Android Fragment De Bases Tutoriel

Et donc je suis coincé sur la troisième tutoriel sur la Développeur Android Site sur les Fragments pour quelques jours. Je ne peux pas comprendre comment l'application remplit les données quand je lance l'application sur une tablette grand écran de mise en page). Je peux comprendre comment les données sont transmises sur un petit écran (l'écran du téléphone).

Comment le plus grand écran de la liste de remplir avec les données?

Voici un lien de l'ensemble du projet de Android.com tutoriels.

Classe MainActivity

public class MainActivity extends FragmentActivity 
implements HeadlinesFragment.OnHeadlineSelectedListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//Here, the system will decide which news_article layout it will use based on the screen size. Will use layout if small or layout-large if it's big. 
setContentView(R.layout.news_articles);
//Check whether the activity is using the layout version with
//the fragment_container FrameLayout. If so, we must add the first fragment
//This check is to determine which layout to be used, either small screen or big screen.
//fragment_container used FrameLayout for small screens.
//fragment_container is the id of FrameLayout in news_article for small screen. 
if (findViewById(R.id.fragment_container) != null) {
//However, if we're being restored from a previous state,
//then we don't need to do anything and should return or else
//we could end up with overlapping fragments.
if (savedInstanceState != null) {
return;
}
//Create an instance of ExampleFragment
HeadlinesFragment firstFragment = new HeadlinesFragment();
//In case this activity was started with special instructions from an Intent,
//pass the Intent's extras to the fragment as arguments
firstFragment.setArguments(getIntent().getExtras());
//Add the fragment to the 'fragment_container' FrameLayout
getSupportFragmentManager().beginTransaction()
.add(R.id.fragment_container, firstFragment).commit();
}
}
public void onArticleSelected(int position) {
//The user selected the headline of an article from the HeadlinesFragment
//Capture the article fragment from the activity layout
ArticleFragment articleFrag = (ArticleFragment)
getSupportFragmentManager().findFragmentById(R.id.article_fragment);
if (articleFrag != null) {
//If article frag is available, we're in two-pane layout...
//Call a method in the ArticleFragment to update its content
articleFrag.updateArticleView(position);
} else {
//If the frag is not available, we're in the one-pane layout and must swap frags...
//Create fragment and give it an argument for the selected article
ArticleFragment newFragment = new ArticleFragment();
Bundle args = new Bundle();
args.putInt(ArticleFragment.ARG_POSITION, position);
newFragment.setArguments(args);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
//Replace whatever is in the fragment_container view with this fragment,
//and add the transaction to the back stack so the user can navigate back
transaction.replace(R.id.fragment_container, newFragment);
transaction.addToBackStack(null);
//Commit the transaction
transaction.commit();
}
}
}

HeadLineFragment

public class HeadlinesFragment extends ListFragment {
//The container Activity must implement this interface so the frag can deliver messages
public interface OnHeadlineSelectedListener {
/** Called by HeadlinesFragment when a list item is selected */
public void onArticleSelected(int position);
}
OnHeadlineSelectedListener mCallback;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//We need to use a different list item layout for devices older than Honeycomb
int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
//Create an array adapter for the list view, using the Ipsum headlines array
setListAdapter(new ArrayAdapter<String>(getActivity(), layout, Ipsum.Headlines));
}
@Override
public void onStart() {
super.onStart();
//When in two-pane layout, set the listview to highlight the selected list item
//(We do this during onStart because at the point the listview is available.)
if (getFragmentManager().findFragmentById(R.id.article_fragment) != null) {
getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
}
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
//This makes sure that the container activity has implemented
//the callback interface. If not, it throws an exception.
try {
mCallback = (OnHeadlineSelectedListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
//Notify the parent activity of selected item
mCallback.onArticleSelected(position);
//Set the item as checked to be highlighted when in two-pane layout
getListView().setItemChecked(position, true);
}
}

Disposition pour le petit écran
news_article.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />

Disposition pour bigscreen
news_article.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<fragment android:name="com.example.android.fragments.HeadlinesFragment"
android:id="@+id/headlines_fragment"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment android:name="com.example.android.fragments.ArticleFragment"
android:id="@+id/article_fragment"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
vous pouvez trouver ce lien utile vogella.com/articles/AndroidFragments/article.html
Qu'est-ce que le HeadLinesFragment que vous utilisez?

OriginalL'auteur W J | 2013-03-20