How to hide the title bar for an Activity in XML with existing custom theme

Question

I want to hide the titlebar for some of my activities. The problem is that I applied a style to all my activities, therefore I can\'t simply set the theme to @android:

Answer 1

To Hide both Title and Action bar I did this:

In activity tag of Manifest:

android:theme="@style/AppTheme.NoActionBar"

In Activity.java before setContentView:

this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

i.e.,

//Remove title bar

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

//Remove notification bar

this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

NOTE: You need to keep these lines before setContentView