Change the background color of a pop-up dialog

To expand on @DaneWhite's answer, you don't have to rely on the built-in themes. You can easily supply your own style:

<style name="MyDialogTheme" parent="Theme.AppCompat.Light.Dialog.Alert">    <item name="android:background">@color/myColor</item></style>

and then apply it in the Builder constructor:

Java:

AlertDialog alertDialog = new AlertDialog.Builder(getContext(), R.style.MyDialogTheme)        ...        .create();

Kotlin:

var alertDialog = AlertDialog.Builder(context, R.style.MyDialogTheme)        ...        .create()

This should work whether you are using android.support.v7.app.AlertDialog or android.app.AlertDialog

This also works better than @DummyData's answer because you don't resize the dialog. If you set window's background drawable you overwrite some existing dimensional information and get a dialog that is not standard width.

If you set background on theme and the set the theme on dialog you'll end up with a dialog that is colored how you want but still the correct width.

If you just want a light theme and aren't particular about the specific color, then you can pass a theme id to the AlertDialog.Builder constructor.

AlertDialog.Builder(this, AlertDialog.THEME_HOLO_LIGHT)...

or

AlertDialog.Builder(this, AlertDialog.THEME_DEVICE_DEFAULT_LIGHT)...

Credit goes to Sushil

Create your AlertDialog as usual:

AlertDialog.Builder dialog = new AlertDialog.Builder(getContext());Dialog dialog = dialog.create();dialog.show();

After calling show() on your dialog, set the background color like this:

dialog.getWindow().setBackgroundDrawableResource(android.R.color.background_dark);