how to remove title bar in android / How to hide the title bar for an Activity in XML / Remove Android App Title Bar

1. By XML

You need to modify the style.xml file

Inside values/styles.xml

<style name="Theme.Default" parent="@android:style/Theme"></style>

<style name="Theme.NoTitle" parent="@android:style/Theme.NoTitleBar"></style>

<style name="Theme.FullScreen" parent="@android:style/Theme.NoTitleBar.Fullscreen"></style>

Inside values-v11/styles.xml

<style name="Theme.Default" parent="@android:style/Theme.Holo"></style>

<style name="Theme.NoTitle" parent="@android:style/Theme.Holo.NoActionBar"></style>

<style name="Theme.FullScreen" parent="@android:style/Theme.Holo.NoActionBar.Fullscreen"></style>

Inside values-v14/styles.xml

<style name="Theme.Default" parent="@android:style/Theme.Holo.Light"></style>

<style name="Theme.NoTitle" parent="@android:style/Theme.Holo.Light.NoActionBar"></style>

<style name="Theme.FullScreen" parent="@android:style/Theme.Holo.Light.NoActionBar.Fullscreen"></style>

In the application tag of the Manifest file I have added an attribute of:

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

2. By Coding

You can archive the same via coding. Here is a corresponding snippet

@Override

public void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    // hide titlebar of application

    // must be before setting the layout

    requestWindowFeature(Window.FEATURE_NO_TITLE);

    // hide statusbar of Android

    // could also be done later

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

            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.main);

    text = (EditText) findViewById(R.id.EditText01);

}