The text is updated when the Dialog launches and on user clicks.
*
* @param selection The current user selection
*/
protected abstract String getHeaderText(@Nullable S selection);
/** Returns an {@link @AttrRes} to apply as a theme overlay to the DialogFragment */
protected abstract int getDefaultThemeAttr();
/**
* Creates the {@link GridSelector} used for the {@link MaterialCalendar} in this {@link
* DialogFragment}.
*/
protected abstract GridSelector createGridSelector();
private SimpleDateFormat userDefinedSimpleDateFormat;
@StyleRes private int themeResId;
private GridSelector gridSelector;
private PickerFragment pickerFragment;
private CalendarBounds calendarBounds;
@StringRes private int titleTextResId;
private boolean fullscreen;
private TextView headerSelectionText;
private CheckableImageButton headerToggleButton;
private MaterialShapeDrawable fullscreenBackground;
/**
* Adds the super class required arguments to the Bundle.
*
*
Call this method in subclasses before the initial call to {@link * DialogFragment#setArguments(Bundle)} * * @param args The Bundle from the subclassing DialogFragment * @param themeResId 0 or a {@link StyleRes} representing a ThemeOverlay */ protected static void addArgsToBundle( Bundle args, int themeResId, CalendarBounds calendarBounds, @StringRes int overlineTextResId) { args.putInt(THEME_RES_ID_KEY, themeResId); args.putParcelable(CALENDAR_BOUNDS_KEY, calendarBounds); args.putInt(TITLE_TEXT_RES_ID_KEY, overlineTextResId); } @StyleRes private static int getThemeResource(Context context, int defaultThemeAttr, int themeResId) { if (themeResId != 0) { return themeResId; } return MaterialAttributes.resolveOrThrow( context, defaultThemeAttr, MaterialPickerDialogFragment.class.getCanonicalName()); } @Override public final void onSaveInstanceState(Bundle bundle) { super.onSaveInstanceState(bundle); bundle.putInt(THEME_RES_ID_KEY, themeResId); bundle.putParcelable(GRID_SELECTOR_KEY, gridSelector); bundle.putParcelable(CALENDAR_BOUNDS_KEY, calendarBounds); bundle.putInt(TITLE_TEXT_RES_ID_KEY, titleTextResId); } @Override public final void onCreate(@Nullable Bundle bundle) { super.onCreate(bundle); Bundle activeBundle = bundle == null ? getArguments() : bundle; themeResId = getThemeResource( getContext(), getDefaultThemeAttr(), activeBundle.getInt(THEME_RES_ID_KEY)); gridSelector = activeBundle.getParcelable(GRID_SELECTOR_KEY); calendarBounds = activeBundle.getParcelable(CALENDAR_BOUNDS_KEY); titleTextResId = activeBundle.getInt(TITLE_TEXT_RES_ID_KEY); if (gridSelector == null) { gridSelector = createGridSelector(); } } @Override public final Dialog onCreateDialog(@Nullable Bundle bundle) { Dialog dialog = new Dialog(requireContext(), themeResId); Context context = dialog.getContext(); fullscreen = isFullscreen(context); int surfaceColor = MaterialAttributes.resolveOrThrow( getContext(), R.attr.colorSurface, MaterialPickerDialogFragment.class.getCanonicalName()); fullscreenBackground = new MaterialShapeDrawable(); fullscreenBackground.setFillColor(ColorStateList.valueOf(surfaceColor)); return dialog; } @NonNull @Override public final View onCreateView( @NonNull LayoutInflater layoutInflater, @Nullable ViewGroup viewGroup, @Nullable Bundle bundle) { int layout = fullscreen ? R.layout.mtrl_picker_fullscreen : R.layout.mtrl_picker_dialog; View root = layoutInflater.inflate(layout, viewGroup); Context context = root.getContext(); View frame = root.findViewById(R.id.mtrl_calendar_frame); frame.setLayoutParams( new LayoutParams(getPaddedPickerWidth(context), LayoutParams.WRAP_CONTENT)); headerSelectionText = root.findViewById(R.id.mtrl_picker_header_selection_text); headerToggleButton = root.findViewById(R.id.mtrl_picker_header_toggle); ((TextView) root.findViewById(R.id.mtrl_picker_title_text)).setText(titleTextResId); initHeaderToggle(context); MaterialButton confirmButton = root.findViewById(R.id.confirm_button); confirmButton.setTag(CONFIRM_BUTTON_TAG); confirmButton.setOnClickListener(v -> dismiss()); MaterialButton cancelButton = root.findViewById(R.id.cancel_button); cancelButton.setTag(CANCEL_BUTTON_TAG); cancelButton.setOnClickListener(v -> dismiss()); return root; } @Override public void onStart() { super.onStart(); Window window = getDialog().getWindow(); // Dialogs use a background with an InsetDrawable by default, so we have to replace it. if (fullscreen) { window.setLayout(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT); window.setBackgroundDrawable(fullscreenBackground); } else { window.setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT); int inset = getResources().getDimensionPixelOffset(R.dimen.mtrl_calendar_dialog_background_inset); window.setBackgroundDrawable(new InsetDrawable(fullscreenBackground, inset)); Rect insets = new Rect(inset, inset, inset, inset); window .getDecorView() .setOnTouchListener(new InsetDialogOnTouchListener(requireDialog(), insets)); } startPickerFragment(); } @Override public void onStop() { pickerFragment.getGridSelector().clearOnSelectionChangedListeners(); super.onStop(); } @Override public final void onDismiss(@NonNull DialogInterface dialogInterface) { ViewGroup viewGroup = ((ViewGroup) getView()); if (viewGroup != null) { viewGroup.removeAllViews(); } super.onDismiss(dialogInterface); } /** * Returns a {@link S} instance representing the selection or null if the user has not confirmed a * selection. */ @Nullable public final S getSelection() { return gridSelector.getSelection(); } /** * Sets a user-defined date formatter. * *
Useful when the default localized date format is inadequate */ public final void setSimpleDateFormat(@Nullable SimpleDateFormat simpleDateFormat) { userDefinedSimpleDateFormat = simpleDateFormat; } /** Returns the user-defined date formatter. */ @Nullable public final SimpleDateFormat getSimpleDateFormat() { return userDefinedSimpleDateFormat; } private void updateHeader(S selection) { headerSelectionText.setText(getHeaderText(selection)); } private void startPickerFragment() { pickerFragment = headerToggleButton.isChecked() ? MaterialTextInputPicker.newInstance(gridSelector, calendarBounds) : MaterialCalendar.newInstance(gridSelector, themeResId, calendarBounds); updateHeader(gridSelector.getSelection()); FragmentTransaction fragmentTransaction = getChildFragmentManager().beginTransaction(); fragmentTransaction.replace(R.id.mtrl_calendar_frame, pickerFragment); fragmentTransaction.commitNow(); pickerFragment.getGridSelector().addOnSelectionChangedListener(this::updateHeader); } private void initHeaderToggle(Context context) { headerToggleButton.setTag(TOGGLE_BUTTON_TAG); headerToggleButton.setImageDrawable(createHeaderToggleDrawable(context)); headerToggleButton.setOnClickListener( v -> { headerToggleButton.toggle(); startPickerFragment(); }); } // Create StateListDrawable programmatically for pre-lollipop support private static Drawable createHeaderToggleDrawable(Context context) { StateListDrawable toggleDrawable = new StateListDrawable(); toggleDrawable.addState( new int[] {android.R.attr.state_checked}, AppCompatResources.getDrawable(context, R.drawable.ic_calendar_black_24dp)); toggleDrawable.addState( new int[] {}, AppCompatResources.getDrawable(context, R.drawable.ic_edit_black_24dp)); return toggleDrawable; } static boolean isFullscreen(Context context) { int calendarStyle = MaterialAttributes.resolveOrThrow( context, R.attr.materialCalendarStyle, MaterialCalendar.class.getCanonicalName()); int[] attrs = {android.R.attr.windowFullscreen}; TypedArray a = context.obtainStyledAttributes(calendarStyle, attrs); boolean fullscreen = a.getBoolean(0, false); a.recycle(); return fullscreen; } private static int getPaddedPickerWidth(Context context) { Resources resources = context.getResources(); int padding = resources.getDimensionPixelOffset(R.dimen.mtrl_calendar_content_padding); int daysInWeek = Month.today().daysInWeek; int dayWidth = resources.getDimensionPixelSize(R.dimen.mtrl_calendar_day_width); int horizontalSpace = resources.getDimensionPixelOffset(R.dimen.mtrl_calendar_month_horizontal_padding); return 2 * padding + daysInWeek * dayWidth + (daysInWeek - 1) * horizontalSpace; } }