Android Studio Fragments not loading

Android Studio Fragments not loading - android

When loading my program on a device for testing, as I open different fragments using the bottom navigation nothing happens what so ever. If you need me to add more code please say so. I've posted my XML and Java for the Main Activity and the XML contains the mainFrame for my layout.
public class MainActivity extends AppCompatActivity {
private TextView mTextMessage;
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
switch (item.getItemId()) {
case R.id.shareFrame:
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
mTextMessage.setText(R.string.title_share);
return true;
case R.id.settingsFrame:
transaction.replace(R.id.mainFrame, new settingsFragment()).commit();
mTextMessage.setText(R.string.title_settings);
return true;
case R.id.helpFrame:
transaction.replace(R.id.mainFrame, new helpFragment()).commit();
mTextMessage.setText(R.string.title_help);
return true;
}
return false;
}
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mTextMessage = (TextView) findViewById(R.id.message);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
android.support.v4.app.FragmentManager fragmentManager = getSupportFragmentManager();
android.support.v4.app.FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
}
}
Here is the Java for my shareFragment.java
public class shareFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public shareFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment shareFragment.
*/
// TODO: Rename and change types and number of parameters
public static shareFragment newInstance(String param1, String param2) {
shareFragment fragment = new shareFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_share, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
Toast.makeText(context, "Share", Toast.LENGTH_SHORT).show();
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
And here is the XML
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/shareFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.swapdrop.swapdrop.shareFragment">
</FrameLayout>

Looks like your calling the empty Constructor.
Change:
transaction.replace(R.id.mainFrame, new shareFragment()).commit();
to
transaction.replace(R.id.mainFrame, shareFragment.newInstance("arg 1","arg 2")).commit();
Also, java convention is to upper case class names. shareFragment -> ShareFragment

Try change your layout with this:
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
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="com.swapdrop.swapdrop.MainActivity"
android:background="#d3d3d3">
<FrameLayout
android:id="#+id/mainFrame"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
</android.support.constraint.ConstraintLayout>
Now mainFrame is the FrameLayout instead of the parent Layout

Your root layout shouldn't be the "mainFrame". You should have a child ViewGroup to contain the fragment. Something 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:layout_height="match_parent">
<FrameLayout
android:id="#+id/mainFrame"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_above="#+id/navigation"
android:background="#d3d3d3" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="?android:attr/windowBackground"
app:menu="#menu/navigation" />
</RelativeLayout>

Why not try something like:
transaction.replace(R.id.mainFrame, shareFragment().newInstance("param1", " param2")).commit();
since the default constructor is not returning any Fragment().

Related

Fragment in a tab layout is blank after pressing back button

I have a navhost where fragments are swapped in and out and inside the navhost is a tabLayout with 3 fragments in the 3 tabs. once I go from the contact fragment to the addContact fragment and press the back button, the contact fragment is blank, the other 2 fragments are also blank but after a short delay, the view will load for them but not the contact fragment. this video will show what I'm saying a bit better https://drive.google.com/file/d/1fQlzTWV04Su-Gdi98buTbq4PIYKhSj7u/view?usp=sharing.
I've seen other people have this problem but they are using fragment transaction whereas I'm using a nav graph for navigation
my Fragment with the tablayout (activity_message.xml)
<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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.MainMenuFragment">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<TextView
android:id="#+id/title"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:gravity="center"
android:minHeight="?actionBarSize"
android:padding="#dimen/appbar_padding"
android:text="#string/app_name"
android:textAppearance="#style/TextAppearance.Widget.AppCompat.Toolbar.Title" />
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary" />
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" /></androidx.coordinatorlayout.widget.CoordinatorLayout>
my contact fragment (contact_fragment.xml)
<androidx.constraintlayout.widget.ConstraintLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.contactFragment">
<!-- TODO: Update blank fragment layout -->
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent">
</androidx.recyclerview.widget.RecyclerView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_margin="#dimen/fab_margin"
app:srcCompat="#android:drawable/ic_dialog_email" /></androidx.constraintlayout.widget.ConstraintLayout>
my add contact fragment
public class AddContactFragment extends Fragment {
private Contact contact;
public AddContactFragment() {
}
public static AddContactFragment newInstance(){
AddContactFragment fragment = new AddContactFragment();
Bundle args = new Bundle();
//args.putString(ARG_PARAM1, param1);
//args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
OnBackPressedCallback callback = new OnBackPressedCallback(true) {
#Override
public void handleOnBackPressed() {
Navigation.findNavController(getView()).navigate(R.id.action_addContactFragment_to_mainMenuFragment);
}
};
requireActivity().getOnBackPressedDispatcher().addCallback(this, callback);
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.add_contact_fragment,container,false);
TextView nameHeading = view.findViewById(R.id.contactNameHeading);
TextView numberHeading = view.findViewById(R.id.contactNoHeading);
TextView idHeading = view.findViewById(R.id.contactIdHeading);
nameHeading.setText("Name");
numberHeading.setText("Phone Number");
numberHeading.setText("Account ID");
return view;
}
}
my contact fragment (one in the tab layout)
public class contactFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private ArrayList<Contact> contacts;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public contactFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment contactFragment.
*/
// TODO: Rename and change types and number of parameters
public static contactFragment newInstance(String param1, String param2) {
contactFragment fragment = new contactFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View view = inflater.inflate(R.layout.fragment_contact, container, false);
RecyclerView rvContacts = (RecyclerView) view.findViewById(R.id.list);
contacts = Contact.createContactsList(50);
ContactsAdapter adapter = new ContactsAdapter(contacts);
rvContacts.setAdapter(adapter);
rvContacts.setLayoutManager(new LinearLayoutManager(getContext()));
FloatingActionButton fab = view.findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Navigation.findNavController(view).navigate(R.id.action_mainMenuFragment_to_addContactFragment);
}
});
return view;
}
}
my main menu fragment
public class MainMenuFragment extends Fragment {
public MainMenuFragment() {
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
public static MainMenuFragment newInstance(String param1, String param2) {
MainMenuFragment fragment = new MainMenuFragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.activity_message,container,false);
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this.getContext(), getFragmentManager());
ViewPager viewPager = view.findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = view.findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
return view;
}
}
my navhost (acvtivity_message_nav.xml)
<androidx.constraintlayout.widget.ConstraintLayout
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=".MessageActivity"
>
<fragment
android:id="#+id/fragment2"
android:name="androidx.navigation.fragment.NavHostFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:defaultNavHost="true"
app:navGraph="#navigation/nav_graph_message" /></androidx.constraintlayout.widget.ConstraintLayout>
my message activity
public class MessageActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message_nav);
}
#Override
public void onBackPressed() {
if (getFragmentManager().getBackStackEntryCount() == 1) {
finish();
} else {
super.onBackPressed();
}
}
}
my navgraph
<navigation 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/nav_graph_message"
app:startDestination="#id/mainMenuFragment">
<fragment
android:id="#+id/addContactFragment"
android:name="com.example.encryptedsmsapp.Fragments.AddContactFragment"
android:label="AddContactFragment" >
<action
android:id="#+id/action_addContactFragment_to_mainMenuFragment"
app:destination="#id/mainMenuFragment" />
</fragment>
<fragment
android:id="#+id/contactFragment"
android:name="com.example.encryptedsmsapp.Fragments.contactFragment"
android:label="fragment_contact"
tools:layout="#layout/fragment_contact" >
<action
android:id="#+id/action_contactFragment_to_addContactFragment"
app:destination="#id/addContactFragment" />
</fragment>
<fragment
android:id="#+id/mainMenuFragment"
android:name="com.example.encryptedsmsapp.Fragments.MainMenuFragment"
android:label="activity_message"
tools:layout="#layout/activity_message" >
<action
android:id="#+id/action_mainMenuFragment_to_addContactFragment"
app:destination="#id/addContactFragment" />
</fragment>

Fragment becomes empty after Notification

I have an Activity which loads a Fragment using getFragmentManager() . The fragment is working perfecty until an android notification appears. After that, the fragment becomes empty.
This is my application after the activity has loaded the fragment. The red square is the fragment.
Here, a external notification arrives to the mobile:
Only the fragment becomes empty:
Here my Activity:
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, FragmentSettings.OnFragmentInteractionListener{
FragmentManager fragmentManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (fragmentManager == null) {
fragmentManager = getSupportFragmentManager();
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
if (id == R.id.nav_locker_room) {
fragmentNameSection = "FragmentLockerRoom";
fragment = FragmentLockerRoom.newInstance(user, "");
}
fragmentManager.beginTransaction().replace(R.id.flContent, fragment, fragmentNameSection).commit();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
}
#Override
public void onResume() {
super.onResume();
}
}
Here the activity_main.xml:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout 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/drawer_layout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:openDrawer="start">
<include
layout="#layout/app_bar_main"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="start"
android:background="#drawable/side_nav_menu"
app:itemTextColor="#android:color/white"
app:itemIconTint="#android:color/white"
app:headerLayout="#layout/nav_header_main"
app:menu="#menu/activity_main_drawer" />
</android.support.v4.widget.DrawerLayout>
And finally this is my Fragment:
public class FragmentSettings extends Fragment {
private static final String ARG_USER = "user";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
getUser user;
View v;
DatabaseManager db;
private OnFragmentInteractionListener mListener;
ToggleButton notificationTrain, notificationNextMatch, liveSounds;
LayoutInflater inflater;
ViewGroup container;
FragmentSettings fragmentSettings;
public FragmentSettings() {
}
public static FragmentSettings newInstance(getUser user, String param2) {
FragmentSettings fragment = new FragmentSettings();
Bundle args = new Bundle();
args.putSerializable(ARG_USER, user);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
user = (com.androidsrc.futbolin.communications.http.auth.get.getUser) getArguments().getSerializable(ARG_USER);
mParam2 = getArguments().getString(ARG_PARAM2);
}
this.fragmentSettings = this;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
this.inflater = inflater;
this.container = container;
buildLayout();
return v;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
public void buildLayout(){
db = new DatabaseManager(getActivity());
v = inflater.inflate(R.layout.fragment_fragment_settings, container, false);
notificationTrain = v.findViewById(R.id.fragment_settings_notification_trainment_toggle);
notificationNextMatch = v.findViewById(R.id.fragment_settings_notification_next_match_toggle);
liveSounds = v.findViewById(R.id.fragment_settings_notification_live_sounds_toggle);
notificationTrain.setChecked(db.findNotification().isTrainActive());
notificationNextMatch.setChecked(db.findNotification().isMatchActive());
liveSounds.setChecked(db.findNotification().isLiveSoundsActive());
Log.e("notif",db.findNotification().toString());
notificationTrain.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton toggleButton, boolean isChecked) {
if(db == null){
db = new DatabaseManager(getActivity());
}
Notification notification = db.findNotification();
notification.setTrainActive(isChecked);
db.saveNotification(notification);
}
}) ;
notificationNextMatch.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton toggleButton, boolean isChecked) {
if(db == null){
db = new DatabaseManager(getActivity());
}
Notification notification = db.findNotification();
notification.setMatchActive(isChecked);
db.saveNotification(notification);
}
}) ;
liveSounds.setOnCheckedChangeListener( new CompoundButton.OnCheckedChangeListener() {
#Override
public void onCheckedChanged(CompoundButton toggleButton, boolean isChecked) {
if(db == null){
db = new DatabaseManager(getActivity());
}
Notification notification = db.findNotification();
notification.setLiveSoundsActive(isChecked);
db.saveNotification(notification);
}
}) ;
}
}
And the layout of my Fragment is:
<?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"
xmlns:app="http://schemas.android.com/apk/res-auto">
<ScrollView
android:id="#+id/fragment_locker_room_scrollview"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="60dp"
>
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/fragment_locker_room_total_constraint_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<!--
REST OF VIEWS
-->
</androidx.constraintlayout.widget.ConstraintLayout>
</ScrollView>
</LinearLayout>

Finally I found the solution. And ScrollView that has a layout_height="match_parent" when a notification is received changes his layout_height to 0.
Changing layout_height="match_parent" to layout_height="wrap_content" in ScrollView solves the issue.

java.lang.IllegalArgumentException: No view found for id 0x7f080076

I have a bottom navigation activity ,In bottom navigation activity I have 3 icons Home,Reminders,settings.
For this I have 3 fragments, Home fragment, Reminder fragment and settings fragment. I don't have anything in fragments all are empty fragments except Home fragment. In Home Fragment I have a Tab layout but I didn't added anything with tab layout.
After running the project the Home fragment is not get displayed (default when app get launched). It shows only the bottom navigation view.
If I clicked on reminders Icon app get crashed with the following error.
Error:
java.lang.IllegalArgumentException: No view found for id 0x7f080076 (com.aviz.www.reminder:id/reminders_Fragment) for fragment Reminders{2eca87b #0 id=0x7f080076}
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1413)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1740)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1809)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:799)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2580)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2367)
at android.support.v4.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2322)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2229)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:700)
at android.os.Handler.handleCallback(Handler.java:789)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6541)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
MainActivity.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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/Conslayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<FrameLayout
android:id="#+id/content_frame"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<android.support.design.widget.BottomNavigationView
android:id="#+id/navigation"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginEnd="0dp"
android:layout_marginStart="0dp"
android:background="?android:attr/windowBackground"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:menu="#menu/navigation" />
</android.support.constraint.ConstraintLayout>
MainActivity
public class MainActivity extends AppCompatActivity
implements Home.OnFragmentInteractionListener,
Reminders.OnFragmentInteractionListener,
Settings.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationView navigation = (BottomNavigationView) findViewById(R.id.navigation);
navigation.setOnNavigationItemSelectedListener(mOnNavigationItemSelectedListener);
}
private BottomNavigationView.OnNavigationItemSelectedListener mOnNavigationItemSelectedListener
= new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_home:
switchToHomeFragment();
break;
case R.id.navigation_dashboard:
switchToRemindersFragment();
break;
case R.id.navigation_notifications:
switchToSettingsFragment();
break;
}
return false;
}
};
public void switchToHomeFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.home_Fragment, new Home()).commit();
}
public void switchToRemindersFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.reminders_Fragment, new Reminders()).commit();
}
public void switchToSettingsFragment() {
FragmentManager manager = getSupportFragmentManager();
manager.beginTransaction().replace(R.id.settings_Fragment, new Settings()).commit();
}
#Override
public void onFragmentInteraction(Uri uri) {
}
}
Home Fragment XML
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/home_Fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".Fragments.Home">
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.AppBarOverlay">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_weight="1"
android:background="?attr/colorPrimary"
app:layout_scrollFlags="scroll|enterAlways"
app:popupTheme="#style/AppTheme.PopupOverlay"
app:title="#string/app_name">
</android.support.v7.widget.Toolbar>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
style="#style/MyCustomTabLayout"
android:layout_height="wrap_content">
<android.support.design.widget.TabItem
android:id="#+id/tabItem_Today"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Today" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem_ThisWeek"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Week" />
<android.support.design.widget.TabItem
android:id="#+id/tabItem_ThisMonth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="This Month" />
</android.support.design.widget.TabLayout>
</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" />
</FrameLayout>
Home.java
public class Home extends Fragment {
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public Home() {
}
public static Home newInstance(String param1, String param2) {
Home fragment = new Home();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
void onFragmentInteraction(Uri uri);
}
}
In Home.java all codes are auto generated code when I create the Home fragment.

in this line:
manager.beginTransaction().replace(R.id.reminders_Fragment, new Reminders()).commit();
R.id.reminders_Fragment
is a container id which will be wrapped around Remainders Fragment but i can not see any container in your Home layout with this id
even below code has same problem because you do not have any container with used
settings_Fragment id in your home layout:
manager.beginTransaction().replace(R.id.settings_Fragment, new Settings()).commit();
if you want every time one of your fragment be shown add one FrameLayout and use its id for container otherwise use one FrameLayout for every fragment and use id of FrameLayouts for transactions
You can use below code to select a default tab on resume:
onResume(){
super.onResume();
if(tabLayout.getSelectedTabPosition == -1)
tabLayout.getTabAt(0).select();
}

How to communicate from Mainactivity to Fragment using callback interface?

I'm having navigation drawer with four menu's and each menu has own fragments
, Inside first fragment has view pager sliding tab with 2 fragments,
Activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/drawer_layout"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true">
<android.support.design.widget.CoordinatorLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/main_content"
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:animateLayoutChanges="true"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
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"
app:tabIndicatorColor="#color/white"
app:tabIndicatorHeight="4dp" />
</android.support.design.widget.AppBarLayout>
////////////// Here I'm replacing each fragments ////////////////
<FrameLayout
android:id="#+id/main_content_framelayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="end|bottom"
android:layout_margin="#dimen/fab_margin"
android:src="#drawable/ic_done"
android:visibility="gone"/>
</android.support.design.widget.CoordinatorLayout>
<android.support.design.widget.NavigationView
android:id="#+id/nav_view"
android:layout_height="match_parent"
android:layout_width="wrap_content"
android:layout_gravity="start"
android:fitsSystemWindows="true"
app:headerLayout="#layout/nav_header"
app:menu="#menu/drawer_view"/>
</android.support.v4.widget.DrawerLayout>
ManinActivity- DrawerSelection
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the fragment to show based on nav item clicked
Fragment fragment = null;
Class fragmentClass = null;
switch (menuItem.getItemId()) {
case R.id.nav_home:
fragmentClass = Home_Tab_Fragment.class;
break;
case R.id.nav_myorders:
fragmentClass = SecondFragment.class;
break;
case R.id.nav_myoffers:
fragmentClass = ThirdFragment.class;
break;
case R.id.nav_notification:
fragmentClass = FourthFragment.class;
break;
}
fragment = (Fragment) fragmentClass.newInstance();
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.main_content_framelayout, fragment).commit();
mDrawerLayout.closeDrawers();
}
HomeTabFragment
public class Home_Tab_Fragment extends Fragment {
private FragmentActivity myContext;
ViewPager viewPager;
TabLayout tabLayout;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.layout_viewpager, container, false);
viewPager = (ViewPager) rootView.findViewById(R.id.view_pager);
return rootView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
SlidingTabAdapter adapter = new SlidingTabAdapter(getChildFragmentManager());
adapter.addFragment(new FirstTabFragment(), "First TAB");
adapter.addFragment(new SecondTabFragment(), "Second Tab");
viewPager.setAdapter(adapter);
tabLayout = (TabLayout) getActivity().findViewById(R.id.tabs);
tabLayout.setVisibility(View.VISIBLE);
tabLayout.setupWithViewPager(viewPager);
}
}
SlidingTabAdapter
public class SlidingTabAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragments = new ArrayList<>();
private final List<String> mFragmentTitles = new ArrayList<>();
public SlidingTabAdapter(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);
}
}
layout_viewpager.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.view.ViewPager
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent" />
FirstFragment
public class FirstTabFragment extends Fragment {
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_first, container, false);
getActivity().setTitle("Foodies");
return rootView ;
}
public void updateFirstFragmentValues(){
//Doing some operations
}
}
Inside MainActivity , I want to call FirstTabFragment method [updateFirstFragmentValues()]
I tried adding TAG in FirstTabFragment ,
public static final String TAG ="FirstTabFragment.TAG";
Then I invoked in MainActivity like below , but Fragment always null.
public void invokeMethodFromFirstTabFragment() {
FragmentManager fm = this.getSupportFragmentManager();
FirstTabFragment fb=(FirstTabFragment)fm.findFragmentByTag(FirstTabFragment.TAG);
if (null != fb) {
fb.updateFirstFragmentValues();
}else{
L.m("Fragment is null===========");
}
}
Kindly advise , How to call "FirstTabFragment" method from inside "MainActivity"
Please note FirstTabFragment is not added directly to MainActivity ,
its added through "Home_Tab_Fragment".

Alright, reading all of the responses of yours, I get that you just simply need to pass data to a fragment upon creation and be able to execute some of Fragment's methods. Ok, simple enough:
IMessageFragment interface
public interface IMessageFragment {
/**
* Method to receive new message text
* #param text Message text to receive
*/
void updateMessageText(String text);
}
MessageFragment
public class MessageFragment extends Fragment implements IMessageFragment {
/**
* Bind views using ButterKnife
*/
#BindView(R.id.textView) TextView mTextView;
/**
* Bundle data
*/
private String mMessageText;
/**
* Unique id of bundle data
*/
private static final String MESSAGE_EXTRA_KEY = "f_message";
/**
* New fragment pattern. This is pretty much all the magic PLUS this
* looks by far better than `new Fragment()` upon instatiation
*/
public static MessageFragment newFragment(String message) {
// 1. Create new fragment
MessageFragment auctionFragment = new MessageFragment();
// 2. Create bundle for fragment params
Bundle args = new Bundle();
// 3. Put position
args.putString(MESSAGE_EXTRA_KEY, message);
// 4. Set arguments
auctionFragment.setArguments(args);
return auctionFragment;
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tutorial_fragment, container, false);
/**
* Bind views
*/
ButterKnife.bind(this, view);
// Update UI
updateUI();
return view;
}
/**
* Method to update value of mTextView
*/
private void updateUI() {
if(!mMessageText.equals("")) {
mTextView.setText(mMessageText);
}
}
#Override
public void updateMessageText(String text) {
mMessageText = text;
updateUI();
}
}
Stuff is pretty simple and the interface exists only for good code style and to support design patterns.

Edit:
You cannot directly access FirstTabFragment method from your MainActivity. Firstly you have to call Home_Tab_Fragment method from activity. Then from that method you can call FirstTabFragment method.
Here is strategy:
Step 1: Home_Tab_Fragment to FirstTabFragment communication
define an interface like this
public interface IHomeToFirstFragmentController{
void firstFragmentMethod();
}
Now implements the IHomeToFirstFragmentController in your FirstTabFragment. then you have to implements the firstFragmentMethod().
#overrride
void firstFragmentMethod(){
}
Call this firstFragmentMethod method from Home_Tab_Fragment using this way
YOUR_fragmentInstance.firstFragmentMethod();
Step 2: Activity to Home_Tab_Fragment:
define an interface like this
public interface IActivityToHomeTabController{
void callFirstFragment();
}
Now implements the IFragmentController in your Home_Tab_Fragment. then you have to implements the callFirstFragment().
#overrride
void callFirstFragment(){
YOUR_fragmentInstance.firstFragmentMethod();
}
Edit 2:
Call fragment using this way
((IFragmentController)YOUR_fragmentInstance).firstFragmentMethod();
Hope this will give you an idea about this topics. For more info visit this answer

First for all, you create interface :
public interface CallBackListener{
void onCallBack();
}
In Fragment
public MyFragment extends Fragment{
private CallBackListener mCallBack;
#Override
public void onAttach(Context context) {
AppCompatActivity activity;
if (context instanceof AppCompatActivity) {
activity = (AppCompatActivity) context;
try {
mCallBack= (CallBackListener ) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString() + " class must be implement" +
" OnBackFragmentListener");
}
}
super.onAttach(context);
}
}
Use :
mCallBack.onCallBack();
And in Activity, you must implements interface :
public MyActivity extends AppCompatActivity implements CallBackListener{
#Override
public void onCallBack(){
// Do somethings here...
}
}

Layout in ViewPager being replaced

I have a ViewPager layout like the one below. However, the LinearLayout within the ViewPager disappears and is replaced by the content I'm loading into the ViewPager.
activity_main.xml
<LinearLayout
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"
android:orientation="vertical"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="60dp"
app:pstsTabTextAlpha="150"
app:pstsIndicatorHeight="3dp"
app:pstsShouldExpand="true"
app:pstsUnderlineHeight="0dp"
app:pstsTabTextSize="14dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabs">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
</android.support.v4.view.ViewPager>
</LinearLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity
implements FirstFragment.OnFragmentInteractionListener,
SecondFragment.OnFragmentInteractionListener,
ThirdFragment.OnFragmentInteractionListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Initialize the ViewPager and set an adapter
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(new PagerAdapter(getSupportFragmentManager()));
// Bind the tabs to the ViewPager
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
tabs.setViewPager(pager);
}
#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_group, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public void onFragmentInteraction(Uri uri){
//
}
private class PagerAdapter extends FragmentPagerAdapter {
private final String[] TITLES = {"First", "Second", "Third"};
public PagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return TITLES.length;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new ThirdFragment();
}
return null;
}
}
}
FirstFragment.java
public class FirstFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
String BASE_URL = "http://www.example.com/api";
private OnFragmentInteractionListener mListener;
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment FirstFragment.
*/
// TODO: Rename and change types and number of parameters
public static FirstFragment newInstance(String param1, String param2) {
FirstFragment fragment = new FirstFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public FirstFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
final ListView listView = (ListView) view.findViewById(R.id.listview_posts);
final ArrayList<Post> postArray = new ArrayList<Post>();
// REST API
final RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(BASE_URL)
.build();
final ApiEndpointInterface apiService = restAdapter.create(ApiEndpointInterface.class);
apiService.getData(1, new Callback<PostData>() {
#Override
public void success(PostData postData, Response response) {
final PostAdapter adapter = new PostAdapter(getActivity(), postArray);
postArray.addAll(postData.getData());
listView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
#Override
public void failure(RetrofitError retrofitError) {
retrofitError.printStackTrace();
}
});
return view;
}
class Deserializer implements JsonDeserializer<Post> {
#Override
public Post deserialize(JsonElement je, Type type, JsonDeserializationContext jdc)
throws JsonParseException {
// Get the "content" element from the parsed JSON
JsonElement content = je.getAsJsonObject().get("data");
// Deserialize it. You use a new instance of Gson to avoid infinite recursion
// to this deserializer
return new Gson().fromJson(content, Post.class);
}
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
public void onFragmentInteraction(Uri uri);
}
}
fragment_first.xml
<LinearLayout
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="com.project.app.FirstFragment">
<ListView
android:id="#+id/listview_posts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:dividerHeight="0dp"
android:divider="#null" />
</LinearLayout>
Why is it replacing everything in the ViewPager? How can I instead append the data to the ViewPager, such that the data goes below the layout in the ViewPager?

You can't do that... The viewpager will always do this.. yiu may need to put the layouts outside the viewpager.. in a way the makes user feel they are inside...

you should include this components in Fragment layout
<LinearLayout
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="com.project.app.FirstFragment">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
<ListView
android:id="#+id/listview_posts"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:dividerHeight="0dp"
android:divider="#null" />
</LinearLayout>
or place them under ViewPager like this
<LinearLayout
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"
android:orientation="vertical"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<com.astuetz.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="60dp"
app:pstsTabTextAlpha="150"
app:pstsIndicatorHeight="3dp"
app:pstsShouldExpand="true"
app:pstsUnderlineHeight="0dp"
app:pstsTabTextSize="14dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#+id/tabs">
</android.support.v4.view.ViewPager>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal">
<ImageView
android:layout_width="120dp"
android:layout_height="120dp"
android:id="#+id/image"
android:layout_gravity="center_horizontal"
android:layout_marginTop="5dp"
android:background="#drawable/ic_image"
android:adjustViewBounds="true"
android:scaleType="centerCrop" />
</LinearLayout>
</LinearLayout>

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.

Android Studio Fragments not loading - android

Looks like your calling the empty Constructor. Change: transaction.replace(R.id.mainFrame, new shareFragment()).commit(); to transaction.replace(R.id.mainFrame, shareFragment.newInstance("arg 1","arg 2")).commit(); Also, java convention is to upper case class names. shareFragment -> ShareFragment

Why not try something like: transaction.replace(R.id.mainFrame, shareFragment().newInstance("param1", " param2")).commit(); since the default constructor is not returning any Fragment().

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