Activity & Button (ETC 컨트롤) 투명하게 만들기

1. Activity 투명 설정
- 'AndroidManifest.xml'
=> android:theme="@android:style/Theme.Translucent"



2. Button & ETC Control 투명 설정
ex)
Button = (Button)findViewById(R.id.button);
Drawable alpha = Button.getBackground();
alpha.setAlpha(50);