How to Set Opacity (Alpha) for View in Android

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I’m amazed by everyone else’s MUCH more complicated answers.

XML

You can very simply define the alpha in the color definition of the button (or any other view) in your xml:

android:color="#66FF0000"    // Partially transparent red

In the above example, the color would be a partially transparent red.

When defining the color of a view, the format can be either #RRGGBB or #AARRGGBB, where AA is the hex alpha value. FF would be fully opaque and 00 would be full transparent.

Dynamically

If you need to dynamically alter the opacity in your code, use

myButton.getBackground().setAlpha(128);  // 50% transparent

Where the INT ranges from 0 (fully transparent) to 255 (fully opaque).

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