I really don't understand your question, but if you try to make the navigation box transparent, use the following code:
android:background="#60FFFFFF"
If "60" is about 38% transparency (60 in hexadecimal is 96 in decimal, so 96/255%).
But if your navigation box is already transparent, I used the code:
android:background="#FFFFFF"
It works great and is not transparent.
Both colors are the HTML color code for white, a simple Google search will find the code for other colors for you.
Patrick dibb
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