Android开发 SeekBar（拖动条）的使用

心已赠人 2022-12-30 15:53 134阅读 0赞

> 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

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg5MzkwMg_size_16_color_FFFFFF_t_70][]

### 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) {
    
                }
            });
        }
    
    
    }

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDg5MzkwMg_size_16_color_FFFFFF_t_70]: /images/20221120/c420ebda1a9c4b7388ba67bb122e982c.png