How to set transparency of a background image Android xml file

Question

I have put an image in as the background of my android application with the following line of code:

 android:background=\"@drawable/background\"

Answer 1

You can set the alpha property:

android:alpha="0.4"

via code :

yourView.setAlpha(0.5f);

only the background :

yourView.getBackground().setAlpha(120);  // here the value is an integer not float

Answer 2

just use this line in your .xml file android:background="#ddxxxxxx" replace the xxxxxx with any color you want. refer https://alvinalexander.com/android/how-background-image-behind-translucent-opaque-textview for more details.

Answer 3

you can create a layer-list resource and set it to background property of your view (layout)

background_image_with_alpha.xml

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item>
        <bitmap
            android:alpha="0.2"
            android:src="@drawable/xxxxxx"
            android:gravity="fill">

        </bitmap>
    </item>

</layer-list >