How to set swipeback container transparent

[kangnixi]

I try to use

.setSwipeBackContainerBackgroundColor(android.R.color.transparent)

it doesn't work

[sockeqwe]

Never done that before, but I think you are on the right track with .setSwipeBackContainerBackgroundColor(android.R.color.transparent). Additionally you have to set the (or remove) activities background as described here: http://nullpointerbay.com/2015/08/13/android-appcompat-design-lib-activity-transparency.html

[kangnixi]

Thanks for your replied
I resolve it.
except your said

it need to set MainActivity style:
<item name="android:windowIsTranslucent">false</item>
<item name="android:windowBackground">@color/windowBackgroundGray</item>
<item name="android:colorBackgroundCacheHint">@null</item>

And set other swipe back activity style:
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">@android:color/transparent</item>

I have another question, how to set mSwipeBackViewSize by xml ?

Now I set it by code:
SwipeBack.setSize(100)