浮动按钮的弹出菜单动画
将几个按钮重叠摆放，使用ValueAnimator更新按钮的坐标实现。
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(); }