Develop Reference

How to update tab title from Adapter?

I have an Activity inside the activity I have tab layout with two tabs(tab 1, tab 2). Each tab have recyclerview with list of items using Recycleradapter. I want to change the tab title when the user is clicking the recycler child item.
FYI :- I have a child clicklistener inside the adapter.
Activity code
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFragment(new Tab1Fragment(), "Tab1");
adapter.addFragment(new Tab2Fragment(), "Tab2");
viewPager.setAdapter(adapter);
}
Adapter Code
holder.parentlayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//I want to change the tab text here
});

You can get the Tab object from your TabLayout using following code and then you can apply your updated text in it:
mTabLayout.getTabAt(index).setText()

Try this way make one method for title update into viewPagerAdapter like below..
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private List<Fragment> mFragmentList = new ArrayList<>();
private List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
public void setTitle(String title)
{
mFragmentTitleList.add(title);
}
#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
public void destroyItem(ViewGroup container, int position, Object object) {
mFragmentList = null;
mFragmentTitleList = null;
container.removeAllViews();
super.destroyItem(container, position, object);
}
public void updateTitle(String title,int position){
mFragmentTitleList.set(position,title);
notifyDataSetChanged();
}
#Override
public Parcelable saveState() {
return null;
}
}
then when you update title then call below method..
mViewPagerAdapter.updateTitle("Your update title");

Not getting current selected Tab position in android tablayout

I am creating a Tab based application where the user can create tabs by clicking a button and can delete the tabs by clicking another button. I implemented this using Tab layout, Fragments and Viewpager.
I am able to get the current tab position when new tab is created by the function setuptablyout function. But when i clicked another tab ie moving to other tabs I am not able to toast the position.
I found that using tabLayout.addOnTabSelectedListener I can get the position, while that doesn't work here.
my Activity Code is:
public class MainActivity extends AppCompatActivity{
TextView textView;
private TabLayout tabLayout;
public static ViewPager viewPager;
public static ViewPagerAdapter adapter;
private ImageView add;
int selectedTabPosition;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager)findViewById(R.id.my_viewpager);
tabLayout = (TabLayout) findViewById(R.id.my_tab_layout);
add= (ImageView) findViewById(R.id.imageButtonAdd1);
adapter = new ViewPagerAdapter(getSupportFragmentManager(), MainActivity.this, viewPager, tabLayout);
viewPager.setAdapter(adapter);
createFirstFragment("POS "+adapter.getCount());
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
Toast.makeText(getApplicationContext(),"Pos onTabSelected: "+ tabLayout.getSelectedTabPosition(),Toast.LENGTH_SHORT).show();
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
add.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(adapter.getCount() > 4){
Toast.makeText(MainActivity.this, "Only 5 Tabs allowed", Toast.LENGTH_SHORT).show();
}
else {
Bundle bundle = new Bundle();
bundle.putString("data", "POS "+adapter.getCount());
FragmentChild fragmentChild = new FragmentChild();
fragmentChild.setArguments(bundle);
adapter.addFrag(fragmentChild, "POS "+adapter.getCount());
adapter.notifyDataSetChanged();
if (adapter.getCount() > 0) tabLayout.setupWithViewPager(viewPager);
Log.e("adapter.getCount()",String.valueOf(adapter.getCount()));
viewPager.setCurrentItem(adapter.getCount() - 1);
setupTabLayout();
}
}
});
}
public void createFirstFragment(String pagename) {
Bundle bundle = new Bundle();
bundle.putString("data", pagename);
FragmentChild fragmentChild = new FragmentChild();
fragmentChild.setArguments(bundle);
adapter.addFrag(fragmentChild, pagename);
adapter.notifyDataSetChanged();
if (adapter.getCount() > 0) tabLayout.setupWithViewPager(viewPager);
Log.e("adapter.getCount()",String.valueOf(adapter.getCount()));
viewPager.setCurrentItem(adapter.getCount() - 1);
setupTabLayout();
}
public void setupTabLayout() {
selectedTabPosition = viewPager.getCurrentItem();
Toast.makeText(MainActivity.this, "selectedTabPosition --> "+selectedTabPosition, Toast.LENGTH_SHORT).show();
for (int i = 0; i < tabLayout.getTabCount(); i++) {
tabLayout.getTabAt(i).setCustomView(adapter.getTabView(i));
}
}
}
ViewPager class:
public class ViewPagerAdapter extends FragmentPagerAdapter {
private final ArrayList<Fragment> mFragmentList = new ArrayList<>();
private final ArrayList<String> mFragmentTitleList = new ArrayList<>();
Context context;
ViewPager viewPager;
TabLayout tabLayout;
int selectedTabPosition;
PreferenceHelper prefs;
private Map<Integer, String> mFragmentTags;
private FragmentManager mFragmentManager;
private boolean doNotifyDataSetChangedOnce = false;
public ViewPagerAdapter(FragmentManager manager, Context context, ViewPager viewPager,
TabLayout tabLayout) {
super(manager);
this.context = context;
this.viewPager = viewPager;
this.tabLayout = tabLayout;
mFragmentTags = new HashMap<Integer, String>();
prefs = new PreferenceHelper(context);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
if (doNotifyDataSetChangedOnce) {
doNotifyDataSetChangedOnce = false;
notifyDataSetChanged();
}
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
public void removeFrag(int position) {
removeTab(position);
Fragment fragment = mFragmentList.get(position);
mFragmentList.remove(fragment);
mFragmentTitleList.remove(position);
//destroyFragmentView(viewPager, position, fragment);
notifyDataSetChanged();
Log.e("getCount()", String.valueOf(getCount()));
if (getCount() > 0)
tabLayout.setupWithViewPager(viewPager);
setupTabLayout();
}
public View getTabView(final int position) {
View view = LayoutInflater.from(context).inflate(R.layout.custom_tab_item, null);
TextView tabItemName = (TextView) view.findViewById(R.id.textViewTabItemName);
ImageView tabItemAvatar =
(ImageView) view.findViewById(R.id.imageViewTabItemAvatar);
ImageButton remove = (ImageButton) view.findViewById(R.id.imageButtonRemove);
if(getCount() == 1){
remove.setVisibility(View.INVISIBLE);
}
else{
remove.setVisibility(View.VISIBLE);
}
remove.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d("Remove", "Remove");
if(getCount() != 1){
removeFrag(position);
}
else{
// Toast.makeText("Atleast One Tab is requied")
}
}
});
tabItemName.setText(mFragmentTitleList.get(position));
tabItemName.setTextColor(context.getResources().getColor(android.R.color.background_light));
tabItemAvatar.setImageResource(R.drawable.boy);
return view;
}
public void setupTabLayout() {
selectedTabPosition = viewPager.getCurrentItem();
Toast.makeText(context, "selectedTabPosition --> "+selectedTabPosition, Toast.LENGTH_SHORT).show();
for (int i = 0; i < tabLayout.getTabCount(); i++) {
tabLayout.getTabAt(i).setCustomView(getTabView(i));
}
}
public void removeTab(int position) {
if (tabLayout.getChildCount() > 0 && tabLayout!=null) {
tabLayout.removeTabAt(position);
prefs.remove("POS"+position);
}
}
/*#Override
public void setPrimaryItem(ViewGroup container, int position, Object object) {
if (mCurrentFragment != object) {
mCurrentFragment = (Fragment) object;
}
super.setPrimaryItem(container, position, object);
}*/
#Override
public Object instantiateItem(ViewGroup container, int position) {
Object object = super.instantiateItem(container, position);
if (object instanceof Fragment) {
Fragment fragment = (Fragment) object;
String tag = fragment.getTag();
mFragmentTags.put(position, tag);
}
return object;
}
public Fragment getFragment(int position) {
Fragment fragment = null;
String tag = mFragmentTags.get(position);
if (tag != null) {
fragment = mFragmentManager.findFragmentByTag(tag);
}
return fragment;
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
I am getting this weird behaviour that whenever I create new tabs the onTabSelected functions are calling multiple time that even when I create 3rd tab onTabslected toast shows Pos onTabSelected: 0,1 and not the just 2nd position which is supposed to be the 2nd position. What can I do to solve this?
My intention is to get some unique tab id so that I can identify each tab separately

you just create the newInstance constructor for creating fragment with arguments
in your FragmentChild
public static FragmentChild newInstance(int page, String title) {
FragmentChild fragmentChild = new FragmentChild ();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
fragmentChild.setArguments(args);
return fragmentChild;
}
// Store instance variables based on arguments passed
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
TextView tvLabel = (TextView) view.findViewById(R.id.tvLabel);
tvLabel.setText(page + " -- " + title);
return view;
}
And then after in adapter class change this.
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
to
#Override
public Fragment getItem(int position) {
return FragmentChild.newInstance(position, "Page # 1");
}
I have not tested this code but, I think this code will help you to get your unique tab id..
test this code and let me know if it works

I want to refresh my tab fragment every time though my tab is already selected

I use View-pager to set tab. inside category tab when i click any category load data from internet and i hide all category and data load inside recycleview. but now when I click on category tab I want to visible before view. note please : I want to click same tab and every time it need refresh. please check the image for better understand. Please check my adopter class.
viewPager = (CustomViewPager) findViewById(R.id.tabs_viewpager);
// viewPager.setPagingEnabled(false);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabFragmentPagerAdapter = new TabFragmentPagerAdapter(getSupportFragmentManager(), MainActivity.this, viewPager);
tabFragmentPagerAdapter.addFrag(new FeatureFragment(), "Feature");
tabFragmentPagerAdapter.addFrag(new DiscoverFragment(), "Discover");
tabFragmentPagerAdapter.addFrag(new TopFragment(), "Top");
tabFragmentPagerAdapter.addFrag(new CategoryFragment(), "Category");
// setupViewPager(viewPager);
viewPager.setAdapter(tabFragmentPagerAdapter);
My Adopter class
public class TabFragmentPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mfragmentlist = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
FragmentManager fragmentManager;
final int[] ICONS = new int[]{
R.drawable.feature,
R.drawable.discover,
R.drawable.top,
R.drawable.category};
public Context context;
public ViewPager viewPager;
public TabFragmentPagerAdapter(FragmentManager fm, Context context, ViewPager viewPager) {
super(fm);
this.context = context;
this.viewPager = viewPager;
this.fragmentManager = fm;
}
public View getTabView(int position) {
// Given you have a custom layout in `res/layout/custom_tab.xml` with a TextView and ImageView
View v = LayoutInflater.from(context).inflate(R.layout.custom_tab, null);
final TextView tv = (TextView) v.findViewById(R.id.textViewMainTabFrag);
tv.setText(mFragmentTitleList.get(position));
ImageView img = (ImageView) v.findViewById(R.id.imgView);
img.setImageResource(ICONS[position]);
return v;
}
public void SetOnSelectView(TabLayout tabLayout, int position) {
TabLayout.Tab tab = tabLayout.getTabAt(position);
View selected = tab.getCustomView();
TextView iv_text = (TextView) selected.findViewById(R.id.textViewMainTabFrag);
iv_text.setTextColor(context.getResources().getColor(R.color.apps_color));
}
public void SetUnSelectView(TabLayout tabLayout, int position) {
TabLayout.Tab tab = tabLayout.getTabAt(position);
View selected = tab.getCustomView();
TextView iv_text = (TextView) selected.findViewById(R.id.textViewMainTabFrag);
iv_text.setTextColor(context.getResources().getColor(R.color.black));
}
public void addFrag(Fragment fragment, String title) {
mfragmentlist.add(fragment);
mFragmentTitleList.add(title);
}
/* #Override
public Fragment getItem(int position) {
return ItemFragment.newInstance();
}*/
#Override
public Fragment getItem(int position) {
return mfragmentlist.get(position);
}
#Override
public int getCount() {
return mFragmentTitleList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
main activity OnTabSelectedListener here will be good option to reload activity. but how and how to visible my view
#Override
public void onTabUnselected(TabLayout.Tab tab) {
int c = tab.getPosition();
tabFragmentPagerAdapter.SetUnSelectView(tabLayout, c);
}

you can use setUserVisibleHint :
In your fragment:
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser){
//do something //Load or Refresh Data
}
}
OR
In your Activity:
viewPager.addOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// do something //Load or Refresh Data
}
});
check this solutions

Try this ...
public class ListCanali extends Fragment implements OnPageChangeListener{
private MyAdapter mAdapter;
#Override
public View OnCreateView (...) {
...
if(mAdapter == null) {
mAdapter = new MyAdapter(getChildFragmentManager());
}
viewPager.setAdapter(mAdapter);
viewPager.setOnPageChangeListener(this);
...
}
#Override
public void OnPageSelected (int position) {
switch (position){
case 0 :
((FragmentCanali)adapter.getItem(position)).refresh();
case 1 :
((FragmentPreferiti)adapter.getItem(position)).refresh();
}
}

Fragments not being loaded using PagerAdapter [ANDROID]

In my app i am using pager adapter to load 2 fragments, the fragments are not getting loaded and view pager remains null. Where i am going wrong? Any help will be appreciated
Here is my code
I am setting this adapter to my view pager from activity
public class ViewPagerActivityAdapter extends PagerAdapter {
ArrayList<Fragment> tablist;
public ViewPagerActivityAdapter(ArrayList<Fragment> tablist) {
this.tablist = tablist;
}
#Override
public int getCount() {
return tablist.size();
}
#Override
public boolean isViewFromObject(View view, Object object) {
return false;
}
#Override
public Object instantiateItem(ViewGroup collection, int position) {
return null;
}
#Override
public void destroyItem(ViewGroup collection, int position, Object view) {
}
}
Activity Part
private ViewPagerActivityAdapter viewPagerAdapter;
private ArrayList<Fragment> fragments_faq;
fragments_faq = new ArrayList<>();
FragmentOne frag1 = new FragmentOne();
tablayout.addTab(tablayout.newTab().setText("fragone"));
fragments_faq.add(frag1);
FragmentTwo frag2 = new FragmentTwo();
tablayout.addTab(tablayout.newTab().setText("fragtwo"));
fragments_faq.add(frag2);
private void setPagerAdapter() {
viewPagerAdapter = new ViewPagerActivityAdapter(fragments_faq);
viewpager.setAdapter(viewPagerAdapter);
viewpager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tablayout));
viewpager.setOffscreenPageLimit(2);
tablayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewpager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}

#Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
for details check this gist
https://gist.github.com/vinay6kr/33359c3f3b0e9f28e33bd383b01e9d9f

if you want to show fragments in viewpager you should use FragmentStatePagerAdapter
public class MyViewPagerAdapter extends FragmentStatePagerAdapter {
CharSequence Titles[];
public MyViewPagerAdapter(FragmentManager fm, CharSequence mTitles[]) {
super(fm);
this.Titles = mTitles;
}
#Override
public Fragment getItem(int position) {
if (position == 0)
return new Fragment1().getInstance();
else if (position == 1)
return new Fragment2().getInstance();
}
#Override
public CharSequence getPageTitle(int position) {
return Titles[position];
}
#Override
public int getCount() {
return Titles.length;
}
}
and to Set them
void setUpTabs() {
String Titles[] = {"Frag1","Frag2"};
MyViewPagerAdapter adapter = new MyViewPagerAdapter(this.getSupportFragmentManager(), Titles);
viewPager.setAdapter(adapter);
}

You can try like adapter look like
class ViewPagerActivityAdapter extends FragmentPagerAdapter {
// fragments to instantiate in the viewpager
private List<Fragment> fragments;
// constructor
public ViewPagerActivityAdapter(FragmentManager fm,List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
// return access to fragment from position, required override
#Override
public Fragment getItem(int position) {
return this.fragments.get(position);
}
// number of fragments in list, required override
#Override
public int getCount() {
return this.fragments.size();
}
}
Add Fragment
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this,
FragmentOne.class.getName()));
fragments.add(Fragment.instantiate(this,
FragmentTwo.class.getName()));
Add to view Pager
ViewPagerActivityAdapter mPagerAdapter;
this.mPagerAdapter = new ViewPagerActivityAdapter(
super.getSupportFragmentManager(), fragments);
mPager = (ViewPager) super.findViewById(R.id.pager);
mPager.setAdapter(this.mPagerAdapter);

You should use FragmentPagerAdapter or FragmentStatePagerAdapter for this.Here is sample code.
public class ViewPagerActivityAdapter extends FragmentPagerAdapter {
ArrayList<Fragment> tablist;
public ViewPagerActivityAdapter(ArrayList<Fragment> tablist) {
this.tablist = tablist;
}
#Override
public int getCount() {
return tablist.size();
}
#Override
public Fragment getItem(int position) {
return tablist.get(position);
}
}

How can I remove a fragment and tab from ViewPager and Tablayout?

I have search a lot about this solution. I tried remove from mFragmentList and mFragmentTitleList directly. And I also tried call the destroyItem. Many methods have been tried. None of them worked. I have been stuck on this problem for few days. Is there Any answer could help? Thanks.
public final class OrdersViewPagerAdapter extends android.support.v4.app.FragmentPagerAdapter{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public OrdersViewPagerAdapter(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 void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
if (position <= getCount()) {
FragmentManager manager = ((Fragment) object).getFragmentManager();
FragmentTransaction trans = manager.beginTransaction();
trans.remove((Fragment) object);
trans.commit();
}
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public void removeView(String title, ViewGroup view, TabLayout tabLayout) {
int index=-1;
int count=mFragmentTitleList.size();
for (int i=0;i<count;i++){
String mtitle=mFragmentTitleList.get(i);
if (mtitle.equals(title)){
index=i;
break;
}
}
if (index!=-1) {
mFragmentTitleList.remove(index);
tabLayout.removeTabAt(index);
destroyItem(view,index,mFragmentList.get(index));
notifyDataSetChanged();
}
}
}