android开发_SeekBar进度条

项目结构：

1 New Android Project->
2 Project name:SeekBar
3 Build Target:Android 2.2
4 Application name: SeekBar
5 Package name:com.b510
6 Create Activity:HelloSeekBar
7 Min SDK Version:9
8 Finish

运行效果：

代码部分：

main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="fill_parent"
 5     android:layout_height="fill_parent"
 6     >
 7     <TextView  
 8         android:layout_width="fill_parent" 
 9         android:layout_height="wrap_content" 
10         android:text="Seek Bar Demo"
11         />
12      <SeekBar
13          android:id="@+id/sb_test_id"
14          android:layout_width="fill_parent"
15          android:layout_height="wrap_content"
16      />   
17 </LinearLayout>

HelloSeekBar.java

 1 package com.b510;
 2 
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.util.Log;
 6 import android.widget.SeekBar;
 7 import android.widget.Toast;
 8 import android.widget.SeekBar.OnSeekBarChangeListener;
 9 
10 public class HelloSeekBar extends Activity {
11     private static final String TAG = "HelloSeekBar";
12     /* 申明一个SeekBar变量 */
13     private SeekBar sb_test;
14     
15     /** Called when the activity is first created. */
16     @Override
17     public void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.main);
20 
21         sb_test = (SeekBar) findViewById(R.id.sb_test_id);
22         // 进度条的最大值
23         sb_test.setMax(100);
24         sb_test.setOnSeekBarChangeListener(listener);
25     }
26     
27     // 定义一个监听器，该监听器负责监听进度条状态的改变
28     private OnSeekBarChangeListener listener = new OnSeekBarChangeListener() {
29         // 当用户停止滑动滑块的时候，调用此方法
30         @Override
31         public void onStopTrackingTouch(SeekBar seekBar) {
32             Log.i(TAG, "on  Stop  Tracking  Touch方法,当前位置: "
33                     + seekBar.getProgress());
34             Toast.makeText(HelloSeekBar.this, "onStopTrackingTouch方法",
35                     Toast.LENGTH_LONG).show();
36         }
37 
38         // 当用户开始滑动滑块的时候，调用此方法
39         @Override
40         public void onStartTrackingTouch(SeekBar seekBar) {
41             Log.i(TAG, "on    Start   Tracking   Touch方法,当前位置: "
42                     + seekBar.getProgress());
43             Toast.makeText(HelloSeekBar.this, "onStartTrackingTouch方法",
44                     Toast.LENGTH_LONG).show();
45         }
46 
47         // 当进度条的进度方式变化的时候，就会调用这个方法
48         // 只要进度条的滑块发生变化，无论滑块是怎样变化的，都会调用此方法
49         @Override
50         public void onProgressChanged(SeekBar seekBar, int progress,
51                 boolean fromUser) {
52             Log.i(TAG, "on  Progress   Changed方法,当前位置: "
53                     + seekBar.getProgress());
54             Toast.makeText(HelloSeekBar.this, "onProgressChanged方法",
55                     Toast.LENGTH_LONG).show();
56         }
57     };
58 }