[Android Course][English][Theme] - Activity & Button (ETC control) make Transparent

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



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



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