How do I create a fragment template(class with variables and methods, layout) for multiple fragments with the same content?

Question

On the main screen I have 7 buttons (days) and a fragment. For every day of the week I wanted to generate a fragment with some EditTexts and a ListView, but creating 7 fragments with the same layout and almost the same class content seems too repetitive. I only did it for Monday and Tuesday.

The only difference between MondayFragment and TuesdayFragment is that in TuesdayFragment I renamed the variable mondayTV to tuesdayTV and in layout I changed the ids of the submit button and the ListView. Also the key for Bundle is different. I don't think it's worth posting it since it's so similar to MondayFragment.

I want to know if it's possible to create a fragment template and use it to generate a fragment for every button of the activity given this code I wrote. There is still a lot to work on when it comes to functionality but I can't get this idea out of my head.

MainActivity.java

package com.example.dietmanagement;

import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    public Button monday, tuesday, wednesday, thursday, friday, saturday, sunday;

    final MondayFragment mondayFragment = new MondayFragment();
    final TuesdayFragment tuesdayFragment = new TuesdayFragment();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        /*Intent i = getIntent();
        String current_user = i.getStringExtra("current_user");
        TextView current_user_txtview = findViewById(R.id.current_user);
        current_user_txtview.setText("Welcome, " + current_user);*/

        monday = (Button)findViewById(R.id.monday_btn);
        tuesday = (Button)findViewById(R.id.tuesday_btn);
        wednesday = (Button)findViewById(R.id.wednesday_btn);
        thursday = (Button)findViewById(R.id.thursday_btn);
        friday = (Button)findViewById(R.id.friday_btn);
        saturday = (Button)findViewById(R.id.saturday_btn);
        sunday = (Button)findViewById(R.id.sunday_btn);

        monday.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openFragment(mondayFragment);
                getDay(mondayFragment, "monday", (String) monday.getContentDescription());
            }
        });


        tuesday.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                openFragment(tuesdayFragment);
                getDay(tuesdayFragment, "tuesday", (String) tuesday.getContentDescription());
            }
        });

    }

    private void openFragment(final Fragment fragment){
        FragmentManager fragmentManager = getSupportFragmentManager();
        FragmentTransaction transaction = fragmentManager.beginTransaction();
        transaction.replace(R.id.daysfragment, fragment);
        transaction.addToBackStack(null);
        transaction.commit();
    }

    public void getDay(final Fragment fragment, String key, String value)
    {
        Bundle bnd = new Bundle();
        bnd.putString(key, value);
        fragment.setArguments(bnd);
    }

}

Activity_main.xml

    <?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_green"
    tools:context=".MainActivity">


    <Button
        android:id="@+id/tuesday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:contentDescription="@string/tuesday_context"
        android:text="@string/tuesday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.194"
        app:layout_constraintStart_toEndOf="@+id/monday_btn"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.017" />

    <TextView
        android:id="@+id/main_title"
        android:layout_width="147dp"
        android:layout_height="93dp"
        android:fontFamily="sans-serif-medium"
        android:text="@string/welcome_label"
        android:textColor="#FFFFFF"
        android:textSize="70sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_bias="0.414"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.049" />

    <Button
        android:id="@+id/monday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:contentDescription="@string/monday_context"
        android:text="@string/monday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.16"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.017" />

    <Button
        android:id="@+id/thursday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:text="@string/thursday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.018"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.172" />

    <Button
        android:id="@+id/sunday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:text="@string/sunday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="28sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.786"
        app:layout_constraintStart_toEndOf="@+id/saturday_btn"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.172" />

    <Button
        android:id="@+id/saturday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:text="@string/saturday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="28sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.225"
        app:layout_constraintStart_toEndOf="@+id/friday_btn"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.172" />

    <Button
        android:id="@+id/friday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:text="@string/friday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.137"
        app:layout_constraintStart_toEndOf="@+id/thursday_btn"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.172" />

    <Button
        android:id="@+id/wednesday_btn"
        android:layout_width="70dp"
        android:layout_height="70dp"
        android:background="@drawable/button_states"
        android:text="@string/wednesday"
        android:textAllCaps="false"
        android:textColor="@color/white"
        android:textSize="30sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.369"
        app:layout_constraintStart_toEndOf="@+id/tuesday_btn"
        app:layout_constraintTop_toBottomOf="@+id/main_title"
        app:layout_constraintVertical_bias="0.017" />

    <ImageView
        android:id="@+id/logo"
        android:layout_width="52dp"
        android:layout_height="58dp"
        android:layout_marginStart="8dp"
        android:layout_marginTop="52dp"
        android:contentDescription="@string/app_name"
        app:layout_constraintStart_toEndOf="@+id/main_title"
        app:layout_constraintTop_toTopOf="parent"
        app:srcCompat="@drawable/ic_logo" />

    <TextView
        android:id="@+id/current_user"
        android:layout_width="362dp"
        android:layout_height="27dp"
        android:text="@string/current_user"
        android:textAlignment="viewEnd"
        android:textSize="18sp"
        app:layout_constraintBottom_toTopOf="@+id/main_title"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.938"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.318" />

    <FrameLayout
        android:id="@+id/daysfragment"
        android:layout_width="match_parent"
        android:layout_height="460dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />


</androidx.constraintlayout.widget.ConstraintLayout>

MondayFragment.java

    package com.example.dietmanagement;

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;


public class MondayFragment extends Fragment {

    public TextView mondayTV;
    public ArrayList<String> hour_food;
    public ArrayAdapter<String> listViewAdapter;
    public ListView listView;
    public EditText input_meal;
    public EditText input_time;
    public Button submit;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_monday, container, false);

        mondayTV = (TextView) v.findViewById(R.id.day);
        Bundle bndMon = getArguments();
        String day = bndMon.getString("monday");
        mondayTV.setText(day);

        hour_food = new ArrayList<String>();
        listViewAdapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_1, hour_food);
        listView = (ListView)v.findViewById(R.id.monday_list_item);

        listView.setAdapter(listViewAdapter);

        listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                hour_food.remove(position);
                Toast.makeText(getActivity(), "Meal Removed", Toast.LENGTH_SHORT).show();
                listViewAdapter.notifyDataSetChanged();
                return true;
            }
        });

        input_meal = v.findViewById(R.id.input_meal);
        input_time = v.findViewById(R.id.input_time);

        submit = (Button) v.findViewById(R.id.submit_food_btn);
        submit.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(TextUtils.isEmpty(input_time.getText())) {
                    Toast.makeText(getActivity(), "Empty time input", Toast.LENGTH_SHORT).show();
                } else if(TextUtils.isEmpty(input_meal.getText())){
                    Toast.makeText(getActivity(), "Empty meal input", Toast.LENGTH_SHORT).show();
                }
                else
                {
                    hour_food.add(String.format("%s - %s", input_meal.getText().toString(), input_time.getText().toString()));
                    listViewAdapter.notifyDataSetChanged();
                    input_meal.setText("");
                    input_time.setText("");
                }
            }
        });

        return v;
    }
}

fragment_monday.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_green"
    tools:context=".MondayFragment">

    <TextView
        android:id="@+id/day"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="@string/day" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/input_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:autofillHints="@string/time"
            android:hint="@string/time"
            android:inputType="time" />

        <EditText
            android:id="@+id/input_meal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:autofillHints="@string/meal"
            android:hint="@string/meal"
            android:inputType="textAutoCorrect|textCapSentences" />

    </LinearLayout>

    <Button
        android:id="@+id/submit_food_btn_monday"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/submit"
        android:background="@color/white"
        android:textColor="@color/background_green"
        android:layout_gravity="end"
        android:layout_marginTop="10dp"/>


    <ListView
        android:id="@+id/monday_list_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />
</LinearLayout>

strings.xml

Answer 1

Create DayFragment and layout only for one day. Pass extra information for Fragment and handle situations for different days with that extra information (in your case it looks like only String from bundle is different).

fragment_day.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/background_green">

    <TextView
        android:id="@+id/day"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="24dp"
        android:text="@string/day" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <EditText
            android:id="@+id/input_time"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:autofillHints="@string/time"
            android:hint="@string/time"
            android:inputType="time" />

        <EditText
            android:id="@+id/input_meal"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:autofillHints="@string/meal"
            android:hint="@string/meal"
            android:inputType="textAutoCorrect|textCapSentences" />

    </LinearLayout>

    <Button
        android:id="@+id/submit_food_btn"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/submit"
        android:background="@color/white"
        android:textColor="@color/background_green"
        android:layout_gravity="end"
        android:layout_marginTop="10dp"/>

    <ListView
        android:id="@+id/list_item"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
</LinearLayout>

DayFragment.java

public class DayFragment extends Fragment {

    private TextView dayTV;
    private ArrayList<String> hour_food;
    private ArrayAdapter<String> listViewAdapter;
    private ListView listView;
    private EditText input_meal;
    private EditText input_time;
    private Button submit;
    private String text;

    public DayFragment(String text) {
        this.text = text;
    }

    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_day, container, false);

        dayTV = v.findViewById(R.id.day);
        dayTV.setText(text);

        hour_food = new ArrayList<>();
        listViewAdapter = new ArrayAdapter<>(getActivity(), android.R.layout.simple_list_item_1, hour_food);
        listView = v.findViewById(R.id.list_item);

        listView.setAdapter(listViewAdapter);

        listView.setOnItemLongClickListener((parent, view, position, id) -> {
            hour_food.remove(position);
            Toast.makeText(getActivity(), "Meal Removed", Toast.LENGTH_SHORT).show();
            listViewAdapter.notifyDataSetChanged();
            return true;
        });

        input_meal = v.findViewById(R.id.input_meal);
        input_time = v.findViewById(R.id.input_time);

        submit = v.findViewById(R.id.submit_food_btn);
        submit.setOnClickListener(v1 -> {
            if (TextUtils.isEmpty(input_time.getText())) {
                Toast.makeText(getActivity(), "Empty time input", Toast.LENGTH_SHORT).show();
            } else if (TextUtils.isEmpty(input_meal.getText())) {
                Toast.makeText(getActivity(), "Empty meal input", Toast.LENGTH_SHORT).show();
            } else {
                hour_food.add(String.format("%s - %s", input_meal.getText().toString(), input_time.getText().toString()));
                listViewAdapter.notifyDataSetChanged();
                input_meal.setText("");
                input_time.setText("");
            }
        });

        return v;
    }
}

Use constructor for passing information.

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button monday = findViewById(R.id.monday_btn),
                tuesday = findViewById(R.id.tuesday_btn),
                wednesday = findViewById(R.id.wednesday_btn),
                thursday = findViewById(R.id.thursday_btn),
                friday = findViewById(R.id.friday_btn),
                saturday = findViewById(R.id.saturday_btn),
                sunday = findViewById(R.id.sunday_btn);

        openFragment(monday);
        openFragment(tuesday);
        openFragment(wednesday);
        openFragment(thursday);
        openFragment(friday);
        openFragment(saturday);
        openFragment(sunday);
    }

    private void openFragment(Button btn) {
        btn.setOnClickListener(v -> {
            String contentDescription = btn.getContentDescription().toString();
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.daysfragment, new DayFragment(contentDescription))
                    .addToBackStack(null)
                    .commit();
        });
    }
}

In MainActivity openFragment() method takes a Button parameter and with that Button and sets onClickListener to that Button . When you click any Button it gets content description from that Button and passing it to Fragment and opens that Fragment with that content description.