android - Why background drawable retain its state after activity finished? -

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i have custom viewgroup, 1 thing, changing background's alpha on layout phase:

@override protected void onlayout(boolean changed, int l, int t, int r, int b) {         ...         getbackground().setalpha(0);         ... }

print alpha in setbackground:

@override public void setbackground(drawable background) {     if (background instanceof colordrawable) {                    bgalpha = color.alpha(((colordrawable) background).getcolor());         d("bg:" + integer.tohexstring(bgalpha));         super.setbackground(background);     } else {        ...     } }

now have activity inflate custom view layout xml:

   <customviewgroup         android:layout_width="match_parent"         android:layout_height="match_parent"         android:background="#88000000" />

when first launch app, setbackground print:

bg:88

then finish app , reopen launcher, setbackground print:

bg:0

why background drawable retain state after activity finished?


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