也许任何人仍在寻找解决方案：
在Activity（yourLoginActivity。类）
*创建一个恒定的int表示ActivityForResult
的requestCode
// You can change to any Value just be unique
private static final int RC_SIGN_IN = 1001;
- >声明GoogleApiClient，FirebaseAuth，AuthStateListener和CallbackManager
private static final String TAG = "LoginActivity";
private static final int RC_SIGN_IN = 1001;
private GoogleApiClient mGoogleApiClient;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private CallbackManager mCallbackManager;
- >初始化上述所声明的变量：
mCallbackManager = CallbackManager.Factory.create(); mAuth = FirebaseAuth.getInstance(); mAuthListener = new FirebaseAuth.AuthStateListener() {
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth) {
FirebaseUser user = firebaseAuth.getCurrentUser();
if (user != null) {
// User is signed in
Log.d(TAG, "onAuthStateChanged:signed_in:" + user.getUid());
} else {
// User is signed out
Log.d(TAG, "onAuthStateChanged:signed_out");
}
} };
- >请参考Si ngInButton和LoginButton：
LoginButton facebookLoginButton = findViewById(R.id.login_facebook_button);
SignInButton mGoogleSignInButton = findViewById(R.id.sign_in_button);
- >处理的SingInButton和LoginButton：
facebookLoginButton.setReadPermissions("email", "public_profile", "user_birthday");
facebookLoginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
firebaseAuthWithFacebook(loginResult.getAccessToken());
}
@Override
public void onCancel() {
Toast.makeText(LoginActivity.this, "Succes", Toast.LENGTH_SHORT).show();
}
@Override
public void onError(FacebookException error) {
Toast.makeText(LoginActivity.this, "Succes", Toast.LENGTH_SHORT).show();
}
});
mGoogleSignInButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
signIn();
}
});
- >管理GoogleSingInOptions和GoogleApiClient
GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestEmail()
.build();
mGoogleApiClient = new GoogleApiClient.Builder(this)
.enableAutoManage(this /* FragmentActivity */, this /* OnConnectionFailedListener */)
.addApi(Auth.GOOGLE_SIGN_IN_API, gso)
.build();
- >处理Facebook的登录
private void authWithFacebook(AccessToken token) {
Log.d(TAG, "handleFacebookAccessToken:" + token);
final AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
if (mAuth.getCurrentUser() != null) {
mAuth.getCurrentUser().linkWithCredential(credential)
.addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
e.printStackTrace();
Log.e(TAG, "onFailure: " + e.getMessage());
mAuth.signInWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
}
});
}
});
} else {
mAuth.signInWithCredential(credential);
}
}
- >处理的谷歌登录：
pprivate void authWithGoogle(final GoogleSignInAccount acct) {
Log.d(TAG, "firebaseAuthWithGooogle:" + acct.getId());
final AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
if (mAuth.getCurrentUser() != null) {
mAuth.getCurrentUser().linkWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
e.printStackTrace();
Log.e(TAG, "onFailure: " + e.getMessage());
mAuth.signInWithCredential(credential).addOnSuccessListener(new OnSuccessListener<AuthResult>() {
@Override
public void onSuccess(AuthResult authResult) {
Toast.makeText(LoginActivity.this, "Logged IN", Toast.LENGTH_LONG).show();
}
});
}
});
}else{
mAuth.signInWithCredential(credential);
}
}
- >重写onConnectionFailed（）：
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
// An unresolvable error has occurred and Google APIs (including Sign-In) will not
// be available.
Log.d(TAG, "onConnectionFailed:" + connectionResult);
Toast.makeText(this, "Google Play Services error.", Toast.LENGTH_SHORT).show();
}
- >歌唱和调用onActivityForResult（）
private void signIn() {
Intent signInIntent = Auth.GoogleSignInApi.getSignInIntent(mGoogleApiClient);
startActivityForResult(signInIntent, RC_SIGN_IN);
}
- >实施GoogleApiClient.OnConnectionFailedListener
LoginActivity extends AppCompatActivity implements GoogleApiClient.OnConnectionFailedListener{
....
}
请确保你有ENABLED FACEBOOK SDK从FIREBASE控制台登录并正确设置！
您发布的代码不是抛出异常的代码。当您调用'mAuth.addAuthStateListener（mAuthListener）'和'mAuth'为空时会发生异常。在尝试添加侦听器之前，请确认您已经执行了'mAuth = FirebaseAuth.getInstance（）'。 –
就像在firebase教程中，你所指的那一行：'mAuth = FirebaseAuth.getInstance（）'在我的代码片段中。它在onCreate中被调用。在onStart中调用'mAuth.addAuthStateListener（mAuthListener）;'。 – Tim