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When running my code I keep getting this error in my logcat: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setVisibility(int)' on a null object reference

When debugging I get the following message:
EditText added is not a TextInputEditText. Please switch to using that class instead.

I have been searching for days but without luck. I am still learning to work with Android Studio so any help to resolve my problem would be appreciated!

My "GroupsFragment.java":

package com.example.flow.displayClasses.GroupScreens;









import android.os.Bundle;

import android.support.annotation.NonNull;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import com.amigold.fundapter.BindDictionary;

import com.amigold.fundapter.FunDapter;

import com.amigold.fundapter.extractors.StringExtractor;

import com.example.flow.R;

import com.amigold.fundapter.BindDictionary;

import com.amigold.fundapter.FunDapter;

import com.amigold.fundapter.extractors.StringExtractor;

import android.content.Intent;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.BaseAdapter;

import android.widget.EditText;

import android.widget.FrameLayout;

import android.widget.ImageView;

import android.widget.ListView;

import android.widget.TextView;



import com.example.flow.classes.Friends;

import com.example.flow.classes.Group;

import com.example.flow.classes.User;

import com.example.flow.displayClasses.FriendsScreen.FriendsFragment;

import android.support.design.widget.TextInputEditText;

import android.support.design.widget.TextInputLayout;



import java.util.ArrayList;

import java.util.Collections;

import java.util.List;



import android.view.MenuItem;

import android.support.annotation.Nullable;

import android.widget.Toast;





public class GroupsFragment extends Fragment {



    private final String TAG = this.getClass().getSimpleName();



    private static final String ARG_PARAM1 = "param1";

    private static final String ARG_PARAM2 = "param2";



    private String mParam1;

    private String mParam2;



    ArrayList<Group> groups = new ArrayList<Group>();





    public GroupsFragment() {

        // Required empty public constructor

    }



    public static GroupsFragment newInstance(String param1, String param2) {

        GroupsFragment fragment = new GroupsFragment();

        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);



        super.onCreate(savedInstanceState);

        if (getArguments() != null) {

            mParam1 = getArguments().getString(ARG_PARAM1);

            mParam2 = getArguments().getString(ARG_PARAM2);

        }





    }



    @Nullable

    @Override

    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

       View RootView = inflater.inflate(R.layout.fragment_groups, container, false);



        // Hardcoded for testing

        User u1 = new User("Bram", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u2 = new User("Bram1", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u3 = new User("Bram2", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u4 = new User("Bram3", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u5 = new User("Bram4", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u6 = new User("Bram5", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u7 = new User("Bram6", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u8 = new User("Bram7", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u9 = new User("Bram8", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u10 = new User("Bram9", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u11 = new User("Bram10", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u12 = new User("Bram11", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u13 = new User("Bram12", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u14 = new User("Bram13", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u15 = new User("Bram14", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u16 = new User("Bram15", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u17 = new User("Bram16", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");

        User u18 = new User("Bram17", "bram.de.plekker@student.ehb.be", "1234", "Captain Plek");



        ArrayList<User> ug1 = new ArrayList<User>();



        ug1.add(u1);

        ug1.add(u2);

        ug1.add(u3);



        ArrayList<User> ug2 = new ArrayList<User>();



        ug2.add(u4);

        ug2.add(u5);

        ug2.add(u6);

        //Collections.addAll(ug1, u4, u5, u6);



        ArrayList<User> ug3 = new ArrayList<User>();

        ug3.add(u1);

        ug3.add(u7);

        ug3.add(u8);

        ug3.add(u9);



        //Collections.addAll(ug1, u7, u8, u9);



        ArrayList<User> ug4 = new ArrayList<User>();

        Collections.addAll(ug1, u10, u11, u12);



        ArrayList<User> ug5 = new ArrayList<User>();

        Collections.addAll(ug1, u13, u14, u15);



        ArrayList<User> ug6 = new ArrayList<User>();

        Collections.addAll(ug1, u14, u5, u6);



        ArrayList<User> ug7 = new ArrayList<User>();

        Collections.addAll(ug1, u4, u10, u6, u18, u17);



        ArrayList<User> ug8 = new ArrayList<User>();

        Collections.addAll(ug1, u4, u5, u6);



        Group g1 = new Group(1, ug1, u1, "budies", u1, "date", true);

        Group g8 = new Group(2, ug1, u1, "budies", u1, "date", false);

        Group g9 = new Group(3, ug1, u1, "budies", u1, "date", true);

        Group g10 = new Group(4, ug1, u1, "budies", u1, "date", false);

        Group g11 = new Group(5, ug1, u1, "budies", u1, "date", true);

        Group g12 = new Group(6, ug1, u1, "budies", u1, "date", false);

        Group g13 = new Group(7, ug1, u1, "budies", u1, "date", false);

        Group g14 = new Group(8, ug1, u1, "budies", u1, "date", false);

        Group g15 = new Group(9, ug1, u1, "budies", u1, "date", true);

        Group g16 = new Group(10, ug1, u1, "budies", u1, "date", true);

        Group g17 = new Group(11, ug1, u1, "budies", u1, "date", true);

        Group g18 = new Group(12, ug1, u1, "budies", u1, "date", false);





        Collections.addAll(groups, g1, g8, g9, g10, g11, g12, g13, g14, g15, g16, g17, g18);





/*

        BindDictionary<Group> dictionary = new BindDictionary<>();



        dictionary.addStringField(R.id.blabla, new StringExtractor<Group>() {

            @Override

            public String getStringValue(Group groupname, int position) {

                return groupname.getName();

            }

        });



        dictionary.addStringField(R.id.prepaidIcon, new StringExtractor<Group>() {

            @Override

            public String getStringValue(Group prepaid, int position) {

                return "" + prepaid.isPrepaid();

            }

        });

        FunDapter adapter = new FunDapter(GroupsFragment.this.getActivity(), groups, R.layout.groups_layout, dictionary);

*/



        //getActivity() returns the Activity hosting the Fragment,

        // while getView() returns the view you inflated and returned by onCreateView

        //may cause nullpointer exception





        ListView list = (ListView)RootView.findViewById(R.id.listView);

        CustomAdapter adapter = new CustomAdapter();

        list.setAdapter(adapter);

        list.setOnItemClickListener(new AdapterView.OnItemClickListener()

        {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id)

            {

                Group selectedProduct = groups.get(position);

                Toast.makeText(GroupsFragment.this.getActivity(), selectedProduct.getName(), Toast.LENGTH_SHORT).show();



            }

        });



        return RootView;



    }





    class CustomAdapter extends BaseAdapter {



        int index;



        @Override

        public int getCount() {

            return groups.size();

        }



        @Override

        public Object getItem(int position) {

            return null;

        }



        @Override

        public long getItemId(int position) {

            return 0;

        }



        public View getView(int i, View view, ViewGroup viewgroup) {



            if (groups.get(i).isPrepaid()) {

                view = getLayoutInflater().inflate(R.layout.groups_prepaid_layout, null);

            } else {

                view = getLayoutInflater().inflate(R.layout.groups_layout, null);

            }





            TextView textView = view.findViewById(R.id.blabla);

            ImageView image = view.findViewById(R.id.member);

            String t = groups.get(i).getName();

            textView.setText(t);//nullpointer exception



            return view;

        }

    }

}

My "groups_lay_out.xml":

<?xml version="1.0" encoding="utf-8"?>





 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent">



    <TextView

        android:id="@+id/blabla"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="20dp"



        android:text="@string/textview"

        android:textAppearance="?android:attr/textAppearanceLarge" />





    <ImageView

        android:id="@+id/member"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_below="@+id/blabla"

        android:layout_marginStart="20dp"

        android:src="@drawable/ic_member" />

</RelativeLayout>

My "fragment_groups.xml":

<?xml version="1.0" encoding="utf-8"?>



<RelativeLayout 





xmlns:android="http://schemas.android.com/apk/res/android"

        xmlns:app="http://schemas.android.com/apk/res-auto"

        xmlns:tools="http://schemas.android.com/tools"

        android:id="@+id/groupsLayout"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        tools:context=".displayClasses.GroupScreens.GroupsFragment"

    >





    <TextView

        android:id="@+id/groupName"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"





        android:layout_alignParentTop="true"

        android:layout_centerHorizontal="true"

        android:layout_marginTop="10dp"

        android:text="@string/groups"

        android:textColor="#428EC4"

        android:textSize="30sp"

        android:textStyle="bold" />





    <EditText

        android:id="@+id/search_bar"

        android:layout_width="wrap_content"

        android:layout_height="40dp"

        android:layout_alignParentStart="true"

        android:layout_alignParentTop="true"

        android:layout_alignParentEnd="true"

        android:layout_marginStart="20dp"

        android:layout_marginTop="77dp"

        android:layout_marginEnd="20dp"

        android:background="@drawable/ic_bordersearch"

        android:ems="10"

        android:gravity="center"

        android:hint="@string/search_text" />



    <ImageButton

        android:id="@+id/searchButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"



        android:layout_alignTop="@+id/search_bar"

        android:layout_alignEnd="@+id/search_bar"

        android:layout_alignBottom="@+id/search_bar"

        android:layout_marginTop="5dp"

        android:layout_marginEnd="5dp"

        android:layout_marginBottom="5dp"

        android:background="@android:color/transparent"

        android:src="@drawable/ic_search_icon" />



    <ImageButton

        android:id="@+id/plusButton"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"



        android:layout_alignParentEnd="true"

        android:layout_alignParentBottom="true"

        android:layout_marginStart="298dp"

        android:layout_marginEnd="25dp"

        android:layout_marginBottom="55dp"

        android:background="@android:color/transparent"

        android:src="@drawable/ic_plussign" />





    <RelativeLayout

        android:id="@+id/linearLayout"

        android:layout_width="wrap_content"

        android:layout_height="386dp"

        android:layout_below="@+id/search_bar"

        android:layout_alignParentStart="true"

        android:layout_alignParentEnd="true"

        android:layout_alignParentBottom="true"

        android:layout_marginStart="20dp"

        android:layout_marginTop="19dp"

        android:layout_marginEnd="20dp"

        android:layout_marginBottom="50dp"

        android:orientation="vertical">



        <ListView

            android:id="@+id/listView"

            android:layout_width="match_parent"

            android:layout_height="match_parent"></ListView>

    </RelativeLayout>



</RelativeLayout>

My logcat:

 Process: com.example.flow, PID: 16906

    java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference

        at com.example.flow.displayClasses.GroupScreens.GroupsFragment$CustomAdapter.getView(GroupsFragment.java:237)

        at android.widget.AbsListView.obtainView(AbsListView.java:2366)

        at android.widget.ListView.makeAndAddView(ListView.java:2052)

        at android.widget.ListView.fillDown(ListView.java:786)

        at android.widget.ListView.fillFromTop(ListView.java:847)

        at android.widget.ListView.layoutChildren(ListView.java:1826)

        at android.widget.AbsListView.onLayout(AbsListView.java:2165)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.support.design.widget.HeaderScrollingViewBehavior.layoutChild(HeaderScrollingViewBehavior.java:142)

        at android.support.design.widget.ViewOffsetBehavior.onLayoutChild(ViewOffsetBehavior.java:41)

        at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onLayoutChild(AppBarLayout.java:1556)

        at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:888)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1231)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)

        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)

        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)

        at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)

        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1812)

        at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1656)

        at android.widget.LinearLayout.onLayout(LinearLayout.java:1565)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)

        at android.widget.FrameLayout.onLayout(FrameLayout.java:261)

        at com.android.internal.policy.DecorView.onLayout(DecorView.java:753)

        at android.view.View.layout(View.java:20672)

        at android.view.ViewGroup.layout(ViewGroup.java:6194)

        at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2792)

        at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2319)

        at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1460)

        at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7183)

        at android.view.Choreographer$CallbackRecord.run(Choreographer.java:949)

        at android.view.Choreographer.doCallbacks(Choreographer.java:761)

2018-11-21 14:01:06.799 16906-16906/com.example.flow E/AndroidRuntime:     at android.view.Choreographer.doFrame(Choreographer.java:696)

        at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:935)

        at android.os.Handler.handleCallback(Handler.java:873)

        at android.os.Handler.dispatchMessage(Handler.java:99)

        at android.os.Looper.loop(Looper.java:193)

        at android.app.ActivityThread.main(ActivityThread.java:6669)

        at java.lang.reflect.Method.invoke(Native Method)

        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

My debugger:

11/21 14:02:22: Launching app

$ adb shell am start -n "com.example.flow/com.example.flow.MainActivity" -a android.intent.action.MAIN -c android.intent.category.LAUNCHER -D

Waiting for application to come online: com.example.flow | com.example.flow.test

Waiting for application to come online: com.example.flow | com.example.flow.test

Waiting for application to come online: com.example.flow | com.example.flow.test

Waiting for application to come online: com.example.flow | com.example.flow.test

Connecting to com.example.flow

Capturing and displaying logcat messages from application. This behavior can be disabled in the "Logcat output" section of the "Debugger" settings page.

W/ActivityThread: Application com.example.flow is waiting for the debugger on port 8100...

I/System.out: Sending WAIT chunk

I/System.out: Debugger has connected

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

Connected to the target VM, address: 'localhost:8620', transport: 'socket'

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: waiting for debugger to settle...

I/System.out: debugger has settled (1399)

W/om.example.flo: JIT profile information will not be recorded: profile file does not exits.

I/chatty: uid=10085(com.example.flow) identical 10 lines

W/om.example.flo: JIT profile information will not be recorded: profile file does not exits.

I/InstantRun: starting instant run server: is main process

W/om.example.flo: Accessing hidden method Landroid/view/View;->computeFitSystemWindows(Landroid/graphics/Rect;Landroid/graphics/Rect;)Z (light greylist, reflection)

W/om.example.flo: Accessing hidden method Landroid/view/ViewGroup;->makeOptionalFitsSystemWindows()V (light greylist, reflection)

D/OpenGLRenderer: Skia GL Pipeline

D/: HostConnection::get() New Host Connection established 0xcb955e80, tid 17046

I/ConfigStore: android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasWideColorDisplay retrieved: 0

    android::hardware::configstore::V1_0::ISurfaceFlingerConfigs::hasHDRDisplay retrieved: 0

I/OpenGLRenderer: Initialized EGL, version 1.4

D/OpenGLRenderer: Swap behavior 1

W/OpenGLRenderer: Failed to choose config with EGL_SWAP_BEHAVIOR_PRESERVED, retrying without...

D/OpenGLRenderer: Swap behavior 0

D/EGL_emulation: eglCreateContext: 0xcb897b40: maj 3 min 0 rcv 3

D/EGL_emulation: eglMakeCurrent: 0xcb897b40: ver 3 0 (tinfo 0xde66cde0)

D/EGL_emulation: eglMakeCurrent: 0xcb897b40: ver 3 0 (tinfo 0xde66cde0)

W/ActivityThread: handleWindowVisibility: no activity for token android.os.BinderProxy@923b4b0

I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.

I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.

D/EGL_emulation: eglMakeCurrent: 0xcb897b40: ver 3 0 (tinfo 0xde66cde0)

You are getting that error because TextView wasn't initialised before you tried to set the text. Declare it outside the current block and initialise within onCreateView. Then you can set the text anywhere in your code.

For example,

    TextView textView; 



    @Nullable

    @Override

    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {

    View RootView = inflater.inflate(R.layout.fragment_groups, container, false);

    textView = view.findViewById(R.id.blabla); 

    }