Android - How to Set Background Color of All Screens

Android - how to set background color of all screens?

A quick and easy way to make sure every activity has the same background color, is to create a theme for your activities to use. That theme would specify the android:windowBackground.

First define the color in values/colors.xml

<resources>
    <color name="background">#FF0000 </color>
</resources>

Create a themes.xml file in res/values that references that color:

<resources>
 <style name="MyTheme" parent="@android:style/Theme.Light"> 
  <item name="android:windowBackground">@color/background</item>
 </style>
</resources>

... and then in your AndroidManifest.xml specify this as the theme for your activities to use.

 <activity
        android:name=".MyActivity"
        android:theme="@style/MyTheme" />

How to change background color in android app

You need to use the android:background property , eg

android:background="@color/white"

Also you need to add a value for white in the strings.xml

<color name="white">#FFFFFF</color>

Edit : 18th Nov 2012

The first two letters of an 8 letter color code provide the alpha value, if you are using the html 6 letter color notation the color is opaque.

Eg :

How to set background color of a View

You made your button transparent. The first byte is the alpha.

Try v.setBackgroundColor(0xFF00FF00);

How to set background color of an Activity to white programmatically?

Get a handle to the root layout used, then set the background color on that. The root layout is whatever you called setContentView with.

 setContentView(R.layout.main);

  // Now get a handle to any View contained 
  // within the main layout you are using
  View someView = findViewById(R.id.randomViewInMainLayout);

  // Find the root view
  View root = someView.getRootView();

  // Set the color
  root.setBackgroundColor(getResources().getColor(android.R.color.red));

Android find default background color

What you are seeing is actually the background of the activity, not the recyclerview, which is transparent by default. The color did change a view time per Android version.

You can override this in your app theme.

First define the color in values/colors.xml

 <resources>
     <color name="background">#FF0000 </color> 
 </resources> 

Create a themes.xml file in res/values that references that color:

<resources>  
    <style name="MyTheme" parent="@android:style/Theme.Light">       
        <item name="android:windowBackground">@color/background</item>  
    </style> 
</resources> 

and then in your AndroidManifest.xml specify this as
the theme for your activities to use.

 <activity
        android:name=".MyActivity"
        android:theme="@style/MyTheme" />

see https://stackoverflow.com/a/10157077/4623782

Set background color for the whole app. Android, Jetpack Compose

You can place your app inside a Box with needed background:

setContent {
    YourTheme {
        Box(
            modifier = Modifier
                .fillMaxSize()
                .background(Color.Yellow)
        ) {
            YourApp()
        }
    }
}

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