Summary: Methods

ExpandableWidget

public interface ExpandableWidget

com.google.android.material.expandable.ExpandableWidget

Known indirect subclasses ExpandableTransformationWidget, FloatingActionButton ExpandableTransformationWidget An ExpandableWidget that visually transforms into another component when expanded.  FloatingActionButton Floating action buttons are used for a special type of promoted action.

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A widget that has expanded/collapsed state. When the expanded state changes, an event is dispatched so that other widgets may react via a CoordinatorLayout.Behavior.

Implementations of this interface should create an instance of ExpandableWidgetHelper and forward all calls to it.

The expanded state can saved across configuration changes by implementing View.onSaveInstanceState() and View.onRestoreInstanceState(Parcelable):

 @Override
 protected Parcelable onSaveInstanceState() {
   Parcelable superState = super.onSaveInstanceState();
   ExtendableSavedState state = new ExtendableSavedState(superState);

   state.extendableStates.put(
       "expandableWidgetHelper", expandableWidgetHelper.onSaveInstanceState());

   return state;
 }

 @Override
 protected void onRestoreInstanceState(Parcelable state) {
   if (!(state instanceof ExtendableSavedState)) {
     super.onRestoreInstanceState(state);
     return;
   }

   ExtendableSavedState ess = (ExtendableSavedState) state;
   super.onRestoreInstanceState(ess.getSuperState());

   expandableWidgetHelper.onRestoreInstanceState(
       ess.extendableStates.get("expandableWidgetHelper"));
 }
 

Summary

Public methods
abstract boolean	isExpanded() Returns whether this widget is expanded.
abstract boolean	setExpanded(boolean expanded) Sets the expanded state on this widget.

Public methods

isExpanded

public abstract boolean isExpanded ()

Returns whether this widget is expanded.

Implementations should call ExpandableWidgetHelper.isExpanded().

Returns
boolean

setExpanded

public abstract boolean setExpanded (boolean expanded)

Sets the expanded state on this widget.

Implementations should call ExpandableWidgetHelper.setExpanded(boolean).

Parameters
expanded	boolean

Returns
boolean	true if the expanded state changed as a result of this call.