Transitioner provides easy, dynamic and adjustable animation between two views with nested children.

Usage

First you need to create a Transitioner object containing your original and ending views:

val transition = Transitioner(original_view, ending_view)

The view pairs must have matching "tag" attributes so that they can be bound together:

<ConstraintLayout
        android:id="@+id/original_view"
        android:tag="constrView"
        android:layout_width="180dp"
        android:layout_height="180dp">

        <TextView
            android:id="@+id/text"
            android:tag="firstView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
</ConstraintLayout>

<ConstraintLayout
        android:id="@+id/ending_view"
        android:tag="constrView"
        android:layout_width="280dp"
        android:layout_height="280dp">

        <EditText
            android:id="@+id/text3"
            android:tag="firstView"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
 </ConstraintLayout>

I recommend you hide the second view layout, since it's only used as a placeholder for the end destination. The views can be of any type, you can mix and match them, the two layouts can have a different number of views and nested layouts are 100% supported. The only things to keep in mind are:

• all views which you would want to match together must have the same tag attribute in both layouts

• all unmatched views will remain at their original place inside the original layout

• the second layout is just a placeholder. It doesn't hold any logic, it only shows where the original layout should move to.

Basic Usage

 transition.setProgress(0.5f)
 //or
 transition.setProgress(50)

Additional methods and tweaks

transition.duration = 500

transition.interpolator = AccelerateDecelerateInterpolator()

transition.animateTo(0f)

transition.onPercentChanged {
//triggered on every progress change of the transition
    seekBar.progress = (it * 100).toInt()
    }
    
val progress: Float = transition.currentProgress

Here is a preview of a simple application made using this library

Another one, implemented in a weather app

These effects can be reproduced by placing the "Transitioner.setProgress(Float)" function inside a onTouch or a onProgressChanged method.

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Download

Gradle

dependencies {
  compile 'bg.devlabs.transitioner:transitioner:<latest_version>'
}

Maven

<dependency>
  <groupId>bg.devlabs.transitioner</groupId>
  <artifactId>transitioner</artifactId>
  <version>latest_version</version>
  <type>pom</type>
</dependency>

Manually

You can also manually download the library class and use it in your application.

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Compatibility

Minimum Android SDK: API level 19

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Author

Radoslav Yankov @Radoslav_Y

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Getting help

If you spot a problem you can open an issue on the Github page, or alternatively, you can tweet us at @devlabsbg

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License

Transitioner is released under the MIT License.