Question

与许多开发人员一样，我在本周公布之后将我的后端迁移到Parse，我无法弄清楚如何检查当前是否有用户登录。我正在使用电子邮件和密码验证。

这是我的代码不起作用：

public class ApplicationStart extends Application {


@Override
public void onCreate() {
    super.onCreate();
    Firebase.setAndroidContext(this);
    Firebase ref = new Firebase(Passwords.FB_LINK);
    AuthData currentUser = ref.getAuth();
    if (currentUser == null) {
        // Take user to log in screen
        Intent intent = new Intent(this, MyIntro.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }
    else {
        // User already logged in
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }
    TwitterAuthConfig authConfig = new TwitterAuthConfig(Passwords.TWITTER_KEY, Passwords.TWITTER_SECRET);
    Fabric.with(this, new TwitterCore(authConfig), new Digits());
   }
}

Answer 1

所以我在发布这个问题后不久就设法解决了这个问题。这是有效的代码。我只需要换一行：

Firebase ref = new Firebase(Passwords.FB_LINK).child("users");

完整代码：

public class ApplicationStart extends Application {


@Override
public void onCreate() {
    super.onCreate();
    Firebase.setAndroidContext(this);
    Firebase ref = new Firebase(Passwords.FB_LINK).child("users");
    AuthData currentUser = ref.getAuth();
    if (currentUser == null) {
        // Take user to log in screen
        Intent intent = new Intent(this, MyIntro.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }
    else {
        // User already logged in
        Intent intent = new Intent(this, MainActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        startActivity(intent);
    }
    TwitterAuthConfig authConfig = new TwitterAuthConfig(Passwords.TWITTER_KEY, Passwords.TWITTER_SECRET);
    Fabric.with(this, new TwitterCore(authConfig), new Digits());
    }
}

Answer 2

来自Firebase Auth Quickstart：

声明一个实例（类变量）

private FirebaseAuth mAuth;

在onCreate()初始化mAuth

mAuth = FirebaseAuth.getInstance();

在onStart()中检查用户是否已登录并检查null

@Override
public void onStart() {
    super.onStart();
    FirebaseUser currentUser = mAuth.getCurrentUser();
    if (currentUser == null) {
        // No user is signed in
    } else {
        // User logged in
    }
}

这可以通过一个班轮完成：

if(FirebaseAuth.getInstance().getCurrentUser()) {
   //User is logged in
}

Answer 3

private FirebaseAuth firebaseAuth;
firebaseAuth = FirebaseAuth.getInstance();

    if (firebaseAuth.getCurrentUser() != null) {
        startActivity(new Intent(MainActivity.this, UserActivty.class));
        finish();
    }

选中此项，如果您已经登录，它将直接将您发送到主页。

获取当前用户Firebase Android

3 个答案: