可以用到简单的xml的背景框

<!--白色透明度--> <color name="translucent_white_05">#f2ffffff</color> <color name="translucent_white_10">#e6ffffff</color> <color name="translucent_white_15">#d9ffffff</color> <color name="translucent_white_20">#ccffffff</color> <color name="translucent_white_25">#bfffffff</color> <color name="translucent_white_30">#b3ffffff</color> <color name="translucent_white_35">#a6ffffff</color> <color name="translucent_white_40">#99ffffff</color> <color name="translucent_white_45">#8cffffff</color> <color name="translucent_white_50">#80ffffff</color> <color name="translucent_white_55">#73ffffff</color> <color name="translucent_white_60">#66ffffff</color> <color name="translucent_white_65">#59ffffff</color> <color name="translucent_white_70">#4dffffff</color> <color name="translucent_white_75">#40ffffff</color> <color name="translucent_white_80">#33ffffff</color> <color name="translucent_white_90">#26ffffff</color> <color name="translucent_white_95">#0dffffff</color>

<!--黑色透明度--> <color name="translucent_black_05">#f2000000</color> <color name="translucent_black_10">#e6000000</color> <color name="translucent_black_15">#d9000000</color> <color name="translucent_black_20">#cc000000</color> <color name="translucent_black_25">#bf000000</color> <color name="translucent_black_30">#b3000000</color> <color name="translucent_black_35">#a6000000</color> <color name="translucent_black_40">#99000000</color> <color name="translucent_black_45">#8c000000</color> <color name="translucent_black_50">#80000000</color> <color name="translucent_black_55">#73000000</color> <color name="translucent_black_60">#66000000</color> <color name="translucent_black_65">#59000000</color> <color name="translucent_black_70">#4d000000</color> <color name="translucent_black_75">#40000000</color> <color name="translucent_black_80">#33000000</color> <color name="translucent_black_90">#26000000</color> <color name="translucent_black_95">#0d000000</color> </resources>

半透明值: