SeekBar是Progress的子类，Progress主要用来显示进度，但是不能和用户互动，而SeekBar则可以供用户进行拖动改变进度值
实现拖动进度条并显示在文本中：
<?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) { } }); } }
