Android Programming 3

Fragments

Transcript

1. Android Programming Fragments
2. Let’s do it for Tablet! Android Programming
3. How can I use Fragments? ›  Include android-support-v4.jar ›  (RightClick on your project, Android Tools-> Add Support Library) ›  Extend Fragment (has same methods of Activity plus someone else) ›  Create a FragmentActivity (with a particular xml) to host your Fragment. ›  Register your FragmentActivity in Manifest Android Programming
4. Host FragmentActivity layout <?xml version="1.0" encoding="utf-8"?>! <fragment xmlns:android=" http://schemas.android.com/apk/res/android"! android:id="@+id/list_fragment”! "android:name=” com.example.fragmentsexample.MyListFragment"! android:layout_width=”wrap_content"! android:layout_height=”wrap_content"! android:layout_weight="0.5" >! </fragment>! Android Programming
5. Fragment’s only methods @Override public void onAttach(Activity activity) { //when activity host this fragment } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstance) //called when this fragment was first created View v = inflater.inflate(R.layout.test, container); return v; } //Some other methods //All Activity methods Android Programming
6. Make it double! ›  Create a directory named “layout- land” in res folder. ›  Place a layout inside this folder with 2 fragments So that simple! Android Programming
7. Android Programming
8. double_layout.xml <?xml version="1.0" encoding="utf-8"?>! <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"! android:orientation="horizontal" android:layout_width="fill_parent"! android:layout_height="fill_parent" >! ! <fragment! android:id="@+id/list_fragment"! android:name="com.example.fragmentsexample.MyListFragment"! android:layout_width="match_parent"! android:layout_height="match_parent"! android:layout_weight="0.5" >! </fragment>! ! <fragment! android:id="@+id/view_fragment"! android:name="com.example.fragmentsexample.ViewFragment"! android:layout_width="match_parent"! android:layout_height="match_parent"! android:layout_weight="0.5" >! </fragment>! ! </LinearLayout> Android Programming
9. What should we do today? Android Programming
10. How can I communicate with the other fragment? ›  Create a listener (interface) to respond when a user tap on Item ›  host activity of the left fragment should implements that interface ›  Left fragment should contain a list (maybe a ListFragment? ;-) ) that use that interface ›  Create a method on the right fragment to update the content =) Android Programming
11. Wait… how can I know if the right fragment is visible? RightFragment viewer =(RightFragment) getSupportFragmentManager(). findFragmentById( R.id.view_fragment); if(viewer!=null && viewer.isVisible()) { doTheJob(); } Android Programming
12. Credits: ›  Let’s do it for tablet image ›  Are your kidding me image Android Programming