主页 / 问题 / 1544784
Accepted
mister_svinia
Asked:2023-10-09 04:13:37 +0000 UTC2023-10-09 04:13:37 +0000 UTC

在 MainUIThread 中访问小部件时出错（两种相同的情况，一种发生，另一种则不发生）

  • 772

我有两个小部件：

<TextView
    android:id="@+id/debugView"
    android:layout_width="256dp"
    android:layout_height="128dp"
    android:layout_marginBottom="120dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.5"
    app:layout_constraintStart_toStartOf="parent" />

<TextView
    android:id="@+id/activityAuthorization_widgets_responseStatus"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_constraintBottom_toTopOf="@+id/activityAuthorization_widgets_login"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/activityAuthorization_widgets_inputPassword" />

有这个活动（未完成）：

class ActivityAuthorization : AppCompatActivity() {
    private val httpClient = HttpClient()

    private lateinit var debugView: TextView

    private lateinit var inputLogin: TextInputEditText
    private lateinit var inputPassword: TextInputEditText
    private lateinit var buttonLogIn: Button
    private lateinit var showPassword: CheckBox
    private lateinit var responseStatusView: TextView

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

        supportActionBar?.hide()

        binder()
    }

    @SuppressLint("SetTextI18n")
    @OptIn(DelicateCoroutinesApi::class)
    private fun binder() {
        debugView = findViewById(R.id.debugView)

        inputLogin = findViewById(R.id.activityAuthorization_widgets_inputLogin)
        inputPassword = findViewById(R.id.activityAuthorization_widgets_inputPassword)
        buttonLogIn = findViewById(R.id.activityAuthorization_widgets_login)

        showPassword = findViewById(R.id.activityAuthorization_widgets_showPassword)
        responseStatusView = findViewById(R.id.activityAuthorization_widgets_responseStatus)

        buttonLogIn.setOnClickListener {
            GlobalScope.launch(Dispatchers.IO) {
                val response: HttpResponse =
                    httpClient.request(
                        URLS.AUTHORIZATION
                    ) {
                        method = HttpMethod.Get
                        url {
                            parameters.append(
                                URLS.AUTHORIZATION_USERNAME,
                                inputLogin.text.toString()
                            )
                            parameters.append(
                                URLS.AUTHORIZATION_PASSWORD,
                                inputPassword.text.toString()
                            )
                        }
                    }

                when (response.status.value) {
                    200 -> completeAuthorization(response.bodyAsText())
                    404 -> userNotFound()
                    else -> unprocessedResponse()
                }
            }
        }

        showPassword.setOnCheckedChangeListener { _, isChecked ->
            if (isChecked) inputPassword.setInputType(InputType.TYPE_CLASS_TEXT)
            else inputPassword.setInputType(InputType.TYPE_CLASS_TEXT or InputType.TYPE_TEXT_VARIATION_PASSWORD)
        }
    }

    @SuppressLint("SetTextI18n")
    private fun completeAuthorization(responseText: String) {
        val responseData = JsonIterator.deserialize(
            responseText,
            ResponsePackets.AC.Authorization.Done::class.java
        )

        try {
            responseData?.apply {
                debugView.text = "id: ${
                    responseData.data.id
                }\ntoken: ${responseData.data.token}"
            } ?: unprocessedResponse()
        } catch (_: NullPointerException) { unprocessedResponse() }
    }

    @SuppressLint("SetTextI18n")
    private fun userNotFound() {
        responseStatusView.text = "123"
    }

    @SuppressLint("SetTextI18n")
    private fun unprocessedResponse() {
        responseStatusView.text = "123"
    }
}

服务器（Python Django）返回三个之一（取决于结果）

return JsonResponse({
    'status': 'Done',
    'data': {
        'id': id,
        'token': helper.DBOperator.create_token(request.META.get('HTTP_USER_AGENT'), id)
    }
}, status=200)

return JsonResponse({
    'status': 'Refused',
    'reason': 'BadRequest',
    'description': 'UserNotFound'
}, status=404)

return JsonResponse({
    'status': 'Refused',
    'reason': 'BadRequest',
    'description': 'LackOfArguments'
}, status=406)

好吧，429，但我出于调试目的将其注释掉了。

如果状态200通过并且数据正确（而且确实是正确的），那么就id正常token显示。没有错误发生。但如果返回的不是 200，那么我会切换到unprocessedResponse()（暂时也是暂时的）并得到：

2023-10-08 23:03:39.732  5012-5180  AndroidRuntime          com.gct.cl.android                   E  FATAL EXCEPTION: DefaultDispatcher-worker-4
                                                                                                    Process: com.gct.cl.android, PID: 5012
                                                                                                    android.view.ViewRootImpl$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
                                                                                                        at android.view.ViewRootImpl.checkThread(ViewRootImpl.java:11586)
                                                                                                        at android.view.ViewRootImpl.requestLayout(ViewRootImpl.java:2648)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at androidx.constraintlayout.widget.ConstraintLayout.requestLayout(ConstraintLayout.java:3605)
                                                                                                        at android.view.View.requestLayout(View.java:27623)
                                                                                                        at android.widget.TextView.checkForRelayout(TextView.java:10904)
                                                                                                        at android.widget.TextView.setText(TextView.java:6965)
                                                                                                        at android.widget.TextView.setText(TextView.java:6751)
                                                                                                        at android.widget.TextView.setText(TextView.java:6703)
                                                                                                        at com.gct.cl.android.ActivityAuthorization.userNotFound(ActivityAuthorization.kt:106)
                                                                                                        at com.gct.cl.android.ActivityAuthorization.access$userNotFound(ActivityAuthorization.kt:23)
                                                                                                        at com.gct.cl.android.ActivityAuthorization$binder$1$1.invokeSuspend(ActivityAuthorization.kt:76)
                                                                                                        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
                                                                                                        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:108)
                                                                                                        at kotlinx.coroutines.internal.LimitedDispatcher$Worker.run(LimitedDispatcher.kt:115)
                                                                                                        at kotlinx.coroutines.scheduling.TaskImpl.run(Tasks.kt:103)
                                                                                                        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:584)
                                                                                                        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:793)
                                                                                                        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:697)
                                                                                                        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:684)
                                                                                                        Suppressed: kotlinx.coroutines.internal.DiagnosticCoroutineContextException: [StandaloneCoroutine{Cancelling}@a649923, Dispatchers.IO]

据我了解，该错误是由于尝试responseStatusView从发出请求的 Coruntine 进行访问而发生的。但为什么GET 200我没有收到类似的状态错误呢？为了以防万一，我附加了模式类和存储类：

package com.gct.cl.android;


public class ResponsePackets {
    static class AC {
        static class Authorization {
            static class Done {
                String status;

                AuthData data;
            }
            static class ClientError {
                String status;
                String reason;
                String description;
            }
            static class NotFound {
                String status;
                String reason;
                String description;
            }
        }
        static class AuthData {
            long id;
            String token;
        }
    }
}

package com.gct.cl.android

object URLS {
    const val AUTHORIZATION = "http://192.168.196.60:8082/auth" // Я подключаюсь через прокси
    const val AUTHORIZATION_USERNAME = "username"
    const val AUTHORIZATION_PASSWORD = "password"
}

UDP 我将文本输出移至debugView：

@SuppressLint("SetTextI18n")
private fun completeAuthorization(responseText: String) {
    val responseData = JsonIterator.deserialize(
        responseText,
        ResponsePackets.AC.Authorization.Done::class.java
    )
    try {
        runOnUiThread {
            Thread {
                responseData?.apply {
                    debugView.text = "id: ${responseData.data.id}\ntoken: ${responseData.data.token}"
                } ?: unprocessedResponse()
            }.start()
        }
    } catch (_: NullPointerException) {
        unprocessedResponse()
    }
}

@SuppressLint("SetTextI18n")
private fun userNotFound() {
    debugView.text = "123"
}

@SuppressLint("SetTextI18n")
private fun unprocessedResponse() {
    debugView.text = "123"
}

Aaand...一切都按预期进行。

我尝试这样做：

@SuppressLint("SetTextI18n")
private fun userNotFound() {
    runOnUiThread {
        Thread {
            debugView.setText(R.string.authorization_widgets_responseStatus_userNotFound.toString())
        }
    }
}

Aaand...同样的错误。该代码在 4 部手机和两个模拟器上进行了测试。结果到处都一样。

java

1 个回答

  1. Best Answer

    此链接完美地解释了有关如何从任何线程访问 UI 的所有内容。
    https://developer.android.com/guide/components/processes-and-threads

    将您的分层流程设计替换为

    debugView.post {
  debugView.text = "id: ${responseData.data.id}\ntoken:${responseData.data.token}"
}

    和

    responseStatusView.post {
  responseStatusView.text = "123"
}

    您可以从任何线程调用此代码。

    • 0

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