Why is my tab layout for android not working?

Why is my tab layout for android not working? - android

I am trying to make a tab sliding activity for my app but I am not able to find what is going wrong.
Here is the code for the tab activity:
public class TabActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tab);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
ViewPager viewPager = findViewById(R.id.container);
viewPager.setAdapter(new SectionsPagerAdapter(getSupportFragmentManager()));
TabLayout tabLayout = findViewById(R.id.tabs);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager));
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_tab, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static abstract class LayoutFragment extends Fragment {
private final int layout;
public LayoutFragment(#LayoutRes int layout) {
this.layout = layout;
}
#Override
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(layout, container, false);
}
#RequiresApi(api = Build.VERSION_CODES.KITKAT)
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}
public static class Fragment1 extends LayoutFragment {
public Fragment1() {
super(R.layout.fragment_one);
}
}
public static class Fragment2 extends Fragment {
public Fragment2() {
super(R.layout.fragment_two);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
switch (position) {
case 0:
return new Fragment1();
default:
return new Fragment2();
}
}
#Override
public int getCount() {
return 2;
}
}
}
The code is compiling perfectly but the tabs for fragment1 and fragment2 are not appearing at all.
I am not able to figure out what's going wrong and where, I would appreciate any help.
Edit:
Here is my XML code:
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/main_content"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/wallpaper"
android:fitsSystemWindows="true"
tools:context=".TabActivity">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:title="#string/app_name">
</androidx.appcompat.widget.Toolbar>
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.tabs.TabItem
android:id="#+id/tabItem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/tab1" />
<com.google.android.material.tabs.TabItem
android:id="#+id/tabItem2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/tab2" />
</com.google.android.material.tabs.TabLayout>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />

I think you forget to set up your view pager with tabs try this one.
ViewPager viewPager = findViewById(R.id.container);
viewPager.setAdapter(new SectionsPagerAdapter(getSupportFragmentManager()));
TabLayout tabLayout = findViewById(R.id.tabs);
tablayout.setUpWithViewPager(viewPager);

try this
tabLayout.setupWithViewPager(viewPager);
and remove this lines
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(viewPager));
EDIT
try to using LinearLayout instead of android.support.design.widget.CoordinatorLayout
EDIT
try this
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/tab_bg"
app:tabGravity="fill"
app:tabIndicatorHeight="2dp"
app:tabMode="fixed" />
</android.support.design.widget.AppBarLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#color/colorAccent" />
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</LinearLayout>
and in activity do this
private void init(){
ViewPager viewPager = v.findViewById(R.id.viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = v.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setTabMode(TabLayout.MODE_FIXED);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
TextView tab1 = (TextView) ((LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.custom_tab, null, false);
TextView tab2 = (TextView) ((LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.custom_tab, null, false);
tabLayout.getTabAt(0).setCustomView(tab1);
tabLayout.getTabAt(1).setCustomView(tab2);
}
private void setupViewPager(final ViewPager viewPager) {
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());
viewPager.setOffscreenPageLimit(3);
viewPager.setAdapter(viewPagerAdapter);
}
public class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public Fragment getItem(int position) {
if(position == 0) return new Fragment1();
if(position == 1) return new Fragment2();
throw new IllegalStateException("Unexpected position " + position);
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
if(position == 0) return "Fragment 1";
if(position == 1) return "Fragment 2";
throw new IllegalStateException("Unexpected position " + position);
}
}
here is custom_tab.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView
android:id="#+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />

Related

Same fragments in one TabLayout

I am trying to develop one activity, which contains TabLayout, which is build using one Fragment, but used a few times (same layout, different data). But when I have such a configuration, my app doesn't even go inside of getItem() method and doesn't show up my layout. Any ideas where is the problem?
My code:
Activity:
public class IndoorArenaActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_arena);
TabLayout tabLayout = findViewById(R.id.tabs);
final ViewPager viewPager = findViewById(R.id.viewPager);
final PageAdapterArena adapter = new PageAdapterArena
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addTab(tabLayout.newTab().setText("today"));
tabLayout.addTab(tabLayout.newTab().setText("tomorrow"));
tabLayout.addTab(tabLayout.newTab().setText("13/11"));
tabLayout.addTab(tabLayout.newTab().setText("14/11"));
tabLayout.addTab(tabLayout.newTab().setText("15/11"));
tabLayout.addTab(tabLayout.newTab().setText("16/11"));
tabLayout.addTab(tabLayout.newTab().setText("17/11"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setOnTabSelectedListener(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 boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
// if (id == R.id.action_settings) {
// return true;
// }
return super.onOptionsItemSelected(item);
}
}
Adapter:
public class PageAdapterArena extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PageAdapterArena(FragmentManager fm, int NumOfTabs) {
super(fm);
this.mNumOfTabs = NumOfTabs;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch(position){
case 0:
fragment = IndoorArenaFragment.newInstance();
break;
}
return fragment;
}
#Override
public int getCount() {
return mNumOfTabs;
}
}
Fragment:
public class IndoorArenaFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.indoor_arena_fragment, container, false);
}
public static Fragment newInstance() {
IndoorArenaFragment fragment = new IndoorArenaFragment();
return fragment;
}
}
Layout for activity:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".IndoorArena.IndoorArenaActivity">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
app:tabMode="scrollable"/>
<android.support.v4.view.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="#id/tab_layout" />
Layout for fragment:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="7:00"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="50dp"
android:text="Olga (Gatsby)"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="8:00"
android:textAppearance="?android:attr/textAppearanceLarge" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:padding="20dp"
android:text="9:00"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
App doesn't show up any errors, only the fragment looks like this:
And I would like to show up like this (each fragment):

You're actually passing in NumOfTabs of 0 when you create the adapter, that's why you're getting an empty view in the ViewPager, and getItem not being called. To fix this, you just need to move your adapter creation line after adding the tabs:
TabLayout tabLayout = findViewById(R.id.tabs);
ViewPager viewPager = findViewById(R.id.viewPager);
tabLayout.addTab(tabLayout.newTab().setText("today"));
tabLayout.addTab(tabLayout.newTab().setText("tomorrow"));
tabLayout.addTab(tabLayout.newTab().setText("13/11"));
tabLayout.addTab(tabLayout.newTab().setText("14/11"));
tabLayout.addTab(tabLayout.newTab().setText("15/11"));
tabLayout.addTab(tabLayout.newTab().setText("16/11"));
tabLayout.addTab(tabLayout.newTab().setText("17/11"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
// Create adapter after adding the tabs
PageAdapterArena adapter = new PageAdapterArena(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));

How to add ViewPager in Fragment Class?

I am trying to add View Pager in Fragment Class. I have tried all stuff.
public class MessageFragment extends android.support.v4.app.Fragment{
private ViewPager viewPager;
private TabLayout tabLayout;
public static MessageFragment newInstance() {
MessageFragment fragment = new MessageFragment();
Log.d("Click", "newInstance: ");
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_message, container, false);
ViewPager viewPager=(ViewPager)view.findViewById(R.id.viewpager);
if(viewPager!=null)
{
setUpViewPager(viewPager);
}
TabLayout tabLayout = (TabLayout)view. findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setTabTextColors(getResources().getColorStateList(R.color.colorToolbar));
return view;
}
private void setUpViewPager(ViewPager viewPager)
{
Adapter adapter=new Adapter(getActivity().getSupportFragmentManager());
adapter.addFragment(new TabTaskFragment(),"Tasks");
adapter.addFragment(new TabChatFragment(),"Chat");
viewPager.setAdapter(adapter);
}
static class Adapter extends FragmentPagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public Adapter(FragmentManager fm) {
super(fm);
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitles.add(title);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
}
}
Here is my xml file, I have added all viewpager code over here
please find
XML FILE:
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:visibility="gone"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/white"
app:tabIndicatorColor="#color/colorToolbar"
app:tabTextAppearance="#android:style/TextAppearance.Widget.TabWidget"
app:tabTextColor="#color/colorToolbar" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
How can I add?
I am not able to fix it.
Tabs will show 1st time, but when the user clicks on any bottom tab than tabs description gone and its show blank screens.
I have tried all stuffs disappointed at last.

Your class file should like this
public class ViewPagerFragment extends Fragment {
ViewPager viewPager;
PagerAdapter mPagerAdapter;
TabLayout tabLayout;
#Override
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.myLayout, null);
viewPager = (ViewPager) view.findViewById(R.id.transactions_recharge);
mPagerAdapter = new ViewPagerAdapter(getChildFragmentManager(), 7);
viewPager.setAdapter(mPagerAdapter);
tabLayout = (TabLayout) view.findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
return view;
}
class ViewPagerAdapter extends FragmentPagerAdapter {
int pageCount = 0;
String titles[] = {"One", "Two", "Three"};
ViewPagerAdapter(FragmentManager manager, int _pageCount) {
super(manager);
pageCount = _pageCount;
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
//load fragment one
return new FragmentOne();
} else if (position == 1) {
//load fragment two
} else if (position == 2) {
//load fragment three
}
}
#Override
public int getCount() {
return pageCount;
}
#Override
public CharSequence getPageTitle(int position) {
return titles[position];
}
}
}
And your XML should me like this.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:id="#+id/content_layout"
android:layout_height="match_parent"
android:background="#color/primary">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorColor="#color/white"
app:tabIndicatorHeight="2dp"
app:tabMode="scrollable" />
<android.support.v4.view.ViewPager
android:id="#+id/transactions_recharge"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tabs"
android:background="#android:color/transparent">
</android.support.v4.view.ViewPager>
</RelativeLayout>

Customize the tab layout with Multiple Level tabs

Hi i am trying to add a sub tablayout for my custom layout as this one:
I have successfully added the tablayout but:
How to add the sublayout as shown below??
As we see in the picture the first sub layout is related to the first tab layout
My layout.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
xmlns:ads="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.example.tiger.alahedclub.activity.navigation">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:popupTheme="#style/generalnotitle"
>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
app:titleTextColor="#android:color/black"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/yellow"
app:popupTheme="#style/generalnotitle">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/action_bar_title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_centerHorizontal="true"
android:text="#string/app_name"
android:textColor="#android:color/black"
android:textSize="24sp" />
</RelativeLayout>
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:background="#color/yellow"
app:tabTextColor="#android:color/black"
app:tabTextAppearance="#style/MineCustomTabText"
app:tabSelectedTextColor="#1B5E20"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabIndicatorHeight="2dp"
app:tabMaxWidth="0dp"
app:tabMode="fixed"
app:tabGravity="fill" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#B71C1C"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
</android.support.design.widget.CoordinatorLayout>
UPDATED :
activity holding the viewpager:
public class Detail_match extends AppCompatActivity {
private TabLayout tabLayout,tabLayout2;
private ViewPager viewPager;
int onStartCount = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
onStartCount = 1;
if (savedInstanceState == null) // 1st time
{
this.overridePendingTransition(R.anim.anim_slide_in_left,
R.anim.anim_slide_out_left);
} else // already created so reverse animation
{
onStartCount = 2;
}
setContentView(R.layout.activity_detail_match);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
tabLayout2 = (TabLayout) findViewById(R.id.tabs2);
}
#Override
protected void onPause() {
super.onPause();
}
#Override
protected void onStart() {
// TODO Auto-generated method stub
super.onStart();
if (onStartCount > 1) {
this.overridePendingTransition(R.anim.anim_slide_in_right,
R.anim.anim_slide_out_right);
} else if (onStartCount == 1) {
onStartCount++;
}
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new FiveFragment(), getString(R.string.lineup));
adapter.addFrag(new SixFragment(), getString(R.string.stats));
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);
}
}
}
My fragment five.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/coordinatorLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swipe_refresh"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_post"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</ScrollView>
</android.support.v4.widget.SwipeRefreshLayout>
</RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

In your Viewpager Fragment : That you are returning Fragment getItem(int position)
you need to add a Tablayout and a viewpager in xml
So in your FiveFragment xml :
<LinearLayout
android:id="#+id/main_layout"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- our tablayout to display tabs -->
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<!-- View pager to swipe views -->
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
And in onCreateView() of FiveFragment set up the viewpager with Tablayout..
Like:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.your_layout, container, false);
viewPager = (ViewPager) view.findViewById(R.id.pager);
addTabs(viewPager);
tabLayout = (TabLayout) view.findViewById(R.id.tabLayout);
tabLayout.setupWithViewPager(viewPager);
}
private void addTabs(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
adapter.addFrag(new Sublayout1(), "ONE");
adapter.addFrag(new Sublayout2(), "TWO");
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);
}
}
So each Fragment contain a Nested Tabs of item to control.

Android - TabLayout - Fragments are empty sometimes

I have created an app with a Tabbed Activity. I have 3 Tabs and in the first tab I have added a RecyclerView. At first everything works fine. But when I start the app now, the fragments are empty. Even the fragments of the 2nd and 3rd Tabs are empty, where I only placed a TextView. Here is the code from the MainActivity, it is mainly generated from Android Studio, I only added some code to change the Toolbar title and changed some small things:
public class MainActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
toolbar.setTitle("Pflege");
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
tabLayout.getTabAt(0).setIcon(R.drawable.tab_icon_pflege);
tabLayout.getTabAt(1).setIcon(R.drawable.tab_icon_dokumentation);
tabLayout.getTabAt(2).setIcon(R.drawable.tab_icon_probleme);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
switch(tab.getPosition()) {
case 0:
mViewPager.setCurrentItem(0);
toolbar.setTitle("Pflege");
break;
case 1:
mViewPager.setCurrentItem(1);
toolbar.setTitle("Daten");
break;
case 2:
mViewPager.setCurrentItem(2);
toolbar.setTitle("Probleme");
break;
default:
mViewPager.setCurrentItem(tab.getPosition());
toolbar.setTitle("Pflege");
break;
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch(position){
case 0:
Tab1Pflege tab1 = new Tab1Pflege();
return tab1;
case 1:
Tab2Dokumentation tab2 = new Tab2Dokumentation();
return tab2;
case 2:
Tab3Probleme tab3 = new Tab3Probleme();
return tab3;
default:
return null;
}
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Pflege";
case 1:
return "Daten";
case 2:
return "Probleme";
}
return null;
}
}
}
Here is the XML File for the MainActivity. I changed a bit, that the tabs will be placed at the bottom of the screen:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="eis1617.muellerkimmeyer.app.MainActivity">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingTop="#dimen/appbar_padding_top"
android:theme="#style/AppTheme.AppBarOverlay"
android:background="#3f84dd">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay" />
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:layout_above="#+id/tabs" />
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="bottom"
android:elevation="80dp"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="56dp"
android:clickable="true"
app:tabGravity="fill"
app:tabIndicatorHeight="0dp"
app:tabMode="fixed"
app:tabBackground="#drawable/tab_color_selector"
android:background="#3f84dd"/>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
Now here is the fragment for the first tab. It contains the RecyclerView:
public class Tab1Pflege extends Fragment {
private RecyclerView recyclerView;
private RecyclerView.Adapter rvAdapter;
private RecyclerView.LayoutManager rvLayoutManager;
private ArrayList<String> listItems;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.tab1_pflege, container, false);
listItems = new ArrayList<>();
listItems.add("Test1");
listItems.add("Test2");
listItems.add("Test3");
recyclerView = (RecyclerView) rootView.findViewById(R.id.recyclerView);
rvLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(rvLayoutManager);
rvAdapter = new RvAdapter(listItems);
recyclerView.setAdapter(rvAdapter);
return rootView;
}
}
And here is the XML File for that tab:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="eis1617.muellerkimmeyer.app.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/recyclerView"
/>
</RelativeLayout>
And here the XML file for the list items. There is a TextView on the left and an ImageView on the right:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="50dp"
android:background="?attr/selectableItemBackground">
<TextView
android:text="TextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/itemTitle"
android:layout_marginLeft="21dp"
android:layout_marginStart="21dp"
android:layout_centerVertical="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:textSize="20sp" />
<ImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="#+id/itemImage"
android:layout_marginRight="11dp"
android:layout_marginEnd="11dp"
android:layout_centerVertical="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
And finally here is my Adapter class for the RecyclerView:
public class RvAdapter extends RecyclerView.Adapter<RvAdapter.MyViewHolder> {
ArrayList<String> listItems;
public RvAdapter (ArrayList<String> listItems){
this.listItems = listItems;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.rv_item_layout, null);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, final int position) {
holder.itemTitle.setText(listItems.get(position));
holder.itemImage.setImageResource(R.drawable.ic_keyboard_arrow_right);
}
#Override
public int getItemCount() {
return listItems.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder{
TextView itemTitle;
ImageView itemImage;
public MyViewHolder(View itemView){
super(itemView);
itemTitle = (TextView) itemView.findViewById(R.id.itemTitle);
itemImage = (ImageView) itemView.findViewById(R.id.itemImage);
}
}
}
I have already tried to replace "extends FragmentPagerAdapter" in MainActivity with "extends FragmentStatePagerAdapter". But the fragments are still empty. Someone know what could be the problem? Sometimes when I change something for example in the XML file for the list items, it works again. But when I restart the app it didnt work anymore. Looks like it is random if it works or not.

ViewPager does not show anything

There's something wrong with my TabLayout and ViewPager. It does not show anything. Here's my adapter:
public class PagerAdapter extends FragmentStatePagerAdapter {
int mNumOfTabs;
public PagerAdapter(FragmentManager fm, int mNumOfTabs) {
super(fm);
this.mNumOfTabs = mNumOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return ChoiceFragment.newInstance("Mobile Games",
R.drawable.ic_stay_current_portrait_white_48dp, "1");
case 1:
return ChoiceFragment.newInstance("Computer Games",
R.drawable.ic_payment_white_48dp, "5");
default: return ChoiceFragment.newInstance("Mobile Games",
R.drawable.ic_stay_current_portrait_white_48dp, "1");
}
}
#Override
public int getCount() {
return mNumOfTabs;
}
#Override
public CharSequence getPageTitle(int position) {
String title;
if (position == 0)
title = "Mobile";
else
title = "Computer";
return title;
}
Here's my TabFragment class:
public class TabGroupFragment extends Fragment {
public TabGroupFragment() {
// Required empty public constructor
}
public static TabGroupFragment newInstance() {
TabGroupFragment fragment = new TabGroupFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tab_group, container, false);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Mobile"));
tabLayout.addTab(tabLayout.newTab().setText("Computer"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) view.findViewById(R.id.view_pager);
final PagerAdapter adapter = new PagerAdapter(
getActivity().getSupportFragmentManager(),
tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(
new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(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) {
}
});
return view;
}
}
And here's the layout for the above class:
FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".TabGroupFragment">
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/utility_white"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:id="#+id/tab_layout" />
<android.support.v4.view.ViewPager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/view_pager"/>
</LinearLayout>
</ScrollView>
I don't see any wrong here. I just followed the tutorial. Let me know what's happening here. Thank you

Thanks #MikeM. it all worked now. I removed the LinearLayout surrounding the TabLayout and ViewPager and changed the FrameLayout to RelativeLayout and they all showed up. Thank you!
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".TabGroupFragment">
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/utility_white"
android:elevation="6dp"
android:id="#+id/tab_layout" />
<android.support.v4.view.ViewPager
android:layout_below="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/view_pager"/>
</RelativeLayout>

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

Why is my tab layout for android not working? - android

I think you forget to set up your view pager with tabs try this one. ViewPager viewPager = findViewById(R.id.container); viewPager.setAdapter(new SectionsPagerAdapter(getSupportFragmentManager())); TabLayout tabLayout = findViewById(R.id.tabs); tablayout.setUpWithViewPager(viewPager);

Related

Same fragments in one TabLayout

How to add ViewPager in Fragment Class?

Customize the tab layout with Multiple Level tabs

Android - TabLayout - Fragments are empty sometimes

ViewPager does not show anything

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