hide/show fab with scale animation

问题

I'm using custom floatingactionmenu. I need to implement scale animation on show/hide menu button like here floating action button behaviour

Is there any way to do this ?

回答1:

You can use these scale animations for fab button, it gives same effect like design lib fab button.

scale_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <scale
        android:duration="100"
        android:fromXScale="0"
        android:fromYScale="0"
        android:pivotX="85%"
        android:pivotY="85%"
        android:toXScale="1.0"
        android:toYScale="1.0" />
</set>

scale_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <scale
        android:duration="100"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:pivotX="85%"
        android:pivotY="85%"
        android:toXScale="0"
        android:toYScale="0" />
</set>

回答2:

The design support library revision 22.2.1 added the hide() and show() methods to the FloatingActionButton class, so you can use these from now on.

FloatingActionButton mFab;
mFab.hide();
mFab.show();

You can apply your own animation on it. For more info check this.
And for more information about FAB, check the official documentation.

回答3:

Load these animation on your custom view. Don't forget to set pivot point to 50% and interpolator to linear interpolator.

scale_up.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <scale
        android:duration="100"
        android:fromXScale="0"
        android:fromYScale="0"
        android:interpolator="@android:anim/linear_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="1.0"
        android:toYScale="1.0" />
</set>

scale_down.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android" >
    <scale
        android:duration="100"
        android:fromXScale="1.0"
        android:fromYScale="1.0"
        android:interpolator="@android:anim/linear_interpolator"
        android:pivotX="50%"
        android:pivotY="50%"
        android:toXScale="0"
        android:toYScale="0" />
</set>

来源：https://stackoverflow.com/questions/34553755/hide-show-fab-with-scale-animation

标签

android

material-design

floating-action-button