SeekBar控件

最新推荐文章于 2025-05-27 17:21:32 发布

n567656756765676567

最新推荐文章于 2025-05-27 17:21:32 发布

阅读量1.5k

点赞数

分类专栏： Anroid 文章标签： android layout import exception encoding float

Anroid 专栏收录该内容

12 篇文章

订阅专栏

本文深入探讨SeekBar控件的功能、使用方法及其实现细节，包括如何通过代码实现进度条的动态更新、亮度调整等功能，并提供了完整的代码示例。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

什么是SeekBar控件,SeekBar控件其实就是一个高级点的进度条，就像我们在听歌，看电影用的播放器上的进度条一样，是可以拖动的，可以改变进度的一个进度条控件！就是下面这个样子

seekbar对应的方法和属性

android:thumb---seekbar上绘制的thumb（可拖动的那个图标）

 
   1public  void setOnSeekBarChangeListener (SeekBar.OnSeekBarChangeListener l) 
 
   2  
 
   3//设置一个监听器以接受seekbar进度改变时的通知。同时提供用户在SeekBar上开始和停止触摸手势时的通知。 
 
   4  
 
   5//参数 l        SeekBar的通知监听对象  
 
   6  
 
   7//参见     SeekBar.OnSeekBarChangeListener

1.在res/layout目录下定义一个布局文件seekbar.xml

 
   01<?xml version="1.0" encoding="utf-8"?> 
 
   02<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
 
   03    android:layout_width="fill_parent"
 
   04    android:layout_height="fill_parent"
 
   05    >  
 
   06    <LinearLayout 
 
   07        android:layout_width="fill_parent"
 
   08        android:layout_height="fill_parent"
 
   09         android:orientation="vertical"
 
   10        > 
 
   11            <TextView 
 
   12                android:id="@+id/text"
 
   13                android:layout_width="fill_parent" 
 
   14                android:layout_height="wrap_content" 
 
   15                android:text="我是SeekBar=进度为："
 
   16                android:lines="2"
 
   17                android:textColor="#11ddff"
 
   18               /> 
 
   19            <SeekBar 
 
   20                 android:id="@+id/seekbar_btn_id"
 
   21                 android:layout_width="fill_parent"
 
   22                 android:layout_height="wrap_content"
 
   23             /> 
 
   24            <ImageView 
 
   25                android:id="@+id/seekbar_imageview_id"
 
   26                android:layout_width="fill_parent" 
 
   27                android:layout_height="wrap_content" 
 
   28                android:src="@drawable/gallery_01"
 
   29                android:lines="6"
 
   30                android:textColor="#11ddff"
 
   31                /> 
 
   32            <LinearLayout 
 
   33                    android:layout_width="fill_parent"
 
   34                    android:layout_height="fill_parent"
 
   35                     android:orientation="horizontal"> 
 
   36                    <TextView 
 
   37                       android:layout_width="wrap_content" 
 
   38                        android:layout_height="wrap_content"
 
   39                        android:text="拖到切换图片"
 
   40                        /> 
 
   41                    <SeekBar 
 
   42                     android:id="@+id/seekbar_hand_id"
 
   43                     android:layout_width="fill_parent"
 
   44                     android:layout_height="wrap_content"
 
   45                     /> 
 
   46             </LinearLayout> 
 
   47             <LinearLayout 
 
   48                    android:layout_width="fill_parent"
 
   49                    android:layout_height="fill_parent"
 
   50                     android:orientation="horizontal"> 
 
   51                       <TextView 
 
   52                        android:id="@+id/seekbar_liang_id"
 
   53                        android:layout_width="wrap_content" 
 
   54                        android:layout_height="wrap_content" 
 
   55                        android:text="改变屏幕亮度"
 
   56                        android:textColor="#11ddff"
 
   57                       /> 
 
   58                        <SeekBar 
 
   59                             android:id="@+id/seekbar_hang_id1"
 
   60                             android:layout_width="fill_parent"
 
   61                             android:layout_height="wrap_content"
 
   62                         /> 
 
   63             </LinearLayout> 
 
   64      </LinearLayout> 
 
   65</ScrollView>

2.代码文件SeekBarDemo.java如下：

 
   001package  com.test; 
 
   002  
 
   003import  android.app.Activity; 
 
   004import  android.content.Intent; 
 
   005import  android.os.Bundle; 
 
   006import  android.os.Handler; 
 
   007import  android.text.method.ScrollingMovementMethod; 
 
   008import  android.view.View; 
 
   009import  android.view.WindowManager; 
 
   010import  android.view.View.OnClickListener; 
 
   011import  android.widget.Button; 
 
   012import  android.widget.ImageView; 
 
   013import  android.widget.SeekBar; 
 
   014import  android.widget.SeekBar.OnSeekBarChangeListener; 
 
   015import  android.widget.TextView; 
 
   016  
 
   017public  class SeekBarDemo extends Activity { 
 
   018      
 
   019    private SeekBar  seekBar,seekBar2,seekBar3; 
 
   020    private TextView textview,textview2; 
 
   021    private  ImageView  imageView; 
 
   022    //标记是否需要刷新 
 
   023    private boolean flag=true; 
 
   024    private Handler hangler=new Handler(); 
 
   025    //// 
 
   026    private  int []  arrayImage =new int[]{R.drawable.gallery_01, 
 
   027            R.drawable.gallery_02,R.drawable.gallery_03,R.drawable.gallery_04,R.drawable.gallery_05,R.drawable.gallery_06}; 
 
   028      
 
   029    @Override
 
   030    protected void onCreate(Bundle savedInstanceState) { 
 
   031        // TODO Auto-generated method stub 
 
   032        super.onCreate(savedInstanceState); 
 
   033        setContentView(R.layout.seekbar); 
 
   034          
 
   035        seekBar=(SeekBar)findViewById(R.id.seekbar_btn_id); 
 
   036        seekBar2=(SeekBar)findViewById(R.id.seekbar_hand_id);//第二个 
 
   037        seekBar2=(SeekBar)findViewById(R.id.seekbar_hand_id);//第二个 
 
   038        seekBar3=(SeekBar)findViewById(R.id.seekbar_hang_id1);//第san个 
 
   039        textview=(TextView)findViewById(R.id.text); 
 
   040        //设置拖动条的最大值，其将为该拖动条显示的基数 
 
   041        seekBar.setMax(100); 
 
   042        //为该方法seekbar注册一个监听，当seekbar发生改变时调用1中的对应方法 
 
   043        seekBar.setOnSeekBarChangeListener(onSeekbar); 
 
   044        imageView = (ImageView)findViewById(R.id.seekbar_imageview_id); 
 
   045        refresh(); 
 
   046        /////// 
 
   047         this.seekBar2.setMax(arrayImage.length); 
 
   048        this.seekBar3.setMax(100); 
 
   049        this.seekBar2.setOnSeekBarChangeListener(seekbar); 
 
   050        this.seekBar3.setOnSeekBarChangeListener(seekbar); 
 
   051    }  
 
   052    //第二个seekBar 
 
   053    private  OnSeekBarChangeListener  seekbar = new OnSeekBarChangeListener() { 
 
   054          
 
   055        @Override
 
   056        public void onStopTrackingTouch(SeekBar seekBar) { 
 
   057            // TODO Auto-generated method stub 
 
   058              
 
   059        } 
 
   060          
 
   061        @Override
 
   062        public void onStartTrackingTouch(SeekBar seekBar) { 
 
   063            // TODO Auto-generated method stub 
 
   064              
 
   065        } 
 
   066          
 
   067        @Override
 
   068        public void onProgressChanged(SeekBar seekBar, int progress,  
 
   069                boolean fromUser) { 
 
   070            // TODO Auto-generated method stub 
 
   071            if(seekBar.getId()==R.id.seekbar_hand_id) 
 
   072            { 
 
   073                imageView.setImageResource(arrayImage[seekBar2.getProgress()]); 
 
   074            } 
 
   075            if(seekBar.getId()==R.id.seekbar_hang_id1) 
 
   076            { 
 
   077                setScreenBrightness((float) seekBar 
 
   078                        .getProgress() / 100); 
 
   079            } 
 
   080          
 
   081              
 
   082        } 
 
   083    };  
 
   084    //表示屏幕亮度的方法 
 
   085    private void setScreenBrightness(float num) {   // 0 ~ 1表示亮度 
 
   086        WindowManager.LayoutParams layoutParams = super.getWindow().getAttributes() ;   // 取得屏幕的属性 
 
   087        layoutParams.screenBrightness = num ;   // 设置屏幕亮度 
 
   088        super.getWindow().setAttributes(layoutParams) ; // 重新设置窗口的属性 
 
   089    }  
 
   090    //第一个sekbar 
 
   091    private  OnSeekBarChangeListener  onSeekbar=new OnSeekBarChangeListener() { 
 
   092          
 
   093        @Override
 
   094        //当游标移动停止的时候调用该方法 
 
   095        public void onStopTrackingTouch(SeekBar seekBar) { 
 
   096        //设置标记为需要刷新 
 
   097            flag=true; 
 
   098       //创建时就开始自动更新该拖动条 
 
   099            refresh(); 
 
   100        } 
 
   101          
 
   102          
 
   103        @Override
 
   104        //当游标开始移动时调用该方法 
 
   105        public void onStartTrackingTouch(SeekBar seekBar) { 
 
   106        //停止刷新 
 
   107            flag=false; 
 
   108        } 
 
   109          
 
   110        @Override
 
   111        //当进度条游标被改变或者进度条改变时调用该方法 
 
   112        public void onProgressChanged(SeekBar seekBar, int progress,  
 
   113                boolean fromUser) { 
 
   114            //更改textView的内容 
 
   115            textview.setText("进度为："+progress+"%"); 
 
   116              
 
   117        } 
 
   118          
 
   119    };  
 
   120    //该方法自动更新该拖动条 
 
   121    private void refresh() {  
 
   122        new Thread(new  Runnable() { 
 
   123              
 
   124            @Override
 
   125            public void run() { 
 
   126                // TODO Auto-generated method stub 
 
   127                //当进度不到1000，就更新status 
 
   128                while(flag && seekBar.getProgress()<100) 
 
   129                { 
 
   130                    try { 
 
   131                        //暂停1秒 
 
   132                        Thread.sleep(1000); 
 
   133                    } catch (InterruptedException e) { 
 
   134                        // TODO: handle exception 
 
   135                        e.printStackTrace(); 
 
   136                    } 
 
   137                    //将一个Runnable对象添加到消息队列当中， 
 
   138                    //并且当执行到该对象时执行run()方法 
 
   139                    hangler.post(new Runnable() { 
 
   140                          
 
   141                        @Override
 
   142                        public void run() { 
 
   143                            // 重新设置进度条当前的值 
 
   144                            seekBar.setProgress(seekBar.getProgress()+1); 
 
   145                              
 
   146                        } 
 
   147                    }); 
 
   148                } 
 
   149            } 
 
   150        }).start(); 
 
   151       } 
 
   152}

三：执行效果如下：