Authentic Motion
Tangible surfaces don’t just appear out of nowhere like a jump-cut in
a movie; they move into place helping to focus attention, establish
spatial relationships and maintain continuity. Materials respond to
touch to confirm your interaction and all changes radiate outward from
your touch point. All motion is meaningful and intimate, aiding the
user’s comprehension.
Activity + Fragment Transitions
By declaring ‘shared elements’ that are common across two screens you
can create a smooth transition between the two states.
album_grid.xml
…
<ImageView
…
android:transitionName="@string/transition_album_cover" />
album_details.xml
…
<ImageView
…
android:transitionName="@string/transition_album_cover" />
AlbumActivity.java
Intent intent = new Intent();
String transitionName = getString(R.string.transition_album_cover);
…
ActivityOptionsCompat options =
ActivityOptionsCompat.makeSceneTransitionAnimation(activity,
albumCoverImageView, // The view which starts the transition
transitionName // The transitionName of the view we’re transitioning to
);
ActivityCompat.startActivity(activity, intent, options.toBundle());
Here we define the same transitionName in two screens. When starting
the new Activity and this transition is animated automatically. In
addition to shared elements, you can now also choreograph entering and
exiting elements.
Source: Implementing Material Design