The main problem I am running into is that when I try to update my PagerAdapter with a brand new set of data, I get a FC. More specifically, I get the FC only if I remove something from the PagerAdapter's dataset.
In my Main activity I have this loader callback:
#Override
public void onLoadFinished(Loader<Cursor> loader, Cursor newCursor) {
List<CycleItem> cycleItems = CursorInflator.inflateList(newCursor, CycleItem.class);
mCycleAdapter.setCycleList(cycleItems);
mIndicator.notifyDataSetChanged();
}
Here is my CycleViewPagerAdapter (mCycleAdapter is a reference to this):
public class CycleViewPagerAdapter extends FragmentPagerAdapter implements TitleProvider {
private ArrayList<CycleItem> mCycleItems;
private CyclePagerCallbacks mParent;
public CycleViewPagerAdapter(CyclePagerCallbacks parent, FragmentManager fm) {
super(fm);
mParent = parent;
mCycleItems = new ArrayList<CycleItem>();
}
public CycleViewPagerAdapter(FragmentManager fm, List<CycleItem> cycleItems) {
super(fm);
mCycleItems = (ArrayList<CycleItem>) cycleItems;
}
public void setCycleList(List<CycleItem> cycleItems) {
mCycleItems = (ArrayList<CycleItem>) cycleItems;
notifyDataSetChanged();
}
#Override
public Fragment getItem(int position) {
return CycleDetailFragment.newInstance(mParent, mCycleItems.get(position % mCycleItems.size()).getId());
}
public String getTitle(int position) {
return mCycleItems.get(position % mCycleItems.size()).getName();
}
#Override
public int getCount() {
if (mCycleItems != null) {
return mCycleItems.size();
} else {
return 0;
}
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
This CycleViewPagerAdapter creates and returns CycleDetailFragments when the getItem method is called. Here is that class:
public class CycleDetailFragment extends Fragment implements PaginatedFragmentProtocol {
public interface CyclePagerCallbacks {
public void removeCycle(Uri cycleUri);
}
private static final String TAG = "CycleDetailFragment";
private CyclePagerCallbacks mParent;
private long mCycleId;
private Cycle cycle;
private static final String CYCLE_ID_KEY = "cycle_id";
private TextView mCycleName;
private TextView mNumItem;
private Button mDeleteCycle;
public static CycleDetailFragment newInstance(CyclePagerCallbacks parent, long cycleId) {
CycleDetailFragment cycleDetailFragment = new CycleDetailFragment(parent);
Bundle bundle = new Bundle();
bundle.putLong(CYCLE_ID_KEY, cycleId);
cycleDetailFragment.setArguments(bundle);
return cycleDetailFragment;
}
public CycleDetailFragment(CyclePagerCallbacks parent) {
mParent = parent;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle arguments = getArguments();
if (arguments != null) {
mCycleId = arguments.getLong(CYCLE_ID_KEY);
} else {
mCycleId = 0;
}
Log.i(TAG, Long.toString(mCycleId));
final Uri cycleUri = ContentUris.withAppendedId(CycleContentProvider.CONTENT_URI, mCycleId);
Cursor cursor = getActivity().getContentResolver().query(cycleUri, null, null, null, null);
final Cycle cycle = CursorInflator.inflateOne(cursor, Cycle.class);
Uri cycleItemsUri = ContentUris.withAppendedId(CycleItemContentProvider.CYCLE_ID_FIELD_CONTENT_URI, mCycleId);
Cursor cycleItemsCursor = getActivity().getContentResolver().query(cycleItemsUri, null, null, null, null);
mCycleName.setText(cycle.getName() + " " + cycle.getId());
mNumItem.setText(Integer.toString(cycleItemsCursor.getCount()));
mDeleteCycle.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
getActivity().getContentResolver().delete(cycleUri, null, null);
mParent.refresh();
}
});
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
Log.i("Creating View", "Cycle ID: " + mCycleId);
View view = inflater.inflate(R.layout.cycle_detail, container, false);
mCycleName = (TextView) view.findViewById(R.id.cycle_name);
mNumItem = (TextView) view.findViewById(R.id.num_items);
mDeleteCycle = (Button) view.findViewById(R.id.delete_cycle);
return view;
}
#Override
public String getFragmentTitle() {
return cycle.getName();
}
}
So you see that the CycleDetailFragment looks in the database for information to populate the view.
Here is the problem I am having. After I DELETE a Cycle from the database, the onLoadFinished method is called and the cycleItems is populated with the correct items, but once mCycleAdapter.setCycleList(cycleItems) is called after this deletion I get my error. The onAcitivityCreated method in the CycleDetailFragment is called (not by me or my PagerAdapter - something else internal), but it is fed data that should no longer exist! The bundle that it is passed contains the cycleId of the item that I just deleted and that does not exist in the freshly pulled cycleItems list that I just created. So, it tries to pull something from the database that no longer exists and null pointer exceptions are thrown.
How can I refresh the dataset of my PagerAdapter without the ViewPager trying to use old data first?
shouldn't you use FragmentStatePagerAdapter here?
Related
I try to use AsyncTaskLoader in Fragment that is a child of ViewPager. Below a code of my DayFragment:
public class DayFragment extends Fragment
implements LoaderManager.LoaderCallbacks<DayAdapter.DayItem[]> {
private static final int CONTENT_LOADER = 0;
private DayAdapter mAdapter = null;
private int mWeekNumber = 1;
private int mDayCode = 1;
private Table.Timetable mTimetable;
private RecyclerView mRVContent;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final MainActivity mainActivity = (MainActivity) getActivity();
View v = inflater.inflate(R.layout.content, container, false);
mRVContent = (RecyclerView) v.findViewById(R.id.rvContent);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(mainActivity);
mRVContent.setLayoutManager(layoutManager);
mAdapter = new DayAdapter(getActivity());
mRVContent.setAdapter(mAdapter);
//Initialize the cursor loader
getLoaderManager().initLoader(CONTENT_LOADER, null, this).forceLoad();
return v;
}
#Override
public Loader<DayAdapter.DayItem[]> onCreateLoader(final int id, Bundle args) {
if(CONTENT_LOADER == id) {
return new ContentLoader(getContext(), mWeekNumber, mDayCode, mTimetable);
}
return null;
}
#Override
public void onLoadFinished(Loader loader, DayAdapter.DayItem[] items) {
if(CONTENT_LOADER == loader.getId()) {
mAdapter.setIs24HourFormat(SettingsManager.is24HourFormat(getContext()));
mAdapter.clear();
for (DayAdapter.DayItem item : items) {
mAdapter.add(item);
}
mAdapter.notifyDataSetChanged();
if (items.length == 0) {
mRVContent.setBackgroundResource(R.drawable.bg_lesson_empty);
} else {
mRVContent.setBackgroundColor(0xFFFFFFFF);
}
}
}
#Override
public void onLoaderReset(Loader loader) {
}
private static final class ContentLoader extends AsyncTaskLoader<DayAdapter.DayItem[]> {
private final int mWeekNumber;
private final int mDayCode;
private final Table.Timetable mTimetable;
public ContentLoader(Context context, final int weekNumber, final int dayCode,
Table.Timetable timetable) {
super(context);
mWeekNumber = weekNumber;
mDayCode = dayCode;
mTimetable = timetable;
}
#Override
public DayAdapter.DayItem[] loadInBackground() {
DatabaseHandler db = new DatabaseHandler(getContext());
db.openReadable();
List<Table.Lesson> lessons = db.findLessons(mDayCode, mWeekNumber, mTimetable.getId());
DayAdapter.DayItem[] items = new DayAdapter.DayItem[lessons.size()];
for (int i = 0; i < items.length; ++i) {
Table.Lesson lesson = lessons.get(i);
Table.Subject subject = db.getSubject(lesson.getSubjectId());
Table.Teacher teacher = db.getTeacher(lesson.getTeacherId());
if (teacher == null) {
teacher = new Table.Teacher(""); //Empty name
}
items[i] = new DayAdapter.DayItem()
.setId(lesson.getId())
.setTitle(subject.getTitle())
.setSubtitle(teacher.getName()));
}
db.close();
return items;
}
}
}
PageAdapater
public class PageAdapter extends FragmentStatePagerAdapter {
public static final int PAGE_COUNT = 7;
private int mWeekNumber;
private final int[] mDayCodes;
private final String[] mDays;
private final DayFragment[] mFragments = new DayFragment[7];
private Table.Timetable mTimetable;
private boolean mIsRebuildMode = false;
public PageAdapter(Context context, FragmentManager fm,
Table.Timetable timetable, final int weekNumber) {
super(fm);
//Initialize class members
}
#Override
public Fragment getItem(int position) {
DayFragment dayFragment;
if (mFragments[position] == null) {
dayFragment = new DayFragment();
Bundle args = new Bundle();
args.putSerializable(Keys.TIMETABLE, mTimetable);
dayFragment.setArguments(args);
dayFragment.setWeekNumber(mWeekNumber);
dayFragment.setDayCode(mDayCodes[position]);
mFragments[position]= dayFragment;
} else {
dayFragment = mFragments[position];
}
return dayFragment;
}
#Override
public void restoreState(Parcelable arg0, ClassLoader arg1) {
//do nothing here! no call to super.restoreState(arg0, arg1);
}
public void setWeekNumber(final int weekNumber) {
mWeekNumber = weekNumber;
Arrays.fill(mFragments, null);
}
public void setIsRebuildMode(final boolean isRebuildMode) {
mIsRebuildMode = isRebuildMode;
}
#Override
public CharSequence getPageTitle(final int position) {
return mDays[position];
}
#Override
public int getCount() {
return PAGE_COUNT;
}
#Override
public int getItemPosition(Object object) {
if(mIsRebuildMode) {
return POSITION_NONE;
}
return super.getItemPosition(object);
}
}
But it doesn't call onLoadFinished method. I checked Log output... LoaderManager calls onCreateLoader but it never calls onLoadFinished except first run (when app started and ViewPager shows a first page (Fragment)). It's all! After if I switch a page to a next and a next and return to a first page LoaderManager doesn't call onLoadFinished for the first page too. But it creates loader calling onCreateLoader and resets loader calling onLoaderReset. Is it a joke from Google?
See fragment lifecycle. ViewPager don't re create fragment, just swipe them
-- Start ViewPager
: create
: createView
: start
: resume
not changed if you swipe fragments
--- sleep smartphone
: pause
: stop
--- wakeup smartphone
: start
: resume
: pause
--- Close ViewPager
: stop
: detach
I am using tabLayout which is attached with the viewPager. I have implemented viewPager Adapter using FragmentStatePager adapter, because the tabLayout list is big.
ViewPager creates a new instance of each fragment, and inside the fragment, i am using recyclerView to the data.
Now, before initiating the viewPager i am making a call to the server, and in success response, i am initiating viewPager for the first time. Then viewPager calls its getItem() callback, where it gets the data for the first position initialises the fragment and it's recyclerView.
It also call getItem() for the next position as i have set the offScreenLimit() to 2, which is fine and working well.
The problem is when it calls getItem() and creates the fragment, at that time, i am checking if i have the data, if not, then i am making a callback to get data from server.
And if user visits that position, i want to updated the fragment recyclerView.
Here, i have passed the reference of the main object in the fragment, so on success of request, it updates the main object, and the updated object will be present inside the fragment list.
Since, it's an asynchronous call, i want to show a loader and then update the fragment.
Here is where my problem lies. I am not able to update the fragment recyclerView. It's updating but taking time.
I had tried using return POSITION_NONE which worked fine, but it's not a good approach as it creates a new fragment every time.
This is my viewPagerAdapter.
public class ShowTimeViewPageAdapter extends FragmentStatePagerAdapter {
private static final String TAG = ShowTimeViewPageAdapter.class.getSimpleName();
private Context mContext;
private List<String> mDateStringList;
private FragmentManager fragmentManager;
private IShowTimeActivity mIShowTimeActivity;
private List<String> mDateCodes;
private LinkedHashMap<String, List<Venue>> mVenueHashMap;
public ShowTimeViewPageAdapter(FragmentManager fm, Context context, IShowTimeActivity showTimeActivity, List<String> createdDates, List<String> dateCodes, LinkedHashMap<String, List<Venue>> venueHashMap) {
super(fm);
this.mContext = context;
this.mIShowTimeActivity = showTimeActivity;
this.fragmentManager = fm;
this.mDateCodes = dateCodes;
this.mVenueHashMap = venueHashMap;
this.mDateStringList = createdDates;
}
private String getDateCode(int pos) {
String dateCode = null;
try {
dateCode = mDateCodes.get(pos);
} catch (IndexOutOfBoundsException e) {
Logger.d(TAG, "Index out of bound");
}
return dateCode;
}
private List<Venue> getVenuesList(String dateCode) {
return mVenueHashMap.get(dateCode);
}
#Override
public Fragment getItem(int position) {
if (getDateCode(position) != null) {
if (getVenuesList(getDateCode(position)) == null) {
if(position!=0){
mIShowTimeActivity.requestForTheVenueListByDateCode(getDateCode(position), position);
}
}
}
ShowTimeFragment showTimeFragment = ShowTimeFragment.newInstance(mDateStringList.get(position).split(";")[2]);
fragmentManager.beginTransaction().add(showTimeFragment,""+position);
return showTimeFragment;
}
#Override
public int getCount() {
return mDateStringList.size();
}
public View getTabView(int position) {
String[] dateStr = mDateStringList.get(position).split(";");
LayoutInflater layoutInflater = LayoutInflater.from(mContext);
View tabView = layoutInflater.inflate(R.layout.show_time_tab_layout, null, false);
TextViewRoboto day = (TextViewRoboto) tabView.findViewById(R.id.show_time_tab_day);
TextViewRoboto date = (TextViewRoboto) tabView.findViewById(R.id.show_time_tab_date);
day.setText(dateStr[0]);
date.setText(dateStr[1]);
return tabView;
}
}
And this is the Fragment.
public class ShowTimeFragment extends Fragment {
#Bind(R.id.show_time_fragment_recycler_view) RecyclerView mShowTimeRecyclerView;
#Bind(R.id.show_time_fragment_no_data_text_view) TextViewRoboto mShowTimeNoDataTextView;
private static LinkedHashMap<String, List<Venue>> mVenueList = ShowTimeActivity.mVenueHashMap;
private ShowTimeRecyclerViewAdapter mShowTimeRecyclerViewAdapter;
private static final String KEY_CODE = "date_key";
public ShowTimeFragment() {
}
public static ShowTimeFragment newInstance(String dateCode) {
Bundle bundle = new Bundle();
bundle.putString(KEY_CODE, dateCode);
ShowTimeFragment showTimeFragment = new ShowTimeFragment();
showTimeFragment.setArguments(bundle);
return showTimeFragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.show_time_fragment, container, false);
ButterKnife.bind(this, view);
String code = getArguments().getString(KEY_CODE);
List<Venue> venueList = mVenueList.get(code);
if (venueList != null && venueList.size() > 0) {
mShowTimeRecyclerView.setVisibility(View.VISIBLE);
mShowTimeNoDataTextView.setVisibility(View.GONE);
mShowTimeRecyclerViewAdapter = new ShowTimeRecyclerViewAdapter(venueList, getContext());
mShowTimeRecyclerView.setAdapter(mShowTimeRecyclerViewAdapter);
CustomLinearLayoutManager cl = new CustomLinearLayoutManager(getActivity(), 1, false);
mShowTimeRecyclerView.setLayoutManager(cl);
RecyclerView.OnItemTouchListener disabler = new RecyclerViewDisabler();
mShowTimeRecyclerView.addOnItemTouchListener(disabler); // disables scrolling
} else {
mShowTimeNoDataTextView.setVisibility(View.VISIBLE);
mShowTimeRecyclerView.setVisibility(View.GONE);
mShowTimeNoDataTextView.setText("NO Data Available");
}
return view;
}
public class RecyclerViewDisabler implements RecyclerView.OnItemTouchListener {
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
return true;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
}
protected void addFragment(int containerViewId, Fragment fragment, String fragmentTag) {
getActivity().getSupportFragmentManager().beginTransaction().add(containerViewId, fragment, fragmentTag).disallowAddToBackStack().commit();
}
public void onDestroyView() {
super.onDestroyView();
}
}
In the above fragment
private static LinkedHashMap<String, List<Venue>> mVenueList = ShowTimeActivity.mVenueHashMap;
this hashMap is the reference to the original hashMap, which is updated on each request.
Any kind of help or suggestions would be appreciated.
I am unable to refresh my ListView in ListFragment with new data. Instead the new data is added to the previous.
The time period is from 6AM to 5PM for each entity. Then new data is appended to the list restarting at 6AM for another entity. The data for the first entity should be cleaned before the second is added to the ListView.
Here is the code:
public class FragmentStatePagerSupport extends FragmentActivity {
static final int NUM_ITEMS = 4; //control number of fragments
MyAdapter mAdapter;
ViewPager mPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
mAdapter = new MyAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(null);
mPager.setAdapter(mAdapter);
}
//===============================================================================================
public static class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return NUM_ITEMS;
}
#Override
public Fragment getItem(int position) {
fragNumber = position;
return ArrayListFragment.newInstance(position);
}
}
//===============================================================================================
public static class ArrayListFragment extends ListFragment {
Integer mNum;
String FORMAT_LINE = "%s%7s%7s%10s%16s";
static ArrayListFragment newInstance(int num) {
ArrayListFragment f = new ArrayListFragment();
Bundle args = new Bundle();
args.putInt("num", num);
f.setArguments(args);
return f;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mNum = getArguments() != null ? getArguments().getInt("num") : 1;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_pager_list, container, false);
View tv = v.findViewById(R.id.text);
View tvd = v.findViewById(R.id.tv_description);
String title = "";
switch (mNum){
case 0:title = MyGlobals.getInstance().getToday();break;
case 1:title = MyGlobals.getInstance().getTomorrow();break;
case 2:title = MyGlobals.getInstance().getDayAfter();break;
case 3:title = MyGlobals.getInstance().getDayDayAfter();break;
}
((TextView) tv).setText(MyGlobals.getInstance().getName() + " on " + title);
((TextView) tvd).setText(String.format(FORMAT_LINE, "time", "temp", "rain", "wind", "weather"));
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
ArrayList<Data> row = Data.getRows(mNum);
ListViewAdapter adapter = new ListViewAdapter(getActivity(), row);
getListView().setAdapter(null);
getListView().setAdapter(adapter);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id) {
v.setBackgroundColor(getResources().getColor(R.color.blue));
}
}
//==============================================================================================
public static class ListViewAdapter extends ArrayAdapter<Data> {
public static class ViewHolder{
TextView time;
TextView temp;
TextView rain;
TextView wind_speed;
TextView weather;
}
public ListViewAdapter(Context context, ArrayList<Data> list) {super(context, R.layout.text_listview, list); }
#Override
public View getView(int position, View convertView, ViewGroup parent) {
Data data = getItem(position);
ViewHolder holder;
if(convertView == null){
holder=new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView=inflater.inflate(R.layout.text_listview,parent,false);
holder.time=(TextView) convertView.findViewById(R.id.time);
holder.temp=(TextView) convertView.findViewById(R.id.temp);
holder.rain=(TextView) convertView.findViewById(R.id.rain);
holder.wind_speed=(TextView) convertView.findViewById(R.id.wind);
holder.weather=(TextView) convertView.findViewById(R.id.weather);
convertView.setTag(holder);
}else{
holder=(ViewHolder) convertView.getTag();
}
holder.time.setText(data.time);
holder.temp.setText(data.temp);
holder.rain.setText(data.rain);
holder.wind_speed.setText(data.wind_speed);
holder.weather.setText(data.weather);
return convertView;
}
}
}
This last piece populates the ListView. The calls adapter.clear() and adapter.notifyDataSetChanged() does not resolve the problem.
There is a similar question from 3 years ago How update ListView in ListFragment from FragmentActivity? still without accepted response despite the 6836 views.
Thanks a Lot.
The GetRows(mNum) piece as requested:
public class Data {
public String time;
public String temp;
public String rain;
public String wind_speed;
public String weather;
public Data(String time, String temp, String rain, String wind_speed, String weather) {
this.time = time;
this.temp = temp;
this.rain = rain;
this.wind_speed = wind_speed;
this.weather = weather;
}
public static ArrayList<Data> getRows(int fragNumber) {
int mNum = fragNumber;
int size;
String myList[] = null;
ArrayList<Data> list = new ArrayList<Data>();
switch (mNum) {
case 0://Today
size = MyGlobals.getInstance().getToday("time").size();
myList = new String[size];
for (int i = 0; i < size; i++) {
String time = (String) MyGlobals.getInstance().getToday("time").get(i);
String temp = (String) MyGlobals.getInstance().getToday("temperature").get(i);
String wind_speed = (String) MyGlobals.getInstance().getToday("wind_speed").get(i);
String pop = (String) MyGlobals.getInstance().getToday("pop").get(i);
//String wind_gust = (String) MyGlobals.getInstance().getToday("wind_gust").get(i); //when null breaks code
String weather = (String) MyGlobals.getInstance().getToday("weather").get(i);
if (time.length() == 4) time = "0" + time;
if (wind_speed.length() == 1) wind_speed = "0" + wind_speed;
if (pop.length() == 1) pop = "0" + pop;
list.add(new Data(time,temp,pop,wind_speed,weather));
}
return list;
case 1://Tomorrow
...snip... same as above with pertinent variables,...
case 2://DayAfter
...snip...
case 3://DayDayAfter
...snip....
case 4:// is an error
Log.d("***error***", "list got to case 5");
}
return list;
}
}
Try this;
Before adding new list of Data to the existing list, use list.clear();
Add new Data to the list and you should have only newly added data in the list..
pass the list to your adapter class.
Notify adapter of the new data i.e. adapter.notifyDataSetChanged()
You are returning list twice in your getRows()
remove the "return list" before the case structure
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
// Clear old list here before adding new one.
if (list! = null)
{
list.clear();
}
// Add New list
list = Data.getRows(mNum);
ListViewAdapter adapter = new
ListViewAdapter(getActivity(), list);
getListView().setAdapter(adapter);
adapter.notifyDataSetChange();
}
It's because everytime you set an Adapter, it will really be added., remove all its data first before setting again so it will be like
mPager.setAdapter(null);
before doing
mPager.setAdapter(mAdapter);
First, I'll preface my question with the fact that I'm not using a CursorLoader.
I'm pulling in data from a SQLlite database to populate a listview in a ListFragment. The initial load works well, but once the data is manipulated (i.e. an addition is made to the list), the listview NEVER refreshes to show the new data. I am implementing the Loader callbacks like so:
public class BillListingFragment extends ListFragment implements LoaderManager.LoaderCallbacks<List<Bill>> {
private billListAdapter mAdapter;
private static final int LOADER_ID = 1;
private SQLiteDatabase mDatabase;
private BillsDataSource mDataSource;
private BillsStoreDatabaseHelper mDbHelper;
/**
* The fragment argument representing the fragment type (archive or outstanding)
*/
private static final String ARG_FRAGMENT_TYPE = "fragment_type";
/**
* Returns a new instance of this fragment based on type
*/
public static BillListingFragment newInstance(String type) {
// TODO: Make the fragment type an enum
BillListingFragment fragment = new BillListingFragment();
Bundle args = new Bundle();
args.putString(ARG_FRAGMENT_TYPE, type);
fragment.setArguments(args);
return fragment;
}
public BillListingFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.bill_view_layout, container, false);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mDbHelper = new BillsStoreDatabaseHelper(getActivity());
mDatabase = mDbHelper.getWritableDatabase();
mDataSource = new BillsDataSource(mDatabase);
mAdapter = new billListAdapter(getActivity(), R.layout.bill_row_layout);
setListAdapter(mAdapter);
getLoaderManager().initLoader(LOADER_ID, null, this);
}
#Override
public Loader<List<Bill>> onCreateLoader(int id, Bundle args) {
BillDataLoader loader = new BillDataLoader(getActivity(), mDataSource);
return loader;
}
#Override
public void onLoadFinished(Loader<List<Bill>> loader, List<Bill> data) {
for(Bill bill: data){
mAdapter.add(bill);
}
setListAdapter(mAdapter);
}
#Override
public void onLoaderReset(Loader<List<Bill>> loader) {
mAdapter.clear();
}
#Override
public void onDestroy() {
super.onDestroy();
mDbHelper.close();
mDatabase.close();
mDataSource = null;
mDbHelper = null;
mDatabase = null;
}
public void reload(){
getLoaderManager().restartLoader(LOADER_ID, null, this);
}
private class billListAdapter extends ArrayAdapter<Bill> {
Context context;
public billListAdapter(Context context, int resourceID){
super(context, resourceID);
this.context = context;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
convertView = getActivity().getLayoutInflater().inflate(R.layout.bill_row_layout, parent, false);
}
TextView payToField = (TextView) convertView.findViewById(R.id.nameField);
TextView dueDateField = (TextView) convertView.findViewById(R.id.overdueField);
payToField.setText(getItem(position).getPayTo());
// calculate days until due
Bill bill = getItem(position);
// TODO: Add how many days until bill in overdue field + add color
JodaTimeAndroid.init(getActivity());
DateTime dueDateDt = new DateTime(bill.getDateDue());
DateTime currentDt = new DateTime();
int daysDifference = Days.daysBetween(currentDt.toLocalDate(), dueDateDt.toLocalDate()).getDays();
// depending on what that differential looks like set text / color
if (daysDifference > 1) {
dueDateField.setText(Integer.toString(daysDifference) + " Days");
} else {
if (daysDifference == 0) {
dueDateField.setText("DUE TODAY");
} else {
if (daysDifference < 0) {
}
}
}
return convertView;
}
}
}
I have debugged my code so I know that the onLoadFinished callback is being made after the data has been manipulated. I also know that adapter contains the updated data at this point. I have tried resetting the adapter via setListAdapter(mAdatper) and every notifyDataChanged-like method I can find, but to no avail. What is going on here and how can I get the listview to update?
Hi i got the viewpager :contains one fragment with two different views inside [A] and [B]. both views contain a list view. when I scroll , list view [A] and switch to second fragment I want list view [B] also be scrolled with the same amount. I've searched that I can set onTouchListener to the listview.please find below the code i used.
viewpager adapter
public class ViewPagerAdapter extends FragmentStatePagerAdapter implements
CurrencyScrollListener {
private String nBankName;
private List<Currency> list;
private String mycode;
private CurrencyViewPager[] mFragments = new CurrencyViewPager[2];
private int mCurrentScrollPosition;
#Override
public int getItemPosition(Object object) {
// TODO Auto-generated method stub
return super.getItemPosition(object);
}
public CurrencyViewPager getCurrencyFragment(int index) {
CurrencyViewPager pager = mFragments[index];
CurrencyViewPager other = mFragments[1-index];
if (pager == null) {
if (index == 0) {
pager = new CurrencyViewPager(list, nBankName, true, mycode,
this, 0);
} else {
pager = new CurrencyViewPager(list, nBankName, false, mycode,
this, 1);
}
mFragments[index] = pager;
}
if(other!=null && other.getCurrentPosition() != pager.getCurrentPosition()) {
pager.scrollTo( other.getCurrentPosition() );
}
return pager;
}
public ViewPagerAdapter(FragmentManager fm, List<Currency> currencyList,
String name, String code) {
super(fm);
this.list = currencyList;
this.nBankName = name;
this.mycode = code;
}
#Override
public Fragment getItem(int item) {
Log.i("ViewPagerAdapter","Currency Fragment #"+item);
return getCurrencyFragment(item);
}
#Override
public int getCount() {
return 2;
}
}
}
And single fragment containing list view
public class CurrencyViewPager extends BaseFragment {
private ListView mcurrencyListview;
private GeoCurrencyService mCurrency = GeoCurrencyService.getInstance();
ButtonPressListener buttonListener;
private CurrencyAdapter mCurrencyAdapter;
private String bankName;
private boolean checkFlag;
private ProgressBar mCurrencyProgress;
private TextView mCurrencyLoading;
private List<Currency> mList;
private String recCode;
private static int Firstposition;
private final CurrencyScrollListener listener;
private final int mListViewIndex;
// constructor
public CurrencyViewPager(List<Currency> myList, String name, boolean flag,String code, CurrencyScrollListener listener, int listViewIndex) {
super();
this.mList = myList;
this.bankName = name;
this.checkFlag = flag;
this.recCode = code;
this.listener = listener;
this.mListViewIndex = listViewIndex;
}
// interface
public interface ButtonPressListener {
public void onListItemPressed(Currency object, String name,String code);
}
// attach on listener
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
buttonListener = (ButtonPressListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement onButtonPressed");
}
}
// creating the main View.
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
View view = inflater.inflate(R.layout.listbuy, container, false);
mcurrencyListview = (ListView) view.findViewById(R.id.BuyList);
mCurrencyAdapter = new CurrencyAdapter(getActivity(),
R.layout.currency_row, mList, checkFlag, getLanguage());
mcurrencyListview.setAdapter(mCurrencyAdapter);
// calling method getCurrency which take bank code as a parameter
/*getCurrency(code,null);*/
// reference to the list view of the corresponding layout
mcurrencyListview.setOnItemClickListener(new OnItemClickListener() {
// onClick on the List item
#Override
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
// getting Currency object according to the position
Currency currencyObject = mCurrencyAdapter.getItem(position);
// sending the object to the mainActivity
buttonListener.onListItemPressed(currencyObject, bankName,recCode);
}
});
return view;
}
}
First off, you should be using FragmentPagerAdapter instead of FragmentStatePagerAdapter (Look here for more information).
Now, to the question at hand.
Use the following to get the current position of ListView [A]
int index = mListA.getFirstVisiblePosition();
View v = mListA.getChildAt(0);
int top = (v == null) ? 0 : v.getTop();
And use this to set the position of ListView [B]:
mListB.setSelectionFromTop(index, top);
Look at this SO post for more information.