单击动画制作Fab(放大/缩小)

Question

我试图模仿动画和下面的浮动动作按钮的颜色变化.

浮动操作按钮的工作方式是白色关闭,蓝色打开.

但是,我没有成功完成动画和改变颜色.

这些都是我尝试这样做的,因为你可以看到我已经评论了我尝试过的所有不同方法.

这是我的代码:

    @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();
        }
    }

非常感谢任何建议.

Answer 1

这个动画有两个阶段.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找到合适的插值器AnimatorSet,因为它不是标准插值器.

看,我们希望fab超调,然后下冲,然后最终稳定到动画师中的指定值.

幸运的是,它非常方便PathInterpolator,它将为我们提供插补器Path.

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);

那么,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(心脏的颜色和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);

看到这里,我们使用pathInterpolator了之前创建的.

我们希望AnimatorSet按顺序播放这两个:

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,我们希望在动画制作时禁用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:

github的源代码