DatePicker.OnDateChangedListener called twice

Question

I\'m trying to create an app where the user selects a date from a DatePicker, and then a list is updated with some values.

My GUI looks like this:

Answer 1

I created a SupportDatePickerDialog.kt class

    import android.app.DatePickerDialog
    import android.content.Context
    import android.os.Build
    import android.widget.DatePicker
    import androidx.appcompat.view.ContextThemeWrapper
    
    /**
     * Support [DatePickerDialog]
     * for working around Samsung 5 [java.util.IllegalFormatConversionException] bug.
     * > Fatal Exception: java.util.IllegalFormatConversionException: %d can't format java.lang.String arguments
     * http://stackoverflow.com/a/31855744/570168
     * for OnDateSetListener called twice bug
     * https://stackoverflow.com/questions/12436073/datepicker-ondatechangedlistener-called-twice
     *
     */
    
    
    
    class SupportDateSetListener(private val function: (DatePicker, Int, Int, Int) -> Unit) : DatePickerDialog.OnDateSetListener {
        override fun onDateSet(view: DatePicker, year: Int, month: Int, dayOfMonth: Int) {
            if (view.isShown) {
                function.invoke(view, year, month, dayOfMonth)
            }
        }
    }
    
    class SupportDatePickerDialog(context: Context, listener: SupportDateSetListener, year: Int, month: Int, dayOfMonth: Int) : DatePickerDialog(fixContext(context), listener, year, month, dayOfMonth) {
        companion object {
            /**
             * Wraps the [Context] to use the holo theme to avoid stupid bug on Samsung devices.
             */
            @Suppress("DEPRECATION")
            private fun fixContext(context: Context): Context {
                return if (isBrokenSamsungDevice) {
                    ContextThemeWrapper(context, android.R.style.Theme_Holo_Light_Dialog)
                } else {
                    context
                }
            }
    
            /**
             * Affected devices:
             * - Samsung 5.0
             * - Samsung 5.1
             *
             * @return true if device is affected by this bug.
             */
            @Suppress("SpellCheckingInspection")
            private val isBrokenSamsungDevice: Boolean
                get() = (Build.MANUFACTURER.equals("samsung", ignoreCase = true)
                        && Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP && Build.VERSION.SDK_INT <= Build.VERSION_CODES.LOLLIPOP_MR1)
        }
    }

Usage :

val calendar = Calendar.getInstance()
val supportDatePickerDialog = SupportDatePickerDialog(this, SupportDateSetListener { datePicker: DatePicker, year: Int, month: Int, dayOfMonth: Int ->
    //TODO
}, calendar[Calendar.YEAR], calendar[Calendar.MONTH], calendar[Calendar.DAY_OF_MONTH])

supportDatePickerDialog.show()