安卓材料日期选择器日期格式

Question

我在应用程序中使用材料日期选择器来选择日期。下面是我的代码。

MaterialDatePicker.Builder builder = MaterialDatePicker.Builder.datePicker();
builder.setSelection(Calendar.getInstance().getTimeInMillis());
builder.setTitleText(getString(R.string.selectDate));
final MaterialDatePicker materialDatePicker = builder.build();
btn_pickDate(new View.OnClickListener() {
@Override
public void onClick(View v) {
materialDatePicker.show(getSupportFragmentManager(),"DATE_PICKER");
}
});

materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener() {
@Override
public void onPositiveButtonClick(Object selection) {
startDate.setText(materialDatePicker.getHeaderText());
}
});

当我选择一个日期时，在设备一中，日期以dd-MMM yyyy返回，在设备二中以MMM dd，yyyy返回。

我需要在所有设备上以相同的格式返回日期(例如：dd-MMM yyyy(。如何在物料日期选择器中实现这一点。

Answer 1

addOnPositiveButtonClickListener侦听器将所选日期返回为Long值。通过这种方式，您有一个长值，而不是字符串。

您可以使用：

MaterialDatePicker<Long> materialDatePicker = builder.build();

materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener<Long>() {
@Override
public void onPositiveButtonClick(Long selection) {
//....
Calendar calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"));
calendar.setTimeInMillis(selection);
SimpleDateFormat format = new SimpleDateFormat("yyyy MM dd");
String formattedDate  = format.format(calendar.getTime());
}
});

在科特林：

materialDatePicker.addOnPositiveButtonClickListener {
val utc = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
utc.timeInMillis = it
val format = SimpleDateFormat("yyyy-MM-dd")
val formatted: String = format.format(utc.time)        
}

Answer 2

如果您想更改MaterialPicker日期格式，请使用以下代码，此代码适用于我。

MaterialDatePicker<Long> materialDatePicker=materialDateBuilder.build();
materialDatePicker.addOnPositiveButtonClickListener(new MaterialPickerOnPositiveButtonClickListener<Long>() {
@Override
public void onPositiveButtonClick(Long selection) {
// Get the offset from our timezone and UTC.
TimeZone timeZoneUTC = TimeZone.getDefault();
// It will be negative, so that's the -1
int offsetFromUTC = timeZoneUTC.getOffset(new Date().getTime()) * -1;
// Create a date format, then a date object with our offset
SimpleDateFormat simpleFormat = new SimpleDateFormat("yyyy-MM-dd", Locale.US);
Date date = new Date(selection + offsetFromUTC);
mEt_last_date_to_apply.setText(simpleFormat.format(date));
}
});

Answer 3

您应该根据自己的选择使用SimpleDateFormat来格式化日期。

@Override
public void onDateSet(DatePickerDialog view, int Year, int Month, int Day) {
Calendar selectedDate = Calendar.getInstance().set(Year,Month,Day);
DateFormat formatter = new SimpleDateFormat("dd-MM-yyyy");
String formatedDate = formatter.format(selectedDate );
//to sting desired format date
Toast.makeText(MainActivity.this, formatedDate , Toast.LENGTH_LONG).show();
}

快乐编码！

Answer 4

我的解决方案：

val builder = MaterialDatePicker.Builder.datePicker()
builder.setTitleText("Select a Date")
val picker = builder.build()
tv_rw_startDate.setOnClickListener {
picker.show(activity?.supportFragmentManager!!, picker.toString())
picker.addOnPositiveButtonClickListener {
val calendar = Calendar.getInstance(TimeZone.getTimeZone("UTC"))
calendar.time = Date(it)
tv_rw_startDate.text = "${calendar.get(Calendar.DAY_OF_MONTH)}/ " +
"${calendar.get(Calendar.MONTH) + 1}/${calendar.get(Calendar.YEAR)}"
}
}