问题
Firstly, my status bar background is set to dark brown, and my navigation bar background is default black. I\'m using the Material light theme.
I\'m starting a new activity using ActivityOptions.makeSceneTransitionAnimation with default transitions, and I notice that both the status and navigation bars briefly fade to white and then back to the correct colors.
According to the documentation:
To get the full effect of a transition, you must enable window content transitions on both the calling and called activities. Otherwise, the calling activity will start the exit transition, but then you\'ll see a window transition (like scale or fade)
I am using getWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS); on both the calling and called activities.
Similarly, if I change the enter transition to a slide, both the status and navigation bars briefly have a slide transition with a white background.
How do I prevent the status bar and navigation bar from animating during an activity scene animation transition?
回答1:
There are two approaches you can use that I know of to prevent the navigation/status bar from animating during the transition:
Approach #1: Exclude the status bar and navigation bar from the window's default exit/enter fade transition
The reason why the navigation/status bar are fading in and out during the transition is because by default all non-shared views (including the navigation/status bar backgrounds) will fade out/in in your calling/called Activitys respectively once the transition begins. You can, however, easily get around this by excluding the navigation/status bar backgrounds from the window's default exit/enter Fade transition. Simply add the following code to your Activitys' onCreate() methods:
Transition fade = new Fade();
fade.excludeTarget(android.R.id.statusBarBackground, true);
fade.excludeTarget(android.R.id.navigationBarBackground, true);
getWindow().setExitTransition(fade);
getWindow().setEnterTransition(fade);
This transition could also be declared in the activity's theme using XML (i.e. in your own res/transition/window_fade.xml file):
<?xml version="1.0" encoding="utf-8"?>
<fade xmlns:android="http://schemas.android.com/apk/res/android">
<targets>
<target android:excludeId="@android:id/statusBarBackground"/>
<target android:excludeId="@android:id/navigationBarBackground"/>
</targets>
</fade>
Approach #2: Add the status bar and navigation bar as shared elements
This approach builds off of klmprt's answer, which almost worked for me... although I still needed to make a couple of modifications.
In my calling Activity, I used the following code to start the Activity:
View statusBar = findViewById(android.R.id.statusBarBackground);
View navigationBar = findViewById(android.R.id.navigationBarBackground);
List<Pair<View, String>> pairs = new ArrayList<>();
if (statusBar != null) {
pairs.add(Pair.create(statusBar, Window.STATUS_BAR_BACKGROUND_TRANSITION_NAME));
}
if (navigationBar != null) {
pairs.add(Pair.create(navigationBar, Window.NAVIGATION_BAR_BACKGROUND_TRANSITION_NAME));
}
pairs.add(Pair.create(mSharedElement, mSharedElement.getTransitionName()));
Bundle options = ActivityOptions.makeSceneTransitionAnimation(activity,
pairs.toArray(new Pair[pairs.size()])).toBundle();
startActivity(new Intent(context, NextActivity.class), options);
So far this is essentially the same thing that klmprt suggested in his answer. However, I also needed to add the following code in my called Activity's onCreate() method in order to prevent the status bar and navigation bar from "blinking" during the transition:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_next);
// Postpone the transition until the window's decor view has
// finished its layout.
postponeEnterTransition();
final View decor = getWindow().getDecorView();
decor.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
decor.getViewTreeObserver().removeOnPreDrawListener(this);
startPostponedEnterTransition();
return true;
}
});
}
Adding the status bar and navigation bar backgrounds as shared elements will force them to be drawn on top of the window's default exit/enter fade transition, meaning that they will not fade during the transition. More discussion about this approach can be found in this Google+ post.
回答2:
Completely prevent Activity transitions from interfering with shared element transitions:
On the exiting activity, call getWindow().setExitTransition(null);
On the entering activity, call getWindow().setEnterTransition(null);
From https://stackoverflow.com/a/34907685/967131
I suspect this may have side effects, but don't know for sure. It is dead simple and works though.
Prevent specific elements from blinking:
I started with Alex Lockwood's answer and did a fair bit of experimentation to try to get it working. The core of it is correct, although I didn't need the code he suggests for the receiving Activity, but I ran into some problems by calling it in a Fragment (instead of an Activity) and by setting a toolbar as the action bar.
Oh, the Fragment thing? I saw a lot of comments that trying to retrieve references to the status bar and navigation bar were null. The same thing happened to me as well, until I realized I wouldn't find those in the Fragment's layout... they were above that level. Hence, the code below to get the decor view from the Activity and search that. Then I found them with no problem.
In the end, I developed this utility method:
public static Bundle transitionOptions(Activity activity, int transitionViewResId, int transitionNameResId) {
if (VERSION.SDK_INT < VERSION_CODES.LOLLIPOP) {
return null;
}
View decorView = activity.getWindow().getDecorView();
View statusBar = decorView.findViewById(android.R.id.statusBarBackground);
View navigationBar = decorView.findViewById(android.R.id.navigationBarBackground);
View appBarLayout = decorView.findViewById(**R.id.appbarlayout**);
View transitionView = decorView.findViewById(transitionViewResId);
String transitionName = activity.getString(transitionNameResId);
List<Pair<View, String>> pairs = new ArrayList<>();
pairs.add(Pair.create(statusBar, Window.STATUS_BAR_BACKGROUND_TRANSITION_NAME));
pairs.add(Pair.create(navigationBar, Window.NAVIGATION_BAR_BACKGROUND_TRANSITION_NAME));
if (appBarLayout != null) {
pairs.add(Pair.create(appBarLayout, activity.getString(**R.string.transition_appbarlayout**)));
}
pairs.add(Pair.create(transitionView, transitionName));
//noinspection unchecked - we're not worried about the "unchecked" conversion of List<Pair> to Pair[] here
return ActivityOptionsCompat.makeSceneTransitionAnimation(activity, pairs.toArray(new Pair[pairs.size()]))
.toBundle();
}
Note R.string.transition_appbarlayout and R.id.appbarlayout. These IDs are arbitrary, as long as they match what your code uses. In my XML, I layout the custom action bar like so (edited down to the essentials):
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.AppBarLayout
android:id="**@+id/appbarlayout**"
android:transitionName="**@string/transition_appbarlayout**">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"/>
</android.support.design.widget.AppBarLayout>
If you don't use a Toolbar like this, that part can be removed from the utility method.
Then you would call it in your Fragment like so:
startActivity(intent, UIUtils.transitionOptions(getActivity(),
R.id.**my_view**,
R.string.**transition_my_view**));
Using whatever values you want, as long as it matches your XML.
This prevents the status bar, the tool bar and the navigation bar (back / home / recent apps buttons) from flashing during the transition. The rest of the Activity transition is normal.
In my case, our app theme has a android:windowBackground of blue. This causes a blue flash in the transition, which is quite frustrating. But rather than make a change that affects the entire app like that, for now I am going with the first, quick and dirty option.
回答3:
You need to share them in ActivityOptions.makeSceneTransitionAnimation.
E.g:
ActivityOptions.makeSceneTransitionAnimation(... Pair.create(activity.findViewById(android.R.id.window_status_bar), Window.STATUS_BAR_BACKGROUND_TRANSITION_NAME)
(excuse the psuedo; I don't have the exact android.R.id value on hand)
You can run an appropriate transition after having shared the views.
回答4:
As far as I understand this is caused by activity transition overlap. To overcome this issue I have used the following values in the onCreate() methods of both activities:
getWindow().setAllowEnterTransitionOverlap(false);
getWindow().setAllowReturnTransitionOverlap(false);
回答5:
I just had this same issue, and the answers appear to be missing a critical piece to the puzzle. Remember that on a shared element transition, everything happens in the Destination Activity.
In order to remove the flashing effect, simply add the following to the activity being called:
Fade fade = new Fade();
fade.excludeTarget(android.R.id.statusBarBackground, true);
fade.excludeTarget(android.R.id.navigationBarBackground, true);
getWindow().setEnterTransition(fade);
getWindow().setExitTransition(fade);
This should solve your problem!
回答6:
getWindow().setEnterTransition(null); on the Entering transition removed the white overlay for me.
回答7:
Here is how I did it. I share both the Status Bar and the Navigation Bar in the SharedElementTransition along with an ImageView :
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
View imageView = view.findViewById(R.id.iv);
Resources resources = view.getResources();
imageView.setTransitionName(resources.getString(R.string.transition_image_thumbnail));
Pair<View, String> p1 = Pair.create(imageView, resources.getString(R.string.transition_image_thumbnail));
Window window = getActivity().getWindow();
View navigationBar = getActivity().findViewById(android.R.id.navigationBarBackground);
View statusBar = getActivity().findViewById(android.R.id.statusBarBackground);
Pair<View, String> p2 = Pair.create(statusBar, statusBar.getTransitionName());
Pair<View, String> p3 = Pair.create(navigationBar, navigationBar.getTransitionName());
ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(getActivity(),
p1, p2, p3);
ActivityCompat.startActivity(getActivity(), intent, options.toBundle());
} else {
startActivity(intent);
}
来源：https://stackoverflow.com/questions/26600263/how-do-i-prevent-the-status-bar-and-navigation-bar-from-animating-during-an-acti