我正在创建一个自定义对话框,但是当用户第二次打开它时,出现此异常:指定的孩子已经有一个父母。您必须先在孩子的父母上调用removeView()
我试图在mDialog上调用removeView,但不能。这个错误很常见,因此我尝试在其他帖子上实施解决方案。当膨胀mCustomDatePicker时,我尝试将根(在构造函数中)设置为膨胀视图的父级,但无济于事。
class SignupStageOne : AppCompatActivity() {
private var mCalendar : Calendar? = null
private var day: Int? = null
private var month: Int? = null
private var year: Int? = null
private var age: String? = null
private val firebaseDatabase = FirebaseDatabase.getInstance().reference
private val firebaseAuth = FirebaseAuth.getInstance()
val user = firebaseAuth.currentUser
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(com.example.meet.R.layout.activity_signup_stage_one)
val mCustomDatePicker = layoutInflater.inflate(com.example.meet.R.layout.custom_date_picker, datePickerLayout, false)
var mDatePicker = mCustomDatePicker.findViewById(com.example.meet.R.id.mDatePicker) as DatePicker
mDatePicker.maxDate = (Calendar.getInstance().getTime().getTime())
val mDialog = AlertDialog.Builder(this)
mDialog.setView(mCustomDatePicker)
mDialog.setPositiveButton("OK", object : DialogInterface.OnClickListener {
override fun onClick( dialog: DialogInterface, which: Int) {
}
}).setNegativeButton("Cancel", object: DialogInterface.OnClickListener {
@Override
override fun onClick( dialog: DialogInterface, which: Int) {
dialog.dismiss()
}
})
mDialog.create()
ageET.setOnFocusChangeListener{ view, hasFocus ->
if (hasFocus) {
mDialog.show()
}
}
}
我也试图像这样使视图膨胀:
layoutInflater.inflate(com.example.meet.R.layout.custom_date_picker, null, false)
但是没有帮助。
我的XML:
<RelativeLayout
android:id="@+id/datePickerLayout"
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center">
<DatePicker
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/mDatePicker"
android:layout_gravity="center_horizontal"
android:spinnersShown="true"
android:calendarViewShown="false"
android:layout_alignParentTop="true"/>
</RelativeLayout>
由于我对Kotlin的了解不足,无法解决这个问题,在访问mCustomDatePicker
的父级时,我们必须将其强制转换为ViewGroup:
override fun onClick( dialog: DialogInterface, which: Int) {
ageET.clearFocus()
val parent = mCustomDatePicker.parent as ViewGroup?
parent?.removeAllViews()
dialog.dismiss()
}
解决了问题。