This is an Example app that demonstrates how simple Circular animation transitions can be accomplished from one activity to another on clicking a button. This Example uses an FAB as the button that causes the transition to the second activity.
We first define the layout xml file for the destination activity as follows:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/destination_layout"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#FFC107">
<!-- The actual layout for the destination Activity Goes here -->
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This is the activity that is revealed!!!" />
</FrameLayout>
We employ a frame layout here, but this can be implimented as any other type of layout depending on your need. In the Activity we are going to transition to we will override onCreate() as follows:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_destination);
destinationFrameLayout = (FrameLayout) findViewById(R.id.destination_layout);
if (savedInstanceState == null) {
destinationFrameLayout.setVisibility(View.INVISIBLE);
ViewTreeObserver viewTreeObserver = destinationFrameLayout.getViewTreeObserver();
if (viewTreeObserver.isAlive()) {
viewTreeObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
@Override
public void onGlobalLayout() {
circularRevealTransition(); //Function To start the animation
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.JELLY_BEAN) {
destinationFrameLayout.getViewTreeObserver().removeGlobalOnLayoutListener(this);
} else {
destinationFrameLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
}
}
});
}
}
}
In the above snippet, we see that we are placing the circularRevealTransition() into a OnGlobalLayoutListener, since we need the view to be drawn for the animation. Finally we impliment the circularRevealTrandition() function as follows:
private void circularRevealTransition() {
int X = 9 * destinationFrameLayout.getWidth()/10; //The X coordinate for the initial position
int Y = 9 * destinationFrameLayout.getHeight()/10; //The Y coordinate for the initial position
int Duration = 500; //Duration for the animation
float finalRadius = Math.max(destinationFrameLayout.getWidth(), destinationFrameLayout.getHeight()); //The final radius must be the end points of the current activity
// create the animator for this view, with the start radius as zero
Animator circularReveal = ViewAnimationUtils.createCircularReveal(destinationFrameLayout, X, Y, 0, finalRadius);
circularReveal.setDuration(Duration);
// set the view visible and start the animation
destinationFrameLayout.setVisibility(View.VISIBLE);
// start the animation
circularReveal.start();
}
The MIT License (MIT)
Copyright (c) 2014-2016 Akhil Sudhakaran
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