Spotify WebAPI安卓集成求助：认证回调Intent为空

近几周我尝试在安卓应用中集成Spotify WebAPI，目标实现用户认证、获取用户头像（pfp）、用户名（handler）以及当前播放曲目名称和艺术家名称，但始终未成功。目前核心问题是认证回调时Intent为空，以下是我的相关代码、运行日志及已做的排查步骤：

AuthViewModel代码 #

import java.security.SecureRandom
import java.util.Base64

class SpotifyAuthViewModel : ViewModel() {

    private val clientId = ""
    private val redirectUri = "myapp://callback"
    private val authorizationEndpoint = "https://accounts.spotify.com/authorize"
    private val tokenEndpoint = "https://accounts.spotify.com/api/token"
    private val codeVerifier = generateCodeVerifier()
    private lateinit var authService: AuthorizationService

    fun initializeAuthService(context: Context) {
        authService = AuthorizationService(context)
        Log.d("SpotifyAuth", "AuthorizationService initialized")
    }

    private fun generateCodeVerifier(): String {
        val secureRandom = SecureRandom()
        val codeVerifier = ByteArray(32)
        secureRandom.nextBytes(codeVerifier)
        return Base64.getUrlEncoder().withoutPadding().encodeToString(codeVerifier)
    }

    private fun generateCodeChallenge(verifier: String): String {
        val bytes = verifier.toByteArray(Charsets.US_ASCII)
        val messageDigest = MessageDigest.getInstance("SHA-256")
        val digest = messageDigest.digest(bytes)
        return Base64.getUrlEncoder().withoutPadding().encodeToString(digest)
    }

    fun authenticate(authResultLauncher: ActivityResultLauncher<Intent>) {
        if (!::authService.isInitialized) {
            Log.e("SpotifyAuth", "AuthorizationService is not initialized")
            return
        }

        val serviceConfig = AuthorizationServiceConfiguration(
            Uri.parse(authorizationEndpoint),
            Uri.parse(tokenEndpoint)
        )

        val authRequest = AuthorizationRequest.Builder(
            serviceConfig,
            clientId,
            ResponseTypeValues.CODE,
            Uri.parse(redirectUri)
        ).setCodeVerifier(codeVerifier, generateCodeChallenge(codeVerifier), "S256")
            .setScope("user-read-currently-playing")
            .build()

        Log.d("SpotifyAuth", "Authorization Request URI: ${authRequest.toUri()}")

        val authIntent = authService.getAuthorizationRequestIntent(authRequest)
        authResultLauncher.launch(authIntent) // Launch the auth intent using the Activity Result API
    }

    fun handleAuthResponse(intent: Intent?) {
        if (intent == null) {
            Log.e("SpotifyAuth", "Intent is null")
            return
        }

        Log.d("SpotifyAuth", "Handling Intent: $intent")
        Log.d("SpotifyAuth", "Intent Data: ${intent.data}")
        Log.d("SpotifyAuth", "Intent Extras: ${intent.extras}")

        val authorizationResponse = AuthorizationResponse.fromIntent(intent)
        val authorizationException = AuthorizationException.fromIntent(intent)

        if (authorizationResponse != null) {
            Log.d("SpotifyAuth", "Authorization Response: ${authorizationResponse.jsonSerializeString()}")
            val tokenRequest = authorizationResponse.createTokenExchangeRequest()

            authService.performTokenRequest(tokenRequest) { tokenResponse, exception ->
                if (tokenResponse != null) {
                    Log.d("SpotifyAuth", "Token Response: ${tokenResponse.jsonSerializeString()}")
                    val accessToken = tokenResponse.accessToken
                    Log.d("SpotifyAuth", "Access Token: $accessToken")
                } else {
                    Log.e("SpotifyAuth", "Token Exchange Failed: ${exception?.errorDescription}")
                }
            }
        } else {
            Log.e("SpotifyAuth", "Authorization Failed: ${authorizationException?.errorDescription}")
        }
    }

    override fun onCleared() {
        super.onCleared()
        if (::authService.isInitialized) {
            authService.dispose()
        }
    }
}

运行日志 #

17:13:05.657 8857-8857 SpotifyAuth com.example.grooveshare D AuthorizationService initialized
17:13:05.662 8857-8857 SpotifyAuth com.example.grooveshare D Authorization Request URI: https://accounts.spotify.com/authorize?redirect_uri=myapp%3A%2F%2Fcallback&client_id=7ac6f34f4fd947d8abee1dbbcbc478f5&response_type=code&state=Yp97iSWgmoqqbVBzqzE3Dw&nonce=z1bk_2FURFxkkBHUtn-G2Q&scope=user-read-currently-playing&code_challenge=4IFKhxrW5p_PMYYnxoJ2KAvVbvErr4I4ZXtb8Sgy8SM&code_challenge_method=S256
17:13:11.010 8857-8857 SpotifyAuth com.example.grooveshare E Intent is null

已执行的排查步骤 #

• 确认ViewModel中的redirect uri与Spotify开发者后台配置完全一致
• 已在AndroidManifest.xml中正确配置Intent Filter

内容的提问来源于stack exchange，提问作者dimitris.terzz