Question

我是kotlin的初学者，我想知道当用户单击“退出”按钮时如何使用户重新使用firebase-ui登录屏幕。我正在尝试在android上实现这一点。

class MainActivity : AppCompatActivity() {
private val RC_SIGN_IN = 123;
val auth=FirebaseAuth.getInstance()
// Choose authentication providers
val providers = arrayListOf(
    AuthUI.IdpConfig.EmailBuilder().build(),
    AuthUI.IdpConfig.PhoneBuilder().build(),
    AuthUI.IdpConfig.GoogleBuilder().build())

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)

    signout.setOnClickListener{v ->
        AuthUI.getInstance()
            .signOut(this)
            .addOnCompleteListener {
                // ...
            }
    }

    if(auth.currentUser!=null)
    {

    }
    else
    {
        // Create and launch sign-in intent
        startActivityForResult(
            AuthUI.getInstance()
                .createSignInIntentBuilder()
                .setAvailableProviders(providers)
                .build(),
            RC_SIGN_IN)
    }
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
    super.onActivityResult(requestCode, resultCode, data)
    if (requestCode == RC_SIGN_IN) {
        val response = IdpResponse.fromResultIntent(data)
        if (resultCode == Activity.RESULT_OK) {                
            val user = FirebaseAuth.getInstance().currentUser
        } else {

        }
    }
}

}

Answer 1

val intent = Intent(context, LoginActivity::class.java)
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
startActivity(intent)
finish()

Answer 2

您必须创建多个活动来简化您的应用程序结构。这样，您还可以管理登录会话。 OnClick注销按钮设置了登录屏幕的意图

signout.setOnClickListener {

        val intent = Intent(this, LoginActivity::class.java)
                    intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP or Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK)
                startActivity(intent)
                finish()    

    }

用户单击Kotlin中的退出按钮后，如何返回登录屏幕？

2 个答案: