Develop Reference

How to set visibility of RelativeLayout in Adapter from Fragment

I want to set the visibility of my relativelayout from my fragment using my adapter see the image below
HERE IS MY FRAGMENT
I declare relativeLayout to public so i can access it on my adapter to set its visibility but i always get an null error
How i can set the relativelayout visibility to visible when i click my checkbox. Please help me. Thanks a lot.
public class FoodListFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
public RelativeLayout relativeLayout;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private Food_RecyclerAdapter adapter;
private List<Food> foods;
private ApiInterface apiInterface;
ProgressBar progressBar;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public FoodListFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment FoodListFragment.
*/
// TODO: Rename and change types and number of parameters
public static FoodListFragment newInstance(String param1, String param2) {
FoodListFragment fragment = new FoodListFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_food_list, container, false);
AppCompatDelegate.setCompatVectorFromResourcesEnabled(true);
recyclerView = (RecyclerView)view.findViewById(R.id.recycleViewFood);
layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
relativeLayout = (RelativeLayout)view.findViewById(R.id.cart_add);
relativeLayout.setVisibility(View.GONE);
apiInterface = ApiClient.getClient().create(ApiInterface.class);
progressBar = (ProgressBar)view.findViewById(R.id.progress_bar);
progressBar.setVisibility(View.VISIBLE);
Bundle bundle = this.getArguments();
String category_id = bundle.getString("menu_id");
Call<List<Food>> call = apiInterface.getFoodList(category_id);
call.enqueue(new Callback<List<Food>>() {
#Override
public void onResponse(Call<List<Food>> call, Response<List<Food>> response) {
foods = response.body();
adapter = new Food_RecyclerAdapter(getContext(),foods);
recyclerView.setAdapter(adapter);
progressBar.setVisibility(View.GONE);
}
#Override
public void onFailure(Call<List<Food>> call, Throwable t) {
progressBar.setVisibility(View.GONE);
Toast.makeText(getContext(), "Please check your network connection", Toast.LENGTH_SHORT).show();
}
});
EditText searhText = (EditText)view.findViewById(R.id.search_food);
searhText.addTextChangedListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
adapter.getfilter().filter(s.toString());
}
#Override
public void afterTextChanged(Editable s) {
}
});
return view;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
HERE IS MY ADAPTER
public class Food_RecyclerAdapter extends RecyclerView.Adapter<Food_RecyclerAdapter.myViewHolder>{
Context context;
public List<Food> foods;
public List<Food> mOriginalValues;
public List<Food> mDisplayedValues;
ApiClient apiClient;
FoodListFragment foodListFragment;
public Food_RecyclerAdapter(Context context,List<Food> foods){
this.context = context;
this.foods = foods;
this.mOriginalValues = foods;
this.mDisplayedValues = foods;
}
#Override
public myViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.food_list_row,parent,false);
return new myViewHolder(view);
}
#Override
public void onBindViewHolder(final myViewHolder holder, int position) {
apiClient = new ApiClient();
Picasso.with(context).load(apiClient.BASE_URL + foods.get(position).getImage()).into(holder.food_image);
holder.food_check.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(holder.food_check.isChecked()){
//HERE I WANT TO SHOW THE RELATIVE LAYOUT WHEN I CLICK MY CHECKBOX
foodlistFragment = new FoodListFragment();
foodListFragment.relativeLayout.setVisibility(View.VISIBLE);
}else{
holder.food_qty.setText(""+0);
}
}
});
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getItemCount() {
return foods.size();
}
public class myViewHolder extends RecyclerView.ViewHolder{
TextView food_price,food_availability,food_qty;
ImageView food_image,remove_image,add_image;
CheckBox food_check;
public myViewHolder(View itemView) {
super(itemView);
food_check = (CheckBox) itemView.findViewById(R.id.radioFood_name);
food_image = (ImageView)itemView.findViewById(R.id.food_image);
food_availability = (TextView) itemView.findViewById(R.id.food_availability);
food_price = (TextView) itemView.findViewById(R.id.food_price);
food_qty = (TextView) itemView.findViewById(R.id.food_qty);
add_image = (ImageView)itemView.findViewById(R.id.add_image);
remove_image = (ImageView)itemView.findViewById(R.id.remove_image);
}
}
}
Here is the XML
<RelativeLayout
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"
tools:context="com.example.jampol.blogs.FoodListFragment">
<EditText
android:layout_width="match_parent"
android:layout_height="40dp"
android:id="#+id/search_food"
android:drawableStart="#drawable/ic_search"
android:paddingLeft="20dp"
android:paddingRight="20dp"
android:drawablePadding="10dp"
android:hint="Search.."
android:gravity="center_vertical"
android:textSize="18dp"
android:background="#color/colorPrimary"
android:textColorHint="#color/white"
android:textColor="#color/white"
/>
<ProgressBar
android:id="#+id/progress_bar"
style="?android:progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_centerInParent="true"
/>
<android.support.v7.widget.RecyclerView
android:id="#+id/recycleViewFood"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="vertical"
android:layout_below="#+id/search_food"
android:layout_alignParentStart="true"
android:layout_above="#+id/cart_add">
</android.support.v7.widget.RecyclerView>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/cart_add"
android:layout_alignParentBottom="true"
android:padding="5dp"
android:layout_alignParentStart="true">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Total"
android:textSize="16dp"
android:paddingRight="10dp"
android:layout_centerVertical="true"
android:textStyle="bold"
android:id="#+id/total"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/total"
android:text="100000"
android:textSize="16dp"
android:layout_centerVertical="true"
android:textStyle="bold"
/>
<Button
android:layout_width="wrap_content"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:background="#color/red"
android:textColor="#color/white"
android:layout_height="35dp"
android:layout_alignParentRight="true"
android:text="Add to cart" />
</RelativeLayout>

Hope this will help you.
You do not need to pass fragment's object in your adapter nor you need to define Relativelayout in your fragment as a public.
Follow this steps it may be lengthy but you can achieve your desire result :
Just pass your activity of fragment as a context in your adapter.
Like this :
adapter = new Food_RecyclerAdapter(getActivity(),foods);
Then in your adapter where you want to show or hide your views do something
like this:
Cast your context to your fragment's activity. Let's your fragment is inside
your MainActivity. So this would be :
MainActivity mActivity = ((MainActivity)context);
Make a public method in your MainActivity and getCurrentFragment of your
activity something like this:
public void showHideViews(){
Fragment currentFragment = getActiveFragment();
if(currentFragment != null){
//Access public method of your fragment from here
((FoodListFragment)currentFragment).showHideViews();
}
}
Make showHideViews() method in your FoodListFragment :
public void showHideViews(){
yourRelativeLayout.setVisibility(View.GONE);
}
First time it looks lengthy but this will be convenient.
Hope it helps you.

you need to pass a listener to your fragment like this:
in your adapter:
private MyClickListener clickListener;
interface MyClickListener{
void onClick(View v, int position);
}
public void setOnMyClickListener(MyClickListener clickListener){
this.clickListener = clickListener;
}
in your holder.food_check onClick:
if(clickListener != null){
clickListener.onClick(v,position);
}
in your fragment(when create adapter):
adapter.setOnMyClickListener(new Food_RecyclerAdapter.MyClickListener()
{
#Override
public void onClick(View v,int position) {
relativeLayout.setVisibility(View.VISIBLE);//or gone
}
});

Your foodListFragment object is not initialized in adapter class. it is null and you are trying to call foodListFragment.relativeLayout.setVisibility(View.VISIBLE); on checkbox click listener in adapter.
So pass foodListFragment reference from Fragment to Adapter class and in adapter class constructor make sure it is initialized.

Android ListView not being displayed/refreshing and getView not working properly

Objective: I have one activity and within two fragments. The ideia is to communicate both fragments, selecting one category and updating its item list.On activity load, a category is settle by default.
Problem: On activity load, ItemsFragment doesn't display/update itemsLisView. Also ItemAdapter's getView Method is being called only twice, even though the list has five items.
Facts:
Items List is being correctly fulfilled before being passed to adapter
Breakpointing the code, not sure why or if it matters, ItemsFragment is being rendered/called before CategoriesFragments. I found this weird since CategoriesFragments is positioned above ItemsFragment. This is the reason why I wrote if (getArguments() != null). Before I was getting Null Pointer Exception.
Research: There is a lot of questions regarding both subjects.
Android ListView not refreshing after notifyDataSetChanged with data as Map
ListFragment Not Rendering and getView() in Adapter Not Being Called
Android getView() not being called properly?
BaseAdapter notifyDatasetChanged() called but getView() is never called
Those are some link examples (of thousands) I went through, trying to find a solution for my case. Unfortunately none of them worked.
I've been with this problem for almost 5 days now and I guess I missing some Android concept here. It's not something related with Java Programming, or at least I hope so.
Questions:
Why ItemsFragment is not displaying Items List on activity load? (This probably answers updating problem)
Why ItemAdapter just calls getView only twice, even that Items List is correctly given to him with more items?
For any further needed information, please don't mind to ask.
Thanks in advance for any help.
EDIT - MCVE:
activity_triple_list:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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:fitsSystemWindows="true"
tools:context=".controller.activities.Lists">
<include layout="#layout/content_triple_list" />
</android.support.design.widget.CoordinatorLayout>
content_triple_list:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/listsPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.PagerTabStrip
android:id="#+id/pager_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:paddingBottom="4dp"
android:paddingTop="4dp" />
</android.support.v4.view.ViewPager>
</LinearLayout>
fragment_categories:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/categoriesFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TableLayout
android:id="#+id/categoriesTable"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:stretchColumns="4">
<TableRow
android:layout_width="fill_parent"
android:layout_height="match_parent"
android:layout_marginTop="5dp"
android:gravity="center_horizontal">
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_column="0"
android:layout_marginLeft="13dp"
android:layout_marginRight="13dp"
android:orientation="vertical">
<TextView
android:id="#+id/category1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="5dp"
android:text="CATEGORY 1"
android:textAlignment="center"
android:textAppearance="?android:attr/textAppearanceSmall" />
</LinearLayout>
</TableRow>
</TableLayout>
</LinearLayout>
fragment_items:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/itemsFragment"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<ListView
android:id="#+id/itemsListView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:divider="#null" />
</LinearLayout>
content_row_choose_item:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/custom_row"
android:orientation="vertical"
android:paddingBottom="5dp"
android:paddingLeft="15dp"
android:paddingTop="5dp">
<TextView
android:id="#+id/itemName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="TEST"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
custom_row:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" android:background="#2fff00">
<item android:drawable="#color/colorPrimary" android:state_pressed="true" /> <!-- pressed -->
</selector>
ApplicationUtils:
public final class ApplicationUtils extends Application {
private static Context context;
public void onCreate() {
super.onCreate();
ApplicationUtils.context = getApplicationContext();
}
public static Context getContext() {
return ApplicationUtils.context;
}
public static String getJavaPackageName() {
return ApplicationUtils.context.getPackageName();
}
public static Resources getAppResources() {
return getContext().getResources();
}
public static String getResouceName(Integer id) {
return getAppResources().getResourceName(id);
}
public static String getResourceString(Integer id) {
return getAppResources().getString(id);
}
public static int getResourceId(String variableName, String resourceName, String packageName) {
try {
return getContext().getResources().getIdentifier(variableName, resourceName, packageName);
} catch (Exception e) {
e.printStackTrace();
return -1;
}
}
}
Lists:
public class Lists extends AppCompatActivity implements CategoriesFragment.OnHeadlineSelectedListener {
private String listName;
public void onItemSelected(String currentCategory) {
ItemsFragment itemsCallBackFragment = (ItemsFragment) getSupportFragmentManager().findFragmentById(R.id.itemsFragment);
if (itemsCallBackFragment != null) {
itemsCallBackFragment.updateArticleView(currentCategory);
} else {
ItemsFragment itemFragment = new ItemsFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.itemsFragment, itemFragment);
transaction.addToBackStack(null);
transaction.commit();
}
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_triple_list);
setListsAdapter();
}
private void setListsAdapter() {
ViewPager tripleListViewPager = (ViewPager) findViewById(R.id.listsPager);
FragmentPagerAdapter tripleListFragmentAdapt = new ListsPagerAdapter(getSupportFragmentManager(), "LIST NAME", ApplicationUtils.getContext());
tripleListViewPager.setAdapter(tripleListFragmentAdapt);
}
}
ListsPagerAdapter:
public class ListsPagerAdapter extends FragmentPagerAdapter {
private static int NUM_TABS = 1;
private String listName;
private Context listsContext;
public ListsPagerAdapter(FragmentManager fm, String newListName, Context listsContext) {
super(fm);
setListName(newListName);
setListsContext(listsContext);
}
// Returns total number of pages
#Override
public int getCount() {
return NUM_TABS;
}
// Returns the fragment to display for that page
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return NewItemPagerFragment.newInstance();
default:
return null;
}
}
// Returns the page title for the top indicator
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return listsContext.getResources().getString(R.string.lists_tab_newItem, getListName());
default:
return "$value";
}
}
public String getListName() {
return listName;
}
public void setListName(String listName) {
this.listName = listName;
}
public Context getListsContext() {
return listsContext;
}
public void setListsContext(Context listsContext) {
this.listsContext = listsContext;
}
}
CategoriesFragment:
public class CategoriesFragment extends Fragment {
private List<Integer> categoryIds = new ArrayList<>();
private String currentCategory;
private View categoriesView;
OnHeadlineSelectedListener itemCallback;
public interface OnHeadlineSelectedListener {
void onItemSelected(String categoryName);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
try {
itemCallback = (OnHeadlineSelectedListener) context;
} catch (ClassCastException e) {
throw new ClassCastException(context.toString()
+ " must implement OnHeadlineSelectedListener");
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
categoriesView = inflater.inflate(R.layout.fragment_categories, container, false);
categoriesView.setId(R.id.categoriesFragment);
return categoriesView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setCategoriesListener();
setDefaultSelectedCategory();
}
private void setCategoriesListener() {
categoryIds.add(R.id.category1);
for (Integer id : categoryIds) {
setListener(id);
}
}
private void setListener(final int categoryId) {
final ImageView categoryImg = (ImageView) categoriesView.findViewById(categoryId);
categoryImg.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
removePreviousSelectedCategory(categoryImg);
selectCategory(categoryId, categoryImg);
loadItemList();
}
});
}
private void removePreviousSelectedCategory(ImageView categoryImg) {
for (Integer id : categoryIds) {
final ImageView imgView = (ImageView) categoriesView.findViewById(id);
if (imgView.getTag() != null) {
String previousSelectedCategory = (String) imgView.getTag();
if (StringUtils.contains(previousSelectedCategory, Application.SELECTED)) {
previousSelectedCategory = previousSelectedCategory.replace(Application.SELECTED, "");
categoryImg.setTag(previousSelectedCategory);
Integer previousSelectedCategoryId = ApplicationUtils.getResourceId(previousSelectedCategory, Application.RES_DRAWABLE, ApplicationUtils.getJavaPackageName());
imgView.setImageResource(previousSelectedCategoryId);
}
}
}
}
private void selectCategory(int categoryId, ImageView categoryImg) {
String newSelectedCategory = ApplicationUtils.getResouceName(categoryId) + Application.SELECTED;
setCurrentCategory(newSelectedCategory);
newSelectedCategory = newSelectedCategory.replace(Application.META_INFO_ID, "");
categoryImg.setTag(newSelectedCategory);
Integer currentCategoryId = ApplicationUtils.getResourceId(newSelectedCategory, Application.RES_DRAWABLE, ApplicationUtils.getJavaPackageName());
categoryImg.setImageResource(currentCategoryId);
}
public String getCurrentCategory() {
return currentCategory;
}
public void setCurrentCategory(String currentCategory) {
this.currentCategory = currentCategory;
}
private void loadItemList() {
itemCallback.onItemSelected(getCurrentCategory());
}
private void setDefaultSelectedCategory() {
Integer categoryId = R.id.category1;
final ImageView categoryImg = (ImageView) categoriesView.findViewById(categoryId);
selectCategory(categoryId, categoryImg);
loadItemList();
}
}
ItemsFragment:
public class ItemsFragment extends Fragment {
private View itemsFragmentView;
private ListView itemsListView;
private ItemAdapter itemsListAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
itemsFragmentView = inflater.inflate(R.layout.fragment_items, container, false);
itemsListView = (ListView) itemsFragmentView.findViewById(R.id.itemsListView);
setItemsListAdapter();
return itemsFragmentView;
}
public void updateArticleView(String categoryName) {
getSelectedCategoryList();
}
private void getSelectedCategoryList() {
List<String> testList = new ArrayList<>();
testList.add("TEST ITEM");
itemsListAdapter.update(testList);
}
private void setItemsListAdapter() {
itemsListAdapter = new ItemAdapter(getActivity(), R.layout.fragment_items, new ArrayList<String>());
itemsListView.setAdapter(itemsListAdapter);
}
}
ItemAdapter:
public class ItemAdapter extends ArrayAdapter<String> {
private List<String> items = new ArrayList<>();
private LayoutInflater rowInflater;
public ItemAdapter(Context context, int resource, List<String> itemsList) {
super(context, resource, itemsList);
this.items = itemsList;
this.rowInflater = LayoutInflater.from(context);
}
private class ItemHolder {
TextView itemNameView;
}
#Override
public View getView(int position, View rowView, ViewGroup parent) {
ItemHolder itemHolder;
if (rowView == null) {
rowView = rowInflater.inflate(R.layout.content_row_choose_item, parent, false);
itemHolder = new ItemHolder();
itemHolder.itemNameView = (TextView) rowView.findViewById(R.id.itemName);
rowView.setTag(itemHolder);
} else {
itemHolder = (ItemHolder) rowView.getTag();
}
String itemName = getItem(position);
if (StringUtils.isNotEmpty(itemName) && itemHolder.itemNameView != null) {
itemHolder.itemNameView.setText(itemName);
System.out.println("ITEM NAME ### " + itemHolder.itemNameView.getText());
}
return rowView;
}
public void update(List<String> items) {
this.items.clear();
this.items.addAll(items);
this.notifyDataSetChanged();
}
public List<String> getItems() {
return items;
}
}

Random stab...
If using a ListFragment, then fragment_items.xml needs a ListView with android:id="#android:id/list".
You are even trying to load the ListView with that id.
itemsFragmentView = inflater.inflate(R.layout.fragment_items, container, false);
itemsListView = (ListView) itemsFragmentView.findViewById(android.R.id.list);
However, you have android:id="#+id/itemsListView"
fragment_items:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#id/itemsFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ListView
android:id="#+id/itemsListView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:divider="#null" />
</LinearLayout>
If using a ListFragment, you do not need to implement your own XML layout file. That being said, onCreateView doesn't need implemented. Use onActivityCreated instead.
#Override
public void onActivityCreated(Bundle savedInstanceState) {
itemsListView = getListView();
itemsListAdapter = new ItemAdapter(getActivity());
setListAdapter(itemsListAdapter);
super.onActivityCreated(savedInstanceState);
}
Now, if you want to add items to the adapter, I generally recommend you just use an ArrayAdapter<String>. This will provide you an add(String object) method that will both add to the underlying list and notify for updates.
Regarding the getView problems, can't really say. I don't really know why you need ItemAdapter since the default ArrayAdapter<String> will work assuming you pass it a layout with android:id="#android:id/text1, for example using android.R.layout.simple_list_item_1 in place of R.layout.content_row_choose_item
So, that would look something like.
#Override
public void onActivityCreated(Bundle savedInstanceState) {
itemsListView = getListView();
ArrayAdapter<String> itemsListAdapter = new ArrayAdapter<String>(
getActivity(), android.R.layout.simple_list_item_1);
setListAdapter(itemsListAdapter);
adapter.add("Hello");
adapter.add("World");
super.onActivityCreated(savedInstanceState);
}

The given MCVE was working fine. After 7 days debugging and uncommenting code I found the answer to my problem.
My list was correctly being updated, but wasn't being rendered because of a second ItemsFragemnt being initialized on Lists Activity load. This second fragment was overlaying the first one and that's why I wasn't seing my list being displayed/refreshed.
Lists:
First created fragment:
private void setListsAdapter() {
ViewPager tripleListViewPager = (ViewPager) findViewById(R.id.listsPager);
FragmentPagerAdapter tripleListFragmentAdapt = new ListsPagerAdapter(getSupportFragmentManager(), "LIST NAME", ApplicationUtils.getContext());
tripleListViewPager.setAdapter(tripleListFragmentAdapt); }
Inside ListsPagerAdapter there was a call to populate my ViewPager (NewItemPagerFragment) with CategoriesFragment and ItemsFragment.
Second created fragment - Overlay:
ItemsFragment itemFragment = new ItemsFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.itemsFragment, itemFragment);
transaction.addToBackStack(null);
transaction.commit();
I tried to breakpoint my code, mentioned before in Facts at question scope, but sometimes this is really painful. I came with the idea to use Log.d(TAG_KEY, TAG_NAME); and that was when I found out the answer: I realized that ItemsFragment was being called twice on Activity load.
I searched for new ItemsFragment in my project and saw that inside my NewItemPagerFragment onCreate, ItemsFragment was being called. Also before CategoriesFragment- just like this:
NewItemPagerFragment:
Fragment itemsFragment = new ItemsFragment();
FragmentManager fm1 = getChildFragmentManager();
FragmentTransaction ft1 = fm1.beginTransaction();
ft1.replace(R.id.itemsFragment, itemsFragment);
ft1.commit();
Fragment categoriesFragment = new CategoriesFragment();
FragmentManager fm = getChildFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.categoriesFragment, categoriesFragment);
ft.commit();
which explains Facts 2.. After commenting/remove this call on NewItemPagerFragment the problem was gone.
Bottom line is: Make sure your list is correctly being fulfilled/updated with things like notifyDataSetChanged as cricket_007 mentioned in his answer and other thousand posts I read on internet. Not less, make sure you are not overlaying the fragment calling its initialization twice.

Open Fragment OnClick on Recyclerview item from ApI

I am getting data from API in recycleview using AQuery but now i want to open fragment from API onclick on recyclerview item so how can i implement this.
I want to do same as Instagram app,like on home page when we click on name we get all the details of users on another fragment.

//CouponFragment.java
public class CouponFragment extends Fragment implements CouponList.OnActionCompleted{
private RecyclerView recyclerView;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
recyclerView = new RecyclerView(getActivity());
return recyclerView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArrayList<String> coupons = new ArrayList<>();
coupons.add("Tamil");
coupons.add("English");
coupons.add("Malay");
coupons.add("Chinese");
recyclerView.setAdapter(new CouponList(coupons,CouponFragment.this));
}
#Override
public void OnClick(Coupon coupon){
//new fragment
CouponDetails couponDetails = new CouponDetails();
FragmentTransaction transaction = getActivity().getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.home_container, couponDetails);
//R.id.home_container is your FrameLayout id
transaction.addToBackStack("couponDetails");
transaction.commit();
}
}
cardview_coupon_info.xml
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/tools"
android:foreground="?android:attr/selectableItemBackground"
android:transitionName="coupon_info_card"
android:id="#+id/coupon_info_card"
android:clickable="true"
android:layout_margin="#dimen/item_margin"
card_view:cardElevation="6dp"
card_view:cardCornerRadius="4dp">
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:id="#+id/coupon_description"
android:gravity="start"
android:layout_margin="4dp" />
</android.support.v7.widget.CardView>
CouponList.java (Recyclerview adapter)
public class CouponList extends RecyclerView.Adapter<CouponList.ViewHolder> {
private ArrayList<String> coupons;
private OnActionCompleted callback;
public CouponList(ArrayList<String> coupons,OnActionCompleted callback)
{
this.coupons = coupons;
this.callback = callback;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return new ViewHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.cardview_coupon_info,parent,false));
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.description.setText(coupons.get(position);
}
#Override
public int getItemCount() {
return coupons.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView description;
public ViewHolder(View itemView) {
super(itemView);
description = (TextView) itemView.findViewById(R.id.coupon_description);
itemView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
String coupon = coupons.get(getAdapterPosition());
callback.OnClick(coupon);
}
}
public interface OnActionCompleted {
public void OnClick(Coupon coupon);
}
}
You can use this in Activity as well for easy implementation for multiple widget clicks in recycler view item :)

Do the following in your recycler view item onClick.
FragmentManager fm = getFragmentManager();// If you're in an activity.
FragmentManager fm = getSupportFragmentManager();// If you're already inside another fragment
YourFragment yfObj = new YourFragment();
fm.beginTransaction().replace(R.id.fragmentContainer, yfObj).commit();
Here, fm is the FragmentManager object, with which only you can conduct a fragment transaction, such as loading a new fragment.
yfObj is the object of the fragment class that you want to load.
R.id.fragmentContainer is the id of the container layout you have declared in your XML file, where you want to load the fragment.
Hope this helps !

Remove Activity Views after Fragment Loads

I have an activity that hosts a fragment. The activity essentially has no content except a spinner that indicates the fragment is loading. The fragment is dependent upon a stable internet connection, therefore the length of time required for the spinner to be visible is dynamic in nature.
I want to remove the spinner on the activity after the fragment successfully loads. I tried using the isAdded() method, however that approach did not work. Any help is appreciated:
Fragment:
public class LatestFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private RecyclerView mRecyclerViewForLatestPolls;
private RecyclerView.Adapter mLatestAdapter;
private ArrayList<LatestPoll> mLatestPollsArray;
private DateFormat mDateFormat;
private Date mDate;
private String mCurrentDateString;
private Firebase mBaseRef;
private Firebase mPollRef;
private Firebase mUpdateRef;
private FragmentListener mFragmentListener;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public LatestFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment LatestFragment.
*/
// TODO: Rename and change types and number of parameters
public static LatestFragment newInstance(String param1, String param2) {
LatestFragment fragment = new LatestFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDateFormat = new SimpleDateFormat("MM-dd-yyyy");
mDate = new Date();
mCurrentDateString = mDateFormat.format(mDate);
mBaseRef = FirebaseUtil.FIREBASE;
mPollRef = mBaseRef.child("Polls");
mUpdateRef = mPollRef.child(mCurrentDateString);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_latest, container, false);
getActivity().setTitle(R.string.latest_title);
mRecyclerViewForLatestPolls = (RecyclerView) rootView.findViewById(R.id.latest_RecyclerView);
mLatestPollsArray = new ArrayList<>();
mLatestAdapter = new MyAdapter(mLatestPollsArray);
LinearLayoutManager llm = new LinearLayoutManager(getActivity().getApplicationContext());
llm.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerViewForLatestPolls.setLayoutManager(llm);
mRecyclerViewForLatestPolls.setItemAnimator(new SlideInLeftAnimator());
mRecyclerViewForLatestPolls.setAdapter(new AlphaInAnimationAdapter(mLatestAdapter));
mUpdateRef.addListenerForSingleValueEvent(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
int numberOfPollsForDay = (int) dataSnapshot.getChildrenCount();
for (int i = 0; i < numberOfPollsForDay; i++) {
String latestPollQuestion = (String) dataSnapshot.child(String.valueOf(i + 1)).child("Poll_Question").getValue();
String pollImageURL = (String) dataSnapshot.child(String.valueOf(i + 1)).child("Image").getValue();
mLatestPollsArray.add(0, new LatestPoll(latestPollQuestion, pollImageURL));
mLatestAdapter.notifyDataSetChanged();
}
}
#Override
public void onCancelled(FirebaseError firebaseError) {
}
});
// Inflate the layout for this fragment
return rootView;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
// Force the parent activity to implement listener.
if (context instanceof FragmentListener) {
mFragmentListener = (FragmentListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
mFragmentListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private ArrayList<LatestPoll> mDataSet;
int lastPosition = -1;
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
public class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
protected TextView pollQuestion;
protected ImageView pollImage;
public ViewHolder(View v) {
super(v);
pollQuestion = (TextView) v.findViewById(R.id.latest_item_question);
pollImage = (ImageView) v.findViewById(R.id.pollThumbNailImage);
}
}
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(ArrayList<LatestPoll> myDataset) {
mDataSet = myDataset;
}
// Create new views (invoked by the layout manager)
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.latest_item, parent, false);
// set the view's size, margins, paddings and layout parameters
return new ViewHolder(v);
}
// Replace the contents of a view (invoked by the layout manager)
//The OutOfBoundsException is pointing here
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Log.v("ON_BIND", "ON_BINDVIEWHOLDER CALLED");
LatestPoll latestPoll = mDataSet.get(position);
holder.pollQuestion.setText(latestPoll.getQuestion());
Picasso.with(getActivity())
.load(latestPoll.getPollImage())
.fit()
.placeholder(R.drawable.loading_spinnter_white)
.into(holder.pollImage);
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataSet.size();
}
}
private void onLoad() {
if (mFragmentListener != null) {
mFragmentListener.onFragmentLoaded();
}
}
public interface FragmentListener {
void onFragmentLoaded();
}
}
Activity XML:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/black"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/action_tool_bar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/black"
android:titleTextColor="#color/white">
</android.support.v7.widget.Toolbar>
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ProgressBar
android:id="#+id/pbHeaderProgress"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_centerInParent="true"
android:progressDrawable="#drawable/loading_spinnter_white">
</ProgressBar>
<TextView
android:id="#+id/progress_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/pbHeaderProgress"
android:layout_centerHorizontal="true"
android:layout_gravity="center_horizontal"
android:gravity="center"
android:text="#string/loading_poll_data"
android:textColor="#color/white"
android:textSize="24sp" />
</RelativeLayout>
<FrameLayout
android:id="#+id/latest_fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
</FrameLayout>
</LinearLayout>
<!-- The navigation drawer -->
<ListView
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#111"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp" />
Image:

In fragment create a listener interface,
private MyFragmentListener mListener;
/**
* onLoad should be called when the fragment has loaded.
*/
private void onLoad() {
if (mListener != null) {
mListener.onFragmentLoaded();
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
// Force the parent activity to implement listener.
if (context instanceof MyFragmentListener) {
mListener = (MyFragmentListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface MyFragmentListener {
void onFragmentLoaded();
}
Then in parent activity,
public class MainActivity extends Activity implements MyFragment.MyFragmentListener{
#Override
public void onFragmentLoad() {
// HIDE the progressbar spinner.
}
See Communicating with Other Fragments for more info.

How to solve listview with objects, single pane in portrait, dual pane in landscape

Im in a picle, currently trying to learn me some Android using The Big Nerd Ranch guide.
But im having trouble understanding how i can get the app to rearrange the "detail view" from "new fragment" overlapping the listview to sidebyside view (listview left, details right).
Ive tried so many different guides and tutorials around the web now, but i guess im just to unstable in this to really figure it out. Cause all of them one way or another just ends up beeing nullpoint and so on. And im guessing that has something to do with the way the "book" builds it up vs the guides ive seen. So hopefully someone here can give me an hint.
The following code will display and listview, and when i click on an item it will replace the list fragment with another fragment displaying that item based on id from the click.
Need it to display that information next to the listview when in landscape.
SignsMainActivity.class (first to be started with:
Intent i = new Intent(getActivity(),SignsMainActivity.class);
startActivity(i);)
public class SignsMainActivity extends SingleFragmentActivity {
#Override
protected Fragment createFragment() {
return new SignsMainFragment(); }}
SignsMainFragment.class
public class SignsMainFragment extends ListFragment {
private ArrayList<Signs> storage;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
storage = SignStorage.get(getActivity()).getStorageOfSigns();
SignAdapter adapter = new SignAdapter(storage);
setListAdapter(adapter);
}
#Override
public void onResume() {
super.onResume();
((SignAdapter)getListAdapter()).notifyDataSetChanged();
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
Signs signs = ((SignAdapter)getListAdapter()).getItem(position);
Intent intent = new Intent(getActivity(), SignsActivity.class);
intent.putExtra(SignsFragment.EXTRA_SIGNS_ID, signs.getId());
startActivity(intent);}
private class SignAdapter extends ArrayAdapter<Signs> {
public SignAdapter(ArrayList<Signs> sSigns){
super(getActivity(), 0, sSigns);
}
#Override
public View getView(int position, View convertView, ViewGroup parent){
//If we were given a view, inflate one
if(convertView ==null){
convertView = getActivity().getLayoutInflater().inflate(R.layout.sign_row, null);
}
//Configure the view for this Crime
Signs signs = getItem(position);
TextView titleTextView = (TextView)convertView.findViewById(R.id.label);
titleTextView.setText(signs.getName());
return convertView; }}}
SignsActivity.class
public class SignsActivity extends SingleFragmentActivity {
#Override
protected Fragment createFragment() {
UUID signsId = (UUID) getIntent().getSerializableExtra(SignsFragment.EXTRA_SIGNS_ID);
return SignsFragment.newInstance(signsId);}}
SignsFragment.class
public class SignsFragment extends Fragment{
public static final String EXTRA_SIGNS_ID = "signs_id";
private Signs mSign;
private TextView nameURLView;
private TextView imageURLView;
private TextView illustrationURLView;
#Override
public void onCreate(Bundle saveInstanceState){
super.onCreate(saveInstanceState);
UUID signsID = (UUID)getArguments().getSerializable(EXTRA_SIGNS_ID);
mSign = SignStorage.get(getActivity()).getSign(signsID);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup parent, Bundle savedInstanceState){
View view = inflater.inflate(R.layout.sign_details,parent,false);
nameURLView = (TextView)view.findViewById(R.id.details);
nameURLView.setText(mSign.getName());
return view;
}
public static SignsFragment newInstance(UUID signsId){
Bundle args = new Bundle();
args.putSerializable(EXTRA_SIGNS_ID, signsId);
SignsFragment fragment = new SignsFragment();
fragment.setArguments(args);
return fragment;
}}
SingleFragmentActivity.class (im guessing here is where i need to adjust the magic?)
public abstract class SingleFragmentActivity extends FragmentActivity {
//Used to instanciate the fragment (subclasses of this class will implement the method to return an instance of the fragment that the activity is hosting)
protected abstract Fragment createFragment();
private FragmentManager fm;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_single_fragment);
fm = getSupportFragmentManager();
Fragment fragment = fm.findFragmentById(R.id.singleFragmentContainer);
if(fragment == null){
fragment = createFragment();
fm.beginTransaction().add(R.id.singleFragmentContainer, fragment).commit();
}
}}
Storage of sign objects:
public class SignStorage {
private static SignStorage mSignStorage;
private Context context;
private ArrayList<Signs> storageOfSigns;
private Signs signs;
private static final String TAG="xx";
private SignStorage(Context appContext){
context = appContext;
storageOfSigns = new ArrayList<Signs>();
primitiveFix();
}
public static SignStorage get(Context c){
if (mSignStorage == null){
mSignStorage = new SignStorage(c.getApplicationContext());
}
return mSignStorage;
}
public ArrayList<Signs> getStorageOfSigns() {
return storageOfSigns;
}
public void setStorageOfSigns(ArrayList<Signs> storageOfSigns) {
this.storageOfSigns = storageOfSigns;
}
public Signs getSign(UUID id){
for (Signs s : storageOfSigns){
if (s.getId().equals(id))
return s;
}
return null;
}
private void primitiveFix(){
String basePath = Environment.getExternalStorageDirectory().toString()+"/PictureTalk/Signs/";
String name;
String imageURL;
String videoUrl;
String illuUrl;
Signs s;
name = "abonnere";
imageURL = basePath+"picture/adresse.jpg";
videoUrl = basePath+"video/adresse.mp4";
illuUrl = basePath+"illustrative/adresse.jpg";
s = new Signs(name,imageURL,videoUrl,illuUrl);
storageOfSigns.add(s);
THIS LIST GOES ON DOWNWARDS to get some items to display, will be filled later in another
way...
Signs.class
public class Signs {
UUID id;
String name;
String videoURL;
String imageURL;
String illustrativeURL;
public Signs(String name,String videoURL,String imageURL,String illustrativeURL){
this.id = UUID.randomUUID();
this.name = name;
this.videoURL = videoURL;
this.imageURL = imageURL;
this.illustrativeURL = illustrativeURL;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getVideoURL() {
return videoURL;
}
public void setVideoURL(String videoURL) {
this.videoURL = videoURL;
}
public String getBitmapURL() {
return imageURL;
}
public void setBitmapURL(String bitmapURL) {
this.imageURL = bitmapURL;
}
public UUID getId() {
return id;
}
}
acitivty_single_fragment.xml (first blank xml)
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/singleFragmentContainer"
android:layout_width="match_parent"
android:layout_height="match_parent">
</FrameLayout>
sign_row.xml (xml for the listview)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/label"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#+id/label"
android:textSize="20px" >
</TextView>
</LinearLayout>
sign_details.xml (detail area for the object to be displayed, havent added more then textbox jet...)
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<TextView
android:id="#+id/details"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#+id/label"
android:textSize="20px" >
</TextView>
</LinearLayout>

To implement a list / detail screen using fragments, you want to have a single activity that contains two fragments, not two separate activities. Generally, you can think of an activity as representing a full screen.
In other words, you don't need SingleFragmentActivity or SignsActivity. Your SignsMainActivity layout XML can then have your list and details fragment side-by-side. The fragments guide has a good example of the XML:
http://developer.android.com/guide/components/fragments.html
Copying that XML and changing the names gives you a new signs_main_activity.xml:
<?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="SignsMainFragment"
android:id="#+id/signs-main"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<fragment android:name="SignsFragment"
android:id="#+id/signs"
android:layout_weight="2"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
Then set this XML as your main activity's content view:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.signs_main_activity);
}