Android alpha animation fadein fadeout with delays

Question

I want to do a very simple alpha animation but I cannot find a valid way.

The idea is to perform this animation over a view:

1. alpha from 0 to 1 of 1 second
2. hold alpha at 1 for 5 seconds
3. alpha from 1 to 0 of 1 second
4. hold alpha at 0 for 5 seconds.
5. start again on 1.

I've tried to implement that with an AnimationSet as:

AnimationSet animationSet = new AnimationSet(true);  Animation animation1 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_in); animation1.setDuration(1000);  Animation animation2 = new AnimationUtils.loadAnimation(this, android.R.anim.fade_out); animation2.setDuration(1000); animation2.setStartOffset(5000);  Animation animation3 = new AlphaAnimation(0.0f, 0.0f); animation3.setDuration(4000) animation3.setStartOffset(6000);  animationSet.add(animation1); animationSet.add(animation2); animationSet.add(animation3); 

etc..

but it seams that the third animation do a mess with all the alpha animations, I supose that this cause an internal incoherence in the way that Android manage this type of animation.

Any idea?

Thank you.

Answer 1

Ok Keep in mind these 2 points to solve this

---

• If I want to animate 1.0f to 0.0f after 5 seconds with an animation duration of 1 seconds, this is ultimately a 1 second animation with a pause of 5 seconds.

  To acheive this:

  1. setDuration(1000) (it has a 1 second duration)
  2. setStartOffset(5000) (it will start after 5 seconds)

---

• You only need 2 animations that will loop forever.

  1.0.0f to 1.0f with 5 seconds pause and 1 second duration

  2.1.0f to 0.0f with 5 seconds pause and 1 second duration

---

And here is the code:

    animation1 = new AlphaAnimation(0.0f, 1.0f);     animation1.setDuration(1000);     animation1.setStartOffset(5000);      animation2 = new AlphaAnimation(1.0f, 0.0f);     animation2.setDuration(1000);     animation2.setStartOffset(5000);      textView.startAnimation(animation1); 

However to loop forever I will use AnimationListener because repeatCount is buggy:

    animation1 = new AlphaAnimation(0.0f, 1.0f);     animation1.setDuration(1000);     animation1.setStartOffset(5000);      //animation1 AnimationListener     animation1.setAnimationListener(new AnimationListener(){          @Override         public void onAnimationEnd(Animation arg0) {             // start animation2 when animation1 ends (continue)             textView.startAnimation(animation2);         }          @Override         public void onAnimationRepeat(Animation arg0) {             // TODO Auto-generated method stub          }          @Override         public void onAnimationStart(Animation arg0) {             // TODO Auto-generated method stub          }      });      animation2 = new AlphaAnimation(1.0f, 0.0f);     animation2.setDuration(1000);     animation2.setStartOffset(5000);      //animation2 AnimationListener     animation2.setAnimationListener(new AnimationListener(){          @Override         public void onAnimationEnd(Animation arg0) {             // start animation1 when animation2 ends (repeat)             textView.startAnimation(animation1);         }          @Override         public void onAnimationRepeat(Animation arg0) {             // TODO Auto-generated method stub          }          @Override         public void onAnimationStart(Animation arg0) {             // TODO Auto-generated method stub          }      });      textView.startAnimation(animation1); 

Answer 2

There is a simpler solution to this.

Lets assume that your view is in state GONE. To animate to its visibility:

yourView.setVisibility(View.VISIBLE); yourView.animate().alpha(1).setDuration(300); 

Through the same way you can add animation listeners.

This also works for scale and translation animations.