Question

I am trying to mimic animation and the color change for the following floating action button.

The way the floating action button works is white is off and blue is on.

However, I have been unsuccessful with the animation and changing the color.

These have been my attempts at doing this, as you can see I have commented out all the different ways I have tried to do this.

This is my code:

    @SuppressWarnings("unused")
    @OnClick(R.id.fabMovieFavourite)
    public void addMovieFavourite(View view) {
 /*       final Animator animator = AnimatorInflater.loadAnimator(getActivity(), R.animator.add_favourite_movie);
        animator.setTarget(view);)
        animator.start();
 */
/*
        AnimatorSet animatorSet = new AnimatorSet();
        PropertyValuesHolder propertyValuesHolderX = PropertyValuesHolder.ofFloat(View.SCALE_X, 1.1f);
        PropertyValuesHolder propertyValuesHolderY = PropertyValuesHolder.ofFloat(View.SCALE_Y, 1.1f);
        ObjectAnimator objectAnimator = ObjectAnimator.ofPropertyValuesHolder(view, propertyValuesHolderX, propertyValuesHolderY);
        objectAnimator.setDuration(300);
        objectAnimator.setInterpolator(new OvershootInterpolator(10f));
*/

        /*
        objectAnimator.setRepeatCount(1);
        objectAnimator.setRepeatMode(ObjectAnimator.REVERSE);
*/

/*
        PropertyValuesHolder propertyValuesHolderX2 = PropertyValuesHolder.ofFloat(View.SCALE_X, 0.9f);
        PropertyValuesHolder propertyValuesHolderY2 = PropertyValuesHolder.ofFloat(View.SCALE_Y, 0.9f);
        ObjectAnimator objectAnimator2 = ObjectAnimator.ofPropertyValuesHolder(view, propertyValuesHolderX2, propertyValuesHolderY2);
        objectAnimator.setDuration(300);
        objectAnimator2.setInterpolator(new OvershootInterpolator(10f));

        animatorSet.playSequentially(objectAnimator, objectAnimator2);
        objectAnimator.start();
*/

      //  view.BackgroundTintList(ContextCompat.getColorStateList(getContext(), R.color.primary));
        //view.setBackgroundColor(ContextCompat.getColor(getActivity(), R.color.primary));

        if(Build.VERSION.SDK_INT > Build.VERSION_CODES.LOLLIPOP) {
            Timber.d("start translationZ");
            ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(view, View.TRANSLATION_Z, 12f);
            objectAnimator.setDuration(300);
            objectAnimator.setInterpolator(new OvershootInterpolator(10f));
            objectAnimator.setTarget(view);
            objectAnimator.start();
        }
    }

Many thanks for any suggestions.

Answer 1

这个动画中有两个阶段。第一个缩放X和Y轴，第二个缩小它。因此，我们可以将它们分成两个AnimatorSet并按顺序播放它们。

动画的关键点是为第二个AnimatorSet找到合适的插值器，因为它不是标准插值器。

看，我们希望fab超调，然后下冲，然后最终达到动画师的指定值。

幸运的是，有一个非常方便的PathInterpolator，它将为我们提供Path的内插器。

Path path = new Path();
path.moveTo(0.0f, 0.0f);
path.lineTo(0.5f, 1.3f);
path.lineTo(0.75f, 0.8f);
path.lineTo(1.0f, 1.0f);
PathInterpolator pathInterpolator = new PathInterpolator(path);

所以，让我们创建第一个动画：

final float from = 1.0f;
final float to = 1.3f;

ObjectAnimator scaleX = ObjectAnimator.ofFloat(fab, View.SCALE_X, from, to);
ObjectAnimator scaleY = ObjectAnimator.ofFloat(fab, View.SCALE_Y,  from, to);
ObjectAnimator translationZ = ObjectAnimator.ofFloat(fab, View.TRANSLATION_Z, from, to);

AnimatorSet set1 = new AnimatorSet();
set1.playTogether(scaleX, scaleY, translationZ);
set1.setDuration(100);
set1.setInterpolator(new AccelerateInterpolator());

set1.addListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        fab.setImageResource(isActive ? R.drawable.heart_active : R.drawable.heart_passive);
        fab.setBackgroundTintList(ColorStateList.valueOf(isActive ? colorActive : colorPassive));
        isActive = !isActive;
    }
});

我们正在缩放x，y。此外，我们正在改变z平移以具有适当的阴影效果。当动画结束时，我们想要改变fab状态（心脏颜色和fab背景）。

现在让我们创建动画来解决：

ObjectAnimator scaleXBack = ObjectAnimator.ofFloat(fab, View.SCALE_X, to, from);
ObjectAnimator scaleYBack = ObjectAnimator.ofFloat(fab, View.SCALE_Y, to, from);
ObjectAnimator translationZBack = ObjectAnimator.ofFloat(fab, View.TRANSLATION_Z, to, from);

AnimatorSet set2 = new AnimatorSet();
set2.playTogether(scaleXBack, scaleYBack, translationZBack);
set2.setDuration(300);
set2.setInterpolator(pathInterpolator);

请参阅此处，我们使用了之前创建的pathInterpolator。

我们希望按顺序播放这两个AnimatorSet：

final AnimatorSet set = new AnimatorSet();
set.playSequentially(set1, set2);

set.addListener(new AnimatorListenerAdapter() {
    @Override
    public void onAnimationEnd(Animator animation) {
        fab.setClickable(true);
    }

    @Override
    public void onAnimationStart(Animator animation) {
        fab.setClickable(false);
    }
});

此外，我们希望在制作动画时禁用fab的点击次数。所以我们根据动画状态打开/关闭它。

最后，我们在点击发生时启动动画：

fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        set.start();
    }
});

结果：

<强> Source code at github

Animating Fab on click (zoom in/out)

1 个答案: