I\'ve done a few researches on this topic but I couldn\'t found some solution for my App/ Activity.
Try this:
First of all add custom color in colors.xml like below:
#80FFFFFF
Then Set this color as background of main layout of your Where to? xml file.
And in this line #80 is opacity(in short, opposite of transparent) of color.
First two letters ahead of color:
Change in XML with below and try
I hope this will solve your problem.