How do you make this type of button?
I think it is Android 4+ and it’s often seen in Google’s applications.

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In a rectangular image draw the arrow shape filled with any color you want for background and leave the 2 triangles that fill the rectangle (outside the arrow) white. Save the file as .png and use it as a background of a button. The white triangles will be drawn as transparent.
You can also make it 9 patch to allow different text lengths inside the button.