问题
I have this mistake when I log in with Google
com.google.firebase.database.DatabaseException: Failed to get FirebaseDatabase instance: Specify DatabaseURL within FirebaseApp or from your getInstance() call.
at com.google.firebase.database.FirebaseDatabase.getInstance(com.google.firebase:firebase-database@@16.0.5:114)
at com.google.firebase.database.FirebaseDatabase.getInstance(com.google.firebase:firebase-database@@16.0.5:71)
at pl.cyfrogen.budget.ui.signin.SignInActivity.updateUI(SignInActivity.java:145)
at pl.cyfrogen.budget.ui.signin.SignInActivity.access$400(SignInActivity.java:41)
at pl.cyfrogen.budget.ui.signin.SignInActivity$3.onComplete(SignInActivity.java:130)
at com.google.android.gms.tasks.zzj.run(Unknown Source:4)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.app.ActivityThread.main(ActivityThread.java:8167)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:496)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1100)
enter image description here
public class SignInActivity extends AppCompatActivity {
private static final int RC_SIGN_IN = 123;
private FirebaseAuth mAuth;
private GoogleSignInClient mGoogleSignInClient;
private TextView errorTextView;
private SignInButton signInButton;
private View progressView;
private TextView privacyPolicyTextView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_signin);
progressView = findViewById(R.id.progress_view);
mAuth = FirebaseAuth.getInstance();
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
signInButton = findViewById(R.id.sign_in_button);
signInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
signIn();
signInButton.setEnabled(false);
errorTextView.setText("");
}
});
privacyPolicyTextView = findViewById(R.id.privacy_policy_text_view);
SpannableStringBuilder spanTxt = new SpannableStringBuilder(
"By signing in, you are indicating that you have read and agree to the ");
spanTxt.append("privacy policy");
spanTxt.setSpan(new ClickableSpan() {
@Override
public void onClick(@NonNull View widget) {
Intent browserIntent = new Intent(Intent.ACTION_VIEW,
Uri.parse(Links.PRIVACY_POLICY_LINK));
startActivity(browserIntent);
}
}, spanTxt.length() - "privacy policy".length(), spanTxt.length(), 0);
privacyPolicyTextView.setMovementMethod(LinkMovementMethod.getInstance());
privacyPolicyTextView.setText(spanTxt, TextView.BufferType.SPANNABLE);
errorTextView = findViewById(R.id.error_textview);
}
@Override
public void onStart() {
super.onStart();
showProgressView();
FirebaseUser currentUser = mAuth.getCurrentUser();
updateUI(currentUser);
}
private void signIn() {
showProgressView();
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == RC_SIGN_IN) {
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try {
GoogleSignInAccount account = task.getResult(ApiException.class);
firebaseAuthWithGoogle(account);
} catch (ApiException e) {
e.printStackTrace();
hideProgressView();
loginError("Google sign in failed.");
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount acct) {
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
FirebaseUser user = mAuth.getCurrentUser();
updateUI(user);
} else {
loginError("Firebase auth failed.");
hideProgressView();
}
}
});
}
private void updateUI(FirebaseUser currentUser) {
if (currentUser == null) {
progressView.setVisibility(View.GONE);
return;
}
showProgressView();
final DatabaseReference userReference = FirebaseDatabase.getInstance().getReference("users").child(currentUser.getUid());
userReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
User user = dataSnapshot.getValue(User.class);
if (user != null) {
startActivity(new Intent(SignInActivity.this, MainActivity.class));
finish();
} else {
runTransaction(userReference);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
loginError("Firebase fetch user data failed.");
hideProgressView();
}
});
}
private void loginError(String text) {
errorTextView.setText(text);
signInButton.setEnabled(true);
}
private void runTransaction(DatabaseReference userReference) {
showProgressView();
userReference.runTransaction(new Transaction.Handler() {
@Override
public Transaction.Result doTransaction(MutableData mutableData) {
User user = mutableData.getValue(User.class);
if (user == null) {
mutableData.setValue(new User());
return Transaction.success(mutableData);
}
return Transaction.success(mutableData);
}
@Override
public void onComplete(DatabaseError databaseError, boolean committed,
DataSnapshot dataSnapshot) {
if (committed) {
startActivity(new Intent(SignInActivity.this, MainActivity.class));
finish();
} else {
errorTextView.setText("Firebase create user transaction failed.");
hideProgressView();
}
}
});
}
private void showProgressView() {
progressView.setVisibility(View.VISIBLE);
}
private void hideProgressView() {
progressView.setVisibility(View.GONE);
}
@Override
public void onBackPressed() {
moveTaskToBack(true);
}
}
回答1:
It looks like you're configuring Firebase without specifying the URL of the Realtime Database. There are a few reasons this could be happening:
If you are providing the configuration data in code, be sure to call setDatabaseUrl on your options.
If you are providing the configuration data through the
GoogleServices.jsonfile, be sure to download a new version of that file after you create the database in the Firebase console.This is a new requirement (since a few weeks ago) as the Realtime Database is now created on-demand (instead of auto-created when the project is created), so that you can pick in what region it's created.
回答2:
Seems like you didn't connect your app to firebase. You should:
- connect your app to firebase
- add Firebase Authentication to your project
You are also using Firebase Database. Connect it to your project.
After all, change this code
final DatabaseReference userReference = FirebaseDatabase.getInstance().getReference("users").child(currentUser.getUid());
to this:
final DatabaseReference rootRef = FirebaseDatabase.getInstance().getReference();
final DatabaseReference userReference = rootRef.child("users").child(currentUser.getUid());
To conclude, as Frank mentioned, do not forget to download your google-services.json file and add it into the module (app-level) directory of your app
来源：https://stackoverflow.com/questions/65348685/firebase-i-get-in-trouble-when-i-sign-in-with-google