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There are a lot of transparency in the implementation, usps stamps you can code, can be directly implemented in the layout file. Simple usps stamps point is located directly to the controls transparent background: android: background = "# 88323232" above are common gray translucent effect, when you set a wrong color values will get the following message: Error: Color value not valid - must be #rgb, #argb, #rrggbb, or #aarrggbb relative to our common #rrggbb, plus aa beginning is the color to translucent, of course, any color can be set translucent effect, and we guess aa this double-digit corresponds transparency Sure enough, when I tested # 00323232 to # 99323232 different representations, the transparency is changing, 00 is completely transparent, but 99 is not "opaque", but from 00-99 transparency gradually weakened. Let's look at the test results map: android: background = "# 00323232" android: background = "# 50323232" android: background = "# 99323232"
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