Fadepublic class Fade extends Visibility | This transition tracks changes to the visibility of target views in the
start and end scenes and fades views in or out when they become visible
or non-visible. Visibility is determined by both the
{@link View#setVisibility(int)} state of the view as well as whether it
is parented in the current view hierarchy.
The ability of this transition to fade out a particular view, and the
way that that fading operation takes place, is based on
the situation of the view in the view hierarchy. For example, if a view was
simply removed from its parent, then the view will be added into a {@link
android.view.ViewGroupOverlay} while fading. If a visible view is
changed to be {@link View#GONE} or {@link View#INVISIBLE}, then the
visibility will be changed to {@link View#VISIBLE} for the duration of
the animation. However, if a view is in a hierarchy which is also altering
its visibility, the situation can be more complicated. In general, if a
view that is no longer in the hierarchy in the end scene still has a
parent (so its parent hierarchy was removed, but it was not removed from
its parent), then it will be left alone to avoid side-effects from
improperly removing it from its parent. The only exception to this is if
the previous {@link Scene} was
{@link Scene#getSceneForLayout(android.view.ViewGroup, int, android.content.Context)
created from a layout resource file}, then it is considered safe to un-parent
the starting scene view in order to fade it out.
A Fade transition can be described in a resource file by using the
tag fade, along with the standard
attributes of {@link android.R.styleable#Fade} and
{@link android.R.styleable#Transition}. |
| Fields Summary |
|---|
| private static boolean | DBG | | private static final String | LOG_TAG | | public static final int | INFading mode used in {@link #Fade(int)} to make the transition
operate on targets that are appearing. Maybe be combined with
{@link #OUT} to fade both in and out. Equivalent to
{@link Visibility#MODE_IN}. | | public static final int | OUTFading mode used in {@link #Fade(int)} to make the transition
operate on targets that are disappearing. Maybe be combined with
{@link #IN} to fade both in and out. Equivalent to
{@link Visibility#MODE_OUT}. |
| Constructors Summary |
|---|
public Fade()Constructs a Fade transition that will fade targets in and out.
| public Fade(int fadingMode)Constructs a Fade transition that will fade targets in
and/or out, according to the value of fadingMode.
setMode(fadingMode);
| public Fade(android.content.Context context, android.util.AttributeSet attrs)
super(context, attrs);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.Fade);
int fadingMode = a.getInt(R.styleable.Fade_fadingMode, getMode());
setMode(fadingMode);
|
| Methods Summary |
|---|
| private android.animation.Animator | createAnimation(android.view.View view, float startAlpha, float endAlpha)Utility method to handle creating and running the Animator.
if (startAlpha == endAlpha) {
return null;
}
view.setTransitionAlpha(startAlpha);
final ObjectAnimator anim = ObjectAnimator.ofFloat(view, "transitionAlpha", endAlpha);
if (DBG) {
Log.d(LOG_TAG, "Created animator " + anim);
}
FadeAnimatorListener listener = new FadeAnimatorListener(view);
anim.addListener(listener);
anim.addPauseListener(listener);
return anim;
| | public android.animation.Animator | onAppear(android.view.ViewGroup sceneRoot, android.view.View view, TransitionValues startValues, TransitionValues endValues)
if (DBG) {
View startView = (startValues != null) ? startValues.view : null;
Log.d(LOG_TAG, "Fade.onAppear: startView, startVis, endView, endVis = " +
startView + ", " + view);
}
return createAnimation(view, 0, 1);
| | public android.animation.Animator | onDisappear(android.view.ViewGroup sceneRoot, android.view.View view, TransitionValues startValues, TransitionValues endValues)
return createAnimation(view, 1, 0);
|
|
