Add some better transitions/animations

Change-Id: I98c1a7b46b312738d8fc9d8ab1e5d5a14d1f7bce

Author: samtstern

auth/build.gradle

@@ -53,7 +53,6 @@ dependencies {
     testCompile 'junit:junit:4.12'
     testCompile 'org.mockito:mockito-core:2.2.28'
     testCompile 'org.robolectric:robolectric:3.1.4'
-    testCompile "org.robolectric:shadows-support-v4:3.1.4"
     // See https://github.com/robolectric/robolectric/issues/1932#issuecomment-219796474
     testCompile 'org.khronos:opengl-api:gl1.1-android-2.1_r1'
 }

auth/src/main/java/com/firebase/ui/auth/ui/email/RegisterEmailActivity.java

@@ -34,8 +34,8 @@
  * Activity to control the entire email sign up flow. Plays host to {@link CheckEmailFragment}
  * and {@link RegisterEmailFragment} and triggers {@link WelcomeBackPasswordPrompt}.
  */
-public class RegisterEmailActivity extends AppCompatBase
-        implements CheckEmailFragment.CheckEmailListener {
+public class RegisterEmailActivity extends AppCompatBase implements
+        CheckEmailFragment.CheckEmailListener {
 
     private static final int RC_SIGN_IN = 17;
     private static final int RC_WELCOME_BACK_IDP = 18;
@@ -76,6 +76,8 @@ public void onExistingEmailUser(@NonNull String email) {
                         mActivityHelper.getFlowParams(),
                         new IdpResponse(EmailAuthProvider.PROVIDER_ID, email)),
                 RC_SIGN_IN);
+
+        setSlideAnimation();
     }
 
     @Override
@@ -89,6 +91,8 @@ public void onExistingIdpUser(@NonNull String email, @NonNull String provider) {
                 email);
         mActivityHelper.startActivityForResult(intent,
                 RC_WELCOME_BACK_IDP);
+
+        setSlideAnimation();
     }
 
     @Override
@@ -100,10 +104,16 @@ public void onNewUser(@NonNull String email, @Nullable String name) {
                 name);
         getSupportFragmentManager().beginTransaction()
                 .replace(R.id.fragment_register_email, fragment, RegisterEmailFragment.TAG)
+                .addSharedElement(findViewById(R.id.email_layout), "email_field")
                 .disallowAddToBackStack()
                 .commit();
     }
 
+    private void setSlideAnimation() {
+        // Make the next activity slide in
+        overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left);
+    }
+
     public static Intent createIntent(Context context, FlowParameters flowParams) {
         return createIntent(context, flowParams, null);
     }

auth/src/main/java/com/firebase/ui/auth/ui/email/RegisterEmailFragment.java

@@ -123,7 +123,6 @@ public View onCreateView(LayoutInflater inflater,
     @Override
     public void onActivityCreated(@Nullable Bundle savedInstanceState) {
         super.onActivityCreated(savedInstanceState);
-
         // Set title
         if (getActivity().getActionBar() != null) {
             getActivity().getActionBar().setTitle(R.string.title_register_email_activity);

auth/src/main/res/anim/slide_in_right.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate
+        android:duration="@android:integer/config_mediumAnimTime"
+        android:fromXDelta="100%p"
+        android:toXDelta="0%p" />
+    <!--<alpha-->
+        <!--android:duration="@android:integer/config_mediumAnimTime"-->
+        <!--android:fromAlpha="0.0"-->
+        <!--android:toAlpha="1.0" />-->
+</set>

auth/src/main/res/anim/slide_out_left.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<set xmlns:android="http://schemas.android.com/apk/res/android">
+    <translate
+        android:duration="@android:integer/config_mediumAnimTime"
+        android:fromXDelta="0%p"
+        android:toXDelta="-100%p" />
+    <!--<alpha-->
+        <!--android:duration="@android:integer/config_mediumAnimTime"-->
+        <!--android:fromAlpha="1.0"-->
+        <!--android:toAlpha="0.0" />-->
+</set>

auth/src/main/res/layout/check_email_layout.xml

@@ -11,6 +11,8 @@
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:paddingTop="16dp"
+        android:transitionGroup="true"
+        android:transitionName="email_field"
         app:errorTextAppearance="@style/FirebaseUI.Text.ErrorText"
         app:hintTextAppearance="@style/FirebaseUI.Text.HintText">
 

auth/src/main/res/layout/register_email_layout.xml

@@ -19,6 +19,8 @@
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
             android:paddingTop="16dp"
+            android:transitionGroup="true"
+            android:transitionName="email_field"
             app:errorTextAppearance="@style/FirebaseUI.Text.ErrorText"
             app:hintTextAppearance="@style/FirebaseUI.Text.HintText">