Android - PNG image has alpha channel, but when in imageview white background is shown. How can I fix?

Question

Problem:

I have saved a png image into the @drawable folder in android studio. This image is confirmed to have an alpha channel.

Image in android studio:

When I add it to an image view in a relative layout the alpha channel is lost

ImageView image:

xml layout code:

<ImageView
    android:layout_width="100dp"
    android:layout_height="100dp"
    app:srcCompat="@drawable/icon_main"
    android:id="@+id/main_icon_img"
    android:background="@android:color/transparent"
    android:scaleType="fitXY"
    android:adjustViewBounds="true"
    android:layout_marginLeft="31dp"
    android:layout_marginStart="31dp"
    android:layout_marginTop="113dp"
    android:layout_alignParentTop="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true" />

I have tried setting the background to transparent. If I save it to a mipmap then the image will show the alpha channel, although this is not my preferred method.

Is there a reason to why its appearing with a white background?

Did you try another png transparent, and make sure you are viewing the image asset for density visualization, i guess it's a problem with the image file. — betorcs, Jun 21 '17 at 23:07
There is not problem XML..Can you pls try with some other image.. — Raja Jawahar, Jun 21 '17 at 23:11
hmmm, yea you appear to be right its an a problem with the png. I created it with gimp which I have done many times before. I will look into it. Thank you! — user2853442, Jun 21 '17 at 23:14
Is that really a PNG with Alpha channel? Perhaps it has a TRNS chunk instead? https://stackoverflow.com/questions/13569887/libpng-palette-png-with-alpha-or-not/13570973#13570973 — leonbloy, Jun 23 '17 at 12:45
Did you ever figure this out? I'm having the exact same problem. — EpicPandaForce, Sep 05 '18 at 14:07

score 1 · Answer 1 · answered Jan 28 '20 at 11:25

1

For me the problem was

<item name="android:background">@color/white</item>

in the theme style. This made all the views to be drawn with a white BG. Even theTextViews.

answered Jan 28 '20 at 11:25

Saran Sankaran

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score 0 · Answer 2 · answered Sep 30 '20 at 14:59

0

Please check the imageView if it has a background attribute and get rid of it as shown on this image

I also found this site to be so helpful to enable you easily remove background from the image effectively making it PNG

answered Sep 30 '20 at 14:59

Tonnie

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Android - PNG image has alpha channel, but when in imageview white background is shown. How can I fix?

2 Answers2