My app's activity hierarchy is:
MainActivity > FragActivity > FragmentExp(It includes 3 tab fragment(Tab1 Tab2 Tab3))
I have recycler view in MainActivity and when clicked in different list I want to go to Tabs with extrastrings(I mean some string message). And, show toast in those tabs.
What I've tried is:
I set intent with extrastring from my MainActivity to FragActivity like this.
if (position==1){
Intent i = new Intent(MainActivity.this, FragActivity.class);
i.putExtra(MainActivity.ENGLISHPDF, "0");
startActivity(i);
}
and get those strings directly in Tab1 and Tab2 like this:
In Tab1
code = getActivity().getIntent().getStringExtra(MainActivity.ENGLISHPDF);
if (this.code.equals("0")) {
Toast.makeText(getContext(), "hey its 1", Toast.LENGTH_SHORT).show();
}
In Tab2
code = getActivity().getIntent().getStringExtra(MainActivity.ENGLISHPDF);
if (this.code.equals("0")) {
Toast.makeText(getContext(), "hey its 2", Toast.LENGTH_SHORT).show();
}
These are my codes:
MainActivity:
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, DataAdapter.OnNoteListener{
public static final String ENGLISHPDF = "english";
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
(...)
recyclerView = findViewById(R.id.add_header);
(...)
ArrayList<ListItem> items = new ArrayList<>();
items.add(new Item(R.drawable.green, "English", "1"));
DataAdapter adapter = new DataAdapter(items, this);
recyclerView.setAdapter(adapter);
}
#Override
public void onNoteClick(int position) {
if (position==0){
Intent i = new Intent(MainActivity.this, FragActivity.class);
i.putExtra(MainActivity.ENGLISHPDF, "0");
startActivity(i);
}
}
}
FragActivity:
public class FragActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_frag);
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container,
new FragmentExplorem(), COLLAPSING_TOOLBAR_FRAGMENT_TAG).commit();
}
And finally in FragExp I've set tablayout and include 3 tabs fragment in it.
This is FragExp:
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_layout, container, false);
AppBarLayout appBarLayout = view.findViewById(R.id.tab_appbar_layout);
((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).setBehavior(new AppBarLayoutBehavior());
tabLayout = view.findViewById(R.id.tabs);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);
viewPager = view.findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(tab_count);
toolbar = view.findViewById(R.id.toolbar);
setupToolbar();
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(0);
}
});
return view;
}
public class MyAdapter extends FragmentPagerAdapter {
private MyAdapter(FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0: return new Tab1();
case 1: return new Tab2();
case 2: return new Tab3();
}
return null;
}
#Override
public int getCount() {
return tab_count;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0 : {
return "First";
}
case 1 : {
return "Second";
}
case 2 : {
return "Third";
}
return null;
}
}
Get fragment instance like following function.
This way of getting instance ensures all the clients need the
instance have the same process of constructing the Fragment.
public class Tab1 extends Fragment {
private static final String KEY_CODE = "key_code";
public static Fragment newInstance(#Nullable String code) {
Bundle args = new Bundle(1);
if (code!= null)
args.putString(KEY_CODE, code);
Tab1 fragment = new Tab1();
fragment.setArguments(args);
return fragment;
}
}
when you need Tab1 instance, you should pass the parameter or null at the same time.
#Override
public Fragment getItem(int position) {
switch (position) {
case 0: return Tab1.newInstance(code);
case 1: return Tab2.newInstance(code);
case 2: return Tab3.newInstance(code);
}
return null;
}
Then you can use the code by invoking Fragment.getArguments().
// In Tab1
private String mCode;
private String DEFAULT_CODE = "0";
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mCode = getArguments().getString(KEY_CODE , DEFAULT_CODE);
// Now you can use the mCode in any place in Tab1 you want, but make sure you do Null check before using it
}
BTW, if the "code" is dynamic, then it will be totally different.
Related
so i got one main activity that has a Tablayout and a ViewPager to present diffrent fragments.
when i move between the fragments with my Tablayout everything works good, but if i use a button to open fragment, when going back to the former fragment (by pushing the cancel button) the elements of the fragment i left staying on the screen (as in the picture).
i tried to use a method viewPager.setCurrentItem(0); in the fragment to go back to the homepage from the fragment instade of ft.replace(R.id.fragment_edit_reminder, new Main_Activity_fragment()).commit(); but it didn't moved back to my home fragment (with the repalce it does go back but as i saied the elements.
this is my main:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TabLayout tableLayout = findViewById(R.id.Tablayouting);
final ViewPager viewPager = findViewById(R.id.ViewPager);
PagerAdapter pagerAdapter = new
PagerAdapter(getSupportFragmentManager(),tableLayout.getTabCount());
viewPager.setAdapter(pagerAdapter);
tableLayout.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) {
}
});
}
}
this is the fragment:
public class edit_reminder_fragment extends Fragment implements View.OnClickListener {
private Button cancelButton;
public edit_reminder_fragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #return A new instance of fragment edit_reminder_fragment.
*/
public static edit_reminder_fragment newInstance() {
edit_reminder_fragment fragment = new edit_reminder_fragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
}
}
#RequiresApi(api = Build.VERSION_CODES.O)
public void onClick(View view)//TODO: make a utility method for switching fragments on the main_activity_fragment(see note).
{
switch (view.getId()) {//recognizing what button was pushed
case R.id.ButtonCancelReminder:
//region
FragmentTransaction ft = getFragmentManager().beginTransaction();
Main_Activity_fragment maf = new Main_Activity_fragment();
ft.replace(R.id.fragment_edit_reminder, maf).commit();
break;
//endregion
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_edit_reminder_fragment, container, false);
cancelButton = view.findViewById(R.id.ButtonCancelReminder);
cancelButton.setOnClickListener(this);
return view;
}
}
my pagerAdapted class:
public class PagerAdapter extends FragmentPagerAdapter {
//https://www.youtube.com/watch?v=HHd-Fa3DCng&ab_channel=MasterCoding
private int numOfTabs;
public PagerAdapter(FragmentManager fm, int numOfTabs) {
super(fm);
this.numOfTabs = numOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Main_Activity_fragment();
case 1:
return new key_words_fragment();
case 2:
return new groups_and_points_fragment();
case 3:
return new Fragment_Past_Reminders();
case 4:
return new edit_reminder_fragment();
default:
return null;
}
}
#Override
public int getCount() {
return numOfTabs;
}
}
in the picture we see the home page fragment ,on it 3 buttons (cancel, save, Add a sub reminder) that stayed from a fragment that open when clicking on the ADD NEW REMINDER button (when clicking on cancel in the second fragment it's going back to the home page):
First, try the following as an adaper:
public class PagerAdapter extends
FragmentPagerAdapter {
private final ArrayList<Fragment> mFragments = new ArrayList<>();
private final ArrayList<String> mFragmentTitle = new ArrayList<>();
public PagerAdapter(FragmentManager mManager) {
super(mManager);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitle.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitle.get(position);
}
public Fragment getFragment(int position) {
if (position < mFragments.size() && position >= 0) {
return mFragments.get(position);
}
return null;
}
}
Then in your MainActivity's onCreate, initialize the following:
mTabs = (TabLayout) findViewById(R.id.tabs);
mPager = (ViewPager) findViewById(R.id.view_pager);
mMainAdapter = new PagerAdapter( getSupportFragmentManager() );
setupContents();
Then the private method setupContents() as follows:
mMainAdapter.addFragment(new FragmentOne(), getResources().getString(R.string.tab_albums));
mMainAdapter.addFragment(new FragmentTwo(), getResources().getString(R.string.tab_songs));
mMainAdapter.addFragment(new FragmentThree(), getResources().getString(R.string.tab_playlists));
// you can add as many fragments as you wish
//just follow the previous method #mMainAdapter.addFragment
mPager.setAdapter(mMainAdapter);
mTabs.setupWithViewPager(mPager);
To get the current fragment:
public Fragment getCurrentFragment() {
return mMainAdapter.getFragment(mPager.getCurrentItem());
}
To check if the current fragment is FragmentOne:
private boolean isFragmentOne() {
return getCurrentFragment() instanceof FragmentOne;
}
Problem:
I'm trying to open a custom dialog after pressing a button in my tabbed fragment.
It's seems like my MainActivity activity is sent to the dialog while i want my tabbed fragment(GroupFragment) to be sent so i can change the editText(for now) in this fragment.
Code:
public class GroupFragment extends Fragment implements AddGroupDialog.AddGroupDialogListener {
private Button addGroupButton;
private TextView textViewNoGroups;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_group, container, false);
addGroupButton = view.findViewById(R.id.addGroupButton);
textViewNoGroups = view.findViewById(R.id.textViewNoGroups);
addGroupButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
addNewGroupDialog();
}
});
scaleAnimation(addGroupButton);
return view;
}
private void scaleAnimation(View v){
Animator scale = ObjectAnimator.ofPropertyValuesHolder(v,
PropertyValuesHolder.ofFloat(View.SCALE_X, 0, 1.2f, 1),
PropertyValuesHolder.ofFloat(View.SCALE_Y, 0, 1.2f, 1)
);
scale.setDuration(600);
scale.start();
}
private void addNewGroupDialog(){
AddGroupDialog dialog = new AddGroupDialog();
assert getFragmentManager() != null;
dialog.show(getFragmentManager(), "add new group dialog");
}
#Override
public void applyString(String groupName) {
textViewNoGroups.setText(groupName);
}
}
public class AddGroupDialog extends AppCompatDialogFragment {
private EditText editTextGroupName;
private AddGroupDialogListener listener;
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.layout_add_new_group_dialog, null);
builder.setView(view)
.setTitle("")
.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
String groupName = editTextGroupName.getText().toString();
listener.applyString(groupName);
}
});
editTextGroupName = view.findViewById(R.id.editTextGroupName);
return builder.create();
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
try {
listener = (AddGroupDialogListener) context;
} catch (ClassCastException e){
throw new ClassCastException(context.toString() +
"Must implement AddGroupDialogListener");
}
}
public interface AddGroupDialogListener{
void applyString(String groupName);
}
}
public class MainActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
#StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
private final Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position){
case 0:
fragment = new GroupFragment();
break;
case 1:
fragment = new AttendanceFragment();
break;
case 2:
fragment = new StatisticsFragment();
break;
}
return fragment;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
#Override
public int getCount() {
return TAB_TITLES.length;
}
}
Error:
java.lang.ClassCastException: com.example.attendencetaker.MainActivity#26602bcMust implement AddGroupDialogListener
I hope my explanation of the problem is clear. Thank you!
Make the activity implement your interfaces and so on and then pass all data to the fragment with an method on the fragment. You will need an reference to actual Fragment that is displayed.
In your fragment add a method similar to this:
public void updateData(String data) {
editText.setText(data);
}
And in the override method of the interface in your activity to this:
#Override
public void update(String data) {
fragment.updateData(data);
}
Update
Use this Adapter instead:
public class SectionTabAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> fragments = new ArrayList<>();
private ArrayList<String> titles = new ArrayList<>();
public SectionTabAdapter(#NonNull FragmentManager fm, int behavior) {
super(fm, behavior);
}
public void addFragment(Fragment fragment, String title) {
fragments.add(fragment);
titles.add(title);
}
#NonNull
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
#Override
public int getCount() {
return fragments.size();
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
In your activity then do this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionTabAdapter = new SectionTabAdapter(this, getSupportFragmentManager());
Fragment groupFragment = new GroupFragment();
Fragment attendanceFragment = new AttendanceFragment();
Fragment statisticsFragment = new StatisticsFragment();
sectionTabAdapter.addFragment(groupFragment, context.getString(R.string.title_1);
sectionTabAdapter.addFragment(attendanceFragment, context.getString(R.string.title_2);
sectionTabAdapter.addFragment(statisticsFragment, context.getString(R.string.title_3);
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionTabAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
I have created an android app in which I have added an activity called profileview.java on which users can view there or other user's profile data. Profileview activity contains two fragments post and likes on which I have to show the post that is been posted by the user and the post liked by the user but not getting any idea how to send the userid from the profileview activity to the other two fragments.
profileviewactivity.class
public class profileviewActivity extends AppCompatActivity {
public String userid;
private ViewPager viewPager;
private TabLayout tabLayout;
private settingtabAdopter Tabadapter;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_profileview);
viewPager = (ViewPager) findViewById(R.id.viewpager);
Tabadapter = new settingtabAdopter(getSupportFragmentManager());
viewPager.setAdapter(Tabadapter);
tabLayout = (TabLayout) findViewById(R.id.tablayout);
tabLayout.setupWithViewPager(viewPager);
userid = getIntent().getExtras().get("userid").toString();
}
}
settingadapter.java
public class settingtabAdopter extends FragmentPagerAdapter {
public settingtabAdopter(#NonNull FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
posttimeline postfragment = new posttimeline();
return postfragment;
case 1:
like chatfragment = new like();
return chatfragment;
default:
return null;
}
}
#Override
public int getCount() {
return 2;
}
#Nullable
#Override
public CharSequence getPageTitle(int i) {
switch (i){
case 0:
return "Posts";
case 1:
return "Likes";
default:
return null;
}
}
}
posttimeline.java
public class posttimeline extends Fragment {
View posttimelineview;
public posttimeline() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
posttimelineview = inflater.inflate(R.layout.fragment_posttimeline, container, false);
return posttimelineview;
}
}
like.java
public class like extends Fragment {
View Likeview;
public like() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
Likeview = inflater.inflate(R.layout.fragment_like, container, false);
return Likeview;
}
}
i want to send userid from the profileaviewactivity to the posttimeline and like fragment.
pass userid as parameter at settingtabAdopter constructor
public settingtabAdopter(#NonNull FragmentManager fm, String userid)
profileviewActivity -> onCreate
Tabadapter = new settingtabAdopter(getSupportFragmentManager(), userid);
make private variable inside settingtabAdopter
private String userid;
initialize it inside constructor
this.userid = userid
Create private variable in each fragment and add setter (posttimeline and like) fragments
private String mUserid;
void setMUserId(String mUserid){
this.mUserid = mUserid;
}
On settingtabAdopter inside getItem function after initialize each fragment set the private varaible with the userid
public Fragment getItem(int position) {
switch (position){
case 0:
posttimeline postfragment = new posttimeline();
postfragment.setMUserId(userid)
return postfragment;
case 1:
like chatfragment = new like();
chatfragment.setMUserId(userid)
return chatfragment;
default:
return null;
}
}
I want to hide a GridView by setting drawerGrid.setVisibility(View.GONE); when the ViewPager is on a specific layout. Do I need to implement a onPageListener or is there an easier option?
Launcher.java
public class Launcher extends FragmentActivity {
DrawerAdapter drawerAdapterObject;
GridView drawerGrid;
class Package {
Drawable icon;
String name;
String label;
}
Package[] packs;
PackageManager pm;
ViewPager viewpager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_launcher);
drawerGrid = (GridView) findViewById(R.id.content);
pm=getPackageManager();
set_packs();
drawerAdapterObject = new DrawerAdapter(this, packs);
drawerGrid.setAdapter(drawerAdapterObject);
viewpager = (ViewPager) findViewById(R.id.pager);
PagerAdapter adapter = new PagerAdapter(getSupportFragmentManager());
viewpager.setAdapter(adapter);
viewpager.setCurrentItem(1);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
Window w = getWindow();
w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
}
}
public void set_packs() {
final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
List<ResolveInfo> packsList = pm.queryIntentActivities(mainIntent, 0);
packs = new Package[packsList.size()];
for(int I=0;I<packsList.size();I++){
packs[I]= new Package();
packs[I].icon=packsList.get(I).loadIcon(pm);
packs[I].name=packsList.get(I).activityInfo.packageName;
packs[I].label=packsList.get(I).loadLabel(pm).toString();
}
}
PagerAdapter.java
public class PagerAdapter extends FragmentPagerAdapter {
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
switch (arg0) {
case 0:
return new Fragment1();
case 1:
return new Fragment2();
default:
break;
}
return null;
}
#Override
public int getCount() {
return 2;
}
}
Fragment1.java
public class Fragment1 extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_apps,container,false);
}
}
Fragment2.java
public class Fragment2 extends Fragment {
ViewPager viewpager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_homescreen,container,false);
}
}
You can do that in two ways:
As you mentioned by using addOnPageChangedListener
Using callback when your fragment become visible to user
How to determine when Fragment becomes visible in ViewPager:
try this;
public class MyFragment extends Fragment {
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
//hide view here
}
else {
}
}
}
setUserVisibleHint
Set a hint to the system about whether this fragment's UI is currently visible to the user. This hint defaults to true and is persistent across fragment instance state save and restore.
here isVisibleToUser boolean: returns true if this fragment's UI is currently visible to the user (default), false if it is not.
I have three tabs using the implementation below and they perform very well. When tab is changed the proper fragment is load and so on. The problem is that, when i get to the last tab and comeback to the first fragment, its like its oncreateview method is always triggered again running the other codes it in causing duplicates. Any help will be greatly appreciated.
//Activity on the tab is based
public class Dashboard extends AppCompatActivity {
private TabLayout tabLayout;
private ViewPager viewPager;
private MyViewPagerAdapter myViewPagerAdapter;
private int[] tabIcon = {R.drawable.ic_home, R.drawable.ic_message, R.drawable.ic_person};
android.support.v7.widget.Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.dashboard);
//Toolbar
toolbar = (android.support.v7.widget.Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//ViewPager
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
//Tablayout
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.getTabAt(0).setIcon(tabIcon[0]);
tabLayout.getTabAt(1).setIcon(tabIcon[1]);
tabLayout.getTabAt(2).setIcon(tabIcon[2]);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
switch(tab.getPosition()) {
case 0:
viewPager.setCurrentItem(0);
toolbar.setTitle("Home");
break;
case 1:
viewPager.setCurrentItem(1);
toolbar.setTitle("Messages");
break;
case 2:
viewPager.setCurrentItem(2);
toolbar.setTitle("Profile");
break;
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void setupViewPager(ViewPager viewPager){
myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.addFragments(new CategoryFragment(), "Categories");
myViewPagerAdapter.addFragments(new MessagesFragment(), "Messages");
myViewPagerAdapter.addFragments(new ProfileFragment(), "Profile");
viewPager.setAdapter(myViewPagerAdapter);
}
//View Pager Adapter
public class MyViewPagerAdapter extends FragmentPagerAdapter {
ArrayList<Fragment> fragments = new ArrayList<>();
ArrayList<String> tabTitles = new ArrayList<>();
public void addFragments(Fragment fragments, String titles){
this.fragments.add(fragments);
this.tabTitles.add(titles);
}
public MyViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public int getCount() {
return fragments.size();
}
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
#Override
public CharSequence getPageTitle(int position) {
//return tabTitles.get(position);
return null;
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
//Main first fragment code
public class CategoryFragment extends Fragment {
private DBHandler dbHandler;
private ListView listView;
private ListAdapter adapter;
ArrayList<Categories> categoriesList = new ArrayList<Categories>();
public CategoryFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_home, container, false);
//Setting up the basic categories
dbHandler = new DBHandler(view.getContext());
//Get Categories from database
final Cursor cursor = dbHandler.getCategories(0);
if (cursor != null) {
if(cursor.moveToFirst()){
do{
Categories categories = new Categories();
categories.set_id(cursor.getInt(0));
categories.set_categoryname(cursor.getString(2));
categories.set_categoriescaption(cursor.getString(3));
categoriesList.add(categories);
}while (cursor.moveToNext());
}
cursor.close();
}
listView = (ListView) view.findViewById(R.id.categories);
adapter = new CategoryAdapter(view.getContext(), R.layout.cursor_row, categoriesList);
listView.setAdapter(adapter);
listView.setOnItemClickListener(
new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Integer cid = (int) (long) adapter.getItemId(position);
TextView categoryname = (TextView) view.findViewById(R.id.cursor);
String cname = categoryname.getText().toString();
Intent i = new Intent(view.getContext(), CategoryList.class);
i.putExtra("categoryname", cname);
i.putExtra("categoryid", cid);
startActivity(i);
}
}
);
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
}
So when i swipe back here from the last tab. OncreateView runs again. How can i handle that and prevent duplicates. Thank you
By defaults ViewPager retains only 1 page in the view hierarchy in an idle state.So when you swipe to third tab the viepager destroys the first tab in order to retain the second one.
To solve this issue add this line
viewPager.setOffscreenPageLimit(3);
after you set your adapter.
Check here the documentation for more