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Material Animations Show me the code! @lgvalle lgvalle.xyz

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Why animate?

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Animations teach what is happening · what can i do

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Where things go? What can I do? Where am I? Where things come from?

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https://medium.com/@BashaChris/overhauling-the-twitter-experience-on-android-80f5b09e7c67 Overhauling the Twitter Experience on Android Where things come Where things go? Where am I? What can I do?

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Where things come Where things go? Where am I? What can I do?

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Where things come Where things go? Where am I? What can I do?

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Where things come Where things go? Where am I? What can I do?

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Where things come Where things go? Where am I? What can I do?

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What can be animated? Layout content Shared elements View Properties x

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Property Animation System
 (API 11) View property changes Transition Framework
 (API 19) View property changes Layout changes ViewAnimationUtils
 (API 21) CircularReveal Activity Transitions Fragment Transitions

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Animate screen transitions exit · enter · shared startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back()

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startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back() Cross-fade by default Reversed enter/exit by default

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startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back() But you can customise! Cross-fade by default Reversed enter/exit by default

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Explode Slide Fade Transition custom effects

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> activities/MainActivity.java @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Explode explode = new Explode();
 getWindow().setExitTransition(explode); }
 Exit Transition @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_details);
 }
 > activities/DetailsActivity.java

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startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back() A B B A Enter and Exit animations 
 overlap each other Transition Overlap

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startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back() A B B A Enter and Exit animations 
 overlap each other Transition Overlap

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protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Explode explode = new Explode();
 getWindow().setExitTransition(explode); }
 Disable overlap @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_details); 
 getWindow().setAllowEnterTransitionOverlap(false);
 } 
 > activities/DetailsActivity.java

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> activities/MainActivity.java @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Explode explode = new Explode(); explode.excludeTarget(R.id.toolbar, true);
 getWindow().setExitTransition(explode); }
 Exclude Views @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout. getWindow().setAllowEnterTransitionOverlap(false); } 
 > activities/

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protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 Explode explode = new Explode(); explode.excludeTarget(R.id.toolbar, true); getWindow().setExitTransition(explode); }
 Return Transition @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_details); getWindow().setAllowEnterTransitionOverlap(false); Slide slide = new Slide(Gravity.RIGHT);
 getWindow().setReturnTransition(slide);
 } 
 > activities/DetailsActivity.java

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Shared Element Transition startActivity(B) A Exit Enter A B B … B Return Reenter B A A … back() Shared Element Shared Element 
 has its own transitions

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res/values/styles.xml <item name=“android:windowContentTransitions”>true</item> … 1. Enable content transition activities/MainActivity.java @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState); getWindow().requestFeature(Window.FEATURE_CONTENT_TRANSITIONS);
 … }
 -OR-

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 2. Common Transition Name

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> activities/MainActivity.java Intent i = new Intent(this, DetailsActivity.class);
 
 ActivityOptions options = ActivityOptions .makeSceneTransitionAnimation( this, rowView, // shared element view "rowName"); // common transition name 
 startActivity(i, options.toBundle());
 @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout. getWindow().setAllowEnterTransitionOverlap(false); } 
 > activities/ 3. Start Activity (with options)

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> activities/DetailsActivity.java Transition fade = getWindow().getEnterTransition();
 fade.addListener(new TransitionListener() {
 @Override
 public void onTransitionEnd(Transition t) {
 fab.setVisibility(View.VISIBLE); fade.removeListener(this);
 } …
 }); Transition listener

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> activities/DetailsActivity.java Transition fade = getWindow().getEnterTransition();
 fade.addListener(new TransitionListener() {
 @Override
 public void onTransitionEnd(Transition t) {
 fab.setVisibility(View.VISIBLE); fade.removeListener(this);
 } …
 }); Transition listener Don’t forget!

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> activities/DetailsActivity.java Transition fade = getWindow().getEnterTransition();
 fade.addListener(new TransitionListener() {
 @Override
 public void onTransitionEnd(Transition t) {
 fab.setVisibility(View.VISIBLE); fade.removeListener(this); } …
 }); Transition listener @Override
 public void onBackPressed() {
 fab.setVisibility(View.INVISIBLE);
 finishAfterTransition(); }

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Animate screen elements property changes · circular reveal

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> activities/DetailsActivity.java Transition fade = getWindow().getEnterTransition();
 fade.addListener(new TransitionListener() {
 @Override
 public void onTransitionEnd(Transition t) {
 fab.animate().scaleX(1f).scaleY(1f) fade.removeListener(this); } …
 }); Transition listener @Override
 public void onBackPressed() {
 fab.animate().scaleX(0f).scaleY(0f)
 .withEndAction(new Runnable() {
 @Override
 public void run() {
 finishAfterTransition();
 }
 }); }

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> activities/DetailsActivity.java Transition fade = getWindow().getEnterTransition();
 fade.addListener(new TransitionListener() {
 @Override
 public void onTransitionEnd(Transition t) {
 fab.animate().scaleX(1f).scaleY(1f) fade.removeListener(this); } …
 }); Transition listener @Override
 public void onBackPressed() {
 fab.animate().scaleX(0f).scaleY(0f)
 .withEndAction(new Runnable() {
 @Override
 public void run() {
 finishAfterTransition();
 }
 }); } Property Animation System
 (API 11+)

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What about complex animations?

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TransitionManager.beginDelayedTransition StartTransition

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StartTransition Save Start State TransitionManager.beginDelayedTransition

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StartTransition Capture end state Save Start State TransitionManager.beginDelayedTransition

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StartTransition Capture end state Animate difference Save Start State TransitionManager.beginDelayedTransition

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public void onClickFab() { int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams) } FAB Transition

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams); FAB Transition Inflate transition from XML!

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 > res/transitions/changebounds_with_arcmotion.xml

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT); 
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams); FAB Transition

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams); FAB Transition

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams); FAB Transition

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); 
 TransitionManager.beginDelayedTransition(viewRoot, transition);
 RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
 layoutParams.addRule(RelativeLayout.CENTER_HORIZONTAL);
 layoutParams.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
 fab.setLayoutParams(layoutParams); FAB Transition Where is the Circular Reveal?!

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Circular Reveal Title A Title A Title A Title B Bacon ipsum dolor amet sausage bacon pork chop strip steak cow porchetta landjaeger ham sirloin swine leberkas prosciutto turducken ball tip. Pork chop kielbasa shank cow, pig corned beef hamburger

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Circular Reveal (x,y) x = (left + right) / 2
 y = (top + bottom) / 2 
 startRadius = 0
 endRadius = max(width, height)
 createCircularReveal(view, x, y, startRadius, endRadius) left right top bottom

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int x = (view.getLeft() + view.getRight()) / 2;
 int y = (view.getTop() + view.getBottom()) / 2;
 int startRadius = 0; int endRadius = Math.max(view.getWidth(), view.getHeight()); 
 Animator anim = ViewAnimationUtils .createCircularReveal(view, x, y, startRadius, endRadius); view.setVisibility(View.VISIBLE); anim.start(); Circular Reveal (x,y) left right top bottom

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int transitionId = R.transition.changebounds_with_arcmotion;
 TransitionInflater inflater = TransitionInflater.from(this); Transition transition = inflater.inflateTransition(transitionId); transition.addListener(new Transition.TransitionListener() {
 @Override
 public void onTransitionEnd(Transition transition) {
 fab.setVisibility(View.GONE);
 createRevealForView(extraContent);
 }
 });
 (…) private Animator createRevealForView(ViewGroup view) {
 int x = (view.getLeft() + view.getRight()) / 2;
 int y = view.getBottom();
 float finalRadius = (float) Math.max(view.getWidth(), view.getHeight());
 
 Animator anim = ViewAnimationUtils.createCircularReveal(view, x, y, 0, finalRadius);
 viewRoot.setVisibility(View.VISIBLE);
 anim.start();
 } Circular Reveal

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-Shared element Transition -Transition Listener -Enter / Exit Transition -Property Animation System -Delayed Transitions -Circular Reveal

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Pasquale D’Silva: Designing with animation
 https://youtu.be/TMe0WnkF1Lc Material Animations: Code Samples
 https://github.com/lgvalle/Material-Animations Alex Lockwood: Transition Framework
 http://goo.gl/y4ZSsp Saul Molinero: User interface 
 http://goo.gl/8gex9n Material Witness: How Android material applications work
 https://youtu.be/97SWYiRtF0Y Chris Basha: Overhauling the Twitter Experience on Android
 https://goo.gl/F281b2 Resources

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Questions? @lgvalle lgvalle.xyz