How to have a transparent ImageButton: Android

Question

<ImageButton android:id="@+id/previous"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="@drawable/media_skip_backward"
android:background="@drawable/transparent"></ImageButton>

This is what I tried to get a transparent ImageButton so as to place those buttons on a SurfaceView. But Eclipse, gives me an error in the project as soon as I include the transparent line in xml.

Please help.

Answer 1

Try using null for the background ...

android:background="@null"

Answer 2

Remove this line :

android:background="@drawable/transparent">

And in your activity class set

ImageButton btn = (ImageButton)findViewById(R.id.previous);
btn.setAlpha(100);

You can set alpha level 0 to 255

o means transparent and 255 means opaque.