Exploring Android Animation and Transition Framework

Android animation and transition frameworks provide a wide range of possibilities for creating smooth and engaging user interfaces. In this blog post, we will explore the basics of animation and transition frameworks in Android development, using both Kotlin and Java programming languages.

Animation in Android

Animations in Android are used to create visual effects and movements on the user interface. Android provides several animation techniques, such as View animation and Property animation.

View Animation

View animation is a basic form of animation in Android. It operates on the View object by changing its visual properties, such as rotation, scale, translation, and alpha values. View animation can be defined either in XML or programmatically.

Here is an example of scale animation defined in XML:

<set xmlns:android="http://schemas.android.com/apk/res/android"
     android:fillEnabled="true"
     android:fillAfter="true">
    <scale
        android:fromXScale="1.0"
        android:toXScale="2.0"
        android:fromYScale="1.0"
        android:toYScale="2.0"
        android:pivotX="50%" 
        android:pivotY="50%"
        android:duration="1000"/>
</set>

To apply this animation to a View, we can use the following code:

val animation = AnimationUtils.loadAnimation(context, R.anim.scale_animation)
view.startAnimation(animation)

Property Animation

Property animation is a more flexible and powerful animation technique in Android. It animates the properties of an object, rather than just changing the visual appearance of a View.

In Kotlin, we can define a property animation like this:

val animator = ObjectAnimator.ofFloat(view, "rotation", 0f, 360f)
animator.duration = 1000
animator.start()

In Java, the equivalent code would be:

ObjectAnimator animator = ObjectAnimator.ofFloat(view, "rotation", 0f, 360f);
animator.setDuration(1000);
animator.start();

Transition in Android

Transitions in Android are animations that can be applied to the entire screen or shared elements between activities or fragments. Android provides several built-in transitions, such as Explode, Slide, and Fade.

Shared Element Transition

Shared element transition is a popular animation technique in Android, where a view or element smoothly transitions between two different screens. To define a shared element transition, we need to specify a transition name for the shared element in both the source and destination activities or fragments.

In Kotlin, we can define a shared element transition like this:

val transitionName = "my_element"
val intent = Intent(this, DestinationActivity::class.java)
val options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, view, transitionName)
startActivity(intent, options.toBundle())

In Java, the equivalent code would be:

String transitionName = "my_element";
Intent intent = new Intent(this, DestinationActivity.class);
ActivityOptionsCompat options = ActivityOptionsCompat.makeSceneTransitionAnimation(this, view, transitionName);
startActivity(intent, options.toBundle());

Transition Animation

Transition animation is used for animating the entire screen between activities or fragments. It provides a seamless visual experience as the user navigates between different screens. To define a transition animation, we need to specify the enter and exit animation for the activities or fragments.

In Kotlin, we can define a transition animation like this:

val intent = Intent(this, DestinationActivity::class.java)
val options = ActivityOptionsCompat.makeCustomAnimation(this, R.anim.enter_animation, R.anim.exit_animation)
startActivity(intent, options.toBundle())

In Java, the equivalent code would be:

Intent intent = new Intent(this, DestinationActivity.class);
ActivityOptionsCompat options = ActivityOptionsCompat.makeCustomAnimation(this, R.anim.enter_animation, R.anim.exit_animation);
startActivity(intent, options.toBundle());

Conclusion

Android animation and transition frameworks offer powerful and flexible tools for creating visually compelling user interfaces. Both Kotlin and Java can be used to implement these animations and transitions, providing developers with multiple options to enhance the user experience. By leveraging these frameworks, developers can create more engaging and interactive Android applications.

本文来自极简博客，作者：时光倒流，转载请注明原文链接：Exploring Android Animation and Transition Framework