Kotlin 协程抛出 JobCancellationException 并触发观察者
Kotlin Coroutine throws JobCancellationException and trigger observers
我正在 MVVM 架构中实现 kotlin coroutines 以替换我的 RxJava 依赖项。
我的问题:
注销后（这个细节很重要，因为我在重新开始时没有异常），我在 viewModelScope AND[ 的启动时抛出了 JobCancellationException 协程异常=107=] 我在 LoginActivity 中的所有 observers 都被触发（wtf？）即使 try/catch 块没有执行（断点）所以它完全破坏了我的代码逻辑。
我的图层如下：
Activity，setOnClickListener触发，调用viewModel函数-> ViewModel，在viewModelScope内创建coroutine并调用 suspend function -> Repository, suspended function 从 viewModel 调用并调用 suspend function in ApiService -> suspend function 调用 Api
用例：
我登录了刚启动的应用程序 (LoginActivity)。我的堆栈被清除以启动 MainActivity。我去 SettingsActivity 注销。我注销并再次清除堆栈以开始一个全新的 LoginActivity。当我再次尝试登录时，我抛出了 exception 并触发了我的 observers。
登录活动：
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
tvLogin.setSafeOnClickListener { login() }
}
private fun login() {
Firebase.analytics.logEvent("hit_login", null)
runOnUiThread {
pDialog = SweetAlertDialog(this, SweetAlertDialog.PROGRESS_TYPE)
pDialog!!.progressHelper.barColor = Color.parseColor("#2A6022")
pDialog!!.titleText =
"<font color='#2A6022'>" + resources.getString(R.string.signing) + "</font>"
pDialog!!.setCancelable(false)
}
var pwd = etPassword.text.toString()
if (passedBiometric) {
pwd = sessionManager.decrypt(sessionManager.loadUsername())
}
passedBiometric = false
viewModel.login(etUsername.text.toString(), pwd)
viewModel.error.observe(this, {
Toast.makeText(this, getString(it), Toast.LENGTH_SHORT).show()
})
viewModel.loadingState.observe(this, {
Timber.e("LoadingState Observer triggered")
when (it) {
LoadingState.LOADED -> {
pDialog!!.dismiss()
Timber.e("LOADED")
startMainActivity()
}
LoadingState.FAILED -> {
pDialog!!.dismiss()
Timber.e("FAILED")
viewModel.error.value?.let { errorRsc ->
Toast.makeText(this, getString(errorRsc), Toast.LENGTH_SHORT).show()
}
}
LoadingState.LOADING -> {
pDialog!!.show()
Timber.e("LOADING")
}
}
})
}
private fun startMainActivity() {
val intent = Intent(this, MainActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
intent.action = this.intent.action
intent.putExtra(ProfileFragment.USER, viewModel.user.value)
startActivity(intent)
finish()
}
登录视图模型：
class LoginViewModel(private val repo: ApiRepository, private val sessionManager: SessionManager) :
ViewModel() {
private val _error = MutableLiveData<Int>()
val error: LiveData<Int>
get() = _error
private val _loadingState = MutableLiveData<LoadingState>()
val loadingState: LiveData<LoadingState>
get() = _loadingState
private val token = MutableLiveData<SessionToken>()
private val _user = MutableLiveData<User>()
val user: LiveData<User>
get() = _user
fun login(username: String, password: String) {
try {
Timber.e("enter try block outside viewModelScope.launch")
viewModelScope.launch {
try {
Timber.e("try block inside viewModelScope.launch")
_loadingState.value = LoadingState.LOADING
token.value = repo.login(username, password)
sessionManager.storeSessionToken(token.value!!.token)
sessionManager.storeUsername(username)
sessionManager.encrypt(username, password)
_user.value = repo.getUser()
_loadingState.value = LoadingState.LOADED
} catch (e: Exception) {
Timber.e("catch block inside viewModelScope.launch")
if (e is HttpException) {
when (e.code()) {
500, 503 -> {
_error.value = R.string.error_api_down
}
400 -> {
_error.value = R.string.error_bad_credentials
}
}
}
_loadingState.value = LoadingState.FAILED
}
}
}
catch (e: Exception){
Timber.e("Catch block outside viewmodelScope.launch")
when (e){
is CancellationException -> { Timber.e("CancellationException caught")}
else -> { Timber.e("Unknown caught")}
}
}
}
}
Api存储库：
class ApiRepository(
private val apiService: ApiService,
private val sessionManager: SessionManager
) {
suspend fun login(username: String, password: String): SessionToken {
val map = mutableMapOf<String, String>()
map["username"] = username
map["password"] = password
return apiService.login(
JSONObject(map.toMap()).toString()
.toRequestBody("application/json".toMediaTypeOrNull())
)
}
suspend fun getUser(): User {
return apiService.getUser(sessionManager.loadSessionToken())
}
}
Api服务：
interface ApiService {
companion object {
private const val AUTH = "Authorization"
}
@POST(ApiRouting.URL_TOKEN)
suspend fun login(@Body requestBody: RequestBody): SessionToken
@GET(ApiRouting.URL_GET_USER)
suspend fun getUser(@Header(AUTH) token: String): User
}
设置活动：
private fun initListeners() {
tvLogout.setSafeOnClickListener {
DashboardManager.clearValues()
sessionManager.clearSessionToken()
val intent = Intent(this, LoginActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
startActivity(intent)
finish()
}
}
TLDR：为什么抛出异常？为什么观察者被触发？为什么这种情况只发生在注销后而不是重新开始时？
我尝试在启动中添加 coroutineScope 并使用 withContext(Dispatchers.IO) 在存储库中添加另一个范围，但它没有改变任何东西
我是 kotlin coroutines 的初学者，所以如果您有任何建议，link 或任何可能有帮助的欢迎。或者，如果您需要任何其他代码块，请告诉我。
编辑：
我添加了几个日志（LoginViewModel 和 MainActivity）来详细说明当我进入我的 viewModelScope.launch 周围的 try catch 块时以及我的 MainActivity 开始时（我的 [= 之后的下一个动作） 49=] 在 LoginAvtivity.
中触发
为了让您更清楚地了解全新（和成功）的开始是什么样的：
E/LoginViewModel: enter try block outside viewModelScope.launch
E/LoginViewModel$login: try block inside viewModelScope.launch
E/LoginActivity$login: LoadingState Observer triggered
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
E/LoginActivity$login: LOADING
LoadingState Observer triggered
LOADING
I/okhttp.OkHttpClient: --> POST http://45.153.184.141/api-token-auth/
Content-Type: application/json; charset=utf-8
Content-Length: 46
--> END POST (46-byte body)
E/LoginActivity$login: LoadingState Observer triggered
LOADING
D/DecorView: onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@7175d32[LoginActivity]
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
I/okhttp.OkHttpClient: <-- 200 OK http://xx.xx.xx.xx/api-token-auth/ (237ms)
Date: Wed, 03 Mar 2021 21:31:39 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: application/json
Allow: POST, OPTIONS
X-Frame-Options: DENY
Content-Length: 52
Vary: Cookie
X-Content-Type-Options: nosniff
<-- END HTTP (52-byte body)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
D/TransportRuntime.SQLiteEventStore: Storing event with priority=DEFAULT, name=FIREPERF for destination cct
D/TransportRuntime.JobInfoScheduler: Scheduling upload for context TransportContext(cct, DEFAULT, MSRodHRwczovL2ZpcmViYXNlbG9nZ2luZy1wYS5nb29nbGVhcGlzLmNvbS92MS9maXJlbG9nL2xlZ2FjeS9iYXRjaGxvZ1xBSXphU3lDY2traUg4aTJaQVJ3T3MxTEV6RktsZDE1YU9HOG96S28=) with jobId=877081683 in 30000ms(Backend next call timestamp 1614807010307). Attempt 1
I/okhttp.OkHttpClient: --> GET http://45.153.184.141/api/users/profile/
Authorization: Token token
--> END GET
D/OnePlusJankManager: Chor uploadMDM JANK_TYPE_ONCE mViewTitle = com.weedmanager.myweedmanager/com.weedmanager.myweedmanager.authentication.LoginActivity--- jank level = 1
I/okhttp.OkHttpClient: <-- 200 OK http://45.153.184.141/api/users/profile/ (83ms)
Date: Wed, 03 Mar 2021 21:31:40 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: application/json
Vary: Accept
Allow: GET, HEAD, OPTIONS
X-Frame-Options: DENY
Content-Length: 103
X-Content-Type-Options: nosniff
<-- END HTTP (103-byte body)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
E/LoginActivity$login: LoadingState Observer triggered
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
E/LoginActivity$login: LOADED
D/TransportRuntime.SQLiteEventStore: Storing event with priority=DEFAULT, name=FIREPERF for destination cct
D/DecorView: onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@4a8ec73[LoginActivity]
D/TransportRuntime.JobInfoScheduler: Upload for context TransportContext(cct, DEFAULT, MSRodHRwczovL2ZpcmViYXNlbG9nZ2luZy1wYS5nb29nbGVhcGlzLmNvbS92MS9maXJlbG9nL2xlZ2FjeS9iYXRjaGxvZ1xBSXphU3lDY2traUg4aTJaQVJ3T3MxTEV6RktsZDE1YU9HOG96S28=) is already scheduled. Returning...
E/LoginActivity$login: LoadingState Observer triggered
LOADED
E/LoginActivity$login: LoadingState Observer triggered
LOADED
D/OnePlusJankManager: Chor uploadMDM JANK_TYPE_ONCE mViewTitle = com.weedmanager.myweedmanager/com.weedmanager.myweedmanager.authentication.LoginActivity--- jank level = 1
V/FA: Recording user engagement, ms: 1494
W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@c6ecc8e
V/FA: Activity paused, time: 1057027342
D/FA: Event not sent since app measurement is disabled
V/FA: onActivityCreated
E/MainActivity: MainActivity onCreate
现在当神奇发生时注销后：
E/LoginViewModel: enter try block outside viewModelScope.launch
D/FA: Event not sent since app measurement is disabled
E/LoginActivity$login: LoadingState Observer triggered
E/LoginActivity$login: LOADED
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
V/FA: Recording user engagement, ms: 8496
V/FA: Connecting to remote service
V/FA: Activity paused, time: 1057275561
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
D/FA: Event not sent since app measurement is disabled
W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@24faad3
E/MainActivity: MainActivity onCreate
所以我们可以清楚的看到在viewModelScope.launch里面的try块里面没有进入，因为没有显示日志，也没有请求（profiler空也）但是没有 Exception 被捕获在 viewModelScope.launch
周围的 try/catch 块中
确实，当我使用 breakpoint 和 step over.
调试我的代码时，我发现了 JobCancellationException
我试图通过从 viewModelScope.launch 更改为 CoroutineScope(Dispatchers.IO).launch 来更改我的范围（只是根据问题下方的评论使用此范围进行测试）并且它崩溃了。
我终于解决了我的问题。事实上，我正在使用 Koin 作为 dependency injection。
我只是简单地替换了 single:
val viewModelModule = module {
single { StatsViewModel(get()) }
single{ LoginViewModel(get(), get()) }
}
按视图模型：
val viewModelModule = module {
viewModel { StatsViewModel(get()) }
viewModel { LoginViewModel(get(), get()) }
}
事实上，single 是一个单例，因此通过使用 viewModel 关键字，viewModel 绑定到 Android 组件生命周期。
https://insert-koin.io/docs/reference/koin-android/viewmodel/
所以，就我而言，我使用的是 liveData 生成器，
在收到单个值后，在观察者端，我正在删除观察者，
所以在调用 remove observer 时，livedata builder 的协程被取消，抛出 JobCancellationException，所以解决方案很简单，我在获取新的实时数据时调用了 remove observer 所以对于之前的我们可以使用 remove oberserver.
我正在 MVVM 架构中实现 kotlin coroutines 以替换我的 RxJava 依赖项。
我的问题:
注销后（这个细节很重要，因为我在重新开始时没有异常），我在 viewModelScope AND[ 的启动时抛出了 JobCancellationException 协程异常=107=] 我在 LoginActivity 中的所有 observers 都被触发（wtf？）即使 try/catch 块没有执行（断点）所以它完全破坏了我的代码逻辑。
我的图层如下：
Activity，setOnClickListener触发，调用viewModel函数-> ViewModel，在viewModelScope内创建coroutine并调用 suspend function -> Repository, suspended function 从 viewModel 调用并调用 suspend function in ApiService -> suspend function 调用 Api
用例：
我登录了刚启动的应用程序 (LoginActivity)。我的堆栈被清除以启动 MainActivity。我去 SettingsActivity 注销。我注销并再次清除堆栈以开始一个全新的 LoginActivity。当我再次尝试登录时，我抛出了 exception 并触发了我的 observers。
登录活动：
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_login)
tvLogin.setSafeOnClickListener { login() }
}
private fun login() {
Firebase.analytics.logEvent("hit_login", null)
runOnUiThread {
pDialog = SweetAlertDialog(this, SweetAlertDialog.PROGRESS_TYPE)
pDialog!!.progressHelper.barColor = Color.parseColor("#2A6022")
pDialog!!.titleText =
"<font color='#2A6022'>" + resources.getString(R.string.signing) + "</font>"
pDialog!!.setCancelable(false)
}
var pwd = etPassword.text.toString()
if (passedBiometric) {
pwd = sessionManager.decrypt(sessionManager.loadUsername())
}
passedBiometric = false
viewModel.login(etUsername.text.toString(), pwd)
viewModel.error.observe(this, {
Toast.makeText(this, getString(it), Toast.LENGTH_SHORT).show()
})
viewModel.loadingState.observe(this, {
Timber.e("LoadingState Observer triggered")
when (it) {
LoadingState.LOADED -> {
pDialog!!.dismiss()
Timber.e("LOADED")
startMainActivity()
}
LoadingState.FAILED -> {
pDialog!!.dismiss()
Timber.e("FAILED")
viewModel.error.value?.let { errorRsc ->
Toast.makeText(this, getString(errorRsc), Toast.LENGTH_SHORT).show()
}
}
LoadingState.LOADING -> {
pDialog!!.show()
Timber.e("LOADING")
}
}
})
}
private fun startMainActivity() {
val intent = Intent(this, MainActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
intent.action = this.intent.action
intent.putExtra(ProfileFragment.USER, viewModel.user.value)
startActivity(intent)
finish()
}
登录视图模型：
class LoginViewModel(private val repo: ApiRepository, private val sessionManager: SessionManager) :
ViewModel() {
private val _error = MutableLiveData<Int>()
val error: LiveData<Int>
get() = _error
private val _loadingState = MutableLiveData<LoadingState>()
val loadingState: LiveData<LoadingState>
get() = _loadingState
private val token = MutableLiveData<SessionToken>()
private val _user = MutableLiveData<User>()
val user: LiveData<User>
get() = _user
fun login(username: String, password: String) {
try {
Timber.e("enter try block outside viewModelScope.launch")
viewModelScope.launch {
try {
Timber.e("try block inside viewModelScope.launch")
_loadingState.value = LoadingState.LOADING
token.value = repo.login(username, password)
sessionManager.storeSessionToken(token.value!!.token)
sessionManager.storeUsername(username)
sessionManager.encrypt(username, password)
_user.value = repo.getUser()
_loadingState.value = LoadingState.LOADED
} catch (e: Exception) {
Timber.e("catch block inside viewModelScope.launch")
if (e is HttpException) {
when (e.code()) {
500, 503 -> {
_error.value = R.string.error_api_down
}
400 -> {
_error.value = R.string.error_bad_credentials
}
}
}
_loadingState.value = LoadingState.FAILED
}
}
}
catch (e: Exception){
Timber.e("Catch block outside viewmodelScope.launch")
when (e){
is CancellationException -> { Timber.e("CancellationException caught")}
else -> { Timber.e("Unknown caught")}
}
}
}
}
Api存储库：
class ApiRepository(
private val apiService: ApiService,
private val sessionManager: SessionManager
) {
suspend fun login(username: String, password: String): SessionToken {
val map = mutableMapOf<String, String>()
map["username"] = username
map["password"] = password
return apiService.login(
JSONObject(map.toMap()).toString()
.toRequestBody("application/json".toMediaTypeOrNull())
)
}
suspend fun getUser(): User {
return apiService.getUser(sessionManager.loadSessionToken())
}
}
Api服务：
interface ApiService {
companion object {
private const val AUTH = "Authorization"
}
@POST(ApiRouting.URL_TOKEN)
suspend fun login(@Body requestBody: RequestBody): SessionToken
@GET(ApiRouting.URL_GET_USER)
suspend fun getUser(@Header(AUTH) token: String): User
}
设置活动：
private fun initListeners() {
tvLogout.setSafeOnClickListener {
DashboardManager.clearValues()
sessionManager.clearSessionToken()
val intent = Intent(this, LoginActivity::class.java)
intent.flags = Intent.FLAG_ACTIVITY_NEW_TASK or Intent.FLAG_ACTIVITY_CLEAR_TASK
startActivity(intent)
finish()
}
}
TLDR：为什么抛出异常？为什么观察者被触发？为什么这种情况只发生在注销后而不是重新开始时？
我尝试在启动中添加 coroutineScope 并使用 withContext(Dispatchers.IO) 在存储库中添加另一个范围，但它没有改变任何东西
我是 kotlin coroutines 的初学者，所以如果您有任何建议，link 或任何可能有帮助的欢迎。或者，如果您需要任何其他代码块，请告诉我。
编辑：
我添加了几个日志（LoginViewModel 和 MainActivity）来详细说明当我进入我的 viewModelScope.launch 周围的 try catch 块时以及我的 MainActivity 开始时（我的 [= 之后的下一个动作） 49=] 在 LoginAvtivity.
为了让您更清楚地了解全新（和成功）的开始是什么样的：
E/LoginViewModel: enter try block outside viewModelScope.launch
E/LoginViewModel$login: try block inside viewModelScope.launch
E/LoginActivity$login: LoadingState Observer triggered
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
E/LoginActivity$login: LOADING
LoadingState Observer triggered
LOADING
I/okhttp.OkHttpClient: --> POST http://45.153.184.141/api-token-auth/
Content-Type: application/json; charset=utf-8
Content-Length: 46
--> END POST (46-byte body)
E/LoginActivity$login: LoadingState Observer triggered
LOADING
D/DecorView: onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@7175d32[LoginActivity]
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
I/okhttp.OkHttpClient: <-- 200 OK http://xx.xx.xx.xx/api-token-auth/ (237ms)
Date: Wed, 03 Mar 2021 21:31:39 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: application/json
Allow: POST, OPTIONS
X-Frame-Options: DENY
Content-Length: 52
Vary: Cookie
X-Content-Type-Options: nosniff
<-- END HTTP (52-byte body)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->putInt(Ljava/lang/Object;JI)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
D/TransportRuntime.SQLiteEventStore: Storing event with priority=DEFAULT, name=FIREPERF for destination cct
D/TransportRuntime.JobInfoScheduler: Scheduling upload for context TransportContext(cct, DEFAULT, MSRodHRwczovL2ZpcmViYXNlbG9nZ2luZy1wYS5nb29nbGVhcGlzLmNvbS92MS9maXJlbG9nL2xlZ2FjeS9iYXRjaGxvZ1xBSXphU3lDY2traUg4aTJaQVJ3T3MxTEV6RktsZDE1YU9HOG96S28=) with jobId=877081683 in 30000ms(Backend next call timestamp 1614807010307). Attempt 1
I/okhttp.OkHttpClient: --> GET http://45.153.184.141/api/users/profile/
Authorization: Token token
--> END GET
D/OnePlusJankManager: Chor uploadMDM JANK_TYPE_ONCE mViewTitle = com.weedmanager.myweedmanager/com.weedmanager.myweedmanager.authentication.LoginActivity--- jank level = 1
I/okhttp.OkHttpClient: <-- 200 OK http://45.153.184.141/api/users/profile/ (83ms)
Date: Wed, 03 Mar 2021 21:31:40 GMT
Server: WSGIServer/0.2 CPython/3.8.2
Content-Type: application/json
Vary: Accept
Allow: GET, HEAD, OPTIONS
X-Frame-Options: DENY
Content-Length: 103
X-Content-Type-Options: nosniff
<-- END HTTP (103-byte body)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->putObject(Ljava/lang/Object;JLjava/lang/Object;)V (greylist, linking, allowed)
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getInt(Ljava/lang/Object;J)I (greylist, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getObject(Ljava/lang/Object;J)Ljava/lang/Object; (greylist, linking, allowed)
E/LoginActivity$login: LoadingState Observer triggered
W/r.myweedmanage: Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
Accessing hidden method Lsun/misc/Unsafe;->getLong(Ljava/lang/Object;J)J (greylist,core-platform-api, linking, allowed)
E/LoginActivity$login: LOADED
D/TransportRuntime.SQLiteEventStore: Storing event with priority=DEFAULT, name=FIREPERF for destination cct
D/DecorView: onWindowFocusChangedFromViewRoot hasFocus: true, DecorView@4a8ec73[LoginActivity]
D/TransportRuntime.JobInfoScheduler: Upload for context TransportContext(cct, DEFAULT, MSRodHRwczovL2ZpcmViYXNlbG9nZ2luZy1wYS5nb29nbGVhcGlzLmNvbS92MS9maXJlbG9nL2xlZ2FjeS9iYXRjaGxvZ1xBSXphU3lDY2traUg4aTJaQVJ3T3MxTEV6RktsZDE1YU9HOG96S28=) is already scheduled. Returning...
E/LoginActivity$login: LoadingState Observer triggered
LOADED
E/LoginActivity$login: LoadingState Observer triggered
LOADED
D/OnePlusJankManager: Chor uploadMDM JANK_TYPE_ONCE mViewTitle = com.weedmanager.myweedmanager/com.weedmanager.myweedmanager.authentication.LoginActivity--- jank level = 1
V/FA: Recording user engagement, ms: 1494
W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@c6ecc8e
V/FA: Activity paused, time: 1057027342
D/FA: Event not sent since app measurement is disabled
V/FA: onActivityCreated
E/MainActivity: MainActivity onCreate
现在当神奇发生时注销后：
E/LoginViewModel: enter try block outside viewModelScope.launch
D/FA: Event not sent since app measurement is disabled
E/LoginActivity$login: LoadingState Observer triggered
E/LoginActivity$login: LOADED
V/ViewRootImpl: The specified message queue synchronization barrier token has not been posted or has already been removed
V/FA: Recording user engagement, ms: 8496
V/FA: Connecting to remote service
V/FA: Activity paused, time: 1057275561
W/Choreographer: Already have a pending vsync event. There should only be one at a time.
D/FA: Event not sent since app measurement is disabled
W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@24faad3
E/MainActivity: MainActivity onCreate
所以我们可以清楚的看到在viewModelScope.launch里面的try块里面没有进入，因为没有显示日志，也没有请求（profiler空也）但是没有 Exception 被捕获在 viewModelScope.launch
try/catch 块中
确实，当我使用 breakpoint 和 step over.
JobCancellationException
我试图通过从 viewModelScope.launch 更改为 CoroutineScope(Dispatchers.IO).launch 来更改我的范围（只是根据问题下方的评论使用此范围进行测试）并且它崩溃了。
我终于解决了我的问题。事实上，我正在使用 Koin 作为 dependency injection。
我只是简单地替换了 single:
val viewModelModule = module {
single { StatsViewModel(get()) }
single{ LoginViewModel(get(), get()) }
}
按视图模型：
val viewModelModule = module {
viewModel { StatsViewModel(get()) }
viewModel { LoginViewModel(get(), get()) }
}
事实上，single 是一个单例，因此通过使用 viewModel 关键字，viewModel 绑定到 Android 组件生命周期。
https://insert-koin.io/docs/reference/koin-android/viewmodel/
所以，就我而言，我使用的是 liveData 生成器， 在收到单个值后，在观察者端，我正在删除观察者， 所以在调用 remove observer 时，livedata builder 的协程被取消，抛出 JobCancellationException，所以解决方案很简单，我在获取新的实时数据时调用了 remove observer 所以对于之前的我们可以使用 remove oberserver.