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Material Design Date Picker in Android

Material Design's Date Picker provides a simple way for users to select a single date or a date range. The Date Picker component is part of the Material Components library, which is a set of components that implement the Material Design guidelines.

Here's how you can implement and use the Material Design Date Picker in Android:

1. Add the Dependency:

Ensure that you have the Material Components library added to your app's build.gradle:

implementation 'com.google.android.material:material:1.4.0'

2. Implement the Date Picker:

2.1. Single Date Selection:

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

datePicker.addOnPositiveButtonClickListener { selectedDate ->
    // selectedDate is the selected date in milliseconds since epoch
    val date = Date(selectedDate)
    // You can then format the date as you wish
}

datePicker.show(supportFragmentManager, datePicker.toString())

2.2. Date Range Selection:

val dateRangePickerBuilder = MaterialDatePicker.Builder.dateRangePicker()
val dateRangePicker = dateRangePickerBuilder.build()

dateRangePicker.addOnPositiveButtonClickListener { dateRange ->
    // dateRange.first and dateRange.second are the start and end dates of the selected range respectively
    val startDate = Date(dateRange.first)
    val endDate = Date(dateRange.second)
    // Format and use the dates as required
}

dateRangePicker.show(supportFragmentManager, dateRangePicker.toString())

3. Customizing the Date Picker:

The MaterialDatePicker.Builder class provides several methods to customize the appearance and behavior of the date picker:

setTitleText(): Sets the title text of the date picker dialog.
setSelection(): Sets the initial selection of the date picker.
setTheme(): Sets a custom theme for the date picker dialog.
setInputMode(): Sets the input mode, either text or calendar.
... and more.

4. Handle Configuration Changes:

To handle configuration changes, such as screen rotations, you need to check if the date picker is currently being displayed and then show it again. This can be achieved using the fragment manager:

if (supportFragmentManager.findFragmentByTag(datePicker.toString()) != null) {
    datePicker.show(supportFragmentManager, datePicker.toString())
}

In summary, the Material Design Date Picker provides a consistent and user-friendly way for users to select dates. It can be easily integrated into Android apps and customized to fit various use cases. Ensure you adhere to the Material Design guidelines when customizing the date picker to maintain a consistent user experience.

Android Material Design date picker example code:
- Use the MaterialDatePicker class to create a Material Design date picker. Set it up in your activity or fragment.
```
MaterialDatePicker<Long> datePicker = MaterialDatePicker.Builder.datePicker().build();
datePicker.show(getSupportFragmentManager(), datePicker.toString());
```

Creating a date picker with Material Components in Android:

Include the Material Components library in your build.gradle file and use the MaterialDatePicker class to create a date picker.

implementation 'com.google.android.material:material:1.5.0'

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

Customizing Material Design date picker appearance:

Customize the date picker appearance by using the MaterialDatePicker.Builder and setting attributes like setTitleText, setInputMode, and setTheme.

MaterialDatePicker<Long> datePicker = MaterialDatePicker.Builder.datePicker()
    .setTitleText("Select a Date")
    .setInputMode(MaterialDatePicker.INPUT_MODE_CALENDAR)
    .setTheme(R.style.CustomDatePickerTheme)
    .build();
datePicker.show(getSupportFragmentManager(), datePicker.toString());

Working with date range selection in Android Material Design:

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

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

Handling events and callbacks in Material Design date picker:
- Implement OnPositiveButtonClick or other listeners to handle events when the user selects a date or date range.
```
datePicker.addOnPositiveButtonClickListener(selection -> {
    // Handle date selection
});
```
MaterialDatePickerDialogFragment usage in Android:
- Use MaterialDatePickerDialogFragment for displaying the date picker as a dialog. This is useful for use cases where you want to show the date picker as part of a larger UI.
```
MaterialDatePickerDialogFragment dialogFragment = MaterialDatePicker.Builder.datePicker().build().newDatePickerDialogFragment();
dialogFragment.show(getSupportFragmentManager(), dialogFragment.toString());
```
Styling and theming Material Design date picker in Android:
- Apply styles and themes to the date picker to match your app's design. Customize the appearance by defining styles in your app's styles.xml file.
```
<style name="CustomDatePickerTheme" parent="ThemeOverlay.MaterialComponents.MaterialCalendar">
    
</style>
```

Material Design date picker XML layout examples in Android:

Define the date picker in your XML layout and customize its attributes.

<com.google.android.material.datepicker.MaterialDatePicker
    android:id="@+id/materialDatePicker"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:layout_constraintTop_toTopOf="parent"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintBottom_toBottomOf="parent" />