我已经实现了一个
我遵守了Android文档中Spinner示例中的所有要求,包括将
我也通过
ArrayAdapter
来填充我的Spinner
视图。Spinner
可以正常工作,但是Android无法检测到我点击了Spinner中的项。我遵守了Android文档中Spinner示例中的所有要求,包括将
AdapterView.OnItemSelectedListener
实现到我的Activity并覆盖了它的两个方法OnItemSelectedListener
和onNothingSelected
,但是这些方法中没有任何一个Log
语句打印,所以它们没有被调用。我也通过
choose_user.onItemSelectedListener = this@PlayerDetails
将监听器设置到了我的spinner。
这是我的Activity:
class PlayerDetails : AppCompatActivity(), View.OnClickListener, TextWatcher, AdapterView.OnItemSelectedListener {
val TAG: String = "PlayerDetails"
val FirebaseTAG: String = "FirebaseDebug"
var numOfPlayers: Int = 1
var currentPlayer: Int = 1
var name: String = ""
var age: Int = 0
var genderId: Int = 0
var genderResult: String = ""
val db = FirebaseFirestore.getInstance()
var users: MutableList<String> = mutableListOf()
private lateinit var binding: ActivityPlayerDetailsBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val sharedPref = this@PlayerDetails.getPreferences(Context.MODE_PRIVATE)
val applicationID: String? = sharedPref.getString("applicationID", null)
binding = DataBindingUtil.setContentView(this, R.layout.activity_player_details)
if (applicationID != null) {
db.collection("phones").document(applicationID)
.collection("users")
.get()
.addOnSuccessListener { result ->
for (document in result){
val name = document.get("name").toString()
users.add(name)
}
}
Log.d(FirebaseTAG, users.toString())
val spinnerAdaptor = ArrayAdapter<String>(this@PlayerDetails, android.R.layout.simple_spinner_item, users)
spinnerAdaptor.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
choose_user?.adapter = spinnerAdaptor
choose_user.onItemSelectedListener = this@PlayerDetails
}
val intent = getIntent()
numOfPlayers = intent.getIntExtra("number_of_players", 1)
next_details.setOnClickListener(this)
player_name.addTextChangedListener(this)
player_age.addTextChangedListener(this)
gender.setOnCheckedChangeListener(object: RadioGroup.OnCheckedChangeListener {
override fun onCheckedChanged(radiogroup: RadioGroup, checked: Int) {
if (fieldsArePopulated()) next_details.visibility = View.VISIBLE
}
})
}
override fun onItemSelected(parent: AdapterView<*>?, name: View?, position: Int, rowId: Long) {
val chosenName: String = parent?.getItemAtPosition(position).toString()
Log.d("ChosenName", chosenName)
Log.d("adapterclicked", "adapterclicked")
}
override fun onNothingSelected(parent: AdapterView<*>?) {
Log.d("Nothing", "NOTHINGCALLED")
}
...
您有任何想法是什么问题吗?
此外,当我在Spinner中选择一个项目时,紧挨着我的Spinner的视图会移动,因此显然已被检测到,但onItemSelected()
仍未被调用。
onItemSelected()
被调用了。你在里面放了断点吗? - forpasvar users: MutableList<String> = mutableListOf("Choose User")
设置了初始值,现在onItemSelected()成功被调用。感谢您提供的调试提示。 - Zorgan