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More Functionalities of Material Design Date Picker in Android

Material Design Date Picker in Android not only offers basic date picking functionalities but also comes with a host of customizable attributes and capabilities. Here are some of the advanced functionalities and customization options available with the Material Design Date Picker:

1. Date Constraints:

You can set constraints to allow selection only within a specific date range.

val constraintsBuilder = CalendarConstraints.Builder()

// Example: Setting range from today to 30 days from now
val startMonth = MaterialDatePicker.todayInUtcMilliseconds()
val endMonth = startMonth + TimeUnit.DAYS.toMillis(30)
constraintsBuilder.setStart(startMonth)
constraintsBuilder.setEnd(endMonth)

val datePickerBuilder = MaterialDatePicker.Builder.datePicker()
datePickerBuilder.setCalendarConstraints(constraintsBuilder.build())

2. Custom Header:

You can customize the header of the date picker using themes.

3. Custom Selection Colors:

You can change the color of the selected date.

<!-- In your styles.xml -->
<style name="DatePickerTheme" parent="ThemeOverlay.MaterialComponents.MaterialCalendar">
    <item name="colorPrimary">@color/your_color</item>
</style>

Then apply the theme:

val datePickerBuilder = MaterialDatePicker.Builder.datePicker()
datePickerBuilder.setTheme(R.style.DatePickerTheme)

4. Custom Day Validation:

You can make specific days unselectable based on custom logic, like disabling weekends.

constraintsBuilder.setValidator(object : CalendarConstraints.DateValidator {
    override fun isValid(date: Long): Boolean {
        val dayOfWeek = Calendar.getInstance().apply { timeInMillis = date }.get(Calendar.DAY_OF_WEEK)
        return dayOfWeek != Calendar.SATURDAY && dayOfWeek != Calendar.SUNDAY
    }

    override fun writeToParcel(dest: Parcel, flags: Int) {
        // Implement required parcelable methods
    }
})

5. Year Selection:

By default, the date picker starts with a month view, but you can make it start with the year view:

val datePickerBuilder = MaterialDatePicker.Builder.datePicker()
datePickerBuilder.setCalendarConstraints(constraintsBuilder.build())
datePickerBuilder.setTitleText("Select year")

6. Date Picker Mode:

You can toggle between calendar mode and spinner mode. However, note that spinner mode might not be consistent with Material Design guidelines:

<DatePicker
    android:datePickerMode="spinner" />

7. Custom Entry Types:

The Material Design Date Picker allows for picking individual dates, ranges, or even multiple individual dates:

// Single date (default)
val singleDateBuilder = MaterialDatePicker.Builder.datePicker()

// Date range
val dateRangeBuilder = MaterialDatePicker.Builder.dateRangePicker()

// Multiple dates (requires enabling in CalendarConstraints)
constraintsBuilder.setSelectionMode(CalendarConstraints.SELECTION_MODE_MULTIPLE)
val multipleDatesBuilder = MaterialDatePicker.Builder.datePicker()
multipleDatesBuilder.setCalendarConstraints(constraintsBuilder.build())

These are just a few of the extensive functionalities and customization options available with the Material Design Date Picker. The library is designed to be versatile to cater to a wide range of use cases, all while ensuring a consistent and user-friendly experience.

Customizing Material Date Picker appearance and styles:

Customize the appearance and styles using a theme that extends ThemeOverlay.MaterialComponents.MaterialCalendar. Apply it to the MaterialDatePicker instance.

<style name="CustomDatePickerTheme" parent="ThemeOverlay.MaterialComponents.MaterialCalendar">
    <!-- Add custom styling here -->
</style>

MaterialDatePicker<Long> datePicker = MaterialDatePicker.Builder.datePicker()
    .setTheme(R.style.CustomDatePickerTheme)
    .build();
datePicker.show(getSupportFragmentManager(), datePicker.toString());

Additional functionalities of MaterialDatePickerDialogFragment in Android:

MaterialDatePickerDialogFragment provides additional functionalities like setting calendar constraints, displaying title text, and allowing user input.

MaterialDatePicker.Builder<Long> builder = MaterialDatePicker.Builder.datePicker();
builder.setTitleText("Select a Date");
builder.setCalendarConstraints(constraints);
MaterialDatePicker<Long> datePicker = builder.build();
datePicker.show(getSupportFragmentManager(), datePicker.toString());

Range selection in Material Design Date Picker for Android:

Enable range selection by using MaterialDatePicker.Builder.rangePicker().

MaterialDatePicker<Pair<Long, Long>> rangeDatePicker = MaterialDatePicker.Builder.rangePicker().build();
rangeDatePicker.show(getSupportFragmentManager(), rangeDatePicker.toString());

Styling and theming Material Design Date Picker in Android:

Apply custom styles and themes to match your app's design.

<style name="CustomDatePickerTheme" parent="ThemeOverlay.MaterialComponents.MaterialCalendar">
    <!-- Add custom styling here -->
</style>

MaterialDatePicker<Long> datePicker = MaterialDatePicker.Builder.datePicker()
    .setTheme(R.style.CustomDatePickerTheme)
    .build();
datePicker.show(getSupportFragmentManager(), datePicker.toString());

Handling events and callbacks with Material Date Picker:

Implement listeners to handle events like date selection or range selection.

datePicker.addOnPositiveButtonClickListener(selection -> {
    // Handle date selection
});

rangeDatePicker.addOnPositiveButtonClickListener(selection -> {
    // Handle range selection
});

Using Material Design Date Picker with different locales:
- Set the desired locale to display date and time components in different languages.
```
datePicker.setLocale(Locale.FRANCE);
```

Working with time components in Material Date Picker:

Use MaterialDatePicker.Builder to create a date and time picker.

MaterialDatePicker<Long> dateTimePicker = MaterialDatePicker.Builder.datePicker()
    .setSelection(MaterialDatePicker.todayInUtcMilliseconds())
    .build();

dateTimePicker.show(getSupportFragmentManager(), dateTimePicker.toString());

Material Design Date Picker library and extensions in Android:
- The Material Design Date Picker is part of the Material Components library. Ensure that you include the library in your project:
```
implementation 'com.google.android.material:material:1.5.0'
```
- Check the official documentation for any updates or additional features.