hide title bar android

1@Override
2protected void onCreate(Bundle savedInstanceState) {
3    super.onCreate(savedInstanceState);
4
5    try
6    {
7        this.getSupportActionBar().hide();
8    }
9    catch (NullPointerException e){}
10
11    setContentView(R.layout.activity_main);
12}

1<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar" />

1getSupportActionBar().hide();
2

1requestWindowFeature(Window.FEATURE_NO_TITLE);
2getSupportActionBar().hide();
3this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,  
4               			  WindowManager.LayoutParams.FLAG_FULLSCREEN);
5setContentView(R.layout.activity_main);  

1change
2<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
3to
4<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

1getSupportActionBar().hide();