反转显示过渡动画

Question

基于此示例

我使用支持设计库创建了一个工厂来重新创建相同的操作。揭示和工厂动画运作良好，但现在我遇到了两个问题：

1）我的工厂包含一个图标。当fab启动动画时（就像在gif中一样），图标会变成炮轰，因为它会更改scaleX和scaleY。那么有办法防止这种情况吗？

2）该示例创建了动画，但它并没有解释如何反转显示...我希望onKeyDown（）内容被反复出现并再次出现在工厂中。

这是github项目https://github.com/saulmm/Curved-Fab-Reveal-Example 这里是我使用的代码：

首先我的工厂在布局中：

<FrameLayout
        android:id="@+id/fab_container"
        android:layout_below="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="-30dp"
        android:elevation="2dp"
        >
        <include
            android:id="@+id/voice_content"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            layout="@layout/voice_content_layout" />

        <android.support.design.widget.FloatingActionButton
            android:id="@+id/myFAB"
            android:transitionName="button_fab"
            app:backgroundTint="@color/colorAccent"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:src="@drawable/ic_mic_white_24dp"
            app:elevation="2dp"
            app:borderWidth="0dp"
            android:layout_marginRight="16dp"
            android:layout_marginBottom="16dp"
            android:layout_gravity="bottom|right"
            android:layout_alignParentBottom="true"
            android:layout_alignParentEnd="true"
            android:onClick="onFabPressed" />
    </FrameLayout>

这是Java代码的其余部分：

public void onFabPressed(View view) {

        final float startX = myFab.getX();

        AnimatorPath path = new AnimatorPath();
        path.moveTo(0, 0);
        path.curveTo(-200, 200, -400, 100, -600, 50);

        final ObjectAnimator anim = ObjectAnimator.ofObject(this, "fabLoc",
                new PathEvaluator(), path.getPoints().toArray());

        anim.setInterpolator(new AccelerateInterpolator());
        anim.setDuration(ANIMATION_DURATION);
        anim.start();

        anim.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {

            @Override
            public void onAnimationUpdate(ValueAnimator animation) {

                if (Math.abs(startX - myFab.getX()) > MINIMUN_X_DISTANCE) {

                    if (!mRevealFlag) {
                        mFabContainer.setY(mFabContainer.getY() + mFabSize / 2);

                        myFab.animate()
                                .scaleXBy(SCALE_FACTOR)
                                .scaleYBy(SCALE_FACTOR)
                                .setListener(mEndRevealListener)
                                .setDuration(ANIMATION_DURATION);

                        mRevealFlag = true;
                    }
                }
            }
        });
    }

    private AnimatorListenerAdapter mEndRevealListener = new AnimatorListenerAdapter() {

        @Override
        public void onAnimationEnd(Animator animation) {

            super.onAnimationEnd(animation);

            myFab.setVisibility(View.INVISIBLE);
            mFabContainer.setBackgroundColor(getResources().getColor(R.color.colorAccent));

            for (int i = 0; i < voiceContentLayout.getChildCount(); i++) {

                View v = voiceContentLayout.getChildAt(i);
                ViewPropertyAnimator animator = v.animate()
                        .scaleX(1).scaleY(1)
                        .setDuration(ANIMATION_DURATION);

                animator.setStartDelay(i * 50);
                animator.start();
            }
        }
    };
    /**
     * We need this setter to translate between the information the animator
     * produces (a new "PathPoint" describing the current animated location)
     * and the information that the button requires (an xy location). The
     * setter will be called by the ObjectAnimator given the 'fabLoc'
     * property string.
     */
    public void setFabLoc(PathPoint newLoc) {

        myFab.setTranslationX(newLoc.mX);


        if (mRevealFlag)
            myFab.setTranslationY(newLoc.mY - (mFabSize / 2));
        else
            myFab.setTranslationY(newLoc.mY);
    }