Develop Reference

Start activity in another activity in Android

After press SignUp button, Display error : unfortunately app has stopped
LogCat error : java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.lolacupcakes/com.example.lolacupcakes.HomeActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.Button.setOnClickListener(android.view.View$OnClickListener)' on a null object reference
SignUpActivity: Java Code
public class SignUpActivity extends AppCompatActivity {
EditText emailId, password;
Button btnSignUp;
TextView tvSignIn;
FirebaseAuth mFirebaseAuth;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signup);
mFirebaseAuth = FirebaseAuth.getInstance();
emailId = findViewById(R.id.emailIDSignUp);
password = findViewById(R.id.pwdIDSignUp);
btnSignUp = findViewById(R.id.btnIDSignUp);
tvSignIn = findViewById(R.id.textView);
btnSignUp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String email = emailId.getText().toString();
String pwd = password.getText().toString();
if(email.isEmpty())
{
emailId.setError("Please Enter Email Id");
emailId.requestFocus();
}
else if (pwd.isEmpty())
{
password.setError("Please Enter Email Id");
password.requestFocus();
}
else if (email.isEmpty() && pwd.isEmpty())
{
Toast.makeText(SignUpActivity.this, "Fields are Empty",Toast.LENGTH_SHORT).show();
}
else if (!(email.isEmpty() && pwd.isEmpty()))
{
mFirebaseAuth.createUserWithEmailAndPassword(email,pwd).addOnCompleteListener(SignUpActivity.this, new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if (!task.isSuccessful())
{
Toast.makeText(SignUpActivity.this, "SignUp Unsuccessful, Please Try Again",Toast.LENGTH_SHORT).show();
}
else
{
startActivity(new Intent(SignUpActivity.this,HomeActivity.class));
}
}
});
}
else
{
Toast.makeText(SignUpActivity.this, "Error Occurred!",Toast.LENGTH_SHORT).show();
}
}
});
tvSignIn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(SignUpActivity.this, LoginActivity.class);
startActivity(i);
}
});
}
}
SignUpActivity XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".SignUpActivity">
<Button
android:id="#+id/btnIDSignUp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="132dp"
android:text="Sign Up" />
<ImageView
android:id="#+id/imageView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="62dp"
android:src="#drawable/logo_lola" />
<EditText
android:id="#+id/pwdIDSignUp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="206dp"
android:ems="10"
android:hint="Password"
android:inputType="textPassword" />
<EditText
android:id="#+id/emailIDSignUp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="269dp"
android:ems="10"
android:hint="Email"
android:inputType="textEmailAddress" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="87dp"
android:text="Already have an account? Sign in here." />
</RelativeLayout>
HomeActivity Java Code:
public class HomeActivity extends AppCompatActivity {
Button btnlogout;
FirebaseAuth mFirebaseAuth;
private FirebaseAuth.AuthStateListener mAuthStateListener;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
btnlogout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
FirebaseAuth.getInstance().signOut();
Intent intoMain = new Intent(HomeActivity.this, SignUpActivity.class);
startActivity(intoMain);
}
});
}
}
HomeActivityXML:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".HomeActivity">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:text="Welcome"
android:textSize="50dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0" />
<Button
android:id="#+id/btnLogout"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Logout"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
tools:layout_editor_absoluteY="424dp" />
</androidx.constraintlayout.widget.ConstraintLayout>

You missed initializing btnlogout. Add this line in HomeActivity onCreate before setting View.OnClickListener
btnlogout = findViewById(R.id.btnLogout);

You need to create btnSignUp object before setonlicklistener for button
btnSignUp = findViewById(R.id.btnLogout);

You need to create the btnSignUp object before setonclicklistener.

Android Studio button going in to wrong page

In my main page I have 3 different buttons.
Login (loginB)
Create a new account (createB)
Terms of conduct (termsB)
So far it has worked just fine, but for some reason I have now faced a problem with the create new account button. It did go to the right page before but now it goes to a wrong page. It should be going to the CreateAccount -page but it is going to the Menu -page.
I have the java code in the MainActivity were the buttons are here:
public class MainActivity extends AppCompatActivity {
Button loginB;
Button termsB;
Button createB;
EditText emailL,passwordL;
FirebaseAuth fAuth;
ProgressBar progressB;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createB = findViewById(R.id.createB);
createB.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openCreateAccount();
}
});
termsB = findViewById(R.id.termsB);
termsB.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
openTermsOfConduct();
}
});
emailL = findViewById(R.id.emailL);
passwordL = findViewById(R.id.passwordL);
fAuth = FirebaseAuth.getInstance();
loginB = findViewById(R.id.loginB);
progressB = findViewById(R.id.progressB);
loginB.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String email = emailL.getText().toString().trim();
String password = passwordL.getText().toString().trim();
if(TextUtils.isEmpty(email)){
emailL.setError("Email is required.");
return;
}
if(TextUtils.isEmpty(password)){
passwordL.setError("Password is required.");
return;
}
if(password.length() <6){
passwordL.setError("Password must be at least 6 characters.");
}
progressB.setVisibility(View.VISIBLE);
//authenticate the user
fAuth.signInWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
Toast.makeText(MainActivity.this, "Logged in successfully", Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(),Menu.class));
}
else{
Toast.makeText(MainActivity.this, "Error " + task.getException().getMessage(), Toast.LENGTH_SHORT).show();
progressB.setVisibility(View.INVISIBLE);
}
}
});
}
});
}
public void openCreateAccount(){
Intent intent = new Intent(this, CreateAccount.class);
startActivity(intent);
}
public void openTermsOfConduct(){
Intent intent = new Intent(this, TermsOfConduct.class);
startActivity(intent);
}
}
Main Activity xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity"
android:background="#drawable/tausta">
<TextView
android:layout_width="match_parent"
android:layout_height="180dp"
android:fontFamily="sans-serif"
android:paddingVertical="30dp"
android:text="Login"
android:textAlignment="center"
android:textColor="#000"
android:textSize="90sp"
android:layout_marginBottom="25dp"
/>
<EditText
android:id="#+id/emailL"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="30dp"
android:layout_marginBottom="30dp"
android:textColor="#fff"
android:textSize="25sp"
android:hint="Email"
android:textColorHint="#fff"
/>
<EditText
android:id="#+id/passwordL"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginHorizontal="30dp"
android:inputType="textPassword"
android:layout_marginBottom="30dp"
android:textColor="#fff"
android:textSize="25sp"
android:hint="Password"
android:textColorHint="#fff"
/>
<Button
android:id="#+id/loginB"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Login"
android:layout_marginHorizontal="30dp"
android:layout_marginBottom="25dp"
android:background="#drawable/button_bg"
/>
<Button
android:id="#+id/createB"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Create a new account"
android:layout_marginHorizontal="30dp"
android:layout_marginBottom="25dp"
android:background="#drawable/button_bg"
/>
<Button
android:id="#+id/termsB"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Terms and conditions"
android:layout_marginHorizontal="30dp"
android:textColor="#0070ff"
android:textAlignment="center"
android:background="#android:color/transparent"
/>
<ProgressBar
android:id="#+id/progressB"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="invisible"
/>
</LinearLayout>
CreateAccount java:
public class CreateAccount extends AppCompatActivity {
Button registerB;
EditText nameR,emailR,pnumberR,passwordR;
FirebaseAuth fAuth;
ProgressBar progressB;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_create_account2);
nameR = findViewById(R.id.nameR);
emailR = findViewById(R.id.emailR);
pnumberR = findViewById(R.id.pnumberR);
passwordR = findViewById(R.id.passwordR);
progressB = findViewById(R.id.progressB);
fAuth = FirebaseAuth.getInstance();
//check if user registered
if(fAuth.getCurrentUser() != null){
startActivity(new Intent(getApplicationContext(),Menu.class));
finish();
}
registerB = findViewById(R.id.registerB);
registerB.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String email = emailR.getText().toString().trim();
String password = passwordR.getText().toString().trim();
if(TextUtils.isEmpty(email)){
emailR.setError("Email is required.");
return;
}
if(TextUtils.isEmpty(password)){
passwordR.setError("Password is required.");
return;
}
if(password.length() <6){
passwordR.setError("Password must be ata least 6 characters.");
return;
}
progressB.setVisibility(View.VISIBLE);
//register the user to FireBase
fAuth.createUserWithEmailAndPassword(email,password).addOnCompleteListener(new OnCompleteListener<AuthResult>() {
#Override
public void onComplete(#NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
Toast.makeText(CreateAccount.this, "User created.", Toast.LENGTH_SHORT).show();
startActivity(new Intent(getApplicationContext(),Menu.class));
}
else{
Toast.makeText(CreateAccount.this, "Error " +task.getException().getMessage(), Toast.LENGTH_SHORT).show();
}
}
});
}
});
}
}
CreateAccount xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".CreateAccount"
android:background="#drawable/tausta"
>
<TextView
android:layout_width="match_parent"
android:layout_height="100dp"
android:fontFamily="sans-serif"
android:paddingVertical="20dp"
android:text="Create new account"
android:textAlignment="center"
android:textColor="#000"
android:textSize="40sp"
android:layout_marginBottom="25dp"
/>
<EditText
android:id="#+id/nameR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Full name"
android:textColorHint="#fff"
android:textSize="25sp"
android:layout_marginHorizontal="25dp"
android:layout_marginBottom="30dp"
/>
<EditText
android:id="#+id/emailR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Email"
android:textColorHint="#fff"
android:textSize="25sp"
android:layout_marginHorizontal="25dp"
android:layout_marginBottom="30dp"
/>
<EditText
android:id="#+id/pnumberR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Phone number"
android:textColorHint="#fff"
android:textSize="25sp"
android:layout_marginHorizontal="25dp"
android:layout_marginBottom="30dp"
/>
<EditText
android:id="#+id/passwordR"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:hint="Password"
android:textColorHint="#fff"
android:textSize="25sp"
android:layout_marginHorizontal="25dp"
android:layout_marginBottom="30dp"
/>
<Button
android:id="#+id/registerB"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="Register"
android:layout_marginHorizontal="30dp"
android:layout_marginBottom="25dp"
android:background="#drawable/button_bg"
/>
<ProgressBar
android:id="#+id/progressB"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="invisible"
/>
</LinearLayout>

I guess you should definitely check(R.layout.activity_create_account2)and whether it is the correct xml for the CreateAccount.java
P.S. While posting questions, always mention the correct name of the xml too.

The following code might be the cause:
if(fAuth.getCurrentUser() != null){
startActivity(new Intent(getApplicationContext(),Menu.class));
finish();
}
Can you check if it's going into the if block?

Save google profile after google-signin in an activity

I successfully integrated the Google sign-in and successful in showing data in another Activity. But When I am going back to that activity where I passed the data it showing empty screen. I Want to Save user details in Profile Activity. Please help me. Thanks in Advance for a proper Solution. Below are my java files and XML files.
activity_main2.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/activity_main3"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".Main2Activity">
<LinearLayout
android:id="#+id/prof_section"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="20dp"
android:layout_marginTop="50dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/prof_pic"
android:layout_width="90dp"
android:layout_height="125dp"
android:src="#drawable/profilep" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="28dp"
android:layout_marginTop="20dp"
android:orientation="vertical">
<TextView
android:id="#+id/name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Disply Name Here"
android:textSize="18dp"
android:textStyle="bold" />
<TextView
android:id="#+id/email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:gravity="center"
android:text="Disply Email Here"
android:textSize="18dp"
android:textStyle="bold" />
<Button
android:id="#+id/butn_logout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Logout"/>
</LinearLayout>
</LinearLayout>
<com.google.android.gms.common.SignInButton
android:id="#+id/butn_login"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:layout_marginRight="50dp"
android:layout_marginTop="60dp" >
</com.google.android.gms.common.SignInButton>
activity_profile.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".Profile">
<ImageView
android:id="#+id/dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
<TextView
android:id="#+id/name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
<TextView
android:id="#+id/email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="10dp" />
<Button
android:id="#+id/button_save"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="SAVE" />
Profile.Java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profile);
dp = (ImageView) findViewById(R.id.dp);
name = (TextView) findViewById(R.id.name);
email = (TextView) findViewById(R.id.email);
Intent i = getIntent();
final String i_name, i_email, i_url;
i_name = i.getStringExtra("p_name");
i_email = i.getStringExtra("p_email");
i_url = i.getStringExtra("p_url");
name.setText(i_name);
email.setText(i_email);
new Thread(new Runnable() {
#Override
public void run() {
try {
URL url = new URL(i_url);
InputStream is = url.openConnection().getInputStream();
final Bitmap bmp = BitmapFactory.decodeStream(is);
runOnUiThread(new Runnable() {
#Override
public void run() {
dp.setImageBitmap(bmp);
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}).start();
}
Main2Activity.Java
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
preferenceConfig = new SharedPreferenceConfig(getApplicationContext());
if (preferenceConfig.readLoginStatus()) {
startActivity(new Intent(this, Main3Activity.class));
finish();
}
Prof_Section = (LinearLayout) findViewById(R.id.prof_section);
SignOut = (Button) findViewById(R.id.butn_logout);
SignIn = (SignInButton) findViewById(R.id.butn_login);
Name = (TextView) findViewById(R.id.name);
Email = (TextView) findViewById(R.id.email);
Prof_Pic = (ImageView) findViewById(R.id.prof_pic);
SignIn.setOnClickListener(this);
SignOut.setOnClickListener(this);
Prof_Section.setVisibility(View.GONE);
GoogleSignInOptions signInOptions = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).requestEmail().requestProfile().build();
googleApiClient = new GoogleApiClient.Builder(this).enableAutoManage(this, this).addApi(Auth.GOOGLE_SIGN_IN_API, signInOptions).build();
}
#Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.butn_login:
signIn();
break;
case R.id.butn_logout:
signOut();
break;
}
}
#Override
public void onConnectionFailed(#NonNull ConnectionResult connectionResult) {
}
private void signIn() {
Intent intent = Auth.GoogleSignInApi.getSignInIntent(googleApiClient);
startActivityForResult(intent, REQ_CODE);
}
private void signOut() {
Auth.GoogleSignInApi.signOut(googleApiClient).setResultCallback(new ResultCallback<Status>() {
#Override
public void onResult(#NonNull Status status) {
updateUI(false);
}
});
}
private void updateUI(boolean isLogin) {
if (isLogin) {
Prof_Section.setVisibility(View.VISIBLE);
SignIn.setVisibility(View.GONE);
} else {
Prof_Section.setVisibility(View.GONE);
SignIn.setVisibility(View.VISIBLE);
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == REQ_CODE) {
GoogleSignInResult googleSignInResult = Auth.GoogleSignInApi.getSignInResultFromIntent(data);
GoogleSignInAccount account = googleSignInResult.getSignInAccount();
String name = account.getDisplayName();
String email = account.getEmail();
String img_url = account.getPhotoUrl().toString();
Name.setText(name);
Email.setText(email);
Glide.with(this).load(img_url).into(Prof_Pic);
updateUI(true);
preferenceConfig.writeLoginStatus(true);
try {
Intent sendData = new Intent(Main2Activity.this, Profile.class);
name = account.getDisplayName();
email = account.getEmail();
img_url = account.getPhotoUrl().toString();
sendData.putExtra("p_name", name);
sendData.putExtra("p_email", email);
sendData.putExtra("p_url", img_url);
startActivity(sendData);
} catch (Exception e) {
Toast.makeText(Main2Activity.this, e.getMessage(), Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(Main2Activity.this, "Login Failed", Toast.LENGTH_SHORT).show();
}
}

Instead of passing the data to the Profile activity use the GoogleSignIn.getLastSignedInAccount(getActivity()); method to get user profile data.
Replace your,
Intent i = getIntent();
final String i_name, i_email, i_url;
i_name = i.getStringExtra("p_name");
i_email = i.getStringExtra("p_email");
i_url = i.getStringExtra("p_url");
with the following code,
GoogleSignInAccount acct = GoogleSignIn.getLastSignedInAccount(getActivity());
if (acct != null) {
String i_name = acct.getDisplayName();
String i_email = acct.getEmail();
Uri i_url = acct.getPhotoUrl();
}
For more information check this documentation

How to get value from Radiogroup and change in database

I am working on an application in android studio with firebase where the user can change user settings such as name, phone number and bio.
I also need the ability to change a selected radio group button value.
The Settings activity class is as follows
public class SettingsActivity extends AppCompatActivity {
private EditText mNameField, mPhoneField, mBio;
private Button mBack, mConfirm;
private RadioGroup mSport;
private ImageView mProfileImage;
private FirebaseAuth mAuth;
private DatabaseReference mUserDatabase;
private String userId, name, phone, bio, sport, profileImageUrl, userSex;
private Uri resultUri;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_settings);
mNameField = (EditText) findViewById(R.id.name);
mPhoneField = (EditText) findViewById(R.id.phone);
mBio = (EditText) findViewById(R.id.bio);
mSport = (RadioGroup) findViewById(R.id.sport);
mProfileImage = (ImageView) findViewById(R.id.profileImage);
mBack = (Button) findViewById(R.id.back);
mConfirm = (Button) findViewById(R.id.confirm);
mAuth = FirebaseAuth.getInstance();
userId = mAuth.getCurrentUser().getUid();
mUserDatabase = FirebaseDatabase.getInstance().getReference().child("Users").child(userId);
getUserInfo();
mProfileImage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(Intent.ACTION_PICK);
intent.setType("image/*");
startActivityForResult(intent, 1);
}
});
mConfirm.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
saveUserInformation();
}
});
mBack.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
finish();
return;
}
});
}
private void getUserInfo() {
mUserDatabase.addListenerForSingleValueEvent(new ValueEventListener() {
#RequiresApi(api = Build.VERSION_CODES.O)
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
if(dataSnapshot.exists() && dataSnapshot.getChildrenCount()>0){
Map<String, Object> map = (Map<String, Object>) dataSnapshot.getValue();
if(map.get("name")!=null){
name = map.get("name").toString();
mNameField.setText(name);
}
if(map.get("phone")!=null){
phone = map.get("phone").toString();
mPhoneField.setText(phone);
}
if(map.get("bio")!=null){
bio = map.get("bio").toString();
mBio.setText(bio);
}
if(map.get("sport")!=null){
}
if(map.get("sex")!=null){
userSex = map.get("sex").toString();
}
if(map.get("sport") !=null){
}
Glide.clear(mProfileImage);
if(map.get("profileImageUrl")!=null){
profileImageUrl = map.get("profileImageUrl").toString();
switch(profileImageUrl){
case "default":
Glide.with(getApplication()).load(R.mipmap.default_app_image).into(mProfileImage);
break;
default:
Glide.with(getApplication()).load(profileImageUrl).into(mProfileImage);
break;
}
}
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
}
private void saveUserInformation() {
name = mNameField.getText().toString();
phone = mPhoneField.getText().toString();
bio = mBio.getText().toString();
int selectSport = mSport.getCheckedRadioButtonId();
final RadioButton sportButton = (RadioButton) findViewById(selectSport);
if(sportButton.getText() == null){
return;
}
Map userInfo = new HashMap();
userInfo.put("name", name);
userInfo.put("phone", phone);
userInfo.put("bio", bio);
userInfo.put("sport",sport);
mUserDatabase.updateChildren(userInfo);
if(resultUri != null){
StorageReference filepath = FirebaseStorage.getInstance().getReference().child("profileImages").child(userId);
Bitmap bitmap = null;
try {
bitmap = MediaStore.Images.Media.getBitmap(getApplication().getContentResolver(), resultUri);
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, baos);
byte[] data = baos.toByteArray();
UploadTask uploadTask = filepath.putBytes(data);
uploadTask.addOnFailureListener(new OnFailureListener() {
#Override
public void onFailure(#NonNull Exception e) {
finish();
}
});
uploadTask.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
#Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Uri downloadUrl = taskSnapshot.getDownloadUrl();
Map userInfo = new HashMap();
userInfo.put("profileImageUrl", downloadUrl.toString());
mUserDatabase.updateChildren(userInfo);
finish();
return;
}
});
}else{
finish();
}
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == 1 && resultCode == Activity.RESULT_OK){
final Uri imageUri = data.getData();
resultUri = imageUri;
mProfileImage.setImageURI(resultUri);
}
}
and the XML file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.wk001764.finalproject.SettingsActivity"
android:orientation="vertical">
<ImageView
android:id="#+id/profileImage"
android:layout_width="200sp"
android:layout_height="200sp"
android:layout_gravity="center"
android:layout_marginBottom="20sp"
android:src="#mipmap/default_app_image" />
<EditText
android:id="#+id/name"
android:layout_width="398dp"
android:layout_height="wrap_content"
android:layout_marginBottom="20sp"
android:background="#null"
android:hint="Name" />
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/phone"
android:background="#null"
android:hint="Phone Number"
android:layout_marginBottom="20sp"
android:inputType="phone"/>
<EditText
android:id="#+id/bio"
android:layout_width="398dp"
android:layout_height="wrap_content"
android:layout_marginBottom="20sp"
android:background="#null"
android:hint="Bio" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:text="Please Select the sport you want to change to:"/>
<RadioGroup
android:id="#+id/sport"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioButton
android:id="#+id/badminton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Badminton" />
<RadioButton
android:id="#+id/basketball"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Basketball" />
<RadioButton
android:id="#+id/boxing"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Boxing" />
<RadioButton
android:id="#+id/cricket"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Cricket" />
<RadioButton
android:id="#+id/football"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Football" />
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:orientation="vertical">
<RadioButton
android:id="#+id/golf"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Golf" />
<RadioButton
android:id="#+id/hockey"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Hockey" />
<RadioButton
android:id="#+id/rugby"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Rugby" />
<RadioButton
android:id="#+id/swimming"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Swimming" />
<RadioButton
android:id="#+id/tennis"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Tennis" />
</LinearLayout>
</LinearLayout>
</RadioGroup>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/confirm"
android:text="Save"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/back"
android:text="Back"/>
</LinearLayout>
How would I get the new selected value of the radio group and save it to the database?

You should be able to do something like this:
int radioButtonId = mSport.getCheckedRadioButtonId();
View radioButton = mSport.findViewById(radioButtonId);
int idx = mSport.indexOfChild(radioButton);
To get selected RadioButton Text in a RadioGroup, please use the following code:
RadioButton rb = (RadioButton) mSport.getChildAt(idx);
String selectedText = rb.getText().toString();
But note, this code will work only if the radio buttons are direct children of your RadioGroup. So you need to remove those "LinearLayouts". In fact, there is no need to use those layouts at all. You can set the orientation of your RadioGroup to "vertical", in your .XML file, using the following line of code:
android:orientation="vertical"

Android app is crashing after clicking button

Android Studio is showing open app again app-crash when I click sign up button
The app is running fine but when I click the sign up button it crashes, also want to start new activity after sign up but the error is com
I think there is some problem with button click listener or validation code but don't know where this error is coming from.
following is my java file code:
public class SignUp extends AppCompatActivity {
private static final String TAG = "SignUp";
private Vibrator vib;
Animation animShake;
private EditText signupInputName, signupInputEmail, signupInputPassword, signupInputDOB;
private TextInputLayout signupInputLayoutName, signupInputLayoutEmail, signupInputLayoutPasword, signupInputLayoutDOB;
private Button btnSignUp;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.sign_up_form);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_name);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_email);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_Password);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_DOB);
signupInputName = (EditText) findViewById(R.id.signup_input_name);
signupInputName = (EditText) findViewById(R.id.signup_input_email);
signupInputName = (EditText) findViewById(R.id.signup_input_Password);
signupInputName = (EditText) findViewById(R.id.signup_input_DOB);
btnSignUp = (Button) findViewById(R.id.btn_signUp);
animShake = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.shake);
vib = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
btnSignUp.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
register();
}
});
}
public void register() {
submitForm();
{
if (!checkName() || !checkEmail() || !checkDOB() || !checkPassword()) {
Toast.makeText(this, "signup failed", Toast.LENGTH_SHORT).show();
} else {
onSignupSuccess();
}
}
}
public void onSignupSuccess() {
Intent intent = new Intent(SignUp.this, tab1Petrol.class);
startActivity(intent);
finish();
}
private void submitForm() {
if (!checkName()) {
signupInputName.setAnimation(animShake);
signupInputName.startAnimation(animShake);
vib.vibrate(125);
return;
}
if (!checkEmail()) {
signupInputEmail.setAnimation(animShake);
signupInputEmail.startAnimation(animShake);
vib.vibrate(125);
return;
}
if (!checkPassword()) {
signupInputPassword.setAnimation(animShake);
signupInputPassword.startAnimation(animShake);
vib.vibrate(125);
return;
}
if (!checkDOB()) {
signupInputDOB.setAnimation(animShake);
signupInputDOB.startAnimation(animShake);
vib.vibrate(125);
return;
}
signupInputLayoutName.setErrorEnabled(false);
signupInputLayoutEmail.setErrorEnabled(false);
signupInputLayoutPasword.setErrorEnabled(false);
signupInputLayoutDOB.setErrorEnabled(false);
Toast.makeText(this, "you are successfully Registered", Toast.LENGTH_SHORT).show();
}
private boolean checkName() {
if (signupInputName.getText().toString().trim().isEmpty()) {
signupInputLayoutName.setErrorEnabled(true);
signupInputLayoutName.setError("Please enter a Name");
signupInputName.setError("valid Input Required");
return false;
}
signupInputLayoutName.setErrorEnabled(false);
return true;
}
private boolean checkEmail() {
String email = signupInputEmail.getText().toString().trim();
if (email.isEmpty() || !isValidEmail(email)) {
signupInputLayoutEmail.setErrorEnabled(true);
signupInputLayoutEmail.setError("Please enter a Valid Email");
signupInputEmail.setError("valid Input Required");
requestFocus(signupInputEmail);
return false;
}
signupInputLayoutEmail.setErrorEnabled(false);
return true;
}
private boolean checkPassword() {
if (signupInputPassword.getText().toString().trim().isEmpty()) {
signupInputLayoutPasword.setError("Please enter password");
requestFocus(signupInputPassword);
return false;
}
signupInputLayoutPasword.setErrorEnabled(false);
return true;
}
private boolean checkDOB() {
try {
boolean isDateValid = false;
String[] s = signupInputDOB.getText().toString().split("/");
int date = Integer.parseInt(s[0]);
int month = Integer.parseInt(s[1]);
if (date < 32 && month < 13)
isDateValid = true;
if (signupInputDOB.getText().toString().trim().isEmpty() && isDateValid) {
signupInputLayoutDOB.setError("Enter a valid D.O.B");
requestFocus(signupInputDOB);
signupInputDOB.setError("valid input required");
return false;
}
} catch (Exception ex) {
signupInputLayoutDOB.setError("Enter a valid D.O.B");
requestFocus(signupInputDOB);
return false;
}
signupInputDOB.setError(null);
return true;
}
private static boolean isValidEmail(String email) {
return !TextUtils.isEmpty(email) && Patterns.EMAIL_ADDRESS.matcher(email).matches();
}
private void requestFocus(View view) {
if (view.requestFocus()) {
getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_VISIBLE);
}
}
}
XML file code:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_gravity="center">
<android.support.design.widget.TextInputLayout
android:id="#+id/sign_up_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<EditText
android:id="#+id/signup_input_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:hint="#string/name" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="#+id/sign_up_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<EditText
android:id="#+id/signup_input_email"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textEmailAddress"
android:hint="Email" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="#+id/sign_up_Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<EditText
android:id="#+id/signup_input_Password"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:inputType="textPassword"
android:hint="Password" />
</android.support.design.widget.TextInputLayout>
<android.support.design.widget.TextInputLayout
android:id="#+id/sign_up_DOB"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true">
<EditText
android:id="#+id/signup_input_DOB"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10"
android:maxLines="1"
android:hint="Date of Birth" />
</android.support.design.widget.TextInputLayout>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/gender_textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I am"
android:fontFeatureSettings="Password"
android:textSize="20dp"
android:fontFamily="Password"/>
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/gender_textView"
android:orientation="horizontal">
<RadioButton
android:id="#+id/male_radio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Male"
android:checked="true"/>
<RadioButton
android:id="#+id/Female_radio"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Female"/>
</RadioGroup>
</RelativeLayout>
<Button
android:id="#+id/btn_signUp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimaryDark"
android:text="Sign Up"
android:textColor="#android:color/white" />
</LinearLayout>
</LinearLayout>

Well for starters you are re-assigning the Input fields here, overwriting the previous one... I'm pretty sure the issue is because of this.
signupInputName = (EditText) findViewById(R.id.signup_input_name);
signupInputName = (EditText) findViewById(R.id.signup_input_email);
signupInputName = (EditText) findViewById(R.id.signup_input_Password);
signupInputName = (EditText) findViewById(R.id.signup_input_DOB);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_name);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_email);
signupInputLayoutName = (TextInputLayout) findViewById(R.id.sign_up_DOB);
The very first thing your code does after onCreate() is checkEmail(), and as I stated above, there is no R.id.signup_input_email assigned to signupInputEmail.
Your code will throw an exception here since checkEmail() refers to a NULL variable.
if (!checkEmail()) { ... }