Android 第三十六章 DatePickerDialog

        val calendar = Calendar.getInstance()
        val dialog = DatePickerDialog(this, { _, year, monthOfYear, dayOfMonth -> Toast.makeText(this, "$year-${monthOfYear + 1}-$dayOfMonth", Toast.LENGTH_LONG).show() },
            calendar.get(Calendar.YEAR),
            calendar.get(Calendar.MONTH),
            calendar.get(Calendar.DAY_OF_MONTH)
        )
        dialog.setCancelable(true)
        dialog.show()
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