[英]How to set up firebase Authentication (with ```twitter_login: ^4.0.1``` and ```flutter_facebook_auth: ^4.0.1``` respectively) in Flutter?
[英]How to set up Interface and listener in custom Dialog class to pass Facebook's login callback to firebase auth in MainActivity?
我在實現自定義對話框類從 facebook 獲取響應並將其傳遞回主要活動時遇到了一些問題。
這是我的自定義類:
class LoginDialog(var c: Activity) : Dialog(c), View.OnClickListener {
val mContext = c
private lateinit var realFbButton: LoginButton
private lateinit var listener: LoginListener
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
requestWindowFeature(Window.FEATURE_NO_TITLE)
getWindow()?.setBackgroundDrawableResource(android.R.color.transparent);
setContentView(R.layout.login_dialog)
// here image to cover the real facebook LoginButton
val loginFbButton: ImageView = findViewById(R.id.facebookButton)
loginFbButton.setOnClickListener(this)
// the real facebook login button I wanna click to start the facebook auth process
realFbButton = findViewById(R.id.facebooOfficalButton)
realFbButton.setOnClickListener(this)
}
override fun onClick(v: View) {
when (v.id) {
R.id.facebookButton -> {realFbButton.performClick()
// Initialize Facebook Login button
//TODO: (nothing necessary)
}
R.id.facebooOfficalButton -> {
realFbButton.setReadPermissions("email", "public_profile")
// register callback after LoginButton has been pushed
realFbButton.registerCallback(callbackManager, object :
FacebookCallback<LoginResult>{
override fun onSuccess(result: LoginResult?) {
try{
Toast.makeText(context, "success", Toast.LENGTH_LONG).show()
// listener to pass result
listener.passLoginListener(result)
}
catch(e: Exception){
Toast.makeText(context, "exception" + e, Toast.LENGTH_LONG).show()
}
TODO("Not yet implemented")
}
override fun onCancel() {
TODO("Not yet implemented")
}
override fun onError(error: FacebookException?) {
TODO("Not yet implemented")
}
})
}
else -> {
Toast.makeText(mContext, "id not recognized: " + v, Toast.LENGTH_LONG).show()
}
}
dismiss()
}
fun setLoginListener(listener: LoginListener?) {
this.listener = listener!!
}
interface LoginListener{
public fun passLoginListener(callBack: LoginResult?)
}
}
在我的主要活動中:
// interface implementation
class CentralActivity : AppCompatActivity(), LoginDialog.LoginListener{/* my full class is here
...*/}
override fun passLoginListener(callBack: LoginResult?) {/*here call to handleFacebookAccessToken(token: AccessToken)*/}
// in onCreate overriden method:
val dialog = LoginDialog(this@CentralActivity)
dialog.setLoginListener(this@CentralActivity) // this activate the listener
但是它不起作用:即使使用調試器,我也絕對可以告訴沒有任何東西可以通過接口傳遞到活動,也不會觸發“成功”響應(與其他響應一樣)。
我能做些什么來正確地實施它?
我解決了這個問題,我希望這個經驗可以為其他人節省一些寶貴的時間:)
listener 需要正確初始化到自定義類中,其中“c”是從我的主要活動傳遞的活動:
//in onCreate, inside the custom dialog class: listener = c as LoginDialog.LoginListener
由於回調需要時間返回,因此將響應傳遞給主活動是沒有用的:相反,傳遞按下的按鈕更好
override fun onClick(v: View) { when (v.id) { R.id.facebookButton -> {realFbButton.performClick() //TODO: nothing here } R.id.facebooOfficalButton -> { realFbButton.setReadPermissions("email", "public_profile") this.listener.passLoginListener(realFbButton) // here we go passing the button to the interface and to the main activity } else -> { Toast.makeText(mContext, "id not recognized: " + v, Toast.LENGTH_LONG).show() } } dismiss()
在主要活動中,讓我們將其設置為等待結果:這是偵聽器
override fun passLoginListener(fbb: LoginButton): LoginButton { // get the LoginButton and set up the receiver fbb.registerCallback(callbackManager, object : FacebookCallback<LoginResult> { override fun onSuccess(result: LoginResult?) { try{ Toast.makeText(applicationContext, "success", Toast.LENGTH_LONG).show() handleFacebookAccessToken(result!!.accessToken) } catch(e: Exception){ Toast.makeText(applicationContext, "exception" + e, Toast.LENGTH_LONG).show() } } override fun onCancel() { TODO("Not yet implemented") } override fun onError(error: FacebookException?) { TODO("Not yet implemented") } }) return fbb }
現在 onActivityResult 方法可以正常工作了
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
// Pass the activity result back to the Facebook SDK
callbackManager.onActivityResult(requestCode, resultCode, data)}
現在,對於在 onCreate 中初始化的 Firebase 身份驗證也是如此
//firebase auth in onCreate
auth = Firebase.auth
並在此處更新(有關此信息,請參閱官方 firebase 文檔)
private fun handleFacebookAccessToken(token: AccessToken) {
Log.d("Tag", "handleFacebookAccessToken:$token")
Toast.makeText(applicationContext, "in handle fb login " + token, Toast.LENGTH_LONG).show()
val credential = FacebookAuthProvider.getCredential(token.token)
auth.signInWithCredential(credential)
.addOnCompleteListener(this) { task ->
if (task.isSuccessful) {
// Sign in success, update UI with the signed-in user's information
Log.d("Tag", "signInWithCredential:success")
val user = auth.currentUser
updateUI(user)
} else {
// If sign in fails, display a message to the user.
Log.w("Tag", "signInWithCredential:failure", task.exception)
Toast.makeText(baseContext, "Authentication failed.",
Toast.LENGTH_SHORT).show()
updateUI(null)
}
// ...
}
}
希望能幫助到你!
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