In Kotlin, What's the best way to iterate through an Android Cursor object and put the results into a list?
我的自动转换Java:
val list = ArrayList<String>()
while (c.moveToNext()) {
list.add(getStringFromCursor(c))
}
Is there a more idiomatic way? In particular, can it be done in a single assignment of a read-only list? E.g....
val list = /*mystery*/.map(getStringFromCursor)
...或某种其他布置，其中列表被分配为完全形成的.
This is what I went with in the end, using kotlin.sequences.generateSequence...
val list = generateSequence { if (c.moveToNext()) c else null }
.map { getStringFromCursor(it) }
.toList()
我的第一次try 稍微短了一点:
val list = (1 .. c.count).map {
c.moveToNext()
getStringFromCursor(c)
}
Both versions rely on the cursor initially being positioned before the first record (as a new cursor is). The second would throw if that wasn't the case, while the first would return a shorter list.