Alx wrote:
> Hello all,
>
> I've certainly missed something on how to use ImageView objects but
> I'm lost for now...
>
> So, I've created 2 ImageView, using the same resource :
>
> i0 = new ImageView(this);
> i0.setAdjustViewBounds(true);
> i0.setImageResource(R.drawable.blood_01);
> i0.setLayoutParams(new AbsoluteLayout.LayoutParams
> (99,113,0,0));
> i0.setAlpha(0);
> mAbsoluteLayout.addView(i0);
>
> i1 = new ImageView(this);
> i1.setAdjustViewBounds(true);
> i1.setImageResource(R.drawable.blood_01);
> i1.setLayoutParams(new AbsoluteLayout.LayoutParams
> (99,113,100,0));
> i1.setAlpha(0);
> mAbsoluteLayout.addView(i1);
>
> First, I set the alpha for both ImageView to 0.
>
> When touching the screen, I set this alpha to 255 only for i1.
>
> public boolean onTouch(View v, MotionEvent event)
> {
> switch (event.getAction())
> {
> case MotionEvent.ACTION_DOWN:
> {
> i1.setAlpha(255);
> }
> break;
> (...)
>
> If I do that, both i0 and i1 are displayed (alpha = 255 for both of
> them).
>
>
> If I use 2 different resources for i0 and i1 (by duplicating my
> blood_01.png file for instance)
> it does work fine => only i1 is displayed.
>
>
> So, it looks like the setAlpha is applied to the resource, and not to
> the ImageView.
>
> How can I avoid that?
> I won't duplicate my pictures to work around that.
>
> Any help appreciated.
http://android-developers.blogspot.com/2009/05/drawable-mutations.html
Or, to cut to the punch line:
Drawable star = context.getResources().getDrawable(R.drawable.star);
if (book.isFavorite()) {
star.mutate().setAlpha(255); // opaque
} else {
star.mutate().setAlpha(70); // translucent
}
--
Mark Murphy (a Commons Guy)
http://commonsware.com | http://twitter.com/commonsguy
Need help for your Android OSS project? http://wiki.andmob.org/hado
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