I have an activity that has two fragments. The activity has a custom toolbar and the remaining space on the screen is used by the fragments (one at a time). In this toolbar there is a SearchView.OnQueryTextListener but this search should always be available in the fragment 1 and for the fragment 2 if should be available only if it meets a criteria. So what I need is a way to check, everytime I switch from fragments which one if occupying the screen at the moment and if it's the fragment one I set the searchView as available and for the fragment 2 the searchView will be available only if it meets the criteria.
This is my Activity:
public class ActivityTeams extends BaseActivity implements SearchView.OnQueryTextListener {
public ActivityTeams(){
super(R.layout.activity_teams);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
token = SharedPrefsHelper.getString(getApplicationContext(), Constants.TOKEN);
listview = (ListView) findViewById(R.id.listview);
listview.setVisibility(View.INVISIBLE);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
appBarLayout = (AppBarLayout) findViewById(R.id.appBarLayout);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new InternsFragment(), getResources().getString(R.string.team_internal));
adapter.addFragment(new ExternsFragment(), getResources().getString(R.string.team_external));
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
#Override
protected void initToolbar() {
toolbar = (Toolbar) findViewById(R.id.toolbar);
if(toolbar!=null) {
if (user_type == 1) {
toolbar.setTitle(R.string.collaborators_title);
} else if (user_type == 2) {
toolbar.setTitle(R.string.admin_title);
}
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
toolbar.setNavigationIcon(R.drawable.ic_action_back_black);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_search_team, menu);
SearchManager searchManager = (SearchManager)
getSystemService(Context.SEARCH_SERVICE);
searchMenuItem = menu.findItem(R.id.search);
searchView = (SearchView) searchMenuItem.getActionView();
ImageView searchSubmit = (ImageView) searchView.findViewById (android.support.v7.appcompat.R.id.search_go_btn);
searchSubmit.setImageResource(R.drawable.ic_dots_w);
searchSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//Clear query
searchView.setQuery("", false);
//Collapse the action view
searchView.onActionViewCollapsed();
//Collapse the search widget
searchMenuItem.collapseActionView();
listview.setVisibility(View.GONE);
viewPager.bringToFront();
appBarLayout.setVisibility(View.VISIBLE);
}
});
for (TextView textView : findChildrenByClass(searchView, TextView.class)) {
textView.setTextColor(Color.BLACK);
textView.setHintTextColor(Color.BLACK);
}
searchView.setSearchableInfo(searchManager.
getSearchableInfo(getComponentName()));
searchView.setSubmitButtonEnabled(true);
searchView.setOnQueryTextListener(this);
return true;
}
This is fragment 1:
public class InternsFragment extends Fragment{
public InternsFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_interns, container, false);
return rootView;
}
And this is fragment 2:
public class ExternsFragment extends Fragment {
public ExternsFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_externs, container, false);
return rootView;
}
searchMenuItem in my activity is the thing I want to make change the visibility depending on the fragment that it's visible.
Use a ViewPager.OnPageChangeListener and use InvalidateOptionsMenu() inside that like so:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
currentFragment = position // use a field to store position
invalidateOptionsMenu();
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
}
});
Then depending on position, setup your menu in onPrepareOptionsMenu
Related
I have an application in which I create TabItems dynamically and I add them to the TabLayout. I'll show you the code below. then I also have a mechanism that when a tabitem is created, the user can close it with a click of a button. NOW: the problem happens here. when the user deletes that tabitem and program automatically directs the user to another tab. I can no longer click on the other tabs that I created at the start of the application. I Can click on them, but the program closes with the error
java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 4, found: 3 Pager
and all of this happens when I delete a tabitem with a code written for a click. below is my MainActivity.java code :
public class MainActivity extends AppCompatActivity implements ContactsFragment.CallBacks, UserDetailFragment.DetailCallBacks {
android.support.v7.widget.Toolbar toolbar;
public static List<Fragment> fragments = new ArrayList<>();
public static List<String> fragmentsTitle = new ArrayList<>();
ViewPager viewPager;
TabLayout tabLayout;
int tabposition_number;
public List<Fragment> getFragments() {
return fragments;
}
public List<String> getFragmentsTitle() {
return fragmentsTitle;
}
public void addToFragments(Fragment fragment) {
fragments.add(fragment);
}
public void addToFragmentsTitle(String title) {
fragmentsTitle.add(title);
}
public Fragment getFragmentsWithPosition(int position) {
return fragments.get(position);
}
public String getFragmentsTitleWithPosition(int position) {
return fragmentsTitle.get(position);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = new MenuInflater(this);
menuInflater.inflate(R.menu.top_main_menu,menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.remove_tab) {
remove_tab_details(3);
}
return super.onOptionsItemSelected(item);
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page_drawer);
this.tabLayout = findViewById(R.id.tab_layout);
this.viewPager = findViewById(R.id.view_pager);
tabLayout.setupWithViewPager(viewPager);
SetUpViewPager(viewPager);
this.toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
NavigationView navigationView = findViewById(R.id.navigation_view);
navigationView.setItemIconTintList(null);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){
#Override
public void onTabSelected(TabLayout.Tab tab) {
if(tab.getPosition() > 2) {
tabposition_number = tab.getPosition();
}
// viewPager.setCurrentItem(tab.getPosition());
if(tab.getPosition() == 1) {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_contacts));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_contacts));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_contacts));
}
} else if(tab.getPosition() == 2) {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_register));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_register));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_register));
}
} else {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_signin));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_signin));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_signin));
}
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
}
public void SetUpViewPager(ViewPager viewPager) {
MyViewPagerAdapter Adapter = new MyViewPagerAdapter((getSupportFragmentManager()));
Adapter.AddFragmentPage(new SignInFragment(),"ورود");
Adapter.AddFragmentPage(new ContactsFragment(),"ارتباطات");
Adapter.AddFragmentPage(new RegisterFragment(),"ثبت نام");
Adapter.notifyDataSetChanged();
viewPager.setAdapter(Adapter);
}
#Override
public void create_user_detail_tab(UserObject userObject) {
MyViewPagerAdapter Adapter = new MyViewPagerAdapter(getSupportFragmentManager());
UserDetailFragment userDetailFragment = new UserDetailFragment();
Bundle bundle = new Bundle();
bundle.putString("name",userObject.getName());
bundle.putString("family",userObject.getFamily());
bundle.putString("email",userObject.getEmail());
userDetailFragment.setArguments(bundle);
Adapter.AddFragmentPage(userDetailFragment,userObject.getName());
viewPager.setAdapter(Adapter);
TabLayout.Tab tab = tabLayout.getTabAt(1);
tab.select();
}
#Override
public void delete_previous_tab(int tabposition_number) {
remove_tab_details(tabposition_number);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
}
#Override
public void changeTabItem(boolean mustdelete) {
ContactsFragment contactsFragment = new ContactsFragment();
if(tabposition_number > 2 && mustdelete) {
contactsFragment.setTextView(tabposition_number,mustdelete);
TabLayout.Tab tab = tabLayout.getTabAt(1);
tab.select();
}
}
public class MyViewPagerAdapter extends FragmentPagerAdapter {
public MyViewPagerAdapter(FragmentManager manager) {
super(manager);
}
public void removeTabPage(int position) {
fragments.remove(position);
fragmentsTitle.remove(position);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
myViewPagerAdapter.notifyDataSetChanged();
}
public void AddFragmentPage(Fragment frag,String title) {
MainActivity.this.addToFragments(frag);
MainActivity.this.addToFragmentsTitle(title);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
}
public Fragment getItem(int position) {
return MainActivity.this.getFragmentsWithPosition(position);
}
public CharSequence getPageTitle(int position) {
return MainActivity.this.getFragmentsTitleWithPosition(position);
}
public int getCount() {
return fragments.size();
}
}
public void remove_tab_details(int tab_to_delete) {
// TabLayout.Tab tab = tabLayout.getTabAt(2);
// tab.select();
tabLayout.removeTabAt(tab_to_delete);
MyViewPagerAdapter Adapter = new MyViewPagerAdapter(getSupportFragmentManager());
Adapter.removeTabPage(tab_to_delete);
Adapter.notifyDataSetChanged();
}
}
and the code for UserDetailFragment ( which creates when the user click on one of the items in a listview fragment .
public class UserDetailFragment extends Fragment {
View view;
DetailCallBacks detailCallBacks;
public UserDetailFragment() {}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.user_detail_fragment,null);
return view;
}
#Override
public void onResume() {
super.onResume();
final Bundle bundle = getArguments();
String name = (String) bundle.get("name");
String family = (String)bundle.get("family");
String email = (String)bundle.get("email");
TextView nameFamilytv = view.findViewById(R.id.user_detail_name_and_family);
String nameAndfamily = name + " " + family;
nameFamilytv.setText(nameAndfamily);
TextView emailtv = view.findViewById(R.id.user_detail_email);
emailtv.setText(email);
Button closebtn = view.findViewById(R.id.detail_close_button);
closebtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
detailCallBacks.changeTabItem(true);
}
});
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
detailCallBacks = (DetailCallBacks)context;
}
public interface DetailCallBacks {
public void changeTabItem(boolean mustdelete);
}
and last but not least : the code for that list item that creates dynamic tabs when user clicks on its items :
public class ContactsFragment extends ListFragment {
CallBacks callBacks;
View view;
public static int came_fromTabItem;
public static boolean do_delete;
public ContactsFragment() { }
ArrayList<UserObject> userObjects;
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
userObjects = intent.getParcelableArrayListExtra(Intent_Service.SERVICE_PAYLOAD);
ArrayAdapter<UserObject> userObjectArrayAdapter = new UserArrayAdapter(context,0,userObjects);
setListAdapter(userObjectArrayAdapter);
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(getActivity(), Intent_Service.class);
getActivity().startService(intent);
LocalBroadcastManager.getInstance(getActivity().getApplicationContext()).
registerReceiver(broadcastReceiver,new IntentFilter(Intent_Service.SERVICE_MESSAGE));
}
public void setTextView(int position,Boolean mustDelete) {
came_fromTabItem = position;
do_delete = mustDelete;
}
#Override
public void onResume() {
super.onResume();
if(came_fromTabItem > 2 && do_delete) {
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
callBacks.delete_previous_tab(came_fromTabItem);
do_delete = false;
Toast.makeText(getActivity().getApplicationContext(),String.valueOf(came_fromTabItem),Toast.LENGTH_LONG).show();
}
}, 2000);
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
this.view = inflater.inflate(R.layout.fragment_contacts,null);
return this.view;
}
public void onListItemClick(ListView l, View v, int position, long id) {
UserObject userObject = userObjects.get(position);
callBacks.create_user_detail_tab(userObject);
}
public interface CallBacks {
public void create_user_detail_tab(UserObject userObject);
public void delete_previous_tab(int positions);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.callBacks = (CallBacks)context;
}
}
So... can anyone help me please? the problem is simple, why the error The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 4, found: 3 appears when a tabitem is removed, how can I solve it?
the problem occur because you delete a tab item and your pager still has 4 in item count , you have to make pager item count dynamic , and call notifyDataSetChanged() after you remove an item
here is an example
public class MyPagerAdapter extends FragmentPagerAdapter {
int nbrItem;
public ProfilPagerAdapter(FragmentManager fm,String token,Int nbrItem) {
super(fm);
this.nbrItem= nbrItem;
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0 :
new SignInFragment();
case 1 :
new ContactsFragment()
case 2 :
new RegisterFragment()
}
return null;
}
#Override
public int getCount() {
return nbrItem;
}
public void setNbrItem(int nbrItem) {
this.nbrItem= nbrItem;
}
now when you remove an item you will pass to new number of item to your adapater
getAdapter().setNbrItem(2);
getAdapter().notifyDataSetChanged();
I solved my Problem, But with a hack, you see the error was because: TabItems are counting and indexing from 0, but as my pages are dynamically creating, I set the
getCount() method of my FragmentPagerAdapter to return the ArrayList<Fragment> fragments size , with fragments.size() , on the other hand, the size of an ArrayList doesn't count 0. so for 3 elements, instead of 0 1 2, or number 2, it returns to number 3.
so back to business, I was compelled to add null to my ArrayList and one null to my ArrayList titles, so this way when I removed my last TabItem, program doesn't crash anymore, and to be more convenient, when a user closes all Tabs , everytime user opens ( adds ) a new tab, I call fragments.removeAll(Collections.singleton(null)); to clear every null element i have inserted, for the TabTitles Too .
anyway cheers you guys, I'm sure this would be a good tutorial for those who want to create such applications because I've included all of my codes. please give a thumbs up. thanks.
I have Navigation drawer.and in First fragmant of Navigation drawer there is viewpager and there is information coming from network.Viewpager has 2 fragments also.When I switch fragment to Settings fragment of navigation drawer and coming back to this fragment everything is gone..There is no any information..How can i save state of this fragment?Or in which method can i send request to take information from network again
MainActivity
public class MainActivity extends AppCompatActivity implements
NavigationView.OnNavigationItemSelectedListener {
private DrawerLayout drawer;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.motherFragments, FragmentMainPage.newInstance("MainPage"))
.commit();
}
#Override
public void onBackPressed() {
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home: {
drawer.openDrawer(GravityCompat.START);
break;
}
}
return super.onOptionsItemSelected(item);
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
Fragment fragment = null;
if (item.isChecked()) {
drawer.closeDrawer(GravityCompat.START);
return false;
}
switch (item.getItemId()) {
case R.id.home: {
fragment = new FragmentMainPage().newInstance("Sample");
break;
}
case R.id.settings:{
Intent intent = new Intent(this,SettingsActivity.class);
startActivity(intent);
break;
}
case R.id.incoming:{
fragment = new FragmentIncomingPage().newInstance("Sample");
break;
}
}
if (fragment != null) {
getSupportFragmentManager()
.beginTransaction().replace(R.id.motherFragments, fragment)
.commit();
item.setChecked(true);
}
drawer.closeDrawer(GravityCompat.START);
return true;
} }
Fragment1 of Navigation drawer
public class FragmentMainPage extends Fragment implements
ViewPager.OnPageChangeListener {
private Toolbar toolbar;
private MainActivity activity;
private TabLayout tabLayout;
private ViewPager viewPager;
String[] names = {
"Sample 1",
"Sample 2"
};
private static FragmentMainPage myInstance;
public static FragmentMainPage newInstance(String testString){
Bundle bundle = new Bundle();
bundle.putString("test",testString);
if(myInstance == null){
myInstance = new FragmentMainPage();
}
myInstance.setArguments(bundle);
return myInstance;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
activity = ((MainActivity) context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_fragment_main,container,false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
activity.setSupportActionBar(toolbar);
activity.setTitle(getResources().getText(R.string.bosh_sahifa));
activity.getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
setupViewpager(viewPager);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
viewPager.addOnPageChangeListener(this);
setupTabName();
return view;
}
private void setupViewpager(ViewPager viewPager) {
MyAdapter adapter = new MyAdapter(getActivity().getSupportFragmentManager());
adapter.addFragement(new Fragment_home1());
adapter.addFragement(new Fragment_home2());
viewPager.setAdapter(adapter);
}
private void setupTabName() {
tabLayout.getTabAt(0).setText(names[0]);
tabLayout.getTabAt(1).setText(names[1]);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
private class MyAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragement(Fragment fragment){
mFragmentList.add(fragment);
}
}
}
Fragment 2 of Navigation drawer
public class FragmentIncomingPage extends Fragment {
private Toolbar toolbar;
private MainActivity activity;
private static FragmentIncomingPage myInstance;
public static FragmentIncomingPage newInstance(String testString){
Bundle bundle = new Bundle();
bundle.putString("test",testString);
if(myInstance == null){
myInstance = new FragmentIncomingPage();
}
myInstance.setArguments(bundle);
return myInstance;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
activity = ((MainActivity) context);
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_fragment_incoming,container,false);
toolbar = (Toolbar) view.findViewById(R.id.toolbar);
activity.setSupportActionBar(toolbar);
activity.setTitle(getResources().getText(R.string.Incoming));
activity.getSupportActionBar().setHomeAsUpIndicator(R.drawable.ic_menu_white_24dp);
activity.getSupportActionBar().setDisplayHomeAsUpEnabled(true);
return view;
}
}
Have 3 fragments and swipe to 3rd fragment then back to 1st fragment, the 1st fragment's data is gone?
You can use fragment.addToBackStack(null) method.
like,
FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
ft.replace(R.id.content_frame, A);
ft.addToBackStack(null);
ft.commit();
There is few ways to achieve it.
You can use SharedPreferences to save current Fragment by mViewPager.getCurrentItem() and set it again once you come to the ViewPager activity by navigation drawer button.
Use BaseFragment and implement your fragments from the Base Fragment, keep current visible fragment of the view pager in side the Base Fragment as protected variable.
As Base Fragment which is describe above, You can use Bas Activity class.
I have 2 Tabs as fragments in a ViewPager in an Activity
When I tap the second tab in the layout, the OnTabUnselected method works.
However, when I slide the screen from one tab to another, the method isn't called.
How do I achieve this calling of method by both means "Tapping as well as in a Sliding Gesture"
My Activity class is:
public class OrderActivity extends AppCompatActivity {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
private FloatingActionButton printAction;
ViewPagerAdapter adapter;
private Boolean exit = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_icon_text_tabs);
TypefaceUtil.overrideFont(getApplicationContext(), "serif", "fonts/opensans.tff");
//TypefaceUtil.overrideFont(getApplicationContext(), "arial", "fonts/opensans.tff");
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
//setupTabIcons();
printAction = (FloatingActionButton) findViewById(R.id.float_print);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
Toast.makeText(getApplicationContext(),"onTabSelected",Toast.LENGTH_LONG).show();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
String ac = null;
int pos = viewPager.getCurrentItem();
Fragment activeFragment = adapter.getItem(pos);
if(pos==0){
ac= ((PersonalDetailFragment)activeFragment).getXmlValue();
}
Toast.makeText(getApplicationContext(),ac,Toast.LENGTH_LONG).show();
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
Toast.makeText(getApplicationContext(),"onTabReselected",Toast.LENGTH_LONG).show();
}
});
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new PersonalDetailFragment(), "Personal");
adapter.addFrag(new OrderItemsFragment(), "Invoice");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
Fragment A:
public class FragmentA extends Fragment {
private EditText custName;
public PersonalDetailFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.personal_detail_fragment, container, false);
custName = (EditText) view.findViewById(R.id.customerContactEditText);
return view;
}
public String getXmlValue(){
return custName.getText().toString();
}
}
Fragment B:
public class FragmentB extends Fragment {
private EditText contactNo;
public PersonalDetailFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.personal_detail_fragment, container, false);
contactNo = (EditText) view.findViewById(R.id.customerContactEditText);
return view;
}
}
You can use the ViewPager.addOnPageChangeListener() method to register a listener and get notified about changing the current tab with a pager swipe.
There is a really nice tutorial here.
In your fragment you can use a method named setVisibilityHint that is called every time the visibility of the fragment has been changed. There is a boolean parameter that can be true or false depending if the fragment is visible or not
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
}
I am using ViewPager inside my Navigation Drawer all are works fine in devices other than marshmallow devices. in marshmallow devices when i clicking toggle button or swiping the navigation drawer (in both direction) feel a stuck(glitch) in the flow, also when i swipe the viewpager into different tabs also found the stuckking. This was found only in marshmallow device. please help me,, thanks in advance....
this is my code
activity class
public class HomeActivity extends AppCompatActivity{
Toolbar toolbar;
DrawerLayout drawerLayout;
ActionBarDrawerToggle actionBarDrawerToggle;
FragmentTransaction fragmentTransaction;
NavigationView navigationView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
toolbar = (Toolbar)findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
drawerLayout = (DrawerLayout)findViewById(R.id.drawer_layout);
actionBarDrawerToggle = new ActionBarDrawerToggle(this,drawerLayout,toolbar,R.string.drawer_open,R.string.drawer_close);
drawerLayout.addDrawerListener(actionBarDrawerToggle);
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.add(R.id.main_container,new HomeViewPagerFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Home");
navigationView = (NavigationView)findViewById(R.id.navigation_view);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.home:
fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.main_container,new HomeViewPagerFragment());
fragmentTransaction.commit();
getSupportActionBar().setTitle("Home");
item.setChecked(true);
drawerLayout.closeDrawers();
break;
}
return true;
}
});
}
#Override
protected void onPostCreate(#Nullable Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
actionBarDrawerToggle.syncState();
}
}
ViewPager fragment
public class HomeViewPagerFragment extends Fragment {
ArrayList<Model> mArrayList= new ArrayList<>();
Model model;
TabLayout tabLayout;
ViewPager viewPager;
HomeViewPagerAdapter viewPagerAdapter;
public HomeViewPagerFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home_view_pager,container,false);
viewPager = (ViewPager)rootView.findViewById(R.id.view_pager);
// parsing and add datas into mArrayList
viewPagerAdapter = new HomeViewPagerAdapter(getActivity().getSupportFragmentManager(),mArrayList);
viewPager.setAdapter(viewPagerAdapter);
viewPager.setOffscreenPageLimit(2);
// Give the TabLayout the ViewPager
viewPager.setCurrentItem(Credentials.homeTabSelected);
tabLayout = (TabLayout)rootView.findViewById(R.id.sliding_tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){
#Override
public void onTabSelected(TabLayout.Tab tab){
Credentials.homeTabSelected = tab.getPosition();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return rootView;
}
}
viewpager adapter
public class HomeViewPagerAdapter extends FragmentStatePagerAdapter {
ArrayList<Model> mArrayList = new ArrayList<>();
String tabTitles[] = new String[] { "tab1","tab2" };
public HomeViewPagerAdapter(FragmentManager fm, ArrayList<Model> arrayList) {
super(fm);
mArrayList = arrayList;
}
#Override
public Fragment getItem(int position) {
if(position==0) {
return new HomeCentralFragment();
}
else {
return HomeRecyclerFragment.newInstance(mArrayList);
}
}
#Override
public int getCount() {
return tabTitles.length;
}
#Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}
HomeCentralFragment
public class HomeCentralFragment extends Fragment {
public HomeCentralFragment(){
}
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home_central,null);
//my code is here(buttons, click events etc...)
return rootView;
}
}
HomeRecyclerFragment
public class HomeRecyclerFragment extends Fragment {
RecyclerView recyclerView;
public static ArrayList<Model> mArrayList =new ArrayList<>();
Fragment fragment;
FragmentTransaction fragmentTransaction;
public static HomeRecyclerFragment newInstance(ArrayList<Model> arrayList){
HomeRecyclerFragment fragment = new HomeRecyclerFragment();
mArrayList = arrayList;
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home_recycler_view,null);
recyclerView = (RecyclerView)rootView.findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
//to make horizontal or vertical listview using recyclerview
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
RecyclerView.Adapter adapter = new HomeRecyclerAdapter(getActivity(), mArrayList);
recyclerView.setAdapter(adapter);
recyclerView.addOnItemTouchListener(new RecyclerView.OnItemTouchListener() {
GestureDetector gestureDetector = new GestureDetector(getContext(), new GestureDetector.SimpleOnGestureListener() {
#Override public boolean onSingleTapUp(MotionEvent e) {
return true;
}
});
#Override
public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
View child = rv.findChildViewUnder(e.getX(), e.getY());
if(child != null && gestureDetector.onTouchEvent(e)) {
Credentials.selectedPolititian = rv.getChildAdapterPosition(child);
Intent intent = new Intent(getContext(), PersonDetailActivity.class);
intent.putExtra("Class","HomeActivity");
intent.putExtra("array",mArrayList);
startActivity(intent);
getActivity().finish();
}
return false;
}
#Override
public void onTouchEvent(RecyclerView rv, MotionEvent e) {
}
#Override
public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {
}
});
return rootView;
}
}
HomeRecyclerAdapter
public class HomeRecyclerAdapter extends RecyclerView.Adapter<HomeRecyclerAdapter.ViewHolder> {
private ArrayList<Model> profiles;
Context mContext;
public HomeRecyclerAdapter(Context context, ArrayList<Model> profile) {
this.profiles = profile;
this.mContext = context;
}
#Override
public HomeRecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.row_fragment_home_recycler, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(HomeRecyclerAdapter.ViewHolder viewHolder, int i) {
viewHolder.name.setText(profiles.get(i).getmName());
int length= profiles.get(i).getmDepartment().size();
int k;
String res ="";
for (k=0;k<length;k++){
res = res + profiles.get(i).getmDepartment().get(k)+"\n";
}
viewHolder.department.setText(res);
}
#Override
public int getItemCount() {
return profiles.size();
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public int getItemViewType(int position) {
return position;
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView name, department;
//private ImageView imageView;
public ViewHolder(View view) {
super(view);
// imageView = (ImageView) view.findViewById(R.id.image);
name = (TextView) view.findViewById(R.id.p_name);
department = (TextView) view.findViewById(R.id.p_department);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int pos = getAdapterPosition();
}
});
}
}
}
check view fragments layout, avoid .jpeg images (use .png images)...
check the view pager with some simple fragments, if it work smoothly check the layout views..
EDIT: I have found the solution.
I was casting the interface in a wrong way.
It should be:
( (IOnResultObtainedListener) adapter.getItem(i)).onResultObtained(response.getCompetition());
Instead of:
((IOnResultObtainedListener) CompetitionActivity.this).onResultObtained(response.getCompetition());
}
I have a ViewPager which contains three Fragments with a list. I need to populate them with the data I obtain when my webservice response but I don't know how to notify each Fragment. I have tried to implement an Interface between Activity and Fragments but I obtain this error:
java.lang.ClassCastException:
com.cuatroochenta.mybets.home.mygames.newGame.CompetitionActivity
cannot be cast to
com.cuatroochenta.mybets.home.mygames.newGame.IOnResultObtainedListener
Here is my Activity code:
public class CompetitionActivity extends MyBetsActionBarActivity implements ICompetitionsResponseListener {
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
Handler handler;
IOnResultObtainedListener onResultObtainedListener;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Competiciones");
setSupportActionBar(toolbar);
handler = new Handler();
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
#Override
public void onResume() {
super.onResume();
doRequestCompetitions();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.search_menu, menu);
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchManager searchManager = (SearchManager) this.getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = null;
if (searchItem != null) {
searchView = (SearchView) searchItem.getActionView();
}
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(this.getComponentName()));
}
return super.onCreateOptionsMenu(menu);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new PopularsFragment(), "Populares");
adapter.addFragment(new CategoriesFragment(), "Categorías");
adapter.addFragment(new NewsFragment(), "Nuevos");
viewPager.setOffscreenPageLimit(3);
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
private void doRequestCompetitions(){
if (NetworkUtils.isNetworkAvailable(this)) {
CompetitionsService competitionsService = new CompetitionsService();
competitionsService.setServiceUrl(url);
competitionsService.getCompetitionsAsync(new CompetitionsRequest(user, password), this);
} else {
InfoAlertManager.showInfoDialog(this, "Conexión requerida", "Aceptar");
}
}
#Override
public void onCompetitionsResponse(final CompetitionsResponse response) {
if (response.getCompetition() != null) {
Log.d("onCompetitionsResponse", response.getCompetition().toString());
// HERE IS WHEN I RECEIVE THE RESPONSE AND I SHOULD NOTIFY IT TO THE FRAGMENTS
handler.post(new Runnable() {
#Override
public void run() {
((IOnResultObtainedListener) CompetitionActivity.this).onResultObtained(response.getCompetition());
}
});
}
}
#Override
public void onError(ServiceResponseError serviceResponseError) {
Log.d("ServiceResponseError", serviceResponseError.getMessage());
}
public void setOnResultObtainedListener(IOnResultObtainedListener onResultObtainedListener){
this.onResultObtainedListener = onResultObtainedListener;
}
}
And here one of my Fragments code:
public class PopularsFragment extends Fragment implements IOnResultObtainedListener {
RecyclerView rvPopular;
CompetitionAdapter mCompetitionAdapter;
public PopularsFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.d("PopularsFragment", "onCreate");
}
#Override
public void onStart() {
super.onStart();
Log.d("MyBets", "PopularsFragment Visible");
}
#Override
public void onResume() {
super.onResume();
((CompetitionActivity)getActivity()).setOnResultObtainedListener(this);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_competitions, container, false);
rvPopular = (RecyclerView) rootView.findViewById(R.id.rvCompetitions);
rvPopular.setLayoutManager(new LinearLayoutManager(getActivity()));
rvPopular.setHasFixedSize(true);
return rootView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
#Override
public void onResultObtained(Competition competition) {
mCompetitionAdapter = new CompetitionAdapter(getActivity(), competition, 0);
rvPopular.setAdapter(mCompetitionAdapter);
}
}
Any ideas? I have searched for similar questions but I haven't found anything that works...
Hope you help me. Thanks a lot!
An Interface which your CompetitionActivity implements is not IOnResultObtainedListener but ICompetitionsResponseListener. Those which implement IOnResultObtainedListener are Fragments under the ViewPager.
The instances of the Fragments are held as mFragmentList by ViewPagerAdapter. So change its modifier to default (or public) that you can access it from outside of the class.
final List<Fragment> mFragmentList = new ArrayList<>();
Also you have to keep the ViewPagerAdapter instance to a field variable instead of a local one to access it out side of the setupViewPager method:
private ViewPagerAdapter pagerAdapter;
private void setupViewPager(ViewPager viewPager) {
pagerAdapter = new ViewPagerAdapter(getSupportFragmentManager());
...
}
Then, instead of this line:
((IOnResultObtainedListener) CompetitionActivity.this).onResultObtained(response.getCompetition());
place this code:
for (Fragment fragment : pagerAdapter.mFragmentList) {
((IOnResultObtainedListener) fragment).onResultObtained(response.getCompetition());
}
to call each of the Fragments' listeners.
Probably, easiest would be to use an open source event bus such as Otto