[英]Assignments are not expressions and only expressions are allowed in this context - Kotlin
[英]Assignments are not expressions, and only expressions are allowed in this context i know its alreaduy disccused but didn't unders
分配不是表達式,並且在這種情況下僅允許表達式我不知道如何解決此問題
private fun uploadImageToFirebaswStorage(){
if (selectedphotoUri = null) return
val filename = UUID.randomUUID().toString()
val ref = FirebaseStorage.getInstance().getReference("/images/$filename")
ref.putFile(selectedphotoUri!!)
.addOnSuccessListener {
Log.d("Register","Successfully uploaded image: ${it.metadata?.path}")}
selectedphotoUri = null
是一個分配。 您最有可能希望selectedphotoUri == null
(兩個等號),這是等式表達式。
假設您要按照CommonsWare的說明進行相等性檢查,另一種選擇是使用涉及 let的通用Kotlin習慣用語
值= ...
值?.let {... //如果不為null,則執行此塊}
private fun uploadImageToFirebaswStorage(){
selectedphotoUri?.let {
val filename = UUID.randomUUID().toString()
val ref = FirebaseStorage.getInstance().getReference("/images/$filename")
ref.putFile(selectedphotoUri!!)
.addOnSuccessListener {
Log.d("Register","Successfully uploaded image: ${it.metadata?.path}")
}
}
}
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