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. |