浮動按鈕的彈出菜單動畫

floatActionButton

將幾個按鈕重疊擺放饱狂，使用ValueAnimator更新按鈕的坐標(biāo)實現(xiàn)休讳。

布局

<FrameLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/float_btn1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="10dp"
        android:src="@mipmap/fav_2"
        app:elevation="5dp"
        app:fabSize="normal" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/float_btn2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="10dp"
        android:src="@mipmap/idea"
        app:elevation="5dp"
        app:fabSize="normal" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/float_btn3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="10dp"
        android:src="@mipmap/faxian"
        app:elevation="5dp"
        app:fabSize="normal" />

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/float_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginBottom="20dp"
        android:layout_marginEnd="10dp"
        android:src="@mipmap/menu"
        app:elevation="5dp"
        app:fabSize="normal" />

</FrameLayout>

控制

private FloatingActionButton actionButton, actionButton1, actionButton2, actionButton3;
private boolean menuOpen = false;
private void showMenu() {
        menuOpen = true;
        int x = (int) actionButton.getX();
        int y = (int) actionButton.getY();
        ValueAnimator v1 = ValueAnimator.ofInt(x, x - DISTANCE);
        v1.setDuration(500);
        v1.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int l = (int) animation.getAnimatedValue();
                int t = (int) actionButton1.getY();
                int r = actionButton1.getWidth() + l;
                int b = actionButton1.getHeight() + t;
                actionButton1.layout(l, t, r, b);
            }
        });
        ValueAnimator v2x = ValueAnimator.ofInt(x, x - DISTANCE2);
        ValueAnimator v2y = ValueAnimator.ofInt(y, y - DISTANCE2);
        v2x.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int l = (int) animation.getAnimatedValue();
                int t = (int) actionButton2.getY();
                int r = actionButton2.getWidth() + l;
                int b = actionButton2.getHeight() + t;
                actionButton2.layout(l, t, r, b);
            }
        });
        v2y.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int t = (int) animation.getAnimatedValue();
                int l = (int) actionButton2.getX();
                int r = actionButton2.getWidth() + l;
                int b = actionButton2.getHeight() + t;
                actionButton2.layout(l, t, r, b);
            }
        });
        ValueAnimator v3 = ValueAnimator.ofInt(y, y - DISTANCE);
        v3.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int t = (int) animation.getAnimatedValue();
                int l = (int) actionButton3.getX();
                int r = actionButton3.getWidth() + l;
                int b = actionButton3.getHeight() + t;
                actionButton3.layout(l, t, r, b);
            }
        });
        v1.start();
        v2x.start();
        v2y.start();
        v3.start();
    }

    private void hideMenu() {
        menuOpen = false;
        int x = (int) actionButton1.getX();
        ValueAnimator v1 = ValueAnimator.ofInt(x, (int) actionButton.getX());
        v1.setDuration(500);
        v1.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int l = (int) animation.getAnimatedValue();
                int t = (int) actionButton1.getY();
                int r = actionButton1.getWidth() + l;
                int b = actionButton1.getHeight() + t;
                actionButton1.layout(l, t, r, b);
            }
        });
        x = (int) actionButton2.getX();
        int y = (int) actionButton2.getY();
        ValueAnimator v2x = ValueAnimator.ofInt(x, (int) actionButton.getX());
        ValueAnimator v2y = ValueAnimator.ofInt(y, (int) actionButton.getY());
        v2x.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int l = (int) animation.getAnimatedValue();
                int t = (int) actionButton2.getY();
                int r = actionButton2.getWidth() + l;
                int b = actionButton2.getHeight() + t;
                actionButton2.layout(l, t, r, b);
            }
        });
        v2y.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int t = (int) animation.getAnimatedValue();
                int l = (int) actionButton2.getX();
                int r = actionButton2.getWidth() + l;
                int b = actionButton2.getHeight() + t;
                actionButton2.layout(l, t, r, b);
            }
        });
        y = (int) actionButton3.getY();
        ValueAnimator v3 = ValueAnimator.ofInt(y, (int) actionButton.getY());
        v3.setDuration(500).addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
            @Override
            public void onAnimationUpdate(ValueAnimator animation) {
                int t = (int) animation.getAnimatedValue();
                int l = (int) actionButton3.getX();
                int r = actionButton3.getWidth() + l;
                int b = actionButton3.getHeight() + t;
                actionButton3.layout(l, t, r, b);
            }
        });
        v1.start();
        v2x.start();
        v2y.start();
        v3.start();
    }