Android and setting alpha for image view alpha

Question

Is there really no XML attribute counterpart to setAlpha int    If not  what alternatives are there

User · Answer

I am not sure about the XML but you can do it by code in the following way.

ImageView myImageView = new ImageView(this);
myImageView.setAlpha(xxx);

In pre-API 11:

range is from 0 to 255 (inclusive), 0 being transparent and 255 being opaque.

In API 11+:

range is from 0f to 1f (inclusive), 0f being transparent and 1f being opaque.

User · Answer

Maybe a helpful alternative for a plain-colored background    Put a LinearLayout over the ImageView and use the LinearLayout as a opacity filter  In the following a small example with a black background    lt LinearLayout xmlns android  http   schemas android com apk res android  android id    id layout  android layout width  match parent  android layout height  match parent  android background   FF000000   gt    lt RelativeLayout     android id    id relativeLayout2      android layout width  match parent      android layout height  wrap content   gt        lt ImageView         android id    id imageView          android layout width  wrap content          android layout height  wrap content          android src   drawable icon stop big    gt        lt LinearLayout         android id    id opacityFilter          android layout width  fill parent          android layout height  fill parent          android background   CC000000          android orientation  vertical   gt       lt  LinearLayout gt   lt  RelativeLayout gt      Vary the android background attribute of the LinearLayout between  00000000  fully transparent  and  FF000000  fully opaque

User · Answer

setAlpha int  is deprecated as of API 16  Android 4 1  Please use setImageAlpha int  instead

User · Answer

Use this form to ancient version of android   ImageView myImageView  myImageView    ImageView  findViewById R id img    AlphaAnimation alpha   new AlphaAnimation 0 5F  0 5F   alpha setDuration 0    alpha setFillAfter true    myImageView startAnimation alpha

User · Answer

It s easier than the other response  There is an xml value alpha that takes double values   android alpha  0 0   thats invisible  android alpha  0 5   see-through  android alpha  1 0   full visible  That s how it works

User · Answer

There is now an XML alternative            lt ImageView         android id    id example          android layout width  wrap content          android layout height  wrap content          android src   drawable example          android alpha  0 7    gt    It is  android alpha  0 7   With a value from 0  transparent  to 1  opaque

User · Answer

use android alpha 0 5 to achieve the opacity of 50  and to turn Android Material icons from Black to Grey

User · Answer

The alpha can be set along with the color using the following hex format  ARGB or  AARRGGBB  See http   developer android com guide topics resources color-list-resource html

User · Answer

No  there is not  see how the  Related XML Attributes  section is missing in the ImageView setAlpha int  documentation  The alternative is to use View setAlpha float  whose XML counterpart is android alpha  It takes a range of 0 0 to 1 0 instead of 0 to 255  Use it e g  like   lt ImageView android alpha  0 4  gt    However  the latter in available only since API level 11

[android] Android and setting alpha for (image) view alpha

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