basically this is my app(idea) for a tablet landscape orientation: Two Fragments, left fragment is a listfragment populated by a resource.xml file (Got that working).
Right fragment is supposed to dynamically change fragment and layout based on which list item the user clicks. Googling so far told me that I need to programmatically add and remove fragments to a viewgroup to do that. Is that right?
Basically the question is/are:
EDIT:
So this is what my activity looks like: Main.java
public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
This is my listfragment MenuFragment.java
public class MenuFragment extends ListFragment {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.listfragment, container, false);
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setListAdapter(new ArrayAdapter<String>(getActivity(),
android.R.layout.simple_list_item_1,
getResources().getStringArray(R.array.listmenu)));
}
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
Main activity = (Main) getActivity();
}
}
and finally my main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<fragment
android:id="@+id/list"
android:layout_width="200dp"
android:layout_height="fill_parent"
android:layout_alignParentTop="true"
android:layout_weight="1"
class="com.mwerner.fragmentstest.MainMenu" />
<View
android:id="@+id/contentview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toRightOf="@+id/list" />
</RelativeLayout>
The string array I have in my xml file that populates the list is called "listmenu"
Please tell me where I need to put in the code you wrote down?
Take a look at these Fragment topics:
Essentially you'll want to have the left fragment tell the parent Activity which item is selected. Then, the Activity can add/remove the correct fragment in the right pane.
Keep in mind that creating/destroying a Fragment is a lot of work for the system. If you can get away with having a single Fragment in the right pane, it will be much more efficient. You can then call methods on that one Fragment instance without building new Fragments.
EDIT (example):
Your Main Activity implementation with custom method:
public class Main extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
/** Called by the left fragment */
public void updateRightPane(long id) {
// Get the data with the selected item id
// ...
// Create a new fragment
MyFragment fragment = new MyFragment(data);
// Update the layout
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
// The id specified here identifies which ViewGroup to
// append the Fragment to.
ft.add(R.id.view_group_id, fragment);
ft.commit();
}
}
The onListItemClick
implementation for MenuFragment.java
:
@Override
public void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
// Get the parent Activity
Main activity = (Main) getActivity();
// Pass the selected item id to the Activity method
// Note: Feel free to update this method to accept additional
// arguments (e.g. position).
activity.updateRightPane(id);
}
Finally, your layout file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/view_group_id"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<!-- More views here... -->
</RelativeLayout>