Android Studio - Firebase 在尝试签署 facebook 或 google 时返回 null
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【中文标题】Android Studio - Firebase 在尝试签署 facebook 或 google 时返回 null【英文标题】：Android Studio - Firebase returns null when trying to sign facebook or google 【发布时间】：2018-10-20 08:32:49 【问题描述】：当我尝试使用 Facebook 或 Google 登录 Firebase 时，我的应用程序崩溃了，因为它没有使用 Firebase 创建新用户CreateNewUser().
Logcat：-
05-10 09:11:58.180 16986-16986/com.example.sefi.authenticationproject E/VideoAdapter: onCreateViewHolder() >> 05-10 09:11:58.191 16986-16986/com.example.sefi.authenticationproject E/VideoAdapter: onCreateViewHolder() > 0 05-10 09:11:58.203 16986-16986/com.example.sefi.authenticationproject E/androidRuntime: FATAL EXCEPTION: main 进程：com.example.sefi.authenticationproject，PID：16986 java.lang.NullPointerException：尝试在空对象引用上调用虚拟方法“java.lang.String java.lang.Object.toString()” 在 com.example.sefi.authenticationproject.adapter.VideoAdapter.onBindViewHolder(VideoAdapter.java:114) 在 com.example.sefi.authenticationproject.adapter.VideoAdapter.onBindViewHolder(VideoAdapter.java:32) 在 android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6482) 在 android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6515) 在 android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5458) 在 android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5724) 在 android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5563) 在 android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5559) 在 android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2229) 在 android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1556) 在 android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1516) 在 android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:608) 在 android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3693) 在 android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3410) 在 android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:3962) 在 android.view.View.layout(View.java:18799) 在 android.view.ViewGroup.layout(ViewGroup.java:5952) 在 android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java:1855) 在 android.view.View.layout(View.java:18799) 在 android.view.ViewGroup.layout(ViewGroup.java:5952) 在 android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 在 android.widget.FrameLayout.onLayout(FrameLayout.java:261) 在 android.view.View.layout(View.java:18799) 在 android.view.ViewGroup.layout(ViewGroup.java:5952) 在 android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741) 在 android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585) 在 android.widget.LinearLayout.onLayout(LinearLayout.java:1494) 在 android.view.View.layout(View.java:18799) 在 android.view.ViewGroup.layout(ViewGroup.java:5952) 在 android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) 在 android.widget.FrameLayout.onLayout(FrameLayout.java:261) 在 com.android.internal.policy.DecorView.onLayout(DecorView.java:822) 在 android.view.View.layout(View.java:18799) 在 android.view.ViewGroup.layout(ViewGroup.java:5952) 在 android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2634) 在 android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2350) 在 android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1509) 在 android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7051) 在 android.view.Choreographer$CallbackRecord.run(Choreographer.java:927) 在 android.view.Choreographer.doCallbacks(Choreographer.java:702) 在 android.view.Choreographer.doFrame(Choreographer.java:638) 在 android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:913) 在 android.os.Handler.handleCallback(Handler.java:751) 在 android.os.Handler.dispatchMessage(Handler.java:95) 在 android.os.Looper.loop(Looper.java:154) 在 android.app.ActivityThread.main(ActivityThread.java:6692) 在 java.lang.reflect.Method.invoke（本机方法） 在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1468) 在 com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1358)
LogInActivity.java
public class LogInActivity extends Activity
public static final String TAG = "LogInActivity";
private static final int RC_GOOGLE_SIGN_IN = 1001;
private FirebaseAuth mAuth;
private FirebaseAuth.AuthStateListener mAuthListener;
private CallbackManager mCallbackManager;
private AccessTokenTracker mAccessTokenTracker;
private GoogleSignInClient mGoogleSignInClient;
private EditText mEmail;
private EditText mPass;
private TextView mStatus;
private boolean mIsSignup;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.log_in_activity);
mEmail = findViewById(R.id.email_id);
mPass = findViewById(R.id.password_id);
mStatus = findViewById(R.id.status_id);
firebaseAuthenticationInit();
googleSigninInit();
facebookLoginInit();
@Override
protected void onStart()
Log.e(TAG, "onStart() >>");
super.onStart();
mAuth.addAuthStateListener(mAuthListener);
updateLoginStatus("N.A");
Log.e(TAG, "onStart() <<");
@Override
protected void onStop()
Log.e(TAG, "onStop() >>");
super.onStop();
if (mAuthListener != null)
mAuth.removeAuthStateListener(mAuthListener);
Log.e(TAG, "onStop() <<");
public void onEmailPasswordAuthClick(View V)
Log.e(TAG, "onEmailPasswordAuthClick() >>");
String email = mEmail.getText().toString();
String pass = mPass.getText().toString();
Task<AuthResult> authResult;
boolean canContinue = checkIfEmailOrPasswordIsRequired(email, pass);
if (canContinue == true)
switch (V.getId())
case R.id.sign_in_id:
//Email / Password sign-in
authResult = mAuth.signInWithEmailAndPassword(email, pass);
moveToNextScreenAfterValidation(authResult);
mIsSignup = false;
break;
case R.id.sign_up_id:
//Email / Password sign-up
authResult = mAuth.createUserWithEmailAndPassword(email, pass);
mIsSignup = true;
moveToNextScreenAfterValidation(authResult);
break;
default:
return;
authResult.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
@Override
public void onComplete(@NonNull Task<AuthResult> task)
Log.e(TAG, "Email/Pass Auth: onComplete() >> " + task.isSuccessful());
if (mIsSignup)
createNewUser();
if (!task.isSuccessful())
Toast.makeText(LogInActivity.this, "User is already in use or there is a temporary problem", Toast.LENGTH_LONG).show();
updateLoginStatus(task.isSuccessful() ? "N.A" : task.getException().getMessage());
Log.e(TAG, "Email/Pass Auth: onComplete() <<");
);
Log.e(TAG, "onEmailPasswordAuthClick() <<");
public void signInAnonymously(View v)
mAuth.signInAnonymously()
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
@Override
public void onComplete(@NonNull Task<AuthResult> task)
if (task.isSuccessful())
// Sign in success, update UI with the signed-in user's information
Log.d(TAG, "signInAnonymously:success");
FirebaseUser user = mAuth.getCurrentUser();
Intent intent = new Intent(LogInActivity.this,StandupPlayerMain.class);
startActivity(intent);
else
// If sign in fails, display a message to the user.
Log.w(TAG, "signInAnonymously:failure", task.getException());
Toast.makeText(LogInActivity.this, "Skip sign up failed", Toast.LENGTH_LONG).show();
);
public void onForgetPasswordClick(View V)
Intent intent = new Intent(LogInActivity.this,ForgotMyPassword.class);
startActivity(intent);
@Override
public void onActivityResult(int requestCode, int resultCode, Intent data)
Log.e(TAG, "onActivityResult () >>");
super.onActivityResult(requestCode, resultCode, data);
// Result returned from launching the Intent from GoogleSignInApi.getSignInIntent(...);
if (requestCode == RC_GOOGLE_SIGN_IN)
//Google Login...
Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
try
// Google Sign In was successful, authenticate with Firebase
GoogleSignInAccount account = task.getResult(ApiException.class);
firebaseAuthWithGoogle(account);
catch (ApiException e)
// Google Sign In failed, update UI appropriately
Log.e(TAG, "Google sign in failed", e);
Toast.makeText(LogInActivity.this, "Google signing in falied", Toast.LENGTH_LONG).show();
// ...
mCallbackManager.onActivityResult(requestCode, resultCode, data);
Log.e(TAG, "onActivityResult () <<");
private void facebookLoginInit()
Log.e(TAG, "facebookLoginInit() >>");
mCallbackManager = CallbackManager.Factory.create();
LoginButton loginButton = findViewById(R.id.login_button);
loginButton.setReadPermissions("email", "public_profile");
loginButton.registerCallback(mCallbackManager, new FacebookCallback<LoginResult>()
@Override
public void onSuccess(LoginResult loginResult)
Log.e(TAG, "facebook:onSuccess () >>" + loginResult);
Log.e(TAG, "look for me");
createNewUser();
handleFacebookAccessToken(loginResult.getAccessToken());
Log.e(TAG, "facebook:onSuccess () <<");
@Override
public void onCancel()
Log.e(TAG, "facebook:onCancel() >>");
updateLoginStatus("Facebook login canceled");
Log.e(TAG, "facebook:onCancel() <<");
@Override
public void onError(FacebookException error)
Log.e(TAG, "facebook:onError () >>" + error.getMessage());
Toast.makeText(LogInActivity.this, "Facebook log in failed", Toast.LENGTH_LONG).show();
updateLoginStatus(error.getMessage());
Log.e(TAG, "facebook:onError <<");
);
mAccessTokenTracker = new AccessTokenTracker()
@Override
protected void onCurrentAccessTokenChanged(AccessToken oldAccessToken,AccessToken currentAccessToken)
Log.e(TAG, "facebook:inside Token change <<");
if (currentAccessToken == null)
mAuth.signOut();
updateLoginStatus("Facebook signuout");
Log.e(TAG,"onCurrentAccessTokenChanged() >> currentAccessToken="+
(currentAccessToken !=null ? currentAccessToken.getToken():"Null") +
" ,oldAccessToken=" +
(oldAccessToken !=null ? oldAccessToken.getToken():"Null"));
;
Log.e(TAG, "facebookLoginInit() <<");
private void handleFacebookAccessToken(AccessToken token)
Log.e(TAG, "handleFacebookAccessToken () >>" + token.getToken());
AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
@Override
public void onComplete(@NonNull Task<AuthResult> task)
Log.e(TAG, "Facebook: onComplete() >> " + task.isSuccessful());
if(task.isSuccessful()==true)
Intent intent = new Intent(LogInActivity.this,StandupPlayerMain.class);
startActivity(intent);
updateLoginStatus(task.isSuccessful() ? "N.A" : task.getException().getMessage());
Log.e(TAG, "Facebook: onComplete() <<");
);
Log.e(TAG, "handleFacebookAccessToken () <<");
private void firebaseAuthenticationInit()
Log.e(TAG, "firebaseAuthenticationInit() >>");
//Obtain reference to the current authentication
mAuth = FirebaseAuth.getInstance();
FirebaseUser user = mAuth.getCurrentUser();
if (user != null)
Intent intent = new Intent(LogInActivity.this,StandupPlayerMain.class);
startActivity(intent);
mAuthListener = new FirebaseAuth.AuthStateListener()
@Override
public void onAuthStateChanged(@NonNull FirebaseAuth firebaseAuth)
Log.e(TAG, "onAuthStateChanged() >>");
updateLoginStatus("N.A");
Log.e(TAG, "onAuthStateChanged() <<");
;
Log.e(TAG, "firebaseAuthenticationInit() <<");
private void googleSigninInit()
Log.e(TAG, "googleSigninInit() >>" );
// Configure Google Sign In
GoogleSignInOptions gso = new GoogleSignInOptions
.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
.requestIdToken(getString(R.string.default_web_client_id))
.requestProfile()
.requestEmail()
.build();
// Build a GoogleSignInClient with the options specified by gso.
mGoogleSignInClient = GoogleSignIn.getClient(this, gso);
findViewById(R.id.google_sign_in_button).setOnClickListener(new View.OnClickListener()
@Override
public void onClick(View view)
Log.e(TAG, "look for me" + mAuth.getCurrentUser().toString());
onGooglesignIn();
);
Log.e(TAG, "googleSigninInit() <<" );
private void onGooglesignIn()
Log.e(TAG, "onGooglesignIn() >>" );
createNewUser();
Intent signInIntent = mGoogleSignInClient.getSignInIntent();
startActivityForResult(signInIntent, RC_GOOGLE_SIGN_IN);
Log.e(TAG, "onGooglesignIn() <<" );
private boolean checkIfEmailOrPasswordIsRequired(String email,String password)
boolean result = true;
if (email.length() == 0)
result = false;
Toast.makeText(LogInActivity.this, "Email is missing", Toast.LENGTH_LONG).show();
else if (password.length() == 0)
result = false;
Toast.makeText(LogInActivity.this, "Password is missing", Toast.LENGTH_LONG).show();
return result;
private void firebaseAuthWithGoogle(GoogleSignInAccount acct)
Log.e(TAG, "firebaseAuthWithGoogle() >>" + acct.getId());
AuthCredential credential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
@Override
public void onComplete(@NonNull Task<AuthResult> task)
updateLoginStatus(task.isSuccessful() ? "N.A" : task.getException().getMessage());
Log.e(TAG, "look for me");
Intent intent = new Intent(LogInActivity.this,StandupPlayerMain.class);
startActivity(intent);
);
Log.e(TAG, "firebaseAuthWithGoogle() <<");
private void moveToNextScreenAfterValidation(Task<AuthResult> authResult)
Log.e(TAG, "emailPasswordVaildation () >>");
authResult.addOnCompleteListener(this, new OnCompleteListener<AuthResult>()
@Override
public void onComplete(@NonNull Task<AuthResult> task)
Log.e(TAG, "emailPasswordVaildation outside if");
if(task.isSuccessful() == true)
Log.e(TAG, "emailPasswordVaildation inside if");
//createNewUser();
Intent intent = new Intent(LogInActivity.this,StandupPlayerMain.class);
intent.putExtra("User Info",mAuth.getCurrentUser().getUid());
startActivity(intent);
);
Log.e(TAG, "emailPasswordVaildation () <<");
private void updateLoginStatus(String details)
FirebaseUser user = mAuth.getCurrentUser();
if (user == null)
mStatus.setText("SIGNED-OUT \ndetails:" + details);
else
mStatus.setText("SIGNED-IN\nname:" + user.getDisplayName() +
"\nemail:" + user.getEmail() +
"\nuid:" + user.getUid() +
"\ndetails:" + details);
private void createNewUser()
Log.e(TAG, "createNewUser() >>");
FirebaseUser fbUser = mAuth.getCurrentUser();
DatabaseReference userRef = FirebaseDatabase.getInstance().getReference("Users");
if (fbUser == null)
Log.e(TAG, "createNewUser() << Error user is null");
return;
Log.e(TAG,userRef.toString());
userRef.child(fbUser.getUid()).setValue(new User(fbUser.getEmail(),0,null));
Log.e(TAG, "createNewUser() <<");
【问题讨论】：
请看creating an MCVE。在这种情况下，主要是最小的部分。 【参考方案1】：我猜这是适配器中的一个错误，不在当前活动中。
您的日志显示：- 尝试在 com.example.sefi.authenticationproject.adapter.VideoAdapter.onBindViewHolder 的空对象引用上调用虚拟方法“java.lang.String java.lang.Object.toString()” (VideoAdapter.java:114)
您的问题与活动/片段有关，您可能正在使用适配器“VideoAdapter”，并且可能存在一些未定义的“视图”。
如果问题仍然存在，请使用调试器并逐行运行代码，并提供更详细和具体的问题。
【讨论】：
但是由于firebase的getCurrentUser返回null，所以没有创建用户实体，因此onBind失败以上是关于Android Studio - Firebase 在尝试签署 facebook 或 google 时返回 null的主要内容，如果未能解决你的问题，请参考以下文章
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