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“Fragments are two or more activities on the screen at the same time”.
In this blog, We have shown the how to use fragments rather than using a lot of activities.
If in your app there is hardly two to three layouts contents than you can easily use activities. But if you have a lot of content in your app to show means 20 to 25 layouts or more than this, than from my opinion you can use Fragments.
We can also see activities being used as a way to add logical flow to an application.
A Fragment is a piece of an application’s user interface or behavior that can be placed in an Activity. Interaction with fragments is done through FragmentManager, which can be obtained via
The core series of lifecycle methods that are called to bring a fragment up to resumed state (interacting with the user) are:
onAttach(Activity)
onCreate(Bundle)
onCreateView(LayoutInflater, ViewGroup, Bundle)
onActivityCreated(Bundle)
Activity.onCreate()
onViewStateRestored(Bundle)
onStart()
onResume()
As a fragment is no longer being used, it goes through a reverse series of callbacks:
onPause()
onStop()
onDestroyView()
onDestroy()
onDetach()
In this tut, we have made a simple fragment and how to attach that fragment to an activity.
First of all, if you are using android studio for development, then create a blank fragment by following steps:-
Then it gives a black fragment and a layout
Let us the name of the fragment black fragment is DemoFragment.java and fragment_demo.xml
fragment_demo.xml
There is a TextView inside FrameLayout. FrameLayout is a layout which is used to hold a single child view.
Why is FrameLayout always USED with Fragments? We can basically use RelativeLayout or LinearLayout it will still work. But FrameLayout is designed to block out an area on the screen to display a single item.
Why is FrameLayout always USED with Fragments?
We can basically use RelativeLayout or LinearLayout it will still work. But FrameLayout is designed to block out an area on the screen to display a single item.
You can read more about FrameLayout here: About FrameLayout
DemoFragment.java
If you want to access our fragment’s view then
in your onCreateView(),
create an view named fragmentView and assign the Inflated view to fragmentView.
By fragmentView, you can access your fragment’s Views.
In this example, I have a MainActivity.java. And a button on that. On press of a button, we will open our demoFragment.java.
activity_main.xml
MainActivity.java
We can see in above code when attachFragment button is clicked. then DemoFragment adds to the fragment_container. by following code snipped:
And if you want, on the press of the back button the previous container has loaded. Then set
and override onBackPressed()
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