Android lecture about fragment simple and easy talk

1. Alaa Alsalehi
Serve Me

2. https://play.google.com/store/apps/developer?id=ServeMe

3.  What is fragment?
 Why fragment?
 How to use fragment?
 Lifecycle
 Advanced usages

4.  A Fragment represents a behavior or a
portion of user interface in an Activity.
 Reusable component.
◦ User interface
◦ Background worker

5. Why fragment?

13.  Add to layout file
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="match_parent"
android:layout_height="match_parent">
<fragment android:name="com.example.news.ArticleListFragment"
android:id="@+id/list"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment android:name="com.example.news.ArticleReaderFragment"
android:id="@+id/viewer"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>

14.  Add it dynamically to activity using fragment
manager
FragmentManager fragmentManager =
getFragmentManager();
FragmentTransaction fragmentTransaction =
fragmentManager.beginTransaction();
ExampleFragment fragment = new
ExampleFragment();
fragmentTransaction.add(R.id.fragment_contain
er, fragment);
fragmentTransaction.commit();

15.  Fragment represent sub-activity
 On attach and on detach like view.
 The other callback like activity.

16.  Non UI Fragment
◦ Background worker
 Not a service
 Die when activity die
◦ Cache data
 Backup and restore when configuration change