Question

我正在尝试用kotlin编写的facebook登录。以下代码工作正常：

包social.social

import android.content.Intent
import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import com.facebook.*
import com.facebook.login.LoginResult
import com.facebook.login.LoginManager
import com.facebook.login.widget.LoginButton
import org.json.JSONObject
import java.util.*


class MainActivity : AppCompatActivity() {
    private var callbackManager: CallbackManager? = null

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

        callbackManager = CallbackManager.Factory.create()
        var loginBtn: LoginButton = findViewById(R.id.login_button) as LoginButton
        loginBtn.setReadPermissions(Arrays.asList("public_profile","email","user_photos"))
        loginBtn.registerCallback(callbackManager, object : FacebookCallback<LoginResult> {
            override fun onCancel() {
                TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
            }


            override fun onError(error: FacebookException) {
                print("error" +error.message)
            }

            override fun onSuccess(result: LoginResult) {
                GraphRequest.newMeRequest(result.accessToken, GraphRequest.GraphJSONObjectCallback {
                    obj: JSONObject, response: GraphResponse ->
                    println(obj.toString())
                    println(obj.getString("email"))})
                println("successful" + result.accessToken)
            }
        })
    }



    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        callbackManager!!.onActivityResult(requestCode, resultCode, data)
    }

}

我尝试向GraphRequest添加参数，所以我需要将它存储到一个变量中：

val request: GraphRequest = GraphRequest.newMeRequest(result.accessToken, GraphRequest.GraphJSONObjectCallback {
                    obj: JSONObject, response: GraphResponse ->
                    println(obj.toString())
                    println(obj.getString("email"))})
                request.executeAsync()

但现在它无法编译

错误：任务'：app：compileDebugJavaWithJavac'执行失败。

无法读取类文件：'C：\ projects \ social \ app \ build \ tmp \ kotlin-classes \ debug \ social \ social \ MainActivity $ onCreate $ 1 $ onSuccess $ 1.class'

Answer 1

我是Kotlin初学者，但似乎Kotlin Code for for graph request已经创建了一个编译错误。所以，最好用Java编写它并将其转换为Kotlin并重建+清理你的代码或者更新Kotlin插件。

无法编译Kotlin代码

1 个答案: