Android: show/hide a view using an animation

Question

I've been looking through many google results / questions on here to determine how to show/hide a view via a vertical animation, but I can't seem to find one that's exactly right or not too vague.

I have a layout (undo bar) that's below another layout and above multiple other widgets; this undo bar should vertically slide open and slide closed, depending on the circumstances.

Currently all I do right now is set the view to be visible or gone.

Answer 1

Set the attribute android:animateLayoutChanges="true" inside the parent layout .

Put the view in a layout if its not and set android:animateLayoutChanges="true" for that layout.

NOTE: This works only from API Level 11+ (Android 3.0)

Answer 2

I created an extension for RelativeLayout that shows/hides Layouts with animations. It can extend any kind of View to gain these features.

import android.content.Context; import android.util.AttributeSet; import android.view.View; import android.view.animation.Animation; import android.view.animation.AnimationSet; import android.view.animation.AnimationUtils; import android.widget.RelativeLayout;  public class AnimatingRelativeLayout extends RelativeLayout {     Context context;     Animation inAnimation;     Animation outAnimation;      public AnimatingRelativeLayout(Context context)     {         super(context);         this.context = context;         initAnimations();      }      public AnimatingRelativeLayout(Context context, AttributeSet attrs)     {         super(context, attrs);         this.context = context;         initAnimations();     }      public AnimatingRelativeLayout(Context context, AttributeSet attrs, int defStyle)     {         super(context, attrs, defStyle);         this.context = context;         initAnimations();     }      private void initAnimations()     {         inAnimation = (AnimationSet) AnimationUtils.loadAnimation(context, R.anim.in_animation);         outAnimation = (Animation) AnimationUtils.loadAnimation(context, R.anim.out_animation);     }      public void show()     {         if (isVisible()) return;         show(true);     }      public void show(boolean withAnimation)     {         if (withAnimation) this.startAnimation(inAnimation);         this.setVisibility(View.VISIBLE);     }      public void hide()     {         if (!isVisible()) return;         hide(true);     }      public void hide(boolean withAnimation)     {         if (withAnimation) this.startAnimation(outAnimation);         this.setVisibility(View.GONE);     }      public boolean isVisible()     {         return (this.getVisibility() == View.VISIBLE);     }      public void overrideDefaultInAnimation(Animation inAnimation)     {         this.inAnimation = inAnimation;     }      public void overrideDefaultOutAnimation(Animation outAnimation)     {         this.outAnimation = outAnimation;     } } 

You can override the original Animations using overrideDefaultInAnimation and overrideDefaultOutAnimation

My original Animations were fadeIn/Out, I am adding XML animation files for Translating in/out of the screen (Translate to top and from top)

in_animation.xml:

    <?xml version="1.0" encoding="utf-8"?> <translate xmlns:android="http://schemas.android.com/apk/res/android"     android:duration="600"     android:fillAfter="false"     android:fromXDelta="0"     android:fromYDelta="-100%p"     android:toXDelta="0"     android:toYDelta="0" /> 

out_animation.xml:

  <?xml version="1.0" encoding="utf-8"?> <translate xmlns:android="http://schemas.android.com/apk/res/android"     android:duration="600"     android:fillAfter="false"     android:fromXDelta="0"     android:fromYDelta="0"     android:toXDelta="0"     android:toYDelta="-100%p" />