我是 firebase 新手，我想第一次实现 facebook 身份验证。我可以成功获取 facebook token ，但是当我调用 signInWithCredential() ide 时会抛出此异常。
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.android.gms.tasks.Task com.google.android.gms.common.api.GoogleApi.zzb(com.google.android.gms.common.api.internal.zzdf)' on a null object reference
这是我的源代码
public class LoginActivity extends AppCompatActivity {
private CallbackManager callbackManager;
private FirebaseAuth mAuth;
private String TAG = "Test";
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mAuth = FirebaseAuth.getInstance();
callbackManager = CallbackManager.Factory.create();
LoginButton loginButton = (LoginButton) findViewById(R.id.login_button);
loginButton.registerCallback(callbackManager, new FacebookCallback<LoginResult>() {
@Override
public void onSuccess(LoginResult loginResult) {
handleFacebookAccessToken(loginResult.getAccessToken());
}
@Override
public void onCancel() {
}
@Override
public void onError(FacebookException e) {
}
});
}
private void handleFacebookAccessToken(AccessToken token) {
AuthCredential credential = FacebookAuthProvider.getCredential(token.getToken());
mAuth.signInWithCredential(credential)
.addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
@Override
public void onComplete(@NonNull Task<AuthResult> task) {
if (task.isSuccessful()) {
FirebaseUser user = mAuth.getCurrentUser();
} else {
}
}
});
}
@Override
public void onStart() {
super.onStart();
FirebaseUser currentUser = mAuth.getCurrentUser();
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
callbackManager.onActivityResult(requestCode, resultCode, data);
}
}
感谢您的任何建议。
最佳答案
您必须安装 Google Play 服务。我想您正在模拟器上测试它。尝试在真实设备上测试它或确保您的模拟器上安装了 GPS
关于android - Facebook 登录成功但 firebase 身份验证抛出异常，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/47283637/