setting transparency to buttons in android

Using XML

If you want to set color and along with that if you want to set transparent then you have to use that color code .

android:color="#66FF0000"    // Partially transparent red
android:alpha="0.25"         // 25% transparent

Using java

And if you want to set dynamically (java code)then try this,

myButton.getBackground().setAlpha(64);  // 25% transparent

- i.e .INT ranges from 0 (fully transparent) to 255 (fully opaque)

You can define your own "transparent" color in styles.xml and play with the alfa of the color, for example:

<color name="Transparent">#00000000</color>
<color name="Transparent80">#80000000</color>

EDIT: second one is 50% transparency

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