Android development of the use of SeekBar (drag bar)

SeekBar is a subclass of Progress. Progress is mainly used to display progress, but cannot interact with users, while SeekBar can be dragged by users to change the progress value

Realize the dragging progress bar and display it in the text:

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <SeekBar
        android:id="@+id/seekBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="20dp"
        android:progress="30"/>

    <TextView
        android:id="@+id/tvProgress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="数值范围0~100之间，当前值：30"
        android:textSize="20sp"
        android:gravity="center"/>

</LinearLayout>

package com.example.jiandanduihuakuang;

import androidx.appcompat.app.AlertDialog;
import androidx.appcompat.app.AppCompatActivity;

import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    private SeekBar seekBar;
    private TextView tvProgress;

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

        //初始化控件
        seekBar = findViewById(R.id.seekBar);
        tvProgress = findViewById(R.id.tvProgress);
        //注册拖动监听器
        seekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                //将seekBar的进度设置在textView上
                tvProgress.setText("数值范围0~100之间，当前值："+progress);
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {

            }
        });
    }


}