Android开发：从Tomcat上下载MP3 带百分比进度条

1. package com.src.fpkj.Android;  
2.   
3. import com.src.fpkj.Android.down.DownFielToSdcard;  
4. import Android.app.Activity;  
5. import Android.os.Bundle;  
6. import Android.view.View;  
7. import Android.view.View.OnClickListener;  
8. import Android.widget.Button;  
9. /**  
10.  * 实现一个带进度条的下载dialog显示百分比，很喜欢这效果，感觉很真切  
11.  * @author 1314HWL  
12.  *  2011/10/10/23:01  
13.  */  
14. public class MainActivity extends Activity implements OnClickListener {  
15.     Button btn_downMP3;  
16.     String httpUrl = "http://10.0.2.2:8080/webdav/missyou.MP3";  
17.     public void onCreate(Bundle savedInstanceState) {  
18.         super.onCreate(savedInstanceState);  
19.         setContentView(R.layout.main);  
20.         btn_downMP3 = (Button) findViewById(R.id.btn_down);  
21.         btn_downMP3.setOnClickListener(this);  
22.     }  
23.   
24.     public void onClick(View v) {  
25.         switch (v.getId()) {  
26.         case R.id.btn_down:  
27.             DownFielToSdcard filedown = new DownFielToSdcard(MainActivity.this);  
28.             try {  
29.                 //httpUrl:tomcat 下载地址 test/sdcard中得路径      
30.                   
31.                 filedown.LoadToSdcard(httpUrl, "test/", "missyou.MP3");  
32.             } catch (Exception e1) {  
33.                 e1.printStackTrace();  
34.             }  
35.             break;  
36.         }  
37.   
38.     }  
39. }  
40.   
41.   
42. package com.src.fpkj.Android.down;  
43.   
44. import java.io.File;  
45. import java.io.FileOutputStream;  
46. import java.io.InputStream;  
47. import java.io.OutputStream;  
48. import java.net.HttpURLConnection;  
49. import java.net.URL;  
50. import com.src.fpkj.Android.R;  
51. import Android.app.AlertDialog;  
52. import Android.app.Dialog;  
53. import Android.content.Context;  
54. import Android.os.Environment;  
55. import Android.os.Handler;  
56. import Android.os.Message;  
57. import Android.util.Log;  
58. import Android.view.LayoutInflater;  
59. import Android.view.View;  
60. import Android.widget.ProgressBar;  
61. import Android.widget.TextView;  
62. import Android.widget.Toast;  
63.   
64. public class DownFielToSdcard {  
65.   
66.     private static String SDPath;  
67.     ProgressBar pb;  
68.     TextView tv_percent;  
69.     int downLoadFileSize, tatalsize;  //downLoadFileSize下载了多少， tatalsize总大小  
70.     Dialog dialog;  
71.     Context context;  
72.   
73.     public DownFielToSdcard(Context context) {  
74.         super();  
75.         this.context = context;  
76.         SDPath = Environment.getExternalStorageDirectory() + "/";// 得到的是/sdcard/  
77.     }  
78.   
79.     /**  
80.      * 在sdcard中创建文件  
81.      *   
82.      * @param fileName  
83.      * @return  
84.      * @throws Exception  
85.      */  
86.     public File CreateFile(String fileName) throws Exception {  
87.         File file = new File(SDPath + fileName);  
88.         file.createNewFile();  
89.         return file;  
90.     }  
91.   
92.     /**  
93.      * 创建目录  
94.      *   
95.      * @param fileName  
96.      * @return  
97.      * @throws Exception  
98.      */  
99.     public File CreateFileSdDir(String dirName) throws Exception {  
100.         File sdDir = new File(SDPath + dirName);  
101.         sdDir.mkdir();  
102.         return sdDir;  
103.     }  
104.   
105.     /**  
106.      * 判断文件是否存在  
107.      *   
108.      * @param fileName  
109.      * @return  
110.      */  
111.   
112.     public boolean FileExist(String fileName) {  
113.         File file = new File(SDPath + fileName);  
114.         return file.exists();  
115.     }  
116.   
117.     /**  
118.      * 思路：要下载文件，先得创建目录  
119.      */  
120.   
121.     public void LoadToSdcard(final String strUrl, final String path,  
122.             final String fileName) throws Exception {  
123.         if (FileExist("test/missyou.MP3")) {  
124.             Toast.makeText(context, R.string.filehaved, Toast.LENGTH_LONG)  
125.                     .show();  
126.         } else {  
127.   
128.             View view = LayoutInflater.from(context).inflate(  
129.                     R.layout.download_dialog_xml, null);  
130.             pb = (ProgressBar) view.findViewById(R.id.down_pb);  
131.             tv_percent = (TextView) view.findViewById(R.id.pro_int);  
132.             dialog = AlertDialogUtil(view, context,  
133.                     context.getString(R.string.waittingloading));  
134.             new Thread(new Runnable() {  
135.                 public void run() {  
136.                     try {  
137.                         URL url = new URL(strUrl);  
138.                         HttpURLConnection conection = (HttpURLConnection) url  
139.                                 .openConnection();  
140.                         tatalsize = conection.getContentLength();  
141.                         InputStream input = conection.getInputStream();  
142.                         File file = null;  
143.                         OutputStream outputstream = null;  
144.                         CreateFileSdDir(path);  
145.                         file = CreateFile(path + fileName);  
146.                         outputstream = new FileOutputStream(file);  
147.                         byte data[] = new byte[1024 * 4];  
148.                         sentMassage(0);  
149.                         while (true) {  
150.                             int temp = input.read(data);  
151.                             if (temp == -1) {  
152.                                 break;  
153.                             }  
154.                             outputstream.write(data, 0, temp);  
155.                             downLoadFileSize += temp;  
156.                             sentMassage(1);  
157.                         }  
158.                         sentMassage(2);  
159.                         outputstream.flush();  
160.                         outputstream.close();  
161.                         input.close();  
162.                     } catch (Exception e) {  
163.                         Toast.makeText(context, R.string.app_falls,  
164.                                 Toast.LENGTH_LONG).show();  
165.                         e.printStackTrace();  
166.                     }  
167.                 }  
168.   
169.             }).start();  
170.         }  
171.     }  
172.   
173.     /**  
174.      * 返回一个dialog  
175.      *   
176.      * @param view  
177.      * @param context  
178.      * @param string  
179.      * @return  
180.      */  
181.     private Dialog AlertDialogUtil(View view, Context context, String string) {  
182.         AlertDialog.Builder builder = new AlertDialog.Builder(context);  
183.         builder.setTitle(string);  
184.         builder.setIcon(R.drawable.icon);  
185.         builder.setView(view);  
186.         builder.create();  
187.         return builder.show();  
188.     }  
189.   
190.     /**  
191.      * handler 处理动作  
192.      */  
193.     Handler handler = new Handler() {  
194.         public void handleMessage(Message msg) {  
195.             super.handleMessage(msg);  
196.             switch (msg.what) {  
197.             case 0:  
198.                 pb.setMax(tatalsize);  
199.                 break;  
200.             case 1:  
201.                 pb.setProgress(downLoadFileSize);  
202.                 int result = downLoadFileSize * 100 / tatalsize;  
203.                 tv_percent.setText(context.getString(R.string.fileload)  
204.                         + result + "%");  
205.                 break;  
206.             case 2:  
207.                 dialog.dismiss();  
208.                 Toast.makeText(context, R.string.loagsucces, Toast.LENGTH_LONG)  
209.                         .show();  
210.                 Log.v("test", "--->
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     时间:2011-10-11 11:53 来源:LinuxIDC.com 作者:LinuxIDC.com 原文链接