How to show a widget graph in an Activity class - android

I am a bit new to android development so excuse me about that.
There is an Android Studio project on github: https://github.com/codeka/advbatterygraph
I compiled and installed it on my Nexus 5 and it worked fine. It's a widget which shows a graph with details about battery properties.
I'm trying to show this graph in a Activity class.
I searched a lot and tried to show it using ImageView but couldn't figured it out how to achieve it.
Any help/idea would be much appreciated!
Thanks.

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Are "spinner" and "expandableListView" items present in Android Studio 3.5.3

Good day to everyone! This is my first question :)
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Here an image about the palette I have in the android studio.
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Hi I can see this might be an old question but. Hope this helps newbies...
I am using Android Studio 1.0.2 and has some awesome features to generate most of the stuff that if you follow many tutorials out there. Is just a click away. On android studio i'm using just right click, select new and Widget App > then every file needed is generated for you based on the size of widget you want.
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