Certain tablayout fragment is missing when changing navigationbar menu

Certain tablayout fragment is missing when changing navigationbar menu - java

So, im combining BottomNavbar with Tablayout, its works fine at first but when im changing menu from bottom navigation bar from home and then back to menu again , one of tablayout fragment is gone
like this :
as you can see in the image, at first its working perfectly fine, but when im changing to home then back in menu again, the fragment of tab minuman is gone
here is my code :
Layout
fragment_menu.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:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
tools:context=".MenuFragment">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.appbar.AppBarLayout
android:id="#+id/appBarLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tabLayoutView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/pal1c3"
app:tabTextColor="#color/white"
app:tabIndicatorColor="#color/black"/>
</com.google.android.material.appbar.AppBarLayout>
<androidx.viewpager.widget.ViewPager
android:id="#+id/containerViewPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:layout_editor_absoluteX="8dp"
android:layout_below="#+id/appBarLayout"/>
</RelativeLayout>
</FrameLayout>
fragment_makanan_menu.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.MakananMenuFragment">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#color/black"
android:layout_gravity="center"
android:gravity="center"
android:textSize="30sp"
android:text="Hello text"/>
</FrameLayout>
fragment_jajanan_menu.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.JajananMenuFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="#color/black"
android:textSize="30sp"
android:text="Jajanan Menu Fragment" />
</FrameLayout>
fragment_minuman_menu.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:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".ViewMenuHome.MinumanMenuFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:textColor="#color/black"
android:textSize="30sp"
android:text="#string/hello_blank_fragment" />
</FrameLayout>
Java
MenuFragment.java
package com.example.pesanpalgading20;
import android.content.Context;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import androidx.viewpager.widget.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.google.android.material.tabs.TabLayout;
/**
* A simple {#link Fragment} subclass.
* Use the {#link MenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MenuFragment extends Fragment {
TabLayout tabLayout;
ViewPager viewPager;
Context context;
// 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;
public MenuFragment() {
// 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 MenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static MenuFragment newInstance(String param1, String param2) {
MenuFragment fragment = new MenuFragment();
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) {
View viewRoot = inflater.inflate(R.layout.fragment_menu, container, false);
tabLayout = (TabLayout)viewRoot.findViewById(R.id.tabLayoutView);
viewPager = (ViewPager)viewRoot.findViewById(R.id.containerViewPager);
context = container.getContext();
tabLayout.addTab(tabLayout.newTab().setText("Makanan"));
tabLayout.addTab(tabLayout.newTab().setText("Minuman"));
tabLayout.addTab(tabLayout.newTab().setText("Jajanan"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final MyAdapter adapter = new MyAdapter(getActivity(),getFragmentManager(),tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
// Inflate the layout for this fragment
return viewRoot;
}
}
MyAdapter.java
package com.example.pesanpalgading20;
import android.content.Context;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentPagerAdapter;
import com.example.pesanpalgading20.ViewMenuHome.JajananMenuFragment;
import com.example.pesanpalgading20.ViewMenuHome.MakananMenuFragment;
import com.example.pesanpalgading20.ViewMenuHome.MinumanMenuFragment;
public class MyAdapter extends FragmentPagerAdapter {
private Context myContext;
int totalTabs;
public MyAdapter (Context context, FragmentManager fm, int totalTabs){
super(fm);
myContext = context;
this.totalTabs = totalTabs;
}
//fragment per tabs
#Override
public Fragment getItem(int position){
switch(position){
case 0:
MakananMenuFragment makananMenuFragment = new MakananMenuFragment();
return makananMenuFragment;
case 1:
MinumanMenuFragment minumanMenuFragment = new MinumanMenuFragment();
return minumanMenuFragment;
case 2:
JajananMenuFragment jajananMenuFragment = new JajananMenuFragment();
return jajananMenuFragment;
default: return null;
}
}
//counts total number of tabs
#Override
public int getCount() {
return totalTabs;
}
}
MakananMenuFragment.java
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ExpandableListView;
import com.example.pesanpalgading20.R;
import com.example.pesanpalgading20.ToppingAdapter.ToppingAdapter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* A simple {#link Fragment} subclass.
* Use the {#link MakananMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MakananMenuFragment extends Fragment {
ExpandableListView expandableListTopping;
List<String> listGroup;
HashMap<String,List<String>> listItem;
ToppingAdapter toppingAdapter;
// 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;
public MakananMenuFragment() {
// 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 MakananMenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static MakananMenuFragment newInstance(String param1, String param2) {
MakananMenuFragment fragment = new MakananMenuFragment();
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);
}
}
public MakananMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View viewRoot = inflater.inflate(R.layout.fragment_makanan_menu, container, false);
// Inflate the layout for this fragment
return viewRoot;
}
}
JajananMenuFragment.java
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.pesanpalgading20.R;
/**
* A simple {#link Fragment} subclass.
* Use the {#link JajananMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class JajananMenuFragment 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";
public JajananMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
public JajananMenuFragment() {
// 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 JajananMenuFragment.
*/
// TODO: Rename and change types and number of parameters
public static JajananMenuFragment newInstance(String param1, String param2) {
JajananMenuFragment fragment = new JajananMenuFragment();
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_jajanan_menu, container, false);
}
}
MinumanMenuFragment
package com.example.pesanpalgading20.ViewMenuHome;
import android.os.Bundle;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.pesanpalgading20.R;
/**
* A simple {#link Fragment} subclass.
* Use the {#link MinumanMenuFragment#newInstance} factory method to
* create an instance of this fragment.
*/
public class MinumanMenuFragment extends Fragment {
public MinumanMenuFragment(String mParam1) {
this.mParam1 = mParam1;
}
// 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;
public MinumanMenuFragment() {
// 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 MinumanMenu.
*/
// TODO: Rename and change types and number of parameters
public static MinumanMenuFragment newInstance(String param1, String param2) {
MinumanMenuFragment fragment = new MinumanMenuFragment();
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_minuman_menu, container, false);
}
}

so i found the solution in Tablayout does not display content
turn out the problem was the getFragmentmanager() in my MenuFragment.java
when i changed to getChildFragmentManager() there is no problem anymore

Related

Null Pointer on RecyclerView

I am getting a null pointer exception on the following statement within my recyclersetup method.
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
It is due to the following statement not setting a pointer to recyclerView in the previous statement which is
recyclerView = getView().findViewById(R.id.check_in_recent_row);
I cannot determine why I am not getting the recyclerView pointer established via this statement. the ID for the data is correct. What am I missing?
This is the entire fragment code
CheckInRecentList.java
package com.example.checkingin;
import android.content.Context;
import android.net.Uri;
import android.nfc.Tag;
import android.os.Bundle;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;
import androidx.lifecycle.ViewModelProvider.Factory;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageButton;
import android.widget.TextView;
import java.util.List;
import static androidx.constraintlayout.widget.Constraints.TAG;
/**
* A simple {#link Fragment} subclass.
* Activities that contain this fragment must implement the
* {#link CheckInRecentList.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {#link CheckInRecentList#newInstance} factory method to
* create an instance of this fragment.
*/
public class CheckInRecentList 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 RecyclerView recyclerView;
private RecyclerView.Adapter checkInListAdapter;
//private RecyclerView.LayoutManager layoutManager;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private MainViewModel mViewModel;
private CheckInListAdapter adapter;
private MainViewModelProviderFactory viewModelFactory;
private TextView checkInLastDateTime;
private TextView checkInTitle;
private TextView checkInDestinationName;
private TextView checkInComments;
private OnFragmentInteractionListener mListener;
public CheckInRecentList() {
// 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 CheckInRecentList.
*/
// TODO: Rename and change types and number of parameters
public static CheckInRecentList newInstance(String param1, String param2) {
CheckInRecentList fragment = new CheckInRecentList();
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);
Log.i(TAG, "onCreate: On Create");
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
// These were originally set up from the recycler view add to the fragment
// recyclerView = findViewById(R.id.check_in_recent_recycler_view);
// use this setting to improve performance if you know that changes
// in content do not change the layout size of the RecyclerView
//recyclerView.setHasFixedSize(true);
/*
// use a linear layout manager
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
*/
// specify an adapter (see also next example)
//checkInListAdapter = new CheckInListAdapter();
// recyclerView.setAdapter(checkInListAdapter);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
Log.i(TAG, "onCreateView: On Create View");
// Inflate the layout for this fragment
return inflater.inflate(R.layout.recycler_view_item, container, false);
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
Log.i(TAG, "onButtonPressed: ");
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
Log.i(TAG, "onAttach: OnAttach");
viewModelFactory = new MainViewModelProviderFactory(context.getApplicationContext());
mViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
Log.i(TAG,"OnAttach completed");
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
Log.i(TAG, "onActivityCreated: On Activity Created");
mViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
checkInLastDateTime = getView().findViewById(R.id.checkInLastDateTime);
checkInTitle = getView().findViewById(R.id.checkInTitle);
checkInDestinationName = getView().findViewById(R.id.checkInDestinationName);
checkInComments = getView().findViewById(R.id.checkInComments);
recyclerSetup();
Log.i(TAG,"OnActivityCreated: Recycler SetUp");
//listenerSetup();
//Log.i(TAG, "onActivityCreated: Listener SetUp");
observerSetup();
Log.i(TAG, "onActivityCreated: Observer SetUp");
}
#Override
public void onDetach() {
super.onDetach();
Log.i(TAG, "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);
}
private void clearFields() {
checkInLastDateTime.setText("");
checkInDestinationName.setText("");
checkInTitle.setText("");
checkInComments.setText("");
}
private void listenerSetup() {
ImageButton editCheckInButton = getView().findViewById(R.id.checkInEditButton);
ImageButton resendCheckInButton = getView().findViewById(R.id.checkInResendButton);
mViewModel = new ViewModelProvider(this, viewModelFactory).get(MainViewModel.class);
Log.i(TAG, "listenerSetup: ");
editCheckInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//put in edit check in logic
}
});
resendCheckInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//put in resend logic
}
});
}
private void observerSetup() {
Log.i(TAG, "observerSetup:");
if(mViewModel.getAllCheckIn() != null)
mViewModel.getAllCheckIn().observe(getViewLifecycleOwner(), new Observer<List<CheckInTable>>(){
#Override
public void onChanged(#Nullable final List<CheckInTable> allCheckIn) {
adapter.setCheckInList(allCheckIn);
}
});
mViewModel.getAllCheckIn().observe(getViewLifecycleOwner(), new Observer<List<CheckInTable>>() {
#Override
public void onChanged(#Nullable final List<CheckInTable> allCheckIn) {
if (allCheckIn.size() > 0) {
Log.i(TAG, "onChanged: all check in size greater than zero");
checkInLastDateTime.setText(allCheckIn.get(0).getCheckInLastDateTime());
Log.i(TAG, "onChanged: running again");
checkInDestinationName.setText(allCheckIn.get(0).getCheckInDestinationName());
checkInTitle.setText(allCheckIn.get(0).getCheckInTitle());
checkInComments.setText(allCheckIn.get(0).getCheckInComments());
} else {
checkInLastDateTime.setText("None Found");
}
}
});
}
private void recyclerSetup() {
Log.i(TAG, "recyclerSetup: ");
adapter = new CheckInListAdapter(R.layout.fragment_check_in_recent_list);
RecyclerView recyclerView = getView().findViewById(R.id.check_in_recent_recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(adapter);
//recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));
}
}
The following are the xml files for the fragment
fragment_check_in_recent_list.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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=".CheckInRecentList">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/check_in_recent_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:listitem="#layout/recycler_view_item"/>
</FrameLayout>
and recycler_view_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="horizontal"
android:padding="8dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TableLayout
android:id="#+id/check_in_recent_row"
android:layout_width="389dp"
android:layout_height="match_parent"
android:layout_gravity="center"
android:padding="30dp">
<TableRow
android:layout_width="346dp"
android:layout_height="match_parent">
<TextView
android:id="#+id/checkInLastDateTime"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView"/>
<TextView
android:id="#+id/checkInTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<TextView
android:id="#+id/checkInDestinationName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
<ImageButton
android:id="#+id/checkInEditButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/ic_menu_edit"
android:tooltipText="Edit Check In" />
<ImageButton
android:id="#+id/checkInResendButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#android:drawable/ic_menu_share"
android:tooltipText="Resend Check In" />
</TableRow>
<TableRow
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/checkInComments"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="TextView" />
</TableRow>
</TableLayout>
</LinearLayout>
CheckInListAdapter
package com.example.checkingin;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.app.Activity;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
import static androidx.constraintlayout.widget.Constraints.TAG;
public class CheckInListAdapter extends RecyclerView.Adapter<CheckInListAdapter.ViewHolder>{
private int checkInListLayout;
private List<CheckInTable> checkInList;
public CheckInListAdapter(int layoutId) {
checkInListLayout = layoutId;
}
public void setCheckInList(List<CheckInTable> allCheckIn) {
checkInList = allCheckIn;
notifyDataSetChanged();
}
#Override
public int getItemCount() {
return checkInList == null ? 0 : checkInList.size();
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Log.i(TAG, "onCreateViewHolder: ");
View view = LayoutInflater.from(
parent.getContext()).inflate(checkInListLayout, parent, false);
ViewHolder checkInListViewHolder = new ViewHolder(view);
return checkInListViewHolder;
}
#Override
public void onBindViewHolder(final ViewHolder holder, final int listPosition) {
TextView checkInLastDateTime = holder.checkInLastDateTime;
TextView checkInTitle = holder.checkInTitle;
TextView checkInDestinationName = holder.checkInDestinationName;
TextView checkInComments = holder.checkInComments;
ImageView checkInEditButton = holder.checkInEditButton;
ImageView checkInResendButton = holder.checkInResendButton;
Log.i(TAG, "onBindViewHolder: ");
checkInLastDateTime.setText(checkInList.get(listPosition).getCheckInLastDateTime());
checkInTitle.setText(checkInList.get(listPosition).getCheckInTitle());
checkInDestinationName.setText(checkInList.get(listPosition).getCheckInDestinationName());
checkInComments.setText(checkInList.get(listPosition).getCheckInComments());
holder.checkInEditButton.setImageResource(R.drawable.ic_menu_edit);
holder.checkInResendButton.setImageResource(R.drawable.ic_menu_share);
ImageButton editCheckInButton = checkInEditButton.findViewById(R.id.checkInEditButton);
ImageButton resendCheckInButton = checkInResendButton.findViewById(R.id.checkInResendButton);
editCheckInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//put in edit check in logic
}
}
);
resendCheckInButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//put in resend logic
}
});
}
static class ViewHolder extends RecyclerView.ViewHolder {
TextView checkInLastDateTime;
TextView checkInTitle;
TextView checkInDestinationName;
TextView checkInComments;
ImageView checkInEditButton;
ImageView checkInResendButton;
ViewHolder(View itemView) {
super(itemView);
Log.i(TAG, "ViewHolder: ");
checkInLastDateTime = itemView.findViewById(R.id.checkInLastDateTime);
checkInTitle = itemView.findViewById(R.id.checkInTitle);
checkInDestinationName = itemView.findViewById(R.id.checkInDestinationName);
checkInComments = itemView.findViewById(R.id.checkInComments);
checkInEditButton = itemView.findViewById(R.id.checkInEditButton);
checkInResendButton = itemView.findViewById(R.id.checkInResendButton);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
}
});
}
}
}

Your RecyclerView's ID is check_in_recent_recycler_view. Your findViewById call is using check_in_recent_row. These need to match.

Why my custom listview is not showing anything?

I am making a list view to show all the upcoming contests in codeforces. So I have made a CodeforcesContest object and a fragment which contains a ListView. I want all the information about a contest to be in a row of the ListView. Contest informations are contest name, contest time, and another string to hold the site name, which is always "Codeforces". Here's what I have so far. I am pretty new with Java and android. I have searched and found ways to implement custom listview with custom class. However, my listview is not showing anything. I am using android studio 3.0
CodeforcesContest.java
package com.example.redwanul.cptracker;
/**
* Created by redwanul on 12/1/17.
*/
public class CodeforcesContest {
private String name;
private String time;
public CodeforcesContest(String name, String time) {
this.name = name;
this.time = time;
}
public String getName() {
return name;
}
public String getTime() {
return time;
}
public void setName(String name) { this.name = name; }
public void setTime(String time) { this.time = time; }
}
Custom layout for a single row.
row.xml
<?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"
android:weightSum="9">
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/contest_name"
android:layout_weight="3"/>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/contest_site"
android:layout_weight="3"
/>
<TextView
android:layout_width="match_parent"
android:layout_height="0dp"
android:id="#+id/date_time"
android:layout_weight="3"/>
</LinearLayout>
My Fragment class for showing the ListView.
FragmentUpcomingContest.java
package com.example.redwanul.cptracker;
import android.content.Context;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import org.json.JSONArray;
import org.json.JSONObject;
import java.util.ArrayList;
/**
* A simple {#link Fragment} subclass.
* Activities that contain this fragment must implement the
* {#link FragmentUpcomingContest.OnFragmentInteractionListener} interface
* to handle interaction events.
* Use the {#link FragmentUpcomingContest#newInstance} factory method to
* create an instance of this fragment.
*/
public class FragmentUpcomingContest 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 FragmentUpcomingContest() {
// 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 FragmentUpcomingContest.
*/
// TODO: Rename and change types and number of parameters
public static FragmentUpcomingContest newInstance(String param1, String param2) {
FragmentUpcomingContest fragment = new FragmentUpcomingContest();
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) {
ArrayList <CodeforcesContest> arrayList = new ArrayList<>();
CodeforcesContest[] contests;
View myLayout = inflater.inflate(R.layout.fragment_fragment_upcoming_contest,container,false);
ListView listView = myLayout.findViewById(R.id.listView);
try {
JSONArray jsonArray = new GetCodeforcesContestList().execute().get();
for(int i = 0; i < jsonArray.length(); i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String _name = jsonObject.getString("name");
String _phase = jsonObject.getString("phase");
String _time = jsonObject.getString("startTimeSeconds");
Log.d("Debug: name",_name);
Log.d("Debug: phase",_phase);
Log.d("Debug: Time",_time);
if(_phase.equals(new String("BEFORE"))){
arrayList.add(new CodeforcesContest(_name,_time));
}
}
}
catch (Exception ex){
ex.printStackTrace();
}
contests = new CodeforcesContest[arrayList.size()];
for(int i = 0; i < arrayList.size(); i++){
contests[i] = arrayList.get(i);
}
Log.d("Array Length: ", new Integer(arrayList.size()).toString());
ContestAdapter mAdapter = new ContestAdapter(getContext(),R.layout.row,contests);
listView.setAdapter(mAdapter);
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_fragment_upcoming_contest, 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 {
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);
}
}
The fragment layout.
fragment_fragment_upcoming_contest
<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"
tools:context="com.example.redwanul.cptracker.FragmentUpcomingContest">
<!-- TODO: Update blank fragment layout -->
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/listView">
</ListView>
</FrameLayout>
My custom adapter for showing list.
ContestAdapter.java
package com.example.redwanul.cptracker;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.BaseAdapter;
import android.widget.TextView;
import org.w3c.dom.Text;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
/**
* Created by redwanul on 12/1/17.
*/
public class ContestAdapter extends ArrayAdapter<CodeforcesContest> {
Context context;
int layourResourceId;
private static LayoutInflater inflater = null;
CodeforcesContest[] data = null;
public ContestAdapter(Context context, int layoutResourceId, CodeforcesContest[] data){
super(context,layoutResourceId,data);
this.layourResourceId = layoutResourceId;
this.context = context;
this.data = data;
int ll = data.length;
Log.d("Constructor",new Integer(data.length).toString());
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View vi = convertView;
if(vi == null)
vi = inflater.inflate(R.layout.row,null);
CodeforcesContest contest = data[position];
Log.d("In Adapter",contest.getName());
TextView contestName = (TextView)vi.findViewById(R.id.contest_name);
TextView contestSite = (TextView)vi.findViewById(R.id.contest_site);
TextView timeDate = (TextView)vi.findViewById(R.id.date_time);
Date date = new Date(Integer.parseInt(contest.getTime()) * 1000);
SimpleDateFormat formatter = new SimpleDateFormat("M/D/YYYY");
String dateString = formatter.format(date);
contestName.setText(contest.getName());
contestSite.setText("Codeforces");
timeDate.setText(dateString);
return vi;
}
}

First change your row.XML height to android:layout_height="wrap_content"
<?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="wrap_content"
android:orientation="vertical"
android:weightSum="9">
You returning wrong layout your should return myLayout instead of return inflater.inflate(R.layout.fragment_fragment_upcoming_contest,
use this
return myLayout;
instead of this
return inflater.inflate(R.layout.fragment_fragment_upcoming_contest, container, false);

click on textview on listview on fragment

click on textview on listview on fragment
TextView On category_row.xml textViewCategoryName
onclick SetText this textViewCategoryName ok!
CategoriesFragment.java
package com.example;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v4.widget.ContentLoadingProgressBar;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.TextView;
import com.example.adapter.CategoryArrayAdapter;
import com.example.model.CategoryDataModel;
import com.example.parser.JSONParser;
import com.example.utils.Keys;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class CategoriesFragment extends Fragment {
private ListView listView;
private ArrayList<CategoryDataModel> list;
private CategoryArrayAdapter adapter;
private TextView categoryCurrent;
public CategoriesFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); }
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View rootView = inflater.inflate(R.layout.fragment_categories, null);
return rootView;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
/**
* Array List for Binding Data from JSON to this List
*/
list = new ArrayList<>();
adapter = new CategoryArrayAdapter(getActivity(), list);
/**
* Getting List and Setting List Adapter
*/
listView = (ListView) getActivity().findViewById(R.id.listView);
listView.setAdapter(adapter);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Snackbar.make(getActivity().findViewById(R.id.parentLayout), list.get(position).getCategoryName(), Snackbar.LENGTH_LONG).show();
}
});
/**
* Check internet connection
*/
//if (InternetConnection.checkConnection(getApplicationContext())) {
new GetDataCategories().execute();
//} else {
//Snackbar.make(getActivity().findViewById(R.id.parentLayout), "اتصال به اینترنت برقرار نیست", Snackbar.LENGTH_LONG).show();
//}
}
/**
* Creating Get Data Task for Getting Data From Web
*/
class GetDataCategories extends AsyncTask<Void, Void, Void> {
ContentLoadingProgressBar progressBar;
#Override
protected void onPreExecute() {
super.onPreExecute();
/**
* Progress Bar for User Interaction
*/
progressBar = (ContentLoadingProgressBar) getActivity().findViewById(R.id.progress);
progressBar.show();
}
#Nullable
#Override
protected Void doInBackground(Void... params) {
/**
* Getting JSON Object from Web Using okHttp
*/
JSONObject jsonObject = JSONParser.getDataFromWeb("http://example.com/api-service/v1/platform_categories/");
try {
/**
* Check Whether Its NULL???
*/
if (jsonObject != null) {
/**
* Check Length...
*/
if(jsonObject.length() > 0) {
/**
* Getting Array named "Categories" From MAIN Json Object
*/
JSONArray array = jsonObject.getJSONArray(Keys.KEY_CATEGORIES);
/**
* Check Length of Array...
*/
int lenArray = array.length();
if(lenArray > 0) {
for(int jIndex = 0; jIndex < lenArray; jIndex++) {
/**
* Creating Every time New Object
* and
* Adding into List
*/
CategoryDataModel model = new CategoryDataModel();
/**
* Getting Inner Object from contacts array...
* and
* From that We will get Name of that Contact
*
*/
JSONObject innerObject = array.getJSONObject(jIndex);
String category_name = innerObject.getString(Keys.KEY_CATEGORY_NAME);
String category_link = innerObject.getString(Keys.KEY_CATEGORY_LINK);
/**
* Getting Object from Object "other"
*/
//JSONObject otherObject = innerObject.getJSONObject(Keys.KEY_NAME);
//String other = otherObject.getString(Keys.KEY_NAME_SUB);
model.setCategoryName(category_name);
model.setCategoryLink(category_link);
/**
* Adding data in List...
*/
list.add(model);
}
}
}
} else {
}
} catch (JSONException je) {
Log.i(JSONParser.TAG, "" + je.getLocalizedMessage());
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
/**
* Progress Bar for User Interaction
*/
progressBar.hide();
/**
* Checking if List size if more than zero then
* Update ListView
*/
if(list.size() > 0) {
adapter.notifyDataSetChanged();
} else {
Snackbar.make(getActivity().findViewById(R.id.parentLayout), "مشکلی در اتصال به سرورهای سخنک رخ داده است!", Snackbar.LENGTH_LONG).show();
}
}
}
}
CategoryArrayAdapter.java
package com.example.adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.example.R;
import com.example.model.CategoryDataModel;
import java.util.List;
public class CategoryArrayAdapter extends ArrayAdapter<CategoryDataModel> {
List<CategoryDataModel> modelList;
Context context;
private LayoutInflater mInflater;
// Constructors
public CategoryArrayAdapter(Context context, List<CategoryDataModel> objects) {
super(context, 0, objects);
this.context = context;
this.mInflater = LayoutInflater.from(context);
modelList = objects;
}
#Override
public CategoryDataModel getItem(int position) {
return modelList.get(position);
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder vh;
if (convertView == null) {
View view = mInflater.inflate(R.layout.category_row, parent, false);
vh = ViewHolder.create((RelativeLayout) view);
view.setTag(vh);
} else {
vh = (ViewHolder) convertView.getTag();
}
CategoryDataModel item = getItem(position);
vh.textViewCategoryName.setText(item.getCategoryName());
return vh.rootView;
}
private static class ViewHolder {
public final RelativeLayout rootView;
public final TextView textViewCategoryName;
private ViewHolder(RelativeLayout rootView, TextView textViewCategoryName) {
this.rootView = rootView;
this.textViewCategoryName = textViewCategoryName;
}
public static ViewHolder create(RelativeLayout rootView) {
TextView textViewCategoryName = (TextView) rootView.findViewById(R.id.textViewCategoryName);
return new ViewHolder(rootView, textViewCategoryName);
}
}
}
fragment_categories.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"
android:layout_width="match_parent"
android:id="#+id/parentLayout"
android:layout_height="match_parent"
android:fitsSystemWindows="true"
tools:context=".MainActivity">
<android.support.v4.widget.ContentLoadingProgressBar
android:id="#+id/progress"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center_horizontal"
android:visibility="visible" />
<ListView app:layout_behavior="#string/appbar_scrolling_view_behavior"
android:id="#+id/listView"
android:layout_width="fill_parent"
android:layout_height="match_parent" />
</android.support.design.widget.CoordinatorLayout>
category_row.xml
<?xml version="1.0" encoding="utf-8"?>
<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="wrap_content"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_centerVertical="true"
android:layout_height="wrap_content"
android:layout_toLeftOf="#+id/imageViewProfilePhoto">
<TextView
android:id="#+id/textViewCategoryName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:textAppearance="?android:textAppearanceSmall"
android:textIsSelectable="true"
tools:text="Quote Content" />
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:layout_gravity="right"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true">
</LinearLayout>
</LinearLayout>
</RelativeLayout>

You have to set an onClickListener to your TextView in your ViewHolder.
private static class ViewHolder {
public final RelativeLayout rootView;
public final TextView textViewCategoryName;
private ViewHolder(RelativeLayout rootView, TextView textViewCategoryName) {
this.rootView = rootView;
this.textViewCategoryName = textViewCategoryName;
}
public static ViewHolder create(RelativeLayout rootView) {
TextView textViewCategoryName = (TextView) rootView.findViewById(R.id.textViewCategoryName);
textViewCategoryName.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// Do whatever you want
}
});
return new ViewHolder(rootView, textViewCategoryName);
}
}

cannot find symbol method findPreference(String)

I have hare one fragment where I try to get my set value from my list, buy it don't find findPreference method , why?
package com.cetabo.trackingpoint;
import android.app.Activity;
import android.content.Context;
import android.content.SharedPreferences;
import android.content.res.Resources;
import android.os.Bundle;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceManager;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import java.util.Timer;
import java.util.TimerTask;
import com.cetabo.trackingpoint.dummy.DummyContent;
import com.cetabo.trackingpoint.util.DetectionLocation;
import java.util.Date;
/**
* A fragment representing a list of Items.
* <p/>
* Large screen devices (such as tablets) are supported by replacing the ListView
* with a GridView.
* <p/>
* Activities containing this fragment MUST implement the {#link OnFragmentInteractionListener}
* interface.
*/
public class PlacesFragment extends Fragment implements AbsListView.OnItemClickListener {
// 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;
/**
* The fragment's ListView/GridView.
*/
private AbsListView mListView;
ImageView imageView;
/**
* The Adapter which will be used to populate the ListView/GridView with
* Views.
*/
private ListAdapter mAdapter;
// TODO: Rename and change types of parameters
public static PlacesFragment newInstance(String param1, String param2) {
PlacesFragment fragment = new PlacesFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public PlacesFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
// TODO: Change Adapter to display your content
// mAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, android.R.id.text1, DummyContent.ITEMS);
}
String[] test ={"test","test"};
String text = "Central Park";
Date data = new Date();
//---HERE IS MY PROBLEM---
ListPreference listPreference = (ListPreference) findPreference("sync_frequency");
//------------------------
// Resources res = getResources();
// String[] time = res.getStringArray(R.array.pref_example_list_values);
// ArrayAdapter<String> adapter = ArrayAdapter.createFromResource(this, R.array.pref_sync_frequency_values, android.R.layout.simple_spinner_item);
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_place, container, false);
Context ctx = view.getContext();
DetectionLocation detectionLocation = new DetectionLocation(ctx);
CustomListAdapter adapter=new CustomListAdapter(getActivity(),test,String.valueOf(detectionLocation.getLongitude()+" "+detectionLocation.getLatitude()),data);
mListView = (AbsListView) view.findViewById(android.R.id.list);
mListView.setAdapter(adapter);
// Set OnItemClickListener so we can be notified on item clicks
mListView.setOnItemClickListener(this);
return view;
}
#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;
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
if (null != mListener) {
// Notify the active callbacks interface (the activity, if the
// fragment is attached to one) that an item has been selected.
mListener.onFragmentInteraction(DummyContent.ITEMS.get(position).id);
}
}
/**
* The default content for this Fragment has a TextView that is shown when
* the list is empty. If you would like to change the text, call this method
* to supply the text it should use.
*/
public void setEmptyText(CharSequence emptyText) {
View emptyView = mListView.getEmptyView();
if (emptyView instanceof TextView) {
((TextView) emptyView).setText(emptyText);
}
}
/**
* 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(String id);
}
}

Because,
findPreference() is method from PreferenceFragment if you are using API Level 11+ devices. Or / Otherwise, It would be from PreferenceActivity.
For more info look at http://developer.android.com/reference/android/preference/PreferenceActivity.html

You can access preferences from within a fragment by creating a SharedPreference object in your onAttach method.
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(activity);
String myPref = sharedPrefs.getString("sync_frequency", "");
}

Android - NullPointerException with Fragment and Spinner

My fragment needs to create a spinner to control what gets displayed in the webview. There is also a progress bar that shows the loading from the spinner selection. Everything works well in a standard activity but moving it to a fragment is proving problematic. I will post the fragment and error.
Thanks!
the error occurs at this line:
spLoadFrom.setAdapter(spinnerArrayAdapter);
Here is the code:
package com.example.fragmenttest.app;
import android.app.Activity;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.Spinner;
public class BlankFragment 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";
public static final int DIALOG_DOWNLOAD_PROGRESS = 0;
ProgressBar pd = null;
public static final String PREFS_NAME2 = "SearchFile";
Spinner spLoadFrom;
WebView wv;
private LinearLayout container;
private Button nextButton, closeButton;
private EditText findBox;
private ArrayAdapter<CharSequence> spinnerArrayAdapter;
String name[] = { "mystuff" };
String displayName[] = {
"mystuff" };
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
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 BlankFragment.
*/
// TODO: Rename and change types and number of parameters
public static BlankFragment newInstance(String param1, String param2) {
BlankFragment fragment = new BlankFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
public BlankFragment() {
// 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) {
wv = (WebView) container.findViewById(R.id.webview);
pd = (ProgressBar) container.findViewById(R.id.pBar);
spLoadFrom = (Spinner) container.findViewById(R.id.Spinner02);
ArrayAdapter<String> spinnerArrayAdapter = new ArrayAdapter<String>(this.getActivity(), android.R.layout.simple_spinner_item, displayName);
spinnerArrayAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
spLoadFrom.setAdapter(spinnerArrayAdapter);
SpinnerListener spListener = new SpinnerListener();
spLoadFrom.setOnItemSelectedListener(spListener);
// Inflate the layout for this fragment
return inflater.inflate(R.layout.atcsectionweb2, container, false);
}
public class SpinnerListener implements AdapterView.OnItemSelectedListener {
public SpinnerListener() {
}
public void onItemSelected(AdapterView<?> arg0, View arg1,
final int position, long arg2) {
WebView wv = (WebView) getView().findViewById(R.id.webview);
wv.setWebChromeClient(new WebChromeClient() {
public void onProgressChanged(WebView view, int progress) {
if (progress < 100
&& pd.getVisibility() == ProgressBar.GONE) {
pd.setVisibility(ProgressBar.VISIBLE);
}
pd.setProgress(progress);
if (progress == 100) {
pd.setVisibility(ProgressBar.GONE);
}
}
});
wv.getSettings().setLoadWithOverviewMode(true);
wv.getSettings().setUseWideViewPort(true);
wv.getSettings().setBuiltInZoomControls(true);
wv.getSettings().setSupportZoom(true);
wv.setWebViewClient(new WebViewClient() {
#Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
view.loadUrl(url);
return true;
}
});
wv.loadUrl("file:///android_asset/" + name[position]);
}
public void onNothingSelected(AdapterView<?> arg0) {
}
}
// 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);
}
}
And the error:
04-23 19:17:10.621 9679-9679/com.example.fragmenttest.app E/AndroidRuntime﹕ FATAL EXCEPTION: main
Process: com.example.fragmenttest.app, PID: 9679
java.lang.NullPointerException
at com.example.fragmenttest.app.BlankFragment.onCreateView(BlankFragment.java:243)
at android.support.v4.app.Fragment.performCreateView(Fragment.java:1500)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:938)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1115)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1478)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:446)
at android.os.Handler.handleCallback(Handler.java:733)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:136)
at android.app.ActivityThread.main(ActivityThread.java:5017)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:515)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:798)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:614)
at miui.dexspy.DexspyInstaller.main(DexspyInstaller.java:171)
at dalvik.system.NativeStart.main(Native Method)
Here is the XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<ProgressBar
android:id="#+id/pBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Spinner
android:id="#+id/Spinner02"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/pBar" />
<WebView
android:id="#+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_below="#+id/Spinner02" />
<LinearLayout
android:id="#+id/layoutId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignTop="#+id/webview"
android:orientation="horizontal" >
</LinearLayout>
</RelativeLayout>

You have to use your inflated fragment layout:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.atcsectionweb2, container, false);
wv = (WebView) v.findViewById(R.id.webview);
pd = (ProgressBar) v.findViewById(R.id.pBar);
spLoadFrom = (Spinner) v.findViewById(R.id.Spinner02);
(...)
return v;
}

I got the same issue while setting adapter to spinner in fragment.... and solved it by....
if (getActivity() != null) {
spLoadFrom.setAdapter(spinnerArrayAdapter);
}

We Keep Coding

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