Android - getAlpha () from animated view

Question

I have an animation:

Animation fadeOut = new AlphaAnimation(1, 0);
fadeOut.setInterpolator(new DecelerateInterpolator());
fadeOut.setDuration(350);
myView.startAnimation(fadeOut);

I am trying to get it Alpha durring Animation as such:

System.out.println(myView.getAlpha());

However, it always returns “1.0” throughout the animation. How can I get the actual alpha value myViewduring the animation process?

Answer 1

Using Transformationwith yours AlphaAnimation, you can get the alpha value directly from your object AlphaAnimationinstead View.

Purpose of using transformation:

Defines the transformation that should be applied at one point in time in the animation.

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Steps:

• Transformation.java, https://sourcegraph.com/android.googlesource.com/platform/frameworks/base/-/blob/core/java/android/view/animation/Transformation.java.

• Transformation:

  private Transformation myTransformation;
  mTransformation = new Transformation();
  

• :

  Animation fadeOut = new AlphaAnimation(1, 0);
  fadeOut.setInterpolator(new DecelerateInterpolator());
  fadeOut.setDuration(350);
  

• ( ):

  final long time = myView.getDrawingTime();
  

• . , :

  fadeOut.getTransformation(time, myTransformation);
  final float myAlphaValue = myTransformation.getAlpha();
  

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: https://sourcegraph.com/android.googlesource.com/platform/frameworks/base/-/blob/core/java/android/widget/ProgressBar.java#L1699 https://developer.android.com/reference/android/view/animation/Animation.html https://developer.android.com/reference/android/view/animation/Transformation.html