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In my application I have a lot of layers and instead of setting a background image to each of them, I want to set a background once and for all. How can I do that?
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Add a android:theme="@style/Theme. AppTheme attribute to your application tag in the manifest file with the theme you want to use. This will prevent the default "black" background to be drawn if you only set a background in your Activity/Fragment layout file. You declared it in a style.
In order to make Android allow apps to run in background, all you need to do is press the open padlock icon right next to them. Once the open padlock changes and you get the “Locked” pop-up notification on your screen, you're all set!
To open it go to Tools -> Android -> Theme Editor.
In the Project pane select Android, go to app > res > values > themes > themes.
Take a look at Apply a theme to an Activity or application to apply the background image across the whole application.
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