Question

我正在使用图sdk编写android应用程序。我试图故意创建GraphServiceClient，但是由于nullpointerexception而下降。我在MainActivity中正在做什么：

val authenticationAdapter = object : MSAAuthAndroidAdapter(application) {
            override fun getClientId(): String {
                return "ca001e3e-b872-466e-99a3-1264efaedb45"
            }

            override fun getScopes(): Array<String> {
                return arrayOf("https://graph.microsoft.com/Calendars.ReadWrite",
                    "https://graph.microsoft.com/Contacts.ReadWrite",
                    "https://graph.microsoft.com/Files.ReadWrite",
                    "https://graph.microsoft.com/Mail.ReadWrite",
                    "https://graph.microsoft.com/Mail.Send",
                    "https://graph.microsoft.com/User.ReadBasic.All",
                    "https://graph.microsoft.com/User.ReadWrite",
                    "offline_access",
                    "openid")
            }
        }

        login.setOnClickListener { authenticationAdapter.login(this, object : ICallback<Void>{
            override fun success(result: Void?) {
                val intent = Intent(baseContext, FilesBrowser::class.java)
                intent.putExtra("token", authenticationAdapter.accessToken)

                startActivity(intent)
            }

            override fun failure(ex: ClientException?) {
                Toast.makeText(baseContext, ex.toString(), Toast.LENGTH_LONG).show()
            }

        })}

并按照我的意图进行编码

        val token = intent.getSerializableExtra("token").toString()


        val mClient = GraphServiceClient
            .Builder()
            .authenticationProvider { request -> request?.addHeader("authorization", "bearer " + token) }
            .buildClient()

我收到此错误：

E / Android运行时：致命异常：主要流程：com.example.micloud，PID：22215 java.lang.RuntimeException：无法启动活动ComponentInfo {com.example.micloud / com.example.micloud.FilesBrowser}： java.lang.NullPointerException：执行程序在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3270）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3409）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:83）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:135）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:95）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:2016）在android.os.Handler.dispatchMessage（Handler.java:107）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7356）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:492）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:930）引起原因：java.lang.NullPointerException：执行程序在com.microsoft.graph.core.BaseClient.validate（BaseClient.java:129）在com.microsoft.graph.extensions.GraphServiceClient $ Builder.buildClient（GraphServiceClient.java:113）在com.example.micloud.FilesBrowser.onCreate（FilesBrowser.kt：36）在android.app.Activity.performCreate（Activity.java:7802）在android.app.Activity.performCreate（Activity.java:7791）在android.app.Instrumentation.callActivityOnCreate（Instrumentation.java:1299）在android.app.ActivityThread.performLaunchActivity（ActivityThread.java:3245）在android.app.ActivityThread.handleLaunchActivity（ActivityThread.java:3409）在android.app.servertransaction.LaunchActivityItem.execute（LaunchActivityItem.java:83）在android.app.servertransaction.TransactionExecutor.executeCallbacks（TransactionExecutor.java:135）在android.app.servertransaction.TransactionExecutor.execute（TransactionExecutor.java:95）在android.app.ActivityThread $ H.handleMessage（ActivityThread.java:2016）在android.os.Handler.dispatchMessage（Handler.java:107）在android.os.Looper.loop（Looper.java:214）在android.app.ActivityThread.main（ActivityThread.java:7356）在java.lang.reflect.Method.invoke（本机方法）在com.android.internal.os.RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:492）在com.android.internal.os.ZygoteInit.main（ZygoteInit.java:930）

所以当我打电话给buildClient时，它正在下降。

为什么？我在做什么错了？

无法创建GraphServiceClient

0 个答案: