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Download

Go to the Releases to download the demo APK.

Screenshots

Morphing Animation for Jetpack Compose

If you want to implement morphing animation in Jetpack Compose, check out Orbital.

Including in your project

Gradle

Add the dependency below to your module's build.gradle file:

dependencies {
    implementation("com.github.skydoves:transformationlayout:1.1.4")
}

Usage

Add the XML namespace below inside your XML layout file:

xmlns:app="http://schemas.android.com/apk/res-auto"

TransformationLayout

TransformationLayout is an essential concept to transform your Views, Activities, and Fragments into other components. You must wrap one or more Views that are supposed to be transformed using TransformationLayout like the example code below:

<com.skydoves.transformationlayout.TransformationLayout
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  app:transformation_targetView="@+id/my_cardView" // sets a target view.
  app:transformation_duration="450" // sets a duration of the transformation.
  app:transformation_direction="auto" // auto, entering, returning
  app:transformation_fadeMode="in" // in, out, cross, through
  app:transformation_fitMode="auto" // auto, height, width
  app:transformation_pathMode="arc" // arc, linear
>

   <!-- other complicated views -->

</com.skydoves.transformationlayout.TransformationLayout>

Transform into a view

For instance, you can transform a floating button into a CardView as you've seen in the example below:

<com.skydoves.transformationlayout.TransformationLayout
    android:id="@+id/transformationLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:transformation_duration="550"
    app:transformation_targetView="@+id/myCardView">

  <com.google.android.material.floatingactionbutton.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:backgroundTint="@color/colorPrimary"
      android:src="@drawable/ic_write"/>
</com.skydoves.transformationlayout.TransformationLayout>

<com.google.android.material.card.MaterialCardView
    android:id="@+id/myCardView"
    android:layout_width="240dp"
    android:layout_height="312dp"
    android:layout_marginLeft="30dp"
    android:layout_marginTop="30dp"
    app:cardBackgroundColor="@color/colorPrimary" />

Bind a TargetView

With the attribute below in your XML file, you can bind a targetView that should be transformed from the TransformationLayout. If you bind a targetView with a TransformationLayout, the targetView's visibility will be GONE by default.

app:transformation_targetView="@+id/myCardView"

You can also bind a targetView with a TransformationLayout using bindTargetView method like the code below:

transformationLayout.bindTargetView(myCardView)

Starting and finishing the transformation

After binding a targetView, we can start or finish transformation using the below methods.<br>

// start transformation when touching the fab.
fab.setOnClickListener {
  transformationLayout.startTransform()
}

// finish transformation when touching the myCardView.
myCardView.setOnClickListener {
  transformationLayout.finishTransform()
}

Here are other functionalities to starting and finishing transformation.

// starts and finishes transformation 1000 milliseconds later.
// If we use this method on onCreate() method, it will starts transformation automatically 200ms later.
transformationLayout.startTransformWithDelay(200)
transformationLayout.finishTransformWithDelay(200)

// starts and finishes transformation with stopping a parent layout.
transformationLayout.startTransform(parent)
transformationLayout.finishTransform(parent)

OnTransformFinishListener

We can listen a TransformationLayout is transformed or not using OnTransformFinishListener. <br>

transformationLayout.setOnTransformFinishListener {
  Toast.makeText(context, "is transformed: $it", Toast.LENGTH_SHORT).show()
}

Here is the Java way.

transformationLayout.onTransformFinishListener = new OnTransformFinishListener() {
  @Override public void onFinish(boolean isTransformed) {
    Toast.makeText(context, "is transformed:" + isTransformed, Toast.LENGTH_SHORT).show();
  }
};

Transform into an Activity

We can implement transformation between activities easily using TransformationActivity and TransformationCompat.

Here is an example of transforming a floating action button to Activity. <br> We don't need to bind a targetView.

<com.skydoves.transformationlayout.TransformationLayout
    android:id="@+id/transformationLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:transformation_duration="550">

  <com.google.android.material.floatingactionbutton.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:backgroundTint="@color/colorPrimary"
      android:src="@drawable/ic_write"/>
</com.skydoves.transformationlayout.TransformationLayout>

onTransformationStartContainer

We should add onTransformationStartContainer() to the Activity that has the floating action button. If your view is in the fragment, the code should be added to the fragment's Activity. It must be called before super.onCreate.

override fun onCreate(savedInstanceState: Bundle?) {
    onTransformationStartContainer() // should be called before super.onCreate().
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

Here is the Java way.

TransformationCompat.onTransformationStartContainer(this);

TransformationAppCompatActivity

Extends TransformationAppCompatActivity or TransformationActivity to your activity that will be transformed.

class DetailActivity : TransformationAppCompatActivity()

Here is the Java way.

public class DetailActivity extends TransformationAppCompatActivity 

TransformationCompat

And start the DetailActivity using the TransformationCompat.startActivity method.

val intent = Intent(context, DetailActivity::class.java)
TransformationCompat.startActivity(transformationLayout, intent)

Here is the Java way.

Intent intent = new Intent(context, DetailActivity.class);
TransformationCompat.startActivity(transformationLayout, intent);

Manually Transform into an Activity

Here is an example of transforming a floating action button to Activity. <br> We don't need to bind a targetView.

<com.skydoves.transformationlayout.TransformationLayout
    android:id="@+id/transformationLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:transformation_duration="550">

  <com.google.android.material.floatingactionbutton.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:backgroundTint="@color/colorPrimary"
      android:src="@drawable/ic_write"/>
</com.skydoves.transformationlayout.TransformationLayout>

onTransformationStartContainer

We should add onTransformationStartContainer() to the Activity that has the floating action button. If your view is in the fragment, the code should be added to the fragment's Activity. It must be called before super.onCreate.

override fun onCreate(savedInstanceState: Bundle?) {
    onTransformationStartContainer() // should be called before super.onCreate().
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

Here is the Java way.

TransformationCompat.onTransformationStartContainer(this);

startActivity

And we should call startActivity with bundle and intent data.<br> We should get a bundle using withActivity method. It needs a context and any name of transition. <br> The bundle must be used as startActivity's parameter.<br> We should put parcelable data to the intent using getParcelableParams() method.<br> The extra name of the parcelable data can be anything, and it will be reused later.

fab.setOnClickListener {
    val bundle = transformationLayout.withActivity(this, "myTransitionName")
    val intent = Intent(this, DetailActivity::class.java)
    intent.putExtra("TransformationParams", transformationLayout.getParcelableParams())
    startActivity(intent, bundle)
}

If we want to get bundle data in RecyclerView or other classes, <br> we can use withView and withContext instead of withActivty.

// usage in the RecyclerView.Adapter
override fun onBindViewHolder(holder: PosterViewHolder, position: Int) {
   val bundle = transformationLayout.withView(holder.itemView, "myTransitionName")
}

Here is the Java way.

Bundle bundle = transformationLayout.withActivity(this, "myTransitionName");
Intent intent = new Intent(this, DetailActivity.class);
intent.putExtra("TransformationParams", transformationLayout.getParcelableParams());
startActivity(intent, bundle);

onTransformationEndContainer

And finally, we should add onTransformationEndContainer() to the Activity that will be started. <br> It must be added before super.onCreate.

override fun onCreate(savedInstanceState: Bundle?) {
    onTransformationEndContainer(intent.getParcelableExtra("TransformationParams"))
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_detail)
}

Here is the Java way.

TransformationLayout.Params params = getIntent().getParcelableExtra("TransformationParams");
TransformationCompat.onTransformationEndContainer(this, params);

Transform into a Fragment

We can implement transformation between fragments for a single Activity application.<br> Here is an example of transforming a floating action button in Fragment A to Fragment B.

<com.skydoves.transformationlayout.TransformationLayout
    android:id="@+id/transformationLayout"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    app:transformation_duration="550">

  <com.google.android.material.floatingactionbutton.FloatingActionButton
      android:id="@+id/fab"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:backgroundTint="@color/colorPrimary"
      android:src="@drawable/ic_write"/>
</com.skydoves.transformationlayout.TransformationLayout>

onTransformationStartContainer

We should call onTransformationStartContainer() in the Fragment A that has the floating action button.

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)
  onTransformationStartContainer()
}

Here is the Java way.

TransformationCompat.onTransformationStartContainer(this);

getBundle and addTransformation

We should get a bundle from the TransformationLayout and put it into the argument.<br> And in the fragment manager's transaction, we should add the TransformationLayout using addTransformation method.

val fragment = MainSingleDetailFragment()
val bundle = transformationLayout.getBundle("TransformationParams")
bundle.putParcelable(MainSingleDetailFragment.posterKey, poster)
fragment.arguments = bundle

requireFragmentManager()
  .beginTransaction()
  .addTransformation(transformationLayout)
  .replace(R.id.main_container, fragment, MainSingleDetailFragment.TAG)
  .addToBackStack(MainSingleDetailFragment.TAG)
  .commit()
}

Here is the Java way

MainSingleDetailFragment fragment = new MainSingleDetailFragment();
Bundle bundle = transformationLayout.getBundle("TransformationParams", "transitionName");
fragment.setArguments(bundle);

FragmentTransaction fragmentTransaction = requireFragmentManager().beginTransaction();
TransformationCompat.addTransformation(
    fragmentTransaction, transformationLayout, "transitionName");
fragmentTransaction.replace(R.id.main_container, fragment, MainSingleDetailFragment.TAG)
    .addToBackStack(MainSingleDetailFragment.TAG)
    .commit();

Transition name in Fragment A

We must set a specific transition name to the TransformationLayout.<br> If you want to transform a recyclerView's item, set transiton name in onBindViewHolder.

transformationLayout.transitionName = "myTransitionName"

Here is the Java way.

transformationLayout.setTransitionName("myTransitionName");

onTransformationEndContainer in Fragment B

We should get a TransformationLayout.Params from the arguments, and call onTransformationEndContainer method.<br> It must be called in onCreate method.

override fun onCreate(savedInstanceState: Bundle?) {
  super.onCreate(savedInstanceState)

  val params = arguments?.getParcelable<TransformationLayout.Params>("TransformationParams")
  onTransformationEndContainer(params)
}

Here is the Java way.

TransformationLayout.Params params = getArguments().getParcelable("TransformationParams");
TransformationCompat.onTransformationEndContainer(this, params);

Transition name in Fragment B

And finally set the specific transition name (same as the transformationLayot in Fragment A) <br> to the target view in Fragment B in onViewCreated.

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
  super.onViewCreated(view, savedInstanceState)
   
  detail_container.transitionName = "myTransitionName"
}

TransformationLayout Attributes

Additional 🎈

You can reference the usage of the TransformationLayout in another repository MarvelHeroes. <br> A demo application based on modern Android application tech-stacks and MVVM architecture.

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License

Copyright 2020 skydoves (Jaewoong Eum)

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.