin.GoogleSignInAccount;
import com.google.android.gms.auth.api.signin.GoogleSignInClient;
import com.google.android.gms.auth.api.signin.GoogleSignInOptions;
import com.google.android.gms.common.SignInButton;
import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import java.util.Random;
import java.util.Timer;
import java.util.TimerTask;
public class MainActivity extends AppCompatActivity {
MediaPlayer mp;
int index = R.drawable.picture1_1;
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
private static final int RC_SIGN_IN = 007;
FirebaseAuth mAuth;
#Override
public void onStart() {
super.onStart();
// Check if user is signed in (non-null) and update UI accordingly.
FirebaseUser currentUser = mAuth.getCurrentUser();
updateUI(currentUser);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);//will hide the title
getSupportActionBar().hide(); //hide the title bar
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
SignInButton signInButton = findViewById(R.id.sign_in_button);
signInButton.setSize(SignInButton.SIZE_STANDARD);
final ImageView imageView = findViewById(R.id.imageView);
mp = MediaPlayer.create(this, R.raw.click);
final int resId[] = {R.drawable.picture1_1, R.drawable.picture1_2, R.drawable.picture2_1, R.drawable.picture2_2, R.drawable.picture3_1, R.drawable.picture3_2, R.drawable.picture4_1, R.drawable.picture4_2, R.drawable.picture5_1, R.drawable.picture5_2, R.drawable.picture6_1, R.drawable.picture6_2, R.drawable.picture7_1, R.drawable.picture7_2, R.drawable.picture8_1, R.drawable.picture8_2, R.drawable.picture9_1, R.drawable.picture9_2, R.drawable.picture10_1, R.drawable.picture10_2};
Timer timer = new Timer();
timer.scheduleAtFixedRate(new TimerTask() {
#Override
public void run() {
runOnUiThread(new Runnable() {
#Override
public void run() {
Random rand = new Random();
index = rand.nextInt((resId.length- 1) + 1);
imageView.setImageResource(resId[index]);
}
});
}
}, 300000, 300000);
}
public void Clicked(View view){
Toast.makeText(this,"Hello User",Toast.LENGTH_SHORT).show();
mp.start();
}
public void googleSignUp(View view) {
GoogleSignInClient mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
#Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInClient.getSignInIntent(...);
if (requestCode == RC_SIGN_IN) {
// The Task returned from this call is always completed, no need to attach
// a listener.
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
handleSignInResult(task);
}
}
private void handleSignInResult(Task<GoogleSignInAccount> completedTask) {
try {
GoogleSignInAccount account = completedTask.getResult(ApiException.class);
// Signed in successfully, show authenticated UI.
updateGUI(account);
} catch (ApiException e) {
// The ApiException status code indicates the detailed failure reason.
// Please refer to the GoogleSignInStatusCodes class reference for more information.
Log.w("null", "signInResult:failed code=" + e.getStatusCode());
updateGUI(null);
}
}
private void updateGUI(Object o) {
Toast.makeText(this,"SignUP by google Successful?",Toast.LENGTH_SHORT).show();
}
private void updateUI(FirebaseUser account) {
if(account==null)
Toast.makeText(this,"NULL",Toast.LENGTH_SHORT).show();
else
Toast.makeText(this,"SignUP Successful?",Toast.LENGTH_SHORT).show();
}
}
I am getting no errors but the code does not give the desired result.

In the official documentation example:
https://github.com/firebase/quickstart-android/blob/8262596a009b50b6c99191001f7e5470391bcc4a/auth/app/src/main/java/com/google/firebase/quickstart/auth/java/GoogleSignInActivity.java#L71-L75
The code that declares and configures the GoogleSignInOptions is in the onCreate() method rather than in the class like your example shows. Perhaps instead of
public class MainActivity extends AppCompatActivity {
// you declared it here
public void onCreate() {
// rather than here
}
}
try putting it in the onCreate method
public class MainActivity extends AppCompatActivity {
public void onCreate() {
// declare and build it here
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestEmail()
.build();
}
}

How do I use setResult when returning from an activity?

I need help, I am making a simple application, and I don´t know how to return to the MainActivity the string from the spinner and the name of the person when i click in the "Aceptar" button.
MainActivity.java
package com.example.holaamigos;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.EditText;
import android.widget.Toast;
public class MainActivity extends Activity {
public final static String EXTRA_SALUDO = "com.example.holaamigos.SALUDO";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final EditText txtNombre = (EditText)findViewById(R.id.TxtNombre);
final Button btnHola = (Button)findViewById(R.id.BtnHola);
final CheckBox checkbox1 =(CheckBox)findViewById(R.id.checkBox1);
checkbox1.setOnCheckedChangeListener(new OnCheckedChangeListener(){
#Override
public void onCheckedChanged(CompoundButton arg0,
boolean checked) {
if (checked)
{
Toast.makeText(checkbox1.getContext(), "Activo", Toast.LENGTH_LONG).show();
btnHola.setVisibility(0);
btnHola.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, ActivitySaludo.class);
String saludo = txtNombre.getText().toString();
intent.putExtra(EXTRA_SALUDO, saludo);
startActivity(intent);
}
});
}
else
{
Toast.makeText(checkbox1.getContext(), "Inactivo", Toast.LENGTH_SHORT).show();
btnHola.setVisibility(View.INVISIBLE);
}
}
});
}
public void HobbyReturn(int requestcode, int resultadocode, Intent data) {
if (resultadocode == ActivitySaludo.ACEPTAR_OK); {
String string = data.getStringExtra(ActivitySaludo.ACEPTAR_OK);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
ActivitySaludo
package com.example.holaamigos;
import com.example.holaamigos.R.string;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.Spinner;
import android.widget.TextView;
public class ActivitySaludo extends Activity {
public static final String ACEPTAR_OK = "com.example.holaamigos.ACEPTAR_OK";
String myspinner;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_saludo);
Intent intent = getIntent();
String saludo = intent.getStringExtra(MainActivity.EXTRA_SALUDO);
TextView txtCambiado = (TextView) findViewById(R.id.TxtSaludo);
txtCambiado.setText(getString(R.string.hola_saludo) + " " + saludo);
final Spinner spinner = (Spinner)findViewById(R.id.SpinnerSaludo);
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.hobby, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(new OnItemSelectedListener () {
#Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
parent.getItemAtPosition(pos);
myspinner = spinner.getItemAtPosition(pos).toString();
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
//another call
}
});
final Button BtnAceptar=(Button) findViewById(R.id.buttonAceptar);
BtnAceptar.setOnClickListener(new OnClickListener (){
#Override
public void onClick(View v) {
Intent iboton = new Intent();
iboton.putExtra("HOBBY", myspinner);
setResult(ACEPTAR_OK, iboton);
finish();
}
});
}
}

You need to start your second activity with the flag that you are waiting for a result, so instead of startActivity you need to make use of startActivityForResult.
If you need a little bit more information take a look at this tutorial it should cover all you need to get things working.