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Adding ability to change popup icon dynamically#320

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AkshayChordiya wants to merge 2 commits intogabrielemariotti:masterfrom
AkshayChordiya:master
Open

Adding ability to change popup icon dynamically#320
AkshayChordiya wants to merge 2 commits intogabrielemariotti:masterfrom
AkshayChordiya:master

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@AkshayChordiya
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Hi @gabrielemariotti

I needed ability to change popup drawable (icon) dynamically so I made it for my app & thought to share with everyone hence created a pull request.

There is small catch to this technique -
As I have set default popup drawable to NULL in style.xml, we need to always specify drawable from Java code as shown below.

Add this line in where you have used CardHeader

header.setPopupButtonDrawable(R.drawable.your_drawable);

Made popup drawable to NULL so that it can be dynamically updated
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