Argthtjtr

When trying to load a fragment coming from another fragment layout my application stops.

When looking at the logcat I get this error:

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.flow/com.example.flow.displayClasses.GroupScreens.HomeGroupFragment}; have you declared this activity in your AndroidManifest.xml?

        at android.app.Instrumentation.checkStartActivityResult(Instrumentation.java:2005)

        at android.app.Instrumentation.execStartActivity(Instrumentation.java:1673)

        at android.app.Activity.startActivityForResult(Activity.java:4586)

        at android.support.v4.app.FragmentActivity.startActivityForResult(FragmentActivity.java:767)

        at android.support.v4.app.ActivityCompat.startActivityForResult(ActivityCompat.java:234)

        at android.support.v4.app.FragmentActivity.startActivityFromFragment(FragmentActivity.java:881)

        at android.support.v4.app.FragmentActivity$HostCallbacks.onStartActivityFromFragment(FragmentActivity.java:995)

        at android.support.v4.app.Fragment.startActivity(Fragment.java:1084)

        at android.support.v4.app.Fragment.startActivity(Fragment.java:1073)

        at com.example.flow.displayClasses.GroupScreens.GroupsFragment$1.onItemClick(GroupsFragment.java:170)

        at android.widget.AdapterView.performItemClick(AdapterView.java:318)

        at android.widget.AbsListView.performItemClick(AbsListView.java:1159)

        at android.widget.AbsListView$PerformClick.run(AbsListView.java:3136)

        at android.widget.AbsListView$3.run(AbsListView.java:4052)

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

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

My fragment from where I come:

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 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);



        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)

            {

                Intent intent = new Intent(getActivity().getApplicationContext(), HomeGroupFragment.class);

                intent.putExtra("group", groups.get(position));



                startActivity(intent);

            }

        });



        return RootView;



    }





    class CustomAdapter extends BaseAdapter {



        int index;



        @Override

        public int getCount() {

            return groups.size();

        }



        @Override

        public Object getItem(int position) {

            return position;

        }



        @Override

        public long getItemId(int id) {

            return id ;

        }



        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.Groupname);

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

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

            textView.setText(t);



            return view;

        }

    }

}

The fragment that won't load:

package com.example.flow.displayClasses.GroupScreens;



import android.content.Intent;

import android.graphics.Color;

import android.graphics.Typeface;

import android.support.annotation.NonNull;

import android.support.annotation.Nullable;

import android.support.constraint.ConstraintLayout;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.TypedValue;

import android.view.View;

import android.view.ViewGroup;

import android.widget.AdapterView;

import android.widget.BaseAdapter;

import android.widget.Button;

import android.widget.ListView;

import android.widget.TextView;



import android.widget.Toast;



import com.amigold.fundapter.BindDictionary;

import com.amigold.fundapter.FunDapter;

import com.amigold.fundapter.extractors.StringExtractor;

import com.example.flow.Home;

import com.example.flow.R;

import com.example.flow.classes.Group;

import com.example.flow.classes.GroupExpense;

import com.example.flow.classes.UserExpense;



import java.io.Serializable;

import java.util.ArrayList;

import java.util.Collections;

import java.util.Objects;



public class HomeGroupFragment 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<GroupExpense> expense = new ArrayList<GroupExpense>();





    public HomeGroupFragment() {

        // Required empty public constructor

    }



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

        HomeGroupFragment fragment = new HomeGroupFragment();

        Bundle args = new Bundle();

        args.putString(ARG_PARAM1, param1);

        args.putString(ARG_PARAM2, param2);

        fragment.setArguments(args);

        return fragment;

    }



    Group group;

    boolean status;



    @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_group, container, false);

/*

        super.onCreate(savedInstanceState);

        getActivity().setContentView(R.layout.fragment_group);

        ConstraintLayout layout =getActivity().findViewById(R.id.groupLayout);

        status = true;*/



        //harcoded



        UserExpense ux = new UserExpense(group.getUsers().get(2), 5.3);

        UserExpense ux1 = new UserExpense(group.getUsers().get(3), 6.91);



        ArrayList<UserExpense> uxs = new ArrayList<UserExpense>();

        Collections.addAll(uxs, ux, ux1);



        GroupExpense ex = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex1 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex2 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex3 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex4 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex5 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex6 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex7 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex8 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex9 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex10 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex11 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex12 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex13 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex14 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);

        GroupExpense ex15 = new GroupExpense(1, group.getUsers().get(1), "pitta", "voor te eten", 12.21, "13 oktober 2018", uxs);





        Collections.addAll(expense, ex, ex1, ex2, ex3, ex4, ex5, ex6, ex7, ex8, ex9, ex10, ex11, ex12, ex13, ex14, ex15);



        Intent intent = getActivity().getIntent();

        group = Objects.requireNonNull(intent.getExtras()).getParcelable("group");



        int id = intent.getIntExtra("group", -1);



        TextView t = getActivity().findViewById(R.id.Groupname);

        t.setText(group.getName());

        t.setId(group.getGroupId());



        setLayout();



    return RootView;

    }



    public void changeToMember(View view)

    {

        Button member =getActivity().findViewById(R.id.member);

        Button history =getActivity().findViewById(R.id.history);



        if (status) {

            member.setBackgroundResource(R.drawable.bottom_border_selected);

            member.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);

            member.setTypeface(null, Typeface.BOLD);

            member.setTextColor(Color.parseColor("#4799E8"));



            history.setBackgroundResource(R.drawable.bottom_border);

            history.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);

            history.setTypeface(null, Typeface.NORMAL);

            history.setTextColor(Color.parseColor("#000000"));





            status = false;

            setLayout();

        }

    }



    public void changeToHistory(View view)

    {

        Button member = getActivity().findViewById(R.id.member);

        Button history =getActivity().findViewById(R.id.history);



        if (!status) {

            member.setBackgroundResource(R.drawable.bottom_border);

            member.setTextSize(TypedValue.COMPLEX_UNIT_SP, 14);

            member.setTypeface(null, Typeface.NORMAL);

            member.setTextColor(Color.parseColor("#000000"));



            history.setBackgroundResource(R.drawable.bottom_border_selected);

            history.setTextSize(TypedValue.COMPLEX_UNIT_SP, 20);

            history.setTypeface(null, Typeface.BOLD);

            history.setTextColor(Color.parseColor("#4799E8"));

            status = true;

            setLayout();

        }

    }



    public void setLayout()

    {

        ListView list = getActivity().findViewById(R.id.expenseList);

        CustomAdapter ad = new CustomAdapter();

        list.setAdapter(ad);



        list.setOnItemClickListener(new AdapterView.OnItemClickListener()

        {

            @Override

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

            {

                if (status) {

                    Intent intent = new Intent(getActivity().getApplicationContext(), GroupExpenseFragment.class);

                    intent.putExtra("expense", expense.get(position));

                    startActivity(intent);

                } else {

                    Intent intent = new Intent(getActivity().getApplicationContext(), Home.class);

                    intent.putExtra("group", group.getUsers().get(position));

                    startActivity(intent);

                }

            }

        });

    }



    public void leaveGroup(View view)

    {



    }



    class CustomAdapter extends BaseAdapter

    {



        @Override

        public int getCount()

        {



            return status ? expense.size() : group.getUsers().size();

        }



        @Override

        public Object getItem(int position)

        {

            return position;

        }



        @Override

        public long getItemId(int id)

        {

            return id;

        }



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

        {



            if (status) {

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



                TextView user = view.findViewById(R.id.username);

                TextView subject = view.findViewById(R.id.subject);

                TextView amount = view.findViewById(R.id.expenseAmount);



                user.setText(expense.get(i).getCreditor().getName());

                subject.setText(expense.get(i).getName());

                amount.setText(String.valueOf(expense.get(i).getAmount()));

            } else {

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



                TextView name = view.findViewById(R.id.nameMember);

                TextView admin = view.findViewById(R.id.privilege);

                TextView date = view.findViewById(R.id.date);



                name.setText(group.getUsers().get(i).getName());

                admin.setText("");

                date.setText("");

            }



            return view;

        }

    }

}

The fragment_group.xml file:

<?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="match_parent"

    tools:context=".displayClasses.GroupScreens.HomeGroupFragment">



    <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/groupLayout"

        android:layout_width="match_parent"

        android:layout_height="match_parent"

        tools:context=".displayClasses.GroupScreens.GroupFragment">

    <TextView

        android:id="@+id/Groupname"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginTop="8dp"

        android:layout_marginEnd="8dp"

        android:text="@string/group_name"

        android:textColor="#428EC4"

        android:textSize="24sp"

        android:textStyle="bold"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toTopOf="parent" />



    <Button

        android:id="@+id/member"

        style="@style/selected"

        android:layout_width="wrap_content"

        android:layout_marginTop="8dp"

        android:fontFamily="sans-serif"

        android:text="@string/history"

        android:textAllCaps="false"

        app:layout_constraintEnd_toStartOf="@+id/history"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/Groupname" />



    <Button

        android:id="@+id/history"

        style="@style/unselected"

        android:layout_width="wrap_content"

        android:layout_marginTop="8dp"

        android:fontFamily="sans-serif"

        android:text="@string/members"

        android:textAllCaps="false"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintHorizontal_bias="0.5"

        app:layout_constraintStart_toEndOf="@+id/member"

        app:layout_constraintTop_toBottomOf="@+id/Groupname" />



    <LinearLayout

        android:layout_width="0dp"

        android:layout_height="0dp"

        android:layout_marginStart="8dp"

        android:layout_marginTop="8dp"

        android:layout_marginEnd="8dp"

        android:layout_marginBottom="8dp"

        android:orientation="vertical"

        app:layout_constraintBottom_toTopOf="@+id/textView3"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent"

        app:layout_constraintTop_toBottomOf="@+id/history">





        <ListView

            android:id="@+id/expenseList"

            android:layout_width="match_parent"

            android:layout_height="match_parent">



        </ListView>

    </LinearLayout>



    <TextView

        android:id="@+id/textView3"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_marginStart="8dp"

        android:layout_marginEnd="8dp"

        android:layout_marginBottom="8dp"

        android:text="@string/leave_group"

        app:layout_constraintBottom_toBottomOf="parent"

        app:layout_constraintEnd_toEndOf="parent"

        app:layout_constraintStart_toStartOf="parent" />



    </android.support.constraint.ConstraintLayout>

</RelativeLayout>

The group_expense_layout:

<?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:layout_width="match_parent"

    android:layout_height="match_parent">



    <TextView

        android:id="@+id/username"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignParentStart="true"

        android:layout_centerVertical="true"

        android:layout_marginStart="25dp"

        android:text="Username"

        android:textSize="18sp"

        android:textStyle="bold" />



    <TextView

        android:id="@+id/subject"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/username"

        android:layout_marginStart="65dp"

        android:layout_toEndOf="@+id/username"

        android:text="Name" />



    <TextView

        android:id="@+id/expenseAmount"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content"

        android:layout_alignBottom="@+id/username"

        android:layout_alignParentEnd="true"

        android:layout_marginStart="93dp"

        android:layout_marginEnd="25dp"

        android:layout_toEndOf="@+id/subject"

        android:text="TextView" />



</RelativeLayout>

The manifest:

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

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

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

    package="com.example.flow">



    <application

        android:allowBackup="true"

        android:icon="@mipmap/ic_launcher"

        android:label=" "

        android:roundIcon="@mipmap/ic_launcher_round"

        android:supportsRtl="true"

        tools:ignore="GoogleAppIndexingWarning"

        tools:replace="android:icon,android:label">



        <activity

            android:theme="@style/AppTheme"

            android:name=".MainActivity">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>



        <activity

            android:theme="@style/AppTheme.NoActionBar"

            android:name=".Home"

            android:parentActivityName=".displayClasses.LoginScreens.Login">

            <meta-data

                android:name="android.support.PARENT_ACTIVITY"

                android:value=".displayClasses.LoginScreens.Login" />

        </activity>



        <activity

            android:theme="@style/AppTheme"

            android:name=".displayClasses.LoginScreens.activity_signup" />



        <activity

            android:theme="@style/AppTheme"

            android:name=".displayClasses.LoginScreens.Login" />



    </application>

</manifest>

But as far as I know I shouldn't implement a fragment in my Manifest. So do I need to rewrite the Intent statements? And so yes, how do I do it correctly? I'm learning to work with Android Studio any help is much appreciated.

android.content.ActivityNotFoundException: Unable to find explicit activity class {com.example.flow/com.example.flow.displayClasses.GroupScreens.HomeGroupFragment}; have you declared this activity in your AndroidManifest.xml?

Have you declared the activity inside the Manifest?

EDIT:

This code here

        @Override

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

        {

            Intent intent = new Intent(getActivity().getApplicationContext(), HomeGroupFragment.class);

            intent.putExtra("group", groups.get(position));



            startActivity(intent);

        }

That's not how you initialize a fragment.
startActivity() is used to start activites. That's why the crash is happening.

To use a framgent you have to do a Fragment Transaction. Create a FrameLayout in you activity where you will add that fragment.
More info How do I add a Fragment to an Activity with a programmatically created content view

You need to import these libraries:

 import android.support.v4.app.Fragment;

 import android.support.v4.app.FragmentManager;

Then in onClick you need to call fragment transation for display
a fragment. Intents are for activities:

 HomeGroupFragment f = HomeGroupFragment.newInstance(position); // call the fragment you want to display with new instance

 //f.setArguments(bundle);  // if you want to send arguments

 FragmentManager fragmentManager = getSupportFragmentManager();        // for transaction, call fragment manager

 fragmentManager.beginTransaction().replace(R.id.main_frame, f).addToBackStack(null).commit();

  // addToBackStack = optional if ypu want to add the fragment to stack

  // commit = end the transaction

If you want to send arguments:

 Bundle bundle = new Bundle();

 bundle.putInt("position", groups.get(position));

 bundle.putString("anyText", groups.getText());