How to Set Transparency of a Background Image Android Xml File

How to change opacity of background image?

Try This

View backgroundimage = findViewById(R.id.background);
Drawable background = backgroundimage.getBackground();
background.setAlpha(80);

here backgroundimage is for your understanding you can replace your layout which background you want to set opacity

Set transparent background of an imageview on Android

In your XML set the Background attribute to any colour, White(#FFFFFF) shade or Black(#000000) shade. If you want transparency, just put 80 before the actual hash code:

#80000000

This will change any colour you want to a transparent one.. :)

modify the transparency of a background image in android xml

An XML example would look like

<ImageView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/myimage"
    android:alpha=".75"/>

Programatically, you can also set it with

int alphaAmount = 125; // some value 0-255 where 0 is fully transparent and 255 is fully opaque
myImage.setAlpha(alphaAmount);

where myImage is an ImageView.

How to make a background image transparent in the activity?

try this for transparent background:

in the file AndroidManifest.xml

<activity android:name="YourActivity" android:theme="@style/TransparentStyle"></activity>

in the file /res/values/style.xml

<resources>
  <style name="TransparentStyle">
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowAnimationStyle">@android:style/Animation.Translucent</item>
    <item name ="android:windowBackground">#00000000</item>
    <item name="android:windowNoTitle">true</item>
    <item name="android:colorForeground">#ffffff</item>
  </style>
</resources>

and try this for transparent image:

<ImageView
  android:layout_width="wrap_content"
  android:layout_height="wrap_content"
  android:src="@drawable/yourImage"
  android:alpha=".75"/>

How to make a background 20% transparent on Android

Make the color have 80% in the alpha channel. For example, for red use #CCFF0000:

<TextView
   ...
   android:background="#CCFF0000" />

In the example, CC is the hexadecimal number for 255 * 0.8 = 204. Note that the first two hexadecimal digits are for the alpha channel. The format is #AARRGGBB, where AA is the alpha channel, RR is the red channel, GG is the green channel and BB is the blue channel.

I'm assuming that 20% transparent means 80% opaque. If you meant the other way, instead of CC use 33 which is the hexadecimal for 255 * 0.2 = 51.

In order to calculate the proper value for an alpha transparency value you can follow this procedure:

1. Given a transparency percentage, for example 20%, you know the opaque percentage value is 80% (this is 100-20=80)
2. The range for the alpha channel is 8 bits (2^8=256), meaning the range goes from 0 to 255.
3. Project the opaque percentage into the alpha range, that is, multiply the range (255) by the percentage. In this example 255 * 0.8 = 204. Round to the nearest integer if needed.
4. Convert the value obtained in 3., which is in base 10, to hexadecimal (base 16). You can use Google for this or any calculator. Using Google, type "204 to hexa" and it will give you the hexadecimal value. In this case it is 0xCC.
5. Prepend the value obtained in 4. to the desired color. For example, for red, which is FF0000, you will have CCFF0000.

You can take a look at the Android documentation for colors.

Opacity on a background Drawable image in View (using XML Layout)

I ended up just going with the programmatical solution, since it doesn't look like it can be done via the XML layouts.

Drawable rightArrow = getResources().getDrawable(R.drawable.green_arrow_right_small);

// setting the opacity (alpha)
rightArrow.setAlpha(10);

// setting the images on the ImageViews
rightImage.setImageDrawable(rightArrow);

How to make android layout background transparent?

Try to give this on your item CardView

 app:cardBackgroundColor="@android:color/transparent"

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