I have an array list in kotlin and I want to remove all item from it, leave it as an empty array to start adding new dynamic data. i tried ArrayList.remove(index)
arrayList.drop(index)
but none works,
The Declaration:
var fromAutoCompleteArray: List<String> = ArrayList()
以下是我的try 方式:
for (item in fromAutoCompleteArray){
fromAutoCompleteArray.remove(0)
}
I'm using the addTextChangedListener
to remove old data and add new data based on user's input:
private fun settingToAutoComplete() {
val toAutoCompleteTextView: AutoCompleteTextView =
findViewById<AutoCompleteTextView>(R.id.toAutoCompleteText)
toAutoCompleteTextView.addTextChangedListener(object : TextWatcher {
override fun beforeTextChanged(s: CharSequence?, start: Int, count: Int, after: Int) {
}
override fun afterTextChanged(s: Editable?) {
doLocationSearch(toAutoCompleteTextView.text.toString(), 2)
}
override fun onTextChanged(s: CharSequence?, start: Int, before: Int, count: Int) {
toAutoCompleteTextView.postDelayed({
toAutoCompleteTextView.showDropDown()
}, 10)
}
})
val adapter = ArrayAdapter(this, android.R.layout.select_dialog_item, toAutoCompleteArray)
toAutoCompleteTextView.setAdapter(adapter)
toAutoCompleteTextView.postDelayed({
toAutoCompleteTextView.setText("")
toAutoCompleteTextView.showDropDown()
}, 10)
}
And here is the function that adds the data :
private fun doLocationSearch(keyword: String, fromTo: Number) {
val baseURL = "api.tomtom.com"
val versionNumber = 2
val apiKey = "******************"
val url =
"https://$baseURL/search/$versionNumber/search/$keyword.json?key=$apiKey"
val client = OkHttpClient()
val request = Request.Builder().url(url).build()
client.newCall(request).enqueue(object : Callback {
override fun onResponse(call: Call, response: okhttp3.Response) {
val body = response.body?.string()
println("new response is : $body")
val gson = GsonBuilder().create()
val theFeed = gson.fromJson(body, TheFeed::class.java)
if (theFeed.results != null) {
for (item in theFeed.results) {
println("result address ${item.address.freeformAddress} ")
if (fromTo == 1) {
fromAutoCompleteArray = fromAutoCompleteArray + item.address.freeformAddress
println(fromAutoCompleteArray.size)
} else {
toAutoCompleteArray = toAutoCompleteArray + item.address.freeformAddress
}
}
} else {
println("No Locations found")
}
}
override fun onFailure(call: Call, e: IOException) {
println("Failed to get the data!!")
}
})
}
正如你所看到的,第println(fromAutoCompleteArray.size)
行告诉我它是否被删除了,而且它总是在增加.
此外,try 在没有循环的情况下使用clear()
,但都不起作用:
fromAutoCompleteArray.clear()