Android hides the status bar and title bar, which is equivalent to full screen.

To hide the title bar, use the predefined style android: theme = "@ android: style/Theme. NoTitleBar ".
Hide the status bar: android: theme = "@ android: style/Theme. NoTitleBar. Fullscreen ".
[XML] Code:
1. view sourceprint? 01 <? Xml version = "1.0" encoding = "UTF-8"?>
2.
3. <manifest xmlns: android = "http://schemas.android.com/apk/res/android"
4.
5. package = "de. vogella. android. temperature"
6.
7. android: versionCode = "1"
8.
9. android: versionName = "1.0" type = "codeph" text = "/codeph">
10.
11. <application android: icon = "@ drawable/icon" android: label = "@ string/app_name">
12.
13. <activity android: name = ". Convert"
14.
15. android: label = "@ string/app_name"
16.
17. android: theme = "@ android: style/Theme. NoTitleBar. Fullscreen">
18.
19. <intent-filter>
20.
21. <action android: name = "android. intent. action. MAIN"/>
22.
23. <category android: name = "android. intent. category. LAUNCHER"/>
24.
25. </intent-filter>
26.
27. </activity>
28.
29. </application>
30.
31. <uses-sdk android: minSdkVersion = "9"/>
32.
33. </manifest>
34.
[Java] Code:
1. public void onCreate (Bundle savedInstanceState ){
2.
3. super. onCreate (savedInstanceState );
4.
5. // hide titlebar of application
6.
7. // must be before setting the layout
8.
9. requestWindowFeature (Window. FEATURE_NO_TITLE );
10.
11. // hide statusbar of Android
12.
13. // cocould also be done later
14.
15. getWindow (). setFlags (WindowManager. LayoutParams. FLAG_FULLSCREEN,
16. WindowManager. LayoutParams. FLAG_FULLSCREEN );
17.
18. setContentView (R. layout. main );
19.
20. text = (EditText) findViewById (R. id. EditText01 );
21.
22 .}

The author is "life-threatening"