Dialog Fragment RGB, passes values back to Activity

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"
    tools:context=".MainActivity">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.5" />

    <TextView
        android:id="@+id/tvSwatch"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="16dp"
        android:layout_marginBottom="16dp"
        android:background="@android:color/darker_gray"
        app:layout_constraintBottom_toTopOf="@+id/guideline"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="#"
        android:textSize="72sp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/guideline" />

</androidx.constraintlayout.widget.ConstraintLayout>

edit_color_dialog.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">

    <SeekBar
        android:id="@+id/sbBlue"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="24dp"
        android:max="255"
        android:progress="127"
        app:layout_constraintBottom_toTopOf="@+id/tvSwatch"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/sbGreen" />

    <SeekBar
        android:id="@+id/sbGreen"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginEnd="24dp"
        android:max="255"
        android:progress="127"
        app:layout_constraintBottom_toTopOf="@+id/sbBlue"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/sbRed" />

    <SeekBar
        android:id="@+id/sbRed"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="24dp"
        android:layout_marginTop="24dp"
        android:layout_marginEnd="24dp"
        android:max="255"
        android:progress="127"
        app:layout_constraintBottom_toTopOf="@+id/sbGreen"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/tvSwatch"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="#7F7F7F"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.5"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/sbBlue" />
</androidx.constraintlayout.widget.ConstraintLayout>

EditDialogFragment.java

package edu.ggc.lutz.dialogfragmentrgbpractice1sep;

import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.graphics.Color;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.SeekBar;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.AlertDialog;
import androidx.fragment.app.DialogFragment;

public class EditDialogFragment extends DialogFragment {

    private static final String LOG_TAG = "RGBDialog";
    private SeekBar sbRed, sbGreen, sbBlue;
    private TextView tvSwatch;

    private OnColorChangeListener colorListener;

    public interface OnColorChangeListener {
        void onColorChanged(int red, int green, int blue);

    }

    @NonNull
    @Override
    public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(R.string.new_sel_rgb);

        LayoutInflater inflater = requireActivity().getLayoutInflater();    // set the custom layout
        View dialogView = inflater.inflate(R.layout.edit_color_dialog, null);

        builder.setView(dialogView);

        tvSwatch = dialogView.findViewById(R.id.tvSwatch);

        sbRed = dialogView.findViewById(R.id.sbRed);
        sbRed.getProgressDrawable().setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);
        sbRed.getThumb().setColorFilter(Color.RED, PorterDuff.Mode.SRC_IN);


        sbGreen = dialogView.findViewById(R.id.sbGreen);
        sbGreen.getProgressDrawable().setColorFilter(Color.GREEN, PorterDuff.Mode.SRC_IN);
        sbGreen.getThumb().setColorFilter(Color.GREEN, PorterDuff.Mode.SRC_IN);

        sbBlue = dialogView.findViewById(R.id.sbBlue);
        sbBlue.getProgressDrawable().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);
        sbBlue.getThumb().setColorFilter(Color.BLUE, PorterDuff.Mode.SRC_IN);

        final SeekBar.OnSeekBarChangeListener listener = new SeekBar.OnSeekBarChangeListener()  {

            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                int bg = Color.rgb(sbRed.getProgress(),sbGreen.getProgress(),sbBlue.getProgress());
                tvSwatch.setBackgroundColor(bg);

            }

            @Override public void onStartTrackingTouch(SeekBar seekBar) { }
            @Override public void onStopTrackingTouch(SeekBar seekBar) { }
        };

        sbRed.setOnSeekBarChangeListener(listener);
        sbGreen.setOnSeekBarChangeListener(listener);
        sbBlue.setOnSeekBarChangeListener(listener);

        builder.setPositiveButton(R.string.start, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                Log.v(LOG_TAG, "clicked Save.");
                colorListener.onColorChanged(sbRed.getProgress(),sbGreen.getProgress(),sbBlue.getProgress());
            }
        });

        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int id) {
                Log.v(LOG_TAG, "clicked cancel.");
            }
        });

        return builder.create();
    }

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);
        this.colorListener = (OnColorChangeListener) context;
    }
}

MainActivity.java

package edu.ggc.lutz.dialogfragmentrgbpractice1sep;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;

import android.graphics.Color;
import android.graphics.PorterDuff;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.SeekBar;
import android.widget.TextView;

import java.util.zip.Inflater;

public class MainActivity extends AppCompatActivity implements EditDialogFragment.OnColorChangeListener {

    private TextView tvSwatch;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tvSwatch = findViewById(R.id.tvSwatch);
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {

        if (item.getItemId() == R.id.action_edit) {
            FragmentManager manager = getSupportFragmentManager();
            EditDialogFragment dialog = new EditDialogFragment();
            dialog.show(manager, "edittDialog");
        }
        return true;
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return super.onCreateOptionsMenu(menu);
    }

    @Override
    public void onColorChanged(int red, int green, int blue) {
        int bg = Color.rgb(red,green,blue);
        tvSwatch.setBackgroundColor(bg);
    }
}

menu_main.xml

<menu 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"
    tools:context="edu.ggc.lutz.basicdeleteme.MainActivity">

    <item
        android:id="@+id/action_edit"
        android:icon="@android:drawable/ic_menu_edit"
        android:title="@string/action_add"
        app:showAsAction="ifRoom" />
    <item
        android:id="@+id/action_settings"
        android:orderInCategory="100"
        android:title="@string/action_settings"
        app:showAsAction="never" />


</menu>

strings.xml

<resources>
    <string name="app_name">DialogFragment RGB</string>
    <string name="action_add">Edit</string>
    <string name="action_settings">Settings</string>
    <string name="new_sel_rgb">Select RGB</string>
    <string name="start">Save</string>
    <string name="cancel">Cancel</string>
</resources>