Develop Reference

Which layout/activity is referred to by the parent parameter in the getView method?

In the getView method in the custom adapter made:
public View getView(int position, View convertView, ViewGroup parent)
Which activity is referred to by the parent parameter?
Is it the xml layout to which the new inflated objects will be added? (The one that has this) :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:id="#+id/rootView"
>
<ListView
android:id="#+id/list"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:textAppearanceLarge"
android:textColor="#4689C8"
android:textStyle="bold" />
</LinearLayout>
or is it the java activity that contains the actual values of the list (as an array) and contains this:
final ListView listView =(ListView)findViewById(R.id.list);
listView.setAdapter(adapter);
I hope I made it clear and please tell me if it is not

cannot show listView on fragment

I have a xml Layout file (ListLayout.xml) where i create listView and i want this layout to be shown on a fragment on main_activity_layout. so go to MainActivity_layout and i added a fragment , when it is proposed to choose a class i choosed the class Listfrg where i return the layout of listLayout.xml within OnCreateView methode , but nothing is shown why ?
ListLayout.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/progress_container_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone" >
<ProgressBar
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<FrameLayout
android:id="#+id/list_container_id"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/empty_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false" >
</ListView>
</FrameLayout>
</FrameLayout>
MainActivityLayout
<fragment
android:layout_width="162dp"
android:layout_height="match_parent"
android:name="com.example.pack2.t9ahbin.Listfrg"
android:id="#+id/fragment3" />
Class Listfrg :
public class Listfrg extends ListFragment{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.frglist, container, false);
return view;
}
}

nothing is shown why?
Because there is no data in your list.
Please use an ArrayAdapter or some Adapter variant, put some data into it with adapter.add, and the use listView.setAdapter. To actually give data to your Listview.
You can do this in onCreateView and use getListView() or this to get the ListView.
ListView listView = (ListView) view.findViewById(android.R.id.list);
An Adapter is the data container for a ListView. Without one, how do you expect to display data?
Also your empty view needs to use android:id="#android:id/empty"
This is all well covered in AdapterViews

Android - Populating a listview using fragments and a Simple cursor adapter

I know that this question is probably asked a hundred times so far, but i still haven't manage to solve my problem. I have one activity that's comprised of 2 fragments. One fragment is a form that adds information to the database:
**R.layout.fragment_add_server:**
<?xml version="1.0" encoding="utf-8"?>
...
<LinearLayout
android:id="#+id/nameLinear"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:layout_marginLeft="5dp" >
<TextView
android:id="#+id/nameText"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="70"
android:text="#string/strName"
android:textAppearance="?android:attr/textAppearanceMedium" />
<EditText
android:id="#+id/editName"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="30"
android:hint="#string/editName" />
</LinearLayout>
...
And another fragment that's just a listview.
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#drawable/georgeback"
android:orientation="vertical" >
<ListView
android:id="#+id/listView1"
android:layout_width="wrap_content"
android:layout_height="0dp"
android:layout_weight="60" >
</ListView>
<Button
android:id="#+id/connect"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:text="#string/connectBTN" />
</LinearLayout>
That fragment, the listview, i want to populate it with whatever there is in the database, and auto refresh when something new is added(haven't got to that stage yet). When i'm using the following code below i manage to populate the listview with the entire fragment(i.e i see the listboxes,buttons etc and i can even interact with them. Inception.) instead of just the data.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_select_server,
container, false);
Cursor mNotesCursor = mDbHelper.fetchAllNotes();
String[] from = new String[]{mDbHelper.KEY_TITLE};
int[] to = new int[]{R.id.editName};
mCurAdapter = new SimpleCursorAdapter(view.getContext(),R.layout.fragment_add_server,mNotesCursor,from,to,0);
mMyListView=(ListView)view.findViewById(R.id.listView1);
mMyListView.setAdapter(mCurAdapter);
return view;
}
I believe that i'm doing something wrong with the from and to fields of the constructor. Any idea why i'm getting as an output the entire fragment view and not just the data in the database? Any other suggestions?

Your problem is when you pass the fragment layout instead of the list view item layout. From what I can see your list view item is included inside your fragment_add_server.xml layout (since you put ... before and after the xml snippet). Move the snippet into its own file, something like my_list_view_item.xml and use that when creating your SimpleCursorAdapter.
mCurAdapter = new SimpleCursorAdapter(view.getContext(),R.layout.my_list_view_item,mNotesCursor,from,to,0);

I solved the problem i had by changing the layout in the simplecursoradapter. Instead of
mCurAdapter = new SimpleCursorAdapter(view.getContext(),R.layout.fragment_add_server,mNotesCursor,from,to,0);
i did:
mCurAdapter = new SimpleCursorAdapter(view.getContext(),android.R.layout.simple_list_item_1,mNotesCursor,from,to,0);
Essentially changing the layout to the generic android list layout did the trick! :)

ListView with custom adapter and other view elements

I am learning to use the Hierarch Viewer tool, but meanwhile any hint on why below layout is not rendering correctly is appreciated.
I am trying to render an "html" table view. The content (table body) is rendered correctly with a custom list adapter. This works. But, when I add a textView (text_test below) to use as header, the list is not rendered anymore. I could see the code flow through my adapter (populate view holder, etc), but on screen I only see the Title text, no listView. I used to use FrameLayout (as noted in the comment), but then switched to LinearLayout.
Thanks.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.my_list_view, container,
false);
ListView lv = (ListView)view.findViewById(R.id.my_list_view_one);
// Tell the list view which view to display when the list is empty
//lv.setEmptyView(getActivity().findViewById(R.id.my_list_view_empty));
// Set up the adapter
mCustomAdapter = new ListAdapterMyType(inflater, new ArrayList<MyType>());
lv.setAdapter(mCustomAdapter);
return view;
}
my_list_view.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- The frame layout is here since we will be showing either
the empty view or the list view. -->
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/text_test"/>
<ListView
android:id="#+id/my_list_view_one"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"/>
<!-- Here is the view to show if the list is emtpy -->
<TextView android:id="#+id/my_list_view_empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/list_no_items"
android:visibility="gone"/>
</LinearLayout>
</LinearLayout>

But, when I add a textView (text_test below) to use as header, the list is not rendered anymore.
The TextView is set to match_parent in both the width and height, so it will fill the entire screen... To put a TextView above your ListView try:
<LinearLayout
android:layout_width="match_parent"
android:layout_height="0dip"
android:orientation="vertical">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/text_test"/>
<ListView
android:id="#+id/my_list_view_one"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false"/>
<!-- Here is the view to show if the list is emtpy -->
<TextView android:id="#+id/my_list_view_empty"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/list_no_items"
android:visibility="gone"/>
</LinearLayout>
I removed the outer LinearLayout, since it only had one child it did nothing. I also changed the remaining LinearLayout's orientation to vertical and set the header TextView height to wrap_content.
If you want your custom header to scroll with your ListView, use the addHeaderView() method (before calling setAdapter()) instead of a separate TextView in your layout. This approach will also hide the header when the ListView is empty.

ListFragment Layout from xml

How to create a ListFragment (of the support v4 library) layout from xml?
ListFragment sets up its layout programmatically, so if you want to modify it, you need to mess with add/remove view.

I've converted the created layout to xml, you can add/remove your widgets or e.g. add pulltorefresh solutions. You shouldn't change the needed ids.
Because of internal ids needed for some of the widgets an helper function needs to be called and it needs to be in support v4 namespace since constants are internal with default visibility.
list_loader.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="#+id/progress_container_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:visibility="gone" >
<ProgressBar
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
<FrameLayout
android:id="#+id/list_container_id"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="#+id/empty_id"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center" />
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:drawSelectorOnTop="false" >
</ListView>
</FrameLayout>
</FrameLayout>
and the class ListFragmentLayout in android.support.v4.app (in your project, you don't need to modify support v4 jar)
package android.support.v4.app;
import your.package.R;
import android.view.View;
public class ListFragmentLayout
{
public static void setupIds(View view)
{
view.findViewById(R.id.empty_id).setId(ListFragment.INTERNAL_EMPTY_ID);
view.findViewById(R.id.progress_container_id).setId(ListFragment.INTERNAL_PROGRESS_CONTAINER_ID);
view.findViewById(R.id.list_container_id).setId(ListFragment.INTERNAL_LIST_CONTAINER_ID);
}
}
in your fragment that extends ListFragment
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
View view = inflater.inflate(R.layout.list_loader, container, false);
ListFragmentLayout.setupIds(view);
return view;
}

From the android sdk (ListFragment) (http://developer.android.com/reference/android/app/ListFragment.html):
public View onCreateView (LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
Provide default implementation to return a simple list view. Subclasses can override to replace with their own layout. If doing so, the returned view hierarchy must have a ListView whose id is android.R.id.list and can optionally have a sibling view id android.R.id.empty that is to be shown when the list is empty.
If you are overriding this method with your own custom content, consider including the standard layout list_content in your layout file, so that you continue to retain all of the standard behavior of ListFragment. In particular, this is currently the only way to have the built-in indeterminant progress state be shown.
So when you want your own layout.xml for a FragmentList overide onCreateView and inflate your own layout.
For example:
Create a android layout (yourlistlayout.xml) and put the following xml on the position where you want to show your ListFragment.
<ListView
android:id="#android:id/list"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true" >
</ListView>
in your ListFragment class put the following code:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.yourlistlayout, null);
return v;
}