我正在尝试在Android中集成由firebase auth提供的google登录。我所做的一切与firebase文档中给出的相同。当用户选择要登录的帐户时，应用停止并在下面给出的log cat窗口中显示错误。
Caused by: java.lang.NullPointerException: Attempt to invoke virtual
method 'com.google.android.gms.tasks.Task com.google.firebase.auth.FirebaseAuth.signInWithCredential(com.google.firebase.auth.AuthCredential)' on a null object reference
at com.app.bookbudi.Login.firebaseAuthWithGoogle(Login.java:99)
at com.app.bookbudi.Login.onActivityResult(Login.java:86)
这是我的代码：
Login.java
public class Login extends AppCompatActivity {
SignInButton signIn;
GoogleSignInClient mGoogleSignInClient;
private static final int RC_SIGN_IN = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
signIn = findViewById(R.id.signIn);
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN).
requestIdToken(getString(R.string.default_web_client_id)).requestEmail().build();
mGoogleSignInClient = GoogleSignIn.getClient(this,gso);
signIn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_SIGN_IN);
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable 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){
Toast.makeText(getApplicationContext(),"Login failed",TastyToast.LENGTH_SHORT).show();
}
}
}
private void firebaseAuthWithGoogle(GoogleSignInAccount acct){
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(),null);
fAuth.signInWithCredential(credential).addOnCompleteListener(this,new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if(task.isSuccessful()){
Intent i = new Intent(Login.this,MainActivity.class);
startActivity(i);
finish();
}
else{
Toast.makeText(getApplicationContext(),"Unable to login with google.",TastyToast.LENGTH_SHORT).show();
}
}
});
}
}
请让我知道我在上面的代码中做错了什么。
谢谢
您没有初始化Firebase身份验证。
SignInButton signIn;
GoogleSignInClient mGoogleSignInClient;
private static final int RC_SIGN_IN = 1;
//Add Firebase Auth
private FirebaseAuth fAuth;
在此onCreate
fAuth = FirebaseAuth.getInstance();
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