Android Resources suggest change

Color TransparencyAlpha Level

Hex Opacity Values

------------------------------
|   Alpha(%)  |   Hex Value    |
------------------------------
|    100%     |      FF        |
|     95%     |      F2        |
|     90%     |      E6        |
|     85%     |      D9        |
|     80%     |      CC        |
|     75%     |      BF        |
|     70%     |      B3        |
|     65%     |      A6        |
|     60%     |      99        |
|     55%     |      8C        |
|     50%     |      80        |
|     45%     |      73        |
|     40%     |      66        |
|     35%     |      59        |
|     30%     |      4D        |
|     25%     |      40        |
|     20%     |      33        |
|     15%     |      26        |
|     10%     |      1A        |
|      5%     |      0D        |
|      0%     |      00        |
------------------------------

If you want to set 45% to red color.

<color name="red_with_alpha_45">#73FF0000</color>

hex value for red - #FF0000

You can add 73 for 45% opacity in prefix - #73FF0000

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