Myujth

Here's the full log

11-16 04:13:35.810 3555-3555/? E/AndroidRuntime: FATAL EXCEPTION: main
 Process: com.steven.test, PID: 3555
 java.lang.ClassCastException: com.steven.test.MainActivity cannot be cast to com.steven.test.providers.priceticker.currencylist.AllCurrencyListFragment$FavoritesListUpdater
 at com.steven.test.providers.priceticker.currencylist.AllCurrencyListFragment.onAttach(AllCurrencyListFragment.java:182)
 at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1372)
 at android.support.v4.app.FragmentTransition.addToFirstInLastOut(FragmentTransition.java:1188)
 at android.support.v4.app.FragmentTransition.calculateFragments(FragmentTransition.java:1071)
 at android.support.v4.app.FragmentTransition.startTransitions(FragmentTransition.java:115)
 at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2380)
 at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2338)
 at android.support.v4.app.FragmentManagerImpl.execSingleAction(FragmentManager.java:2215)
 at android.support.v4.app.BackStackRecord.commitNowAllowingStateLoss(BackStackRecord.java:649)
 at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:145)
 at android.support.v4.view.ViewPager.populate(ViewPager.java:1238)
 at android.support.v4.view.ViewPager.populate(ViewPager.java:1086)
 at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1616)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:739)
 at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:91)
 at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1361)
 at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:809)
 at android.view.View.measure(View.java:22091)
 at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1632)
 at com.duolingo.open.rtlviewpager.RtlViewPager.onMeasure(RtlViewPager.java:211)
 at android.view.View.measure(View.java:22091)
 at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
 at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:739)
 at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:91)
 at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1361)
 at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:809)
 at android.view.View.measure(View.java:22091)
 at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
 at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
 at android.view.View.measure(View.java:22091)
 at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1059)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
 at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:141)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
11-16 04:13:35.811 3555-3555/? E/AndroidRuntime: at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1514)
 at android.widget.LinearLayout.measureVertical(LinearLayout.java:806)
 at android.widget.LinearLayout.onMeasure(LinearLayout.java:685)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6602)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
 at com.android.internal.policy.DecorView.onMeasure(DecorView.java:725)
 at android.view.View.measure(View.java:22091)
 at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2447)
 at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1529)
 at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1786)
 at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1417)
 at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6934)
 at android.view.Choreographer$CallbackRecord.run(Choreographer.java:979)
 at android.view.Choreographer.doCallbacks(Choreographer.java:791)
 at android.view.Choreographer.doFrame(Choreographer.java:726)
 at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:965)
 at android.os.Handler.handleCallback(Handler.java:790)
 at android.os.Handler.dispatchMessage(Handler.java:99)
 at android.os.Looper.loop(Looper.java:164)
 at android.app.ActivityThread.main(ActivityThread.java:6578)
 at java.lang.reflect.Method.invoke(Native Method)
 at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:460)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

Here are my activities :

The fragment which starts and passes to the other fragment -

public class CurrencyListTabsFragment extends Fragment implements ViewPager.OnPageChangeListener,
 FavoriteCurrencyListFragment.AllCoinsListUpdater, AllCurrencyListFragment.FavoritesListUpdater 

 private SectionsPagerAdapterCurrencyList mSectionsPagerAdapter;
 private View rootView;
 public ViewPager mViewPager;
 public static String baseImageURL = "";
 public static String SYMBOL = "SYMBOL";
 private Toolbar mToolbar;
 public final static String DAY = "24h";
 public final static String WEEK = "7d";
 public final static String HOUR = "1h";
 public final static String SORT_SETTING = "sort_setting";
 public Fragment context;

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) 
 rootView = inflater.inflate(R.layout.activity_currency_list_tabs, container, false);
 context = this;
 mToolbar = rootView.findViewById(R.id.toolbar_currency_list);
 ((AppCompatActivity)getActivity()).setSupportActionBar(mToolbar);
 TabLayout tabLayout = rootView.findViewById(R.id.currency_list_tabs);
 mViewPager = rootView.findViewById(R.id.currency_list_tabs_container);

 mSectionsPagerAdapter = new SectionsPagerAdapterCurrencyList(getActivity().getSupportFragmentManager());
 mViewPager.setAdapter(mSectionsPagerAdapter);
 mViewPager.setOffscreenPageLimit(2);
 mViewPager.addOnPageChangeListener(this);

 tabLayout.setupWithViewPager(mViewPager);
 tabLayout.setSelectedTabIndicatorColor(Color.WHITE);

 return rootView;
 

 @Override
 public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) 

 

 @Override
 public void onPageSelected(int position) 

 Fragment fragment = mSectionsPagerAdapter.getFragment(position);
 if (fragment != null) 
 fragment.onResume();
 
 

 @Override
 public void onPageScrollStateChanged(int state) 

 

 public void removeFavorite(CMCCoin coin) 
 FavoriteCurrencyListFragment frag = (FavoriteCurrencyListFragment) mSectionsPagerAdapter.getFragment(1);
 if (frag != null) 
 frag.removeFavorite(coin);
 
 

 public void addFavorite(CMCCoin coin) 
 FavoriteCurrencyListFragment frag = (FavoriteCurrencyListFragment) mSectionsPagerAdapter.getFragment(1);
 if (frag != null) 
 frag.addFavorite(coin);
 
 

 public void allCoinsModifyFavorites(CMCCoin coin) 
 AllCurrencyListFragment frag = (AllCurrencyListFragment) mSectionsPagerAdapter.getFragment(0);
 if (frag != null) 
 frag.getAdapter().notifyDataSetChanged();
 
 

 public void performFavsSort() 
 FavoriteCurrencyListFragment frag = (FavoriteCurrencyListFragment) mSectionsPagerAdapter.getFragment(1);
 if (frag != null) 
 frag.performFavsSort();
 
 

 public void performAllCoinsSort() 
 AllCurrencyListFragment frag = (AllCurrencyListFragment) mSectionsPagerAdapter.getFragment(0);
 if (frag != null) 
 frag.performAllCoinsSort();
 
 

This is the fragment which is throwing the error in "onAttach" method

public class AllCurrencyListFragment extends Fragment implements SwipeRefreshLayout.OnRefreshListener,
 SearchView.OnQueryTextListener 

 private SwipeRefreshLayout swipeRefreshLayout;
 private RecyclerView currencyRecyclerView;
 private AllCurrencyListAdapter adapter;
 private ArrayList<CMCCoin> currencyItemList;
 private ArrayList<CMCCoin> filteredList = new ArrayList<>();
 private MenuItem searchItem;
 private SearchView searchView;
 private View rootView;
 private Context mContext;
 public static String currQuery = "";
 ArrayList<CMCCoin> searchList;
 private HashMap<String, String> searchedSymbols = new HashMap<>();
 private HashMap<String, Integer> slugToIDMap = new HashMap<>();
 public static boolean searchViewFocused = false;
 private FavoritesListUpdater favsUpdateCallback;
 private SharedPreferences sharedPreferences;

 public interface FavoritesListUpdater 
 void removeFavorite(CMCCoin coin);
 void addFavorite(CMCCoin coin);
 void performFavsSort();
 

 public AllCurrencyListFragment() 
 

 public void performAllCoinsSort() 
 int sortType = sharedPreferences.getInt(SORT_SETTING, 1);
 sortList(adapter.getCurrencyList(), sortType);
 adapter.notifyDataSetChanged();
 

 public void getQuickSearch() 
 CoinMarketCapService.getCMCQuickSearch(mContext, new afterTaskCompletion<CMCQuickSearch>() 
 @Override
 public void onTaskCompleted(CMCQuickSearch quickSearchNodeList) 
 slugToIDMap = new HashMap<>();
 Parcelable recyclerViewState;
 recyclerViewState = currencyRecyclerView.getLayoutManager().onSaveInstanceState();
 for (CMCQuickSearch node : quickSearchNodeList) 
 slugToIDMap.put(node.getSlug(), node.getId());
 
 if (searchViewFocused) 
 for (CMCCoin coin: searchList) 
 if (slugToIDMap.get(coin.getId()) != null) 
 coin.setQuickSearchID(slugToIDMap.get(coin.getId()));
 
 
 adapter.setCurrencyList(searchList);
 else 
 for (CMCCoin coin : currencyItemList) 
 if (coin.getId() != null && slugToIDMap.get(coin.getId()) != null) 
 coin.setQuickSearchID(slugToIDMap.get(coin.getId()));
 
 
 adapter.setCurrencyList(currencyItemList);
 
 int sortType = sharedPreferences.getInt(SORT_SETTING, 1);
 sortList(adapter.getCurrencyList(), sortType);
 adapter.notifyDataSetChanged();
 favsUpdateCallback.performFavsSort();
 currencyRecyclerView.getLayoutManager().onRestoreInstanceState(recyclerViewState);
 swipeRefreshLayout.setRefreshing(false);
 
 , new afterTaskFailure() 
 @Override
 public void onTaskFailed(Object o, Exception e) 
 Log.e("ERROR", "Server Error: " + e.getMessage());
 swipeRefreshLayout.setRefreshing(false);
 
 , true);
 

 @Override
 public void onRefresh() 
 getCurrencyList();
 

 public static AllCurrencyListFragment newInstance() 
 return new AllCurrencyListFragment();
 

 public void getCurrencyList() 
 swipeRefreshLayout.setRefreshing(true);
 CoinMarketCapService.getAllCoins(mContext, new afterTaskCompletion<CMCCoin>() 
 @Override
 public void onTaskCompleted(CMCCoin cmcCoinList) 
 try 
 if (searchViewFocused) // Copy some code here to make the checks faster
 searchedSymbols.clear();
 searchList.clear();
 for (CMCCoin coin : filteredList) 
 searchedSymbols.put(coin.getSymbol(), coin.getSymbol());
 
 for (CMCCoin coin : cmcCoinList) 
 if (searchedSymbols.get(coin.getSymbol()) != null) 
 searchList.add(coin);
 
 
 else 
 currencyItemList.clear();
 currencyItemList.addAll(Arrays.asList(cmcCoinList));
 
 catch (Exception e) 
 e.printStackTrace();
 
 getQuickSearch();
 
 , new afterTaskFailure() 
 @Override
 public void onTaskFailed(Object o, Exception e) 
 Log.e("ERROR", "Server Error: " + e.getMessage());
 swipeRefreshLayout.setRefreshing(false);
 
 , true);
 

 @Override
 public void onResume() 
 super.onResume();
 getActivity().invalidateOptionsMenu();
 

 @Override
 public void onAttach(Context context) 
 this.mContext = context;
 this.favsUpdateCallback = (FavoritesListUpdater) context;
 super.onAttach(context);
 

 @Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) 
 rootView = inflater.inflate(R.layout.fragment_all_currency_list, container, false);
 setHasOptionsMenu(true);
 DatabaseHelperSingleton db = DatabaseHelperSingleton.getInstance(mContext);
 sharedPreferences = getContext().getSharedPreferences(SHAREDPREF_SETTINGS, MODE_PRIVATE);
 searchList = new ArrayList<>();
 // Setup currency list
 currencyRecyclerView = rootView.findViewById(R.id.currency_list_recycler_view);
 HorizontalDividerItemDecoration divider = new HorizontalDividerItemDecoration.Builder(mContext).build();
 currencyRecyclerView.addItemDecoration(divider);
 LinearLayoutManager llm = new LinearLayoutManager(mContext);
 llm.setOrientation(LinearLayoutManager.VERTICAL);
 currencyRecyclerView.setLayoutManager(llm);
 currencyItemList = new ArrayList<>();
 adapter = new AllCurrencyListAdapter(favsUpdateCallback, currencyItemList, db, (AppCompatActivity) mContext, new CustomItemClickListener() 
 @Override
 public void onItemClick(int position, View v) 
 Intent intent = new Intent(mContext, CurrencyDetailsTabsActivity.class);
 intent.putExtra(GraphFragment.ARG_SYMBOL, adapter.getCurrencyList().get(position).getSymbol());
 intent.putExtra(GraphFragment.ARG_ID, adapter.getCurrencyList().get(position).getId());
 intent.putExtra(GraphFragment.COIN_OBJECT, adapter.getCurrencyList().get(position));
 mContext.startActivity(intent);
 
 );
 currencyRecyclerView.setAdapter(adapter);
 // Setup swipe refresh layout
 swipeRefreshLayout = rootView.findViewById(R.id.currency_list_swipe_refresh);
 swipeRefreshLayout.setColorSchemeResources(R.color.myAccentColor);
 swipeRefreshLayout.setOnRefreshListener(this);
 swipeRefreshLayout.post(new Runnable() 
 @Override
 public void run() 
 swipeRefreshLayout.setRefreshing(true);
 getCurrencyList();
 
 );
 return rootView;
 

 @Override
 public boolean onOptionsItemSelected(MenuItem item) 
 switch(item.getItemId()) 
 case R.id.sort_button:
 int sortType = sharedPreferences.getInt(SORT_SETTING, 1);
 new MaterialDialog.Builder(getActivity())
 .title(R.string.sort_by)
 .items(R.array.sort_options)
 .dividerColorRes(R.color.myPrimaryColor)
 .widgetColorRes(R.color.myPrimaryColor)
 .buttonRippleColorRes(R.color.myPrimaryColor)
 .itemsCallbackSingleChoice(sortType, new MaterialDialog.ListCallbackSingleChoice() 
 @Override
 public boolean onSelection(MaterialDialog dialog, View view, int which, CharSequence text) 
 sortList(adapter.getCurrencyList(), which);
 adapter.notifyDataSetChanged();
 SharedPreferences.Editor editor = sharedPreferences.edit();
 editor.putInt(SORT_SETTING, which);
 editor.apply();
 favsUpdateCallback.performFavsSort();
 Toast toast = Toast.makeText(getContext(), "Sorting by: " + text, Toast.LENGTH_SHORT);
 toast.show();
 return true;
 
 )
 .show();
 return true;
 default:
 return super.onOptionsItemSelected(item);
 
 

 @Override
 public boolean onQueryTextSubmit(String query) 
 return false;
 

 @Override
 public boolean onQueryTextChange(String query) 
 currQuery = query;
 query = query.toLowerCase();
 filteredList.clear();
 for (CMCCoin coin : currencyItemList) 
 if (coin.getSymbol().toLowerCase().contains(query) 
 adapter.setCurrencyList(filteredList);
 return true;
 

 private void showInputMethod(View view) 
 InputMethodManager imm = (InputMethodManager) getActivity().getSystemService(Context.INPUT_METHOD_SERVICE);
 if (imm != null) 
 imm.showSoftInput(view, 0);
 
 

 @Override
 public void onPrepareOptionsMenu(Menu menu) 
 if (searchView != null && searchViewFocused) 
 ((AppCompatActivity)mContext).getSupportActionBar().setTitle("");
 searchView.requestFocusFromTouch();
 searchView.setIconified(false);
 searchView.setIconified(false);
 searchView.setQuery(currQuery, false);
 showInputMethod(rootView);
 
 


 @Override
 public void onCreateOptionsMenu(final Menu menu, MenuInflater inflater) 
 getActivity().getMenuInflater().inflate(R.menu.all_currency_list_tab_menu, menu);
 searchItem = menu.findItem(R.id.action_search);
 searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
 searchView.setOnQueryTextListener(this);
 // Detect SearchView icon clicks
 searchView.setOnSearchClickListener(new View.OnClickListener() 
 @Override
 public void onClick(View v) 
 searchViewFocused = true;
 setItemsVisibility(menu, searchItem, false);
 
 );
 // Detect SearchView close
 searchView.setOnCloseListener(new SearchView.OnCloseListener() 
 @Override
 public boolean onClose() 
 searchViewFocused = false;
 setItemsVisibility(menu, searchItem, true);
 return false;
 
 );
 if (searchViewFocused) ((AppCompatActivity)mContext).getSupportActionBar().setTitle("");
 super.onCreateOptionsMenu(menu, inflater);
 

 private void setItemsVisibility(Menu menu, MenuItem exception, boolean visible) 
 for (int i = 0; i < menu.size(); ++i) 
 MenuItem item = menu.getItem(i);
 if (item != exception) item.setVisible(visible);
 
 if (!visible) 
 ((AppCompatActivity)mContext).getSupportActionBar().setTitle("");
 else 
 ((AppCompatActivity)mContext).getSupportActionBar().setTitle(getResources().getString(R.string.app_name));
 
 

 @Override
 public void onActivityCreated(Bundle savedInstanceState) 
 super.onActivityCreated(savedInstanceState);
 searchViewFocused = false;
 

 public AllCurrencyListAdapter getAdapter() 
 return this.adapter;
 

I've tried to look around for answers but could'nt find even one and this error is stressing me out since I can't fix it! App crashes when I try to start this fragment. Any help is appricated.

You need to have MainActivity ... implements AllCurrencyListFragment.FavoritesListUpdater

The Fragment will attach to an Activity, so in other words, at com.steven.test.providers.priceticker.currencylist.AllCurrencyListFragment.onAttach(AllCurrencyListFragment.java:182), that Activity that you have used to load this Fragment, must implement that interface.

Plus, a Fragment is not an extension of a Context object

Here are my activities

You showed two Fragments...

In public void onAttach(Context context), the context passed in seems to be of type com.steven.test.MainActivity which appears not to be compatible with com.steven.test.providers.priceticker.currencylist.AllCurrencyListFragment$FavoritesListUpdate when you try and cast it here:

 this.favsUpdateCallback = (FavoritesListUpdater) context;

I don't know what are you trying to do.

in your code, you try to cast

FavoritesListUpdater 

to Context

and that what causes the error.
I think you want to cast the context to MainActivity right?

 this.favsUpdateCallback = ((MainActivity) getActivity()).favsUpdateCallback ;

Do you want to do it like that?