android音乐播放器

 这个例子是播放音乐的一个小例子也比较简单，大家需要去下载2个.mp3结尾的歌曲，然后放到SD卡里边 进行测试，就可以看到效果了。 运行效果如下

效果图：

 

Java代码：

1. 
   
3. xmlns:android=""
   
4. android:orientation="vertical"
   
5. android:layout_width="fill_parent"
   
6. android:layout_height="fill_parent"
   
7. >
   
9. android:id="@id/android:list"
   
10. android:layout_width="fill_parent"
    
11. android:layout_height="fill_parent"
    
12. android:layout_weight="1"
    
13. android:drawSelectorOnTop="false"/>
    
15. android:id="@+id/LastImageButton"
    
16. android:layout_width="wrap_content"
    
17. android:layout_height="wrap_content"
    
18. android:layout_x="10px"
    
19. android:layout_y="70px"
    
20. android:src="@drawable/last"
    
21. />
    
23. android:id="@+id/StopImageButton"
    
24. android:layout_height="wrap_content"
    
25. android:layout_width="wrap_content"
    
26. android:layout_x="70px"
    
27. android:layout_y="70px"
    
28. android:src="@drawable/stop"
    
29. />
    
31. android:id="@+id/StartImageButton"
    
32. android:layout_height="wrap_content"
    
33. android:layout_width="wrap_content"
    
34. android:layout_x="130px"
    
35. android:layout_y="70px"
    
36. android:src="@drawable/start"
    
37. />
    
39. android:id="@+id/PauseImageButton"
    
40. android:layout_height="wrap_content"
    
41. android:layout_width="wrap_content"
    
42. android:layout_x="190px"
    
43. android:layout_y="70px"
    
44. android:src="@drawable/pause"
    
45. />
    
47. android:id="@+id/NextImageButton"
    
48. android:layout_width="wrap_content"
    
49. android:layout_height="wrap_content"
    
50. android:layout_x="250px"
    
51. android:layout_y="70px"
    
52. android:src="@drawable/next"
    
53. />
    

复制代码

musicitme.xml

Java代码：

1. 
   
3. android:id="@+id/TextView01"
   
4. android:layout_width="fill_parent"
   
5. android:layout_height="wrap_content"
   
6. android:text="@string/hello"/>

复制代码

只有一个类 Activity1

Java代码：

1. package eoe.demo;
   
2. 
   
3. import java.io.File;
   
4. import java.io.FilenameFilter;
   
5. import java.io.IOException;
   
6. import java.util.ArrayList;
   
7. import java.util.List;
   
8. import android.app.ListActivity;
   
9. import android.media.MediaPlayer;
   
10. import android.media.MediaPlayer.OnCompletionListener;
    
11. import android.os.Bundle;
    
12. import android.view.KeyEvent;
    
13. import android.view.View;
    
14. import android.widget.ArrayAdapter;
    
15. import android.widget.ImageButton;
    
16. import android.widget.ListView;
    
17. 
    
18. public class Activity01 extends ListActivity
    
19. {
    
20. /* 几个操作按钮 */
    
21. private ImageButton mFrontImageButton = null;
    
22. private ImageButton mStopImageButton = null;
    
23. private ImageButton mStartImageButton = null;
    
24. private ImageButton mPauseImageButton = null;
    
25. private ImageButton mNextImageButton = null;
    
26. 
    
27. /* MediaPlayer对象 */
    
28. public MediaPlayer mMediaPlayer = null;
    
29. 
    
30. /* 播放列表 */
    
31. private List mMusicList = new ArrayList();
    
32. 
    
33. /* 当前播放歌曲的索引 */
    
34. private int currentListItme = 0;
    
35. 
    
36. /* 音乐的路径 */
    
37. private static final String MUSIC_PATH = new String("/sdcard/");
    
38. 
    
39. /** Called when the activity is first created. */
    
40. @Override
    
41. public void onCreate(Bundle savedInstanceState)
    
42. {
    
43. super.onCreate(savedInstanceState);
    
44. setContentView(R.layout.main);
    
45. /* 更新显示播放列表 */
    
46. musicList();
    
47. /* 构建MediaPlayer对象 */
    
48. mMediaPlayer = new MediaPlayer();
    
49. 
    
50. mFrontImageButton = (ImageButton) findViewById(R.id.LastImageButton);
    
51. mStopImageButton = (ImageButton) findViewById(R.id.StopImageButton);
    
52. mStartImageButton = (ImageButton) findViewById(R.id.StartImageButton);
    
53. mPauseImageButton = (ImageButton) findViewById(R.id.PauseImageButton);
    
54. mNextImageButton = (ImageButton) findViewById(R.id.NextImageButton);
    
55. 
    
56. //停止按钮
    
57. mStopImageButton.setOnClickListener(new ImageButton.OnClickListener()
    
58. {
    
59. @Override
    
60. public void onClick(View v)
    
61. {
    
62. /* 是否正在播放 */
    
63. if (mMediaPlayer.isPlaying())
    
64. {
    
65. //重置MediaPlayer到初始状态
    
66. mMediaPlayer.reset();
    
67. }
    
68. }
    
69. });
    
70. 
    
71. //开始按钮
    
72. mStartImageButton.setOnClickListener(new ImageButton.OnClickListener()
    
73. {
    
74. @Override
    
75. public void onClick(View v)
    
76. {
    
77. playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
    
78. }
    
79. });
    
80. 
    
81. //暂停
    
82. mPauseImageButton.setOnClickListener(new ImageButton.OnClickListener()
    
83. {
    
84. public void onClick(View view)
    
85. {
    
86. if (mMediaPlayer.isPlaying())
    
87. {
    
88. /* 暂停 */
    
89. mMediaPlayer.pause();
    
90. }
    
91. else
    
92. {
    
93. /* 开始播放 */
    
94. mMediaPlayer.start();
    
95. }
    
96. }
    
97. });
    
98. 
    
99. //下一首
    
100. mNextImageButton.setOnClickListener(new ImageButton.OnClickListener()
     
101. {
     
102. @Override
     
103. public void onClick(View arg0)
     
104. {
     
105. nextMusic();
     
106. }
     
107. });
     
108. //上一首
     
109. mFrontImageButton.setOnClickListener(new ImageButton.OnClickListener()
     
110. {
     
111. @Override
     
112. public void onClick(View arg0)
     
113. {
     
114. FrontMusic();
     
115. }
     
116. });
     
117. }
     
118. 
     
119. public boolean onKeyDown(int keyCode, KeyEvent event)
     
120. {
     
121. if ( keyCode == KeyEvent.KEYCODE_BACK)
     
122. {
     
123. mMediaPlayer.stop();
     
124. mMediaPlayer.release();
     
125. this.finish();
     
126. return true;
     
127. }
     
128. return super.onKeyDown(keyCode, event);
     
129. }
     
130. 
     
131. @Override
     
132. /* 当我们点击列表时，播放被点击的音乐 */
     
133. protected void onListItemClick(ListView l, View v, int position, long id)
     
134. {
     
135. currentListItme = position;
     
136. playMusic(MUSIC_PATH + mMusicList.get(position));
     
137. }
     
138. 
     
139. /* 播放列表 */
     
140. public void musicList()
     
141. {
     
142. //取得指定位置的文件设置显示到播放列表
     
143. File home = new File(MUSIC_PATH);
     
144. if (home.listFiles(new MusicFilter()).length > 0)
     
145. {
     
146. for (File file : home.listFiles(new MusicFilter()))
     
147. {
     
148. mMusicList.add(file.getName());
     
149. }
     
150. ArrayAdapter musicList = new ArrayAdapter(Activity01.this,R.layout.musicitme, mMusicList);
     
151. setListAdapter(musicList);
     
152. }
     
153. }
     
154. 
     
155. private void playMusic(String path)
     
156. {
     
157. try
     
158. {
     
159. /* 重置MediaPlayer */
     
160. mMediaPlayer.reset();
     
161. /* 设置要播放的文件的路径 */
     
162. mMediaPlayer.setDataSource(path);
     
163. /* 准备播放 */
     
164. mMediaPlayer.prepare();
     
165. /* 开始播放 */
     
166. mMediaPlayer.start();
     
167. mMediaPlayer.setOnCompletionListener(new OnCompletionListener()
     
168. {
     
169. public void onCompletion(MediaPlayer arg0)
     
170. {
     
171. //播放完成一首之后进行下一首
     
172. nextMusic();
     
173. }
     
174. });
     
175. }catch (IOException e){}
     
176. }
     
177. 
     
178. /* 下一首 */
     
179. private void nextMusic()
     
180. {
     
181. if (++currentListItme >= mMusicList.size())
     
182. {
     
183. currentListItme = 0;
     
184. }
     
185. else
     
186. {
     
187. playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
     
188. }
     
189. }
     
190. 
     
191. /* 上一首 */
     
192. private void FrontMusic()
     
193. {
     
194. if (--currentListItme >= 0)
     
195. {
     
196. currentListItme = mMusicList.size();
     
197. }
     
198. else
     
199. {
     
200. playMusic(MUSIC_PATH + mMusicList.get(currentListItme));
     
201. }
     
202. }
     
203. 
     
204. }
     
205. 
     
206. /* 过滤文件类型 */
     
207. class MusicFilter implements FilenameFilter
     
208. {
     
209. public boolean accept(File dir, String name)
     
210. {
     
211. //这里还可以设置其他格式的音乐文件
     
212. return (name.endsWith(".mp3"));
     
213. }
     
214. }