update demo Activity with interpolators

Author: Cliffus

app/src/main/java/at/blogc/android/activities/MainActivity.java

@@ -4,6 +4,7 @@
 import android.os.Bundle;
 import android.util.Log;
 import android.view.View;
+import android.view.animation.OvershootInterpolator;
 import android.widget.Button;
 
 import at.blogc.android.views.ExpandableTextView;
@@ -40,6 +41,13 @@ protected void onCreate(Bundle savedInstanceState)
         // set animation duration via code, but preferable in your layout files by using the animation_duration attribute
         expandableTextView.setAnimationDuration(750L);
 
+        // set interpolators for both expanding and collapsing animations
+        expandableTextView.setInterpolator(new OvershootInterpolator());
+
+        // or set them separately
+        expandableTextView.setExpandInterpolator(new OvershootInterpolator());
+        expandableTextView.setCollapseInterpolator(new OvershootInterpolator());
+
         // toggle the ExpandableTextView
         buttonToggle.setOnClickListener(new View.OnClickListener()
         {