[android] How do I create a transparent Activity on Android?

If you are using AppCompatActivity then add this in styles.xml

<style name="TransparentCompat" parent="@style/Theme.AppCompat.Light.DarkActionBar">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
    <item name="android:windowIsTranslucent">true</item>
    <item name="android:windowAnimationStyle">@android:style/Animation</item>
</style>

In manifest file you can add this theme to activity tag like this

android:theme="@style/TransparentCompat"

for more details read this article

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