Android開發：從Tomcat上下載MP3 帶百分比進度條

Android開發：從Tomcat上下載MP3 帶百分比進度條

1. package com.src.fpkj.android;
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. * 實現一個帶進度條的下載dialog顯示百分比，很喜歡這效果，感覺很真切
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. }
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 下載地址 test/sdcard中得路徑
31. filedown.LoadToSdcard(httpUrl, "test/", "missyou.mp3");
32. } catch (Exception e1) {
33. e1.printStackTrace();
34. }
35. break;
36. }
38. }
39. }
42. package com.src.fpkj.android.down;
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;
64. public class DownFielToSdcard {
66. private static String SDPath;
67. ProgressBar pb;
68. TextView tv_percent;
69. int downLoadFileSize, tatalsize; //downLoadFileSize下載了多少， tatalsize總大小
70. Dialog dialog;
71. Context context;
73. public DownFielToSdcard(Context context) {
74. super();
75. this.context = context;
76. SDPath = Environment.getExternalStorageDirectory() + "/";// 得到的是/sdcard/
77. }
79. /**
80. * 在sdcard中創建文件
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. }
92. /**
93. * 創建目錄
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. }
105. /**
106. * 判斷文件是否存在
107. *
108. * @param fileName
109. * @return
110. */
112. public boolean FileExist(String fileName) {
113. File file = new File(SDPath + fileName);
114. return file.exists();
115. }
117. /**
118. * 思路：要下載文件，先得創建目錄
119. */
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 {
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. }
169. }).start();
170. }
171. }
173. /**
174. * 返回一個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. }
190. /**
191. * handler 處理動作
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", "--->>> " + "end");
211. break;
212. }
214. }
215. };
217. /**
218. *
219. * @param flag
220. * 消息類型
221. */
223. public void sentMassage(int flag) {
224. Message msg = new Message();
225. msg.what = flag;
226. handler.sendMessage(msg);
227. }
229. }

1. <?xml version="1.0" encoding="utf-8"?>
2. <resources>
3. <string name="hello">Hello World, MainActivity!</string>
4. <string name="app_name">LoadDownFile</string>
5. <string name="loagsucces">下載成功</string>
6. <string name="app_falls">下載失敗</string>
7. <string name="waittingloading">正在下載請稍後……</string>
8. <string name="filehaved">文件已存在</string>
9. <string name="fileload">文件下載</string>
10. </resources>