Android: Animation Position Resets After Complete

Question

I\'m using an xml defined animation to slide a view off the screen. The problem is, as soon as the animation completes it resets to its original position. I need to know how

Answer 1

Use helper methods below to easily animate your view. Then you can animate and reset after completion like this:

// Animate the view:

fly(
  view1,
  (float) 0,
  (float) 0,
  (float) 0,
  (float) 1000,
  250,
  null,
  null,
  () -> {

    // Return the view to initial position on animation end:  

    fly(
      view1,
      (float) 0,
      (float) 0,
      (float) 0,
      (float) 0,
      0);

    return null;
  });

Helper methods:

/**
 * Translation of a view.
 */
public static void fly(
  View view,
  float fromXDelta,
  float toXDelta,
  float fromYDelta,
  float toYDelta,
  int duration) {

  fly(
    view,
    fromXDelta,
    toXDelta,
    fromYDelta,
    toYDelta,
    duration,
    null,
    null,
    null);
}

/**
 * Translation of a view with handlers.
 *
 * @param view       A view to animate.
 * @param fromXDelta Amount to shift by X axis for start position.
 * @param toXDelta   Amount to shift by X axis for end position.
 * @param fromYDelta Amount to shift by Y axis for start position.
 * @param toYDelta   Amount to shift by Y axis for end position.
 * @param duration   Animation duration.
 * @param start      On animation start. Otherwise NULL.
 * @param repeat     On animation repeat. Otherwise NULL.
 * @param end        On animation end. Otherwise NULL.
 */
public static void fly(
  View view,
  float fromXDelta,
  float toXDelta,
  float fromYDelta,
  float toYDelta,
  int duration,
  Callable start,
  Callable repeat,
  Callable end) {

  Animation animation;

  animation =
    new TranslateAnimation(
      fromXDelta,
      toXDelta,
      fromYDelta,
      toYDelta);

  animation.setDuration(
    duration);

  animation.setInterpolator(
    new DecelerateInterpolator());

  animation.setFillAfter(true);

  view.startAnimation(
    animation);

  animation.setAnimationListener(new AnimationListener() {

    @Override
    public void onAnimationStart(Animation animation) {

      if (start != null) {
        try {

          start.call();

        } catch (Exception e) {
          e.printStackTrace();
        }
      }

    }

    @Override
    public void onAnimationEnd(Animation animation) {

      if (end != null) {
        try {

          end.call();

        } catch (Exception e) {
          e.printStackTrace();
        }
      }
    }

    @Override
    public void onAnimationRepeat(
      Animation animation) {

      if (repeat != null) {
        try {

          repeat.call();

        } catch (Exception e) {
          e.printStackTrace();
        }
      }  
    }
  });
}