In this video it shows how one can implement a pop-up floating window and control certain elements, such as text size, using the seekbar. It uses the progress attribute of the seekbar to set the respective size of the text in the text view.

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Source Code:

package com.programmerworld.sizeoftextseekbar;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.widget.PopupWindow;
import android.widget.SeekBar;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    private SeekBar seekBar;
    private TextView textView;
    private View viewPopUpWindow;

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

        LayoutInflater layoutInflater = (LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE);
        viewPopUpWindow = layoutInflater.inflate(R.layout.popupwindow, null);

        seekBar = viewPopUpWindow.findViewById(R.id.seekBar);
        textView = viewPopUpWindow.findViewById(R.id.textView);

        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
                textView.setTextSize(i/3);
            }
            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
            }
            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
            }
        });
    }

    public void buttonPopUp(View view){
        final PopupWindow popupWindow = new PopupWindow(viewPopUpWindow, 800, 500, true);
        popupWindow.showAtLocation(view, Gravity.BOTTOM, 0,0);

        viewPopUpWindow.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View view, MotionEvent motionEvent) {
                popupWindow.dismiss();
                return false;
            }
        });
    }
}

<?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">

    <Button
        android:id="@+id/button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="88dp"
        android:layout_marginTop="44dp"
        android:onClick="buttonPopUp"
        android:text="Pop Up Window"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>

<?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:id="@+id/popupwindow"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#B1A8A8">

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="279dp"
        android:layout_height="37dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="16dp"
        android:progress="50"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="276dp"
        android:layout_height="107dp"
        android:layout_marginStart="16dp"
        android:layout_marginTop="27dp"
        android:text="Pop up window Text here ..."
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/seekBar" />
</androidx.constraintlayout.widget.ConstraintLayout>