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
.NoTitleBarshould do the trick.