[英]java.lang.NumberFormatException: For input string: "5.3"
[英]java.lang.NumberFormatException: For input string:"something"
我试图将一个字符串拆分为两个变量,一个是字符串,一个是 Long。 它工作,当我记录它时,我可以看到它,我可以将它插入到房间数据库中,但我不知道为什么“有时”我会收到这个错误。 像这样的字符串
m8fw5sMdAcaX4Ezv7vzImeRAjkq2_1635234951781
java.lang.NumberFormatException: For input string: "m8fw5sMdAcaX4Ezv7vzImeRAjkq2"
at java.lang.Long.parseLong(Long.java:594)
at java.lang.Long.parseLong(Long.java:636)
at com.animals.snowy.MainActivity$insertMessage$1$messageListener$1.onChildAdded(MainActivity.kt:88)
我的模特
@IgnoreExtraProperties
@Entity(tableName = "message_table")
data class MessageModel(
@NonNull
@PrimaryKey
var messageId: String = "",
var messageType: String? = null,
var messageTimestamp: Long? = null,
var messageData: String? = null,
var messageSenderId: String? = null,
var roomId: String = "",
var isSeen: Boolean = false,
var uploadSuccess : Boolean = false
) : Serializable {
}
这是我的代码,我想获取朋友的新消息,所以我从房间数据库中获取列表朋友并使用 for 循环获取 roomId(我和我朋友的子容器消息的名称)。
private fun insertMessage() {
viewModel.readRoomIdFriendsDAO().observe(this, { listRoomId ->
if (listRoomId != null && listRoomId.isNotEmpty()) {
for (item in listRoomId) {
val messageListener = object : ChildEventListener {
override fun onChildAdded(snapshot:DataSnapshot,previousChildName: String?) {
val messageModel: MessageModel? =
snapshot.getValue(MessageModel::class.java)
if (messageModel != null) {
messageModel.messageId = snapshot.key.toString().trim()
messageModel.roomId = item
messageModel.uploadSuccess = true
val listTemp = messageModel.messageId.split("_")
messageModel.messageSenderId = listTemp[0]
messageModel.messageTimestamp = listTemp[1].trim().toLong()
Log.e(TAG,"senderId: ${messageModel.messageSenderId}")
Log.e(TAG,"timestamp: ${messageModel.messageTimestamp}")
// messageViewModel.insertMessageDAO(messageModel)
}
}
override fun onChildChanged(
snapshot: DataSnapshot,
previousChildName: String?
) {
}
override fun onChildRemoved(snapshot: DataSnapshot) {
}
override fun onChildMoved(
snapshot: DataSnapshot,
previousChildName: String?
) {
TODO("Not yet implemented")
}
override fun onCancelled(error: DatabaseError) {
TODO("Not yet implemented")
}
}
messageRef
.child(item)
.addChildEventListener(messageListener)
}
}
})
}
每当编译器尝试将无效输入类型转换为 number 时,就会抛出java.lang.NumberFormatException
。
例如:
String validInputToCast = "123456789";
Long validInputToCast = validInputToCast.toLong(); // this casting will succeed.
String invalidInputToCast = "abce124";
Long invalidCastedInput = inputToCast.toLong(); // compiler will throw number exception on this line.
尝试调试下面的行,希望您能找到错误。
messageModel.messageTimestamp = listTemp[1].trim().toLong()
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