android:theme=“@android:style/Theme.NoTitleBar.Fullscreen” works on Application level but not at the activity level. Any clue?

Question

I need to make one of my activities called MyNoStatusBarActivity.java a full-screen activity.

I have added in the Manifest :

Answer 1

I put this in my activity:

requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_splash);

And in my manifest I don't modify, this is mine, without modifications:

android:theme="@style/AppTheme"

In my activty xml:

android:theme="@android:style/Theme.NoTitleBar.Fullscreen"