set shape background to transparent in android

Question

I have a shape drawable that I want to use as a background. I want the shape to be transparent. But so far it's not. How do I do that? Here is what I have:

<?xml version="1.0" encoding="utf-8"?> <shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:padding="10dp"
    android:shape="rectangle" >

    <solid android:color="#80000000" />

    <stroke
        android:width="1dip"
        android:color="#000000" />

    <corners android:radius="10dp" />

</shape>

I expected the line <solid android:color="#80000000" /> to do the trick.

EDIT:

In manifest, I set android:theme="@android:style/Theme.Dialog". Could that be the cause of the problem? I am basically trying to get this view on top of another. Changing to 00 or FF or whatever else does not work.

Do you want the alpha value to be 80? Is that intentional? Or did you want it to have zero opacity, 00? — Flynn81, Jul 03 '13 at 22:56

score 21 · Answer 1 · answered Jul 03 '13 at 23:02

21

if you want set shape background to transparent you need to set this color

<solid android:color="#00000000" />

answered Jul 03 '13 at 23:02

Volodymyr Yatsykiv

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score 11 · Answer 2 · edited May 23 '17 at 11:48

for creating a color including an opacity effect, you can create a color with taking the alpha channel into account.

<resources>
<color name="translucent_grey">#88cccccc</color>
</resources>

a quote from another User about the color formats:

When defining the color of a view in android, the format can be either #RRGGBB or #AARRGGBB, where AA is the hex alpha value. FF would be fully opaque and 00 would be full transparent.

more information about this technique can be found in this thread: How to Set Opacity (Alpha) for View in Android

Regards, Jim

score 7 · Answer 3 · answered Jun 11 '16 at 06:27

7

You can use this :

<solid
    android:color="@android:color/transparent"/>

This is working for me.

answered Jun 11 '16 at 06:27

spd

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score 3 · Answer 4 · edited May 23 '17 at 12:00

3

I found the answer. Direct quote:

The easiest way that I have found is to set the activity's theme in the AndroidManifest to android:theme="@android:style/Theme.Holo.Dialog" then in the activity's onCreate method call getWindow().setBackgroundDrawable(new ColorDrawable(0));

from @DrewLeonce in Android: how to create a transparent dialog-themed activity

edited May 23 '17 at 12:00

Community

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answered Jul 03 '13 at 23:19

Cote Mounyo

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set shape background to transparent in android

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