All the adjustments to get a completely transparent statusbar

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First, edit the themes. This is an example to use for your Activity in the default styles.xml:

<style name="Theme.Transparent">
    <item name="android:windowTranslucentNavigation">true</item>
    <item name="android:windowTranslucentStatus">true</item>
</style>

and this is the values-v21/styles.xml version:

<style name="Theme.Transparent">
    <item name="android:windowDrawsSystemBarBackgrounds">true</item>
    <item name="android:windowTranslucentNavigation">true</item>
    <item name="android:windowTranslucentStatus">true</item>
    <item name="android:windowAnimationStyle">@null</item>
    <item name="android:statusBarColor">@android:color/transparent</item>
</style>

Then in the Activity:

class MyActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
            window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS,
                    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)
        }
        super.onCreate(savedInstanceState)
        setContentView(R.layout.my_activity)
        ...
    }

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