Google は、黒人コミュニティに対する人種平等の促進に取り組んでいます。取り組みを見る

ExpandableWidget

public interface ExpandableWidget

com.google.android.material.expandable.ExpandableWidget


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.