分类器＆＃x27; ioexception＆＃x27;没有伴侣对象，因此必须在此处初始化
我正在尝试从偏好数据存储中读取数据并遇到此意外错误。
这是Google link1
这是官方文档 link2
private const val DATA_STORE_NAME = "SETTINGS_STATE_OF_APP"
val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = DATA_STORE_NAME)
class PreferencesDatastore(private val context: Context) {
val readData: Flow<Model> = context.dataStore.data
.catch { exception ->
if (exception in IOException){ // here the IOException is throwing error
emit(emptyPreferences())
}else {
throw exception
}
}
.map {
}
}
同样的代码在一个较旧的项目中正常工作。
谁能告诉我如何解决这个问题？
I am trying to read data from preference datastore and getting this unexpected error.
Here's a codelab from google link1
Here's the official doc link2
private const val DATA_STORE_NAME = "SETTINGS_STATE_OF_APP"
val Context.dataStore: DataStore<Preferences> by preferencesDataStore(name = DATA_STORE_NAME)
class PreferencesDatastore(private val context: Context) {
val readData: Flow<Model> = context.dataStore.data
.catch { exception ->
if (exception in IOException){ // here the IOException is throwing error
emit(emptyPreferences())
}else {
throw exception
}
}
.map {
}
}
This same code is working fine in an older project.
Can anyone tell me how to solve this?
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问题在于使用在关键字中使用
进行测试，如果对象为给定类型而不是是。为了防止此类问题，我建议您检查 type noreferrer“ java实例运算符The problem was in using
inkeyword for testing if an object is of a given type instead ofis. To prevent these kind of problems in future I recommed you to check Type checks and casts in Kotlin and Java instanceOf Operator