Develop Reference

how to hide the status bar from all layouts?

I want to hide the statusbar from all layouts on click of button.That button i have define in setting layout. But on click of hide button the status bar of current layout is getting hide but on other layout is unaffected.So let me know how to implement it on all the layouts of mu app.

Create a superclass for all Activities, call it something like BaseActivity or AbstractActivity and make each activity extend this class
In the onCreate, before setContentView, read from a database like SharedPreferences whether the status bar should be hidden. If so, then hide it.
In your Settings activity, call recreate() so that each onCreate from the previous activities are called again.

It actually depends on the version of android you are using. For example in Android 4.0 and lower you can achieve it by doing:
<application
...
android:theme="#android:style/Theme.Holo.NoActionBar.Fullscreen" >
...
</application>
For full documentation go to: https://developer.android.com/training/system-ui/status
Edit: What would be better for your button is this code:
void HideStatusBar() {
View decorView = getWindow().getDecorView();
// Hide the status bar.
int uiOptions = View.SYSTEM_UI_FLAG_FULLSCREEN;
decorView.setSystemUiVisibility(uiOptions);
// Remember that you should never show the action bar if the
// status bar is hidden, so hide that too if necessary.
ActionBar actionBar = getActionBar();
actionBar.hide();
}
So, when the user clicks the button call this function. Remember this also hides the action bar or toolbar, so if you don't want that remove the actionbar.hide() part. It's nice, but unfortunately, it only works on Android 4.1 and higher, so if you are supporting lower versions too better look at the documentation for clues. Hope it helps!

Android App FullScreen

I'm a beginner android developer and one of the problems that I am facing is how to make my application full screen.
I have used the:
"android:theme=”#android:style/Theme.NoTitleBar.Fullscreen"
But it actually just removes the status and the action bar, but it keeps the navigation bar.
I tried various different methods without any success, but I know that it's possible since I have lots of apps the do not show the navigation bar like Subway Surfers.
Which is the right way to make it?

Add the following code to your activity:
public class YourActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.your_layout);
...
}
}
p.s.:
Add the following to your onResume() method:
int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
| View.SYSTEM_UI_FLAG_FULLSCREEN;
View decorView = getWindow().getDecorView();
decorView.setSystemUiVisibility(uiOptions);
Note that it is not possible to remove the navigation bar in all cases (see docs: "it does not hide the system bar on tablets"). Starting from 4.4 on you could enable Immersive Mode. Check out this post related to Android 3.0 devices ("You cannot hide the system bar on Android 3.0.").

// Erase the title bar
requestWindowFeature(Window.FEATURE_NO_TITLE);
// Make it full Screen
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(int windowConstVal) is a method to call on Activity and always you to use a Constant from the Window class that applies a variety of additional features to the window.
getWindow().addFlags() Get the window reference from the current activity and add flags (more features) use a Constant from the windowManager class.

You could create a SurfaceView, but it depends on what you want to do if it is useful or not. If you want to make a game, it would probably be useful, but since you might want to use things like Buttons or labels, you can either hide it like described in other answers, or use it (since it gives you an optionMenu with it).
in the end it comes down to what you want to do

In your Manifest, you add this line, but you add in between the activity tags that are already there.
Here is the line: android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
This should be working,there is no reason not to,I am sure of that since I recently used this.

How to hide the actionbar ? (Sherlock Implementation)

I have a typical case where I have used SherlockActionBar for horizontal scrolling. I want the title bar**(one where it depicts the android default icon and app name)** in my activity to disappear. To be more clear, I do not want the bar that is present at the top of the screen but I use a action bar next to it for navigation which is vital. How do I make the top one disappear ? Any ideas will be highly appreciated. An example image is given below :
I hope the question is clear. Feel free to ask for more.

to hide programmatically AB/ABS you can use
getSupportActionBar().hide();

if you are not using support libraries
getActionBar().hide();
otherwise
getSupportActionBar().hide();
NOTE: if your activity extends SherlockFragmentActivity then only the getSupportActionBar().hide(); method will be visible otherwise you will get only getActionBar().hide(); that works with minimum API level 11.

if you are using Action bar (API Level>11)
getActionBar().hide();
or if you are using actionbar sherelock lib (API Level <11)
getSupportActionBar().hide();

Credits goes to blackbelt(answer was delvered via comments) :
getSupportActionBar().setDisplayShowHomeEnabled(false); getSupportActionBar().setDisplayShowTitleEnabled(false);
Calling these functions would remove the title bar. This removed my title bar but the action bar was safe and sound. Thanks to blackbelt.

How to hide the Status Bar?

I am trying to hide the status bar. I have tried the following things.
android:theme="#android:style/Theme.NoTitleBar.Fullscreen" >
In the Manifest.XML I have added the above code.
And in the onCreate() I have added the following:
requestWindowFeature(Window.FEATURE_NO_TITLE);
// hide statusbar of Android
// could also be done later
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
But still I am unable to hide the status bar. Can anyone help?

The approaches you've taken would work on 2.3.X
But if you are talking about 4.0 tablets this is the code
LinearLayout layout = (LinearLayout)findViewById(R.id.layout);
layout.setSystemUiVisibility(View.SYSTEM_UI_FLAG_HIDE_NAVIGATION);
If you're talking about a tablet you cannot get rid of the system bar but I suggest you look at this question:
Hide Status bar on Android Ice Cream Sandwich

Just make sure that you are writing above code lines before the line setContentView()?

android how to hide the status bar without hiding the title bar

In my application i am working with canvas. I am drawing on canvas. I put canvas color as white. When my app open the canvas is visible along with above status bar.
But i want my canvas should take the full screen. means that Notification status bar should disapear when i run that app bt not the title bar(bcz i m using some custom title bar)
How can i do that?
By using below code i gave custom title,
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title);
Now i am trying to hide status bar using below code in activity-
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
and in AndroidManifest.xml
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
But it shows force close.
Give me a way how to do that?

It's enough to remove the line
requestWindowFeature(Window.FEATURE_NO_TITLE);
But if you want to display full screen (without action bar) write too
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_location_eb);

You can't use Window.FEATURE_CUSTOM_TITLE after setting Theme.NoTitleBar. It's enough to use just this theme. Do not set all these flags in code.
EDIT: Seems I misunderstood your question. I read it again carefully and now I see you're asking about Android 2.x and its notification bar. Your onCreate() method should look like this:
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
setContentView(R.layout.name);
getWindow().setFeatureInt(Window.FEATURE_CUSTOM_TITLE, R.layout.custom_title);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
}
You mustn't set Theme.NoTitleBar or Theme.NoTitleBar.Fullscreen for this activity. Just use the default Theme or don't specify any theme at all.

Am going to tell you how to tackle the title bar and the system notification panel individually and perfectly.
Use one or both as per Your Need.
1.Do not apply any theme to the Activity through XML.
2.Now, go the corr. Java file and add these lines
inside onCreate()..
after super.onCreate()..
Part.a. to remove just Title Bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
Part.b. to remove the System notification panel
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
Do not forget to follow them with the usual
setContentView(R.layout.activity_layout_name);