Develop Reference

Unwanted Title bar android

I want to remove this unwanted title bar
I cant remove this
i have tried
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
this.getWindow().setFlags(
WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);

This is not a title bar. This is ActionBar or Toolbar. You should extend your application theme from Theme.AppCompat.NoActionBar. Or just add android:theme="#style/Theme.AppCompat.NoActionBar" to <application/> tag in AndroidManifest.xml

add the following to your manifest:
android:theme="#android:style/Theme.NoTitleBar.Fullscreen"
That should sort it, replace Theme with your actual theme if required, this line goes within the application part of the manifest or can go where the activity is declared.

You need to set your content view AFTER you have written the two lines
//Remove title bar
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
//Remove notification bar
this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
//set content view AFTER ABOVE sequence (to avoid crash)
this.setContentView(R.layout.layout_name);

Android how to hide status bar without ActionBar

is it possible to hide status bar:
And show action bar without it?

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

Another way .In your manifest xml, at application level set this:
<activity
android:theme="#android:style/Theme.NoTitleBar.Fullscreen" />
I hope it will works

getActionBar returns null - how to have NoTitleBar

So I have this under my Activity's onCreateView()
ActionBar actionBar = getActionBar();
actionBar.setDisplayShowHomeEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE);
And my manifest looks like this
<activity
android:name="com.example.nfcproducttracing.ProductTracer"
android:label="#string/app_name"
android:theme="#android:style/Theme.Holo.Light"
android:launchMode="singleTask">
What I have achieved is have my application with Tabs, but no TitleBar. However, during application launch I can briefly see the TitleBar before it disappears, and I do not want that.
What am I supposed to do? When I set my activity theme to anything related to NoTitle, getActionBar returns null and the app crashes.

If I understand correctly your questions, you can use the requestWindowFeature(Window.FEATURE_NO_TITLE) from your activity.
Flag for the "no title" feature, turning off the title at the top of the screen.

Not really sure but have you tried this:
getActionBar().setTitle("");
It will set a blank title for your ActionBar.

You can try using getSupportActionBar() instead.
this is from android.support.v4.app.actionbar, not from android.app.actionbar!

Android: How to set icon in title bar of Dialog activity?

I declared a dialog activity in my Manifest as follows:
<activity android:name=".myDialog"
android:label="#string/title_dlg"
android:icon="#android:drawable/ic_dialog_alert"
android:exported="false"
android:excludeFromRecents="true"
android:theme="#android:style/Theme.Dialog">
However, only the title's text appears in the title bar and the icon appears to be ignored.
Is there a way to also show the icon in the title bar?

Use this after your super.onCreate(savedInstanceState); call:
requestWindowFeature(Window.FEATURE_LEFT_ICON);
Then, set your contentView(R.layout.youLayout);
and then use this:
getWindow().setFeatureDrawableResource(Window.FEATURE_LEFT_ICON, android.R.drawable.ic_dialog_alert);
The order is important.

I think using below line after super call will work
requestWindowFeature(Window.FEATURE_CUSTOM_TITLE);
Keep in mind to place it before setting content view

REMOVE upper Border layout

I have develop app in which I set layout 480 * 320, it is starting from top. But my problem is there is one in build border are display when we take a new project and it is display in all activity. So I want to disable it.
Border like
So can you tell how can I remove it or hide it?

I think what you are trying to do is hide the TitleBar of the application. You can do that by changing the application theme.
Add android:theme="#android:style/Theme.Light.NoTitleBar" in the <application> tag of your manifest file.
Any theme with .NoTitleBar should do the trick.

use any one.
Manifest:
android:theme="#android:style/Theme.NoTitleBar"
Or
java:
requestWindowFeature(Window.FEATURE_NO_TITLE);

requestFeature(FEATURE_NO_TITLE);
in you activity's onCreate before setting the layout should remove it.

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