CODEWITHSUNDEEP
javaandroidkotlin
rats
rats

Reputation: 1

how to add a double type in kotlin hashmap?

I have code :

val value: HashMap<String, Any> = hashMapOf()
value["sender_id"] = userId!!
value["name"] = firstname!!
value["text"] = et_search_box.text.toString()
value["avatar"] = avatar!!
value["date"] = ServerValue.TIMESTAMP.toDouble()

how to add date types to double?

example code

Upvotes: 0

Views: 642

Answers (2)

Animesh Sahu
Animesh Sahu

Reputation: 8106

Firebase Timestamp is has two specific functions getSeconds() and getNanoseconds() to resolve the time in any other units.

For example to get the time in seconds with upto 9 digits of accuracy (nano second accuracy)

val timestampInSeconds: Double = ServerValue.TIMESTAMP.run {
    getSeconds().toDouble + getNanoseconds.toDouble() / 1_000_000_000
}

This is very accurate, however timestamps are usually represented by milliseconds and can easily be deserialized to a Date object if you want to, for instance java.util.Date uses millisecond value to evaluate the date object.

To get standard millisecond value:

val stdTimestampMillis: Long = ServerValue.TIMESTAMP.toDate().getTime()

// to deserialize it to Timestamp/Date object later
val date: Date = Date(stdTimestampMillis)
val timestamp: Timestamp = Timestamp(date)

Upvotes: 1

Vihang Patil
Vihang Patil

Reputation: 171

Looking at the image from the link you have shared, ServerValue.TIMESTAMP is of type String.

Depending on the date-format, you need to parse the String to some Time object.
Then that can be converted to double.
For e.g., I have used java.time.Instant to convert ISO 8601 date string to double.

val instant = Instant.parse("2020-05-13T05:05:52.945571Z")
val d: Double = instant.epochSecond + instant.nano / 1_000_000_000.0

Note for Android: java.time.Instant is available since Java 8.

Upvotes: 1

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