音乐播放器的实现

strings.xml

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1. <?xml version="1.0" encoding="utf-8"?>
2. <resources>
4. <string name="app_name">MusicPlayer</string>
5. <string name="music_name">曲目</string>
6. <string name="play_text">播放</string>
7. <string name="pause_text">暂停</string>
8. <string name="continue_text">继续</string>
9. <string name="reset_text">重置</string>
10. <string name="stop_text">停止</string>
11. <string name="choose_text">选择</string>
12. <string name="notfoundfile_text">媒体文件不存在</string>
13. <string name="notfoundSdcard_text">SDcard不存在</string>
15. </resources>

<?xml version="1.0" encoding="utf-8"?> <resources> <string name="app_name">MusicPlayer</string> <string name="music_name">曲目</string> <string name="play_text">播放</string> <string name="pause_text">暂停</string> <string name="continue_text">继续</string> <string name="reset_text">重置</string> <string name="stop_text">停止</string> <string name="choose_text">选择</string> <string name="notfoundfile_text">媒体文件不存在</string> <string name="notfoundSdcard_text">SDcard不存在</string> </resources>

main.xml

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1. <?xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:layout_width="fill_parent"
4. android:layout_height="fill_parent"
5. android:orientation="vertical" >
7. <TextView
8. android:layout_width="fill_parent"
9. android:layout_height="wrap_content"
10. android:text="@string/music_name" />
12. <TableLayout
13. android:layout_width="fill_parent"
14. android:layout_height="wrap_content"
15. android:stretchColumns="0" >
17. <TableRow >
18. <EditText
19. android:id="@+id/musicEt"
20. android:layout_width="fill_parent"
21. android:layout_height="wrap_content"
22. android:text="l.mp3" />
24. <Button
25. android:id="@+id/chooseBtn"
26. android:layout_width="wrap_content"
27. android:layout_height="wrap_content"
28. android:text="@string/choose_text" />
30. </TableRow>
31. </TableLayout>
33. <SeekBar
34. android:id="@+id/seekBar"
35. android:layout_width="fill_parent"
36. android:layout_height="wrap_content" />
37. <SeekBar
38. android:id="@+id/seekBarSound"
39. android:layout_width="fill_parent"
40. android:layout_height="wrap_content"
41. android:max="100"
42. android:progress="10"/>
44. />
46. <TextView
47. android:id="@+id/time"
48. android:layout_width="fill_parent"
49. android:layout_height="wrap_content"
50. />
52. <TableLayout
53. android:layout_width="fill_parent"
54. android:layout_height="wrap_content"
55. android:stretchColumns="*" >
57. <TableRow >
59. <Button
60. android:id="@+id/playBtn"
61. android:layout_width="wrap_content"
62. android:layout_height="wrap_content"
63. android:text="@string/play_text" />
65. <Button
66. android:id="@+id/pauseBtn"
67. android:layout_width="wrap_content"
68. android:layout_height="wrap_content"
69. android:text="@string/pause_text" />
71. <Button
72. android:id="@+id/stopBtn"
73. android:layout_width="wrap_content"
74. android:layout_height="wrap_content"
75. android:text="@string/stop_text" />
76. </TableRow>
77. </TableLayout>
79. </LinearLayout>

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" > <TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="@string/music_name" /> <TableLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:stretchColumns="0" > <TableRow > <EditText android:id="@+id/musicEt" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="l.mp3" /> <Button android:id="@+id/chooseBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/choose_text" /> </TableRow> </TableLayout> <SeekBar android:id="@+id/seekBar" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <SeekBar android:id="@+id/seekBarSound" android:layout_width="fill_parent" android:layout_height="wrap_content" android:max="100" android:progress="10"/> /> <TextView android:id="@+id/time" android:layout_width="fill_parent" android:layout_height="wrap_content" /> <TableLayout android:layout_width="fill_parent" android:layout_height="wrap_content" android:stretchColumns="*" > <TableRow > <Button android:id="@+id/playBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/play_text" /> <Button android:id="@+id/pauseBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/pause_text" /> <Button android:id="@+id/stopBtn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/stop_text" /> </TableRow> </TableLayout> </LinearLayout>

MusicPlayerActivity.java

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1. package cn.csdn.playle;
3. import java.io.File;
4. import java.io.IOException;
6. import android.app.Activity;
7. import android.content.Context;
8. import android.content.Intent;
9. import android.media.AudioManager;
10. import android.media.MediaPlayer;
11. import android.os.Bundle;
12. import android.os.Environment;
13. import android.os.Handler;
14. import android.util.Log;
15. import android.view.View;
16. import android.view.View.OnClickListener;
17. import android.widget.Button;
18. import android.widget.EditText;
19. import android.widget.SeekBar;
20. import android.widget.SeekBar.OnSeekBarChangeListener;
21. import android.widget.TextView;
22. import android.widget.Toast;
24. public class MusicPlayerActivity extends Activity implements OnClickListener,
25. OnSeekBarChangeListener {
27. EditText musicEt;
28. Button playBtn, pauseBtn, stopBtn, chooseBtn;
29. TextView time;
30. AudioManager audiomanage;
31. int maxVolume, currentVolume;
32. SeekBar seekBar, seekBarSound;
33. MediaPlayer player = null;
35. File file = null;
37. int position = 0;
38. int i = 0;
39. Handler handler = new Handler();
42. public void onCreate(Bundle savedInstanceState) {
43. super.onCreate(savedInstanceState);
44. setContentView(R.layout.main);
46. player = new MediaPlayer();
48. findViews();
49. }
51. private void findViews() {
52. musicEt = (EditText) this.findViewById(R.id.musicEt);
53. playBtn = (Button) this.findViewById(R.id.playBtn);
54. pauseBtn = (Button) this.findViewById(R.id.pauseBtn);
55. stopBtn = (Button) this.findViewById(R.id.stopBtn);
56. chooseBtn = (Button) this.findViewById(R.id.chooseBtn);
57. seekBar = (SeekBar) this.findViewById(R.id.seekBar);
58. seekBarSound = (SeekBar) this.findViewById(R.id.seekBarSound);
59. time = (TextView) this.findViewById(R.id.time);
62. time.setOnClickListener(this);
63. playBtn.setOnClickListener(this);
64. pauseBtn.setOnClickListener(this);
65. stopBtn.setOnClickListener(this);
66. stopBtn.setEnabled(false);
67. pauseBtn.setEnabled(false);
69. seekBar.setOnSeekBarChangeListener(this);
71. chooseBtn.setOnClickListener(new OnClickListener() {
73. public void onClick(View v) {
75. Intent intent = new Intent(MusicPlayerActivity.this,
76. MusicListActivity.class);
77. startActivity(intent);
78. }
79. });
81. audiomanage = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
82. maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC); // 获取系统最大音量
83. seekBarSound.setMax(maxVolume); // 拖动条最高值与系统最大声匹配
84. currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); // 获取当前值
85. seekBarSound.setProgress(currentVolume);
87. seekBarSound.setOnSeekBarChangeListener(new OnSeekBarChangeListener() // 调音监听器
88. {
89. public void onProgressChanged(SeekBar arg0, int progress,
90. boolean fromUser) {
91. audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC,
92. progress, 0);
93. currentVolume = audiomanage
94. .getStreamVolume(AudioManager.STREAM_MUSIC); // 获取当前值
95. seekBarSound.setProgress(currentVolume);
97. }
99. public void onStartTrackingTouch(SeekBar seekBar) {
101. }
103. public void onStopTrackingTouch(SeekBar seekBar) {
105. }
106. });
108. Intent intent = this.getIntent();
109. String name = intent.getStringExtra("name");
110. musicEt.setText(name);
111. }
113. public void onClick(View v) {
115. String fileName = musicEt.getText().toString().trim();
117. // 获取sdcard的状态是否已加载 (MEDIA_MOUNTED 加载状态)
118. if (Environment.getExternalStorageState().equals(
119. Environment.MEDIA_MOUNTED)) {
120. file = new File(Environment.getExternalStorageDirectory(), fileName);
122. // 判断所播放的媒体文件是否存在
123. if (file.exists()) {
125. try {
126. switch (v.getId()) {// 返回一个int值
128. case R.id.playBtn:
129. playMusic(file);
131. break;
133. case R.id.pauseBtn:
134. if (player.isPlaying()) {
135. player.pause();
136. pauseBtn.setText(R.string.continue_text);
137. } else {
138. player.start();
139. pauseBtn.setText(R.string.pause_text);
140. }
141. break;
143. case R.id.stopBtn:
144. player.stop();
145. stopBtn.setEnabled(false);
146. seekBar.setProgress(0);
147. if (playBtn.getText().toString().equals("重置")) {
148. playBtn.setText(R.string.play_text);
149. }
150. if (pauseBtn.getText().toString().equals("继续")) {
151. pauseBtn.setText(R.string.pause_text);
152. pauseBtn.setEnabled(false);
153. } else {
154. pauseBtn.setEnabled(false);
155. }
157. break;
159. }
160. } catch (IllegalArgumentException e) {
161. Log.e("TAG", e.toString());
162. } catch (IllegalStateException e) {
163. Log.e("TAG", e.toString());
164. } catch (IOException e) {
165. Log.e("TAG", e.toString());
166. }
167. } else {
168. Toast.makeText(this, R.string.notfoundfile_text,
169. Toast.LENGTH_LONG).show();
170. }
171. }
173. else {
174. Toast.makeText(this, R.string.notfoundSdcard_text,
175. Toast.LENGTH_LONG).show();
176. }
177. }
179. protected void onDestroy() {
180. if (player != null) {
181. if (player.isPlaying()) {
182. player.stop();
183. }
184. player.release();
185. }
186. super.onDestroy();
187. }
189. protected void onPause() {
190. if (player != null) {
191. if (player.isPlaying()) {
192. player.pause();
193. }
194. }
195. super.onPause();
196. }
198. private void playMusic(File file) throws IllegalStateException, IOException {
200. if (musicEt.getText().toString() == null
201. || "".equals(musicEt.getText().toString())) {
202. Toast.makeText(this, "没有选中歌曲", Toast.LENGTH_LONG).show();
203. } else {
204. if (player != null) {
205. pauseBtn.setEnabled(true);
207. player.reset();
208. player.setDataSource(file.getAbsolutePath());
209. player.prepare();
210. player.start();
211. playBtn.setText(R.string.reset_text);
212. run();
213. }
214. if (playBtn.getText().toString().equals("重置")) {
215. pauseBtn.setEnabled(true);
216. stopBtn.setEnabled(true);
218. }
219. if (pauseBtn.getText().toString().equals("继续")) {
220. pauseBtn.setText(R.string.pause_text);
221. }
223. }
224. }
226. private void run() {
227. new Thread(new Runnable() {
228. public void run() {
229. while (player != null) {
230. int TIME = player.getDuration();
231. seekBar.setMax(TIME);// 获取歌曲的最大值
232. position = player.getCurrentPosition();// 返回当前播放进度值
233. seekBar.setProgress(position);
235. try {
236. Thread.sleep(3000);
237. } catch (InterruptedException e) {
238. e.printStackTrace();
239. }
241. }
242. }
244. }).start();
245. }
247. public void onProgressChanged(SeekBar seekBar, int progress,
248. boolean fromUser) {
250. }
252. public void onStartTrackingTouch(SeekBar seekBar) {
254. player.seekTo(seekBar.getProgress());
256. }
258. public void onStopTrackingTouch(SeekBar seekBar) {
260. player.seekTo(seekBar.getProgress());
261. }
263. }

package cn.csdn.playle; import java.io.File; import java.io.IOException; import android.app.Activity; import android.content.Context; import android.content.Intent; import android.media.AudioManager; import android.media.MediaPlayer; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.SeekBar; import android.widget.SeekBar.OnSeekBarChangeListener; import android.widget.TextView; import android.widget.Toast; public class MusicPlayerActivity extends Activity implements OnClickListener, OnSeekBarChangeListener { EditText musicEt; Button playBtn, pauseBtn, stopBtn, chooseBtn; TextView time; AudioManager audiomanage; int maxVolume, currentVolume; SeekBar seekBar, seekBarSound; MediaPlayer player = null; File file = null; int position = 0; int i = 0; Handler handler = new Handler(); public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); player = new MediaPlayer(); findViews(); } private void findViews() { musicEt = (EditText) this.findViewById(R.id.musicEt); playBtn = (Button) this.findViewById(R.id.playBtn); pauseBtn = (Button) this.findViewById(R.id.pauseBtn); stopBtn = (Button) this.findViewById(R.id.stopBtn); chooseBtn = (Button) this.findViewById(R.id.chooseBtn); seekBar = (SeekBar) this.findViewById(R.id.seekBar); seekBarSound = (SeekBar) this.findViewById(R.id.seekBarSound); time = (TextView) this.findViewById(R.id.time); time.setOnClickListener(this); playBtn.setOnClickListener(this); pauseBtn.setOnClickListener(this); stopBtn.setOnClickListener(this); stopBtn.setEnabled(false); pauseBtn.setEnabled(false); seekBar.setOnSeekBarChangeListener(this); chooseBtn.setOnClickListener(new OnClickListener() { public void onClick(View v) { Intent intent = new Intent(MusicPlayerActivity.this, MusicListActivity.class); startActivity(intent); } }); audiomanage = (AudioManager) getSystemService(Context.AUDIO_SERVICE); maxVolume = audiomanage.getStreamMaxVolume(AudioManager.STREAM_MUSIC); // 获取系统最大音量 seekBarSound.setMax(maxVolume); // 拖动条最高值与系统最大声匹配 currentVolume = audiomanage.getStreamVolume(AudioManager.STREAM_MUSIC); // 获取当前值 seekBarSound.setProgress(currentVolume); seekBarSound.setOnSeekBarChangeListener(new OnSeekBarChangeListener() // 调音监听器 { public void onProgressChanged(SeekBar arg0, int progress, boolean fromUser) { audiomanage.setStreamVolume(AudioManager.STREAM_MUSIC, progress, 0); currentVolume = audiomanage .getStreamVolume(AudioManager.STREAM_MUSIC); // 获取当前值 seekBarSound.setProgress(currentVolume); } public void onStartTrackingTouch(SeekBar seekBar) { } public void onStopTrackingTouch(SeekBar seekBar) { } }); Intent intent = this.getIntent(); String name = intent.getStringExtra("name"); musicEt.setText(name); } public void onClick(View v) { String fileName = musicEt.getText().toString().trim(); // 获取sdcard的状态是否已加载 (MEDIA_MOUNTED 加载状态) if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) { file = new File(Environment.getExternalStorageDirectory(), fileName); // 判断所播放的媒体文件是否存在 if (file.exists()) { try { switch (v.getId()) {// 返回一个int值 case R.id.playBtn: playMusic(file); break; case R.id.pauseBtn: if (player.isPlaying()) { player.pause(); pauseBtn.setText(R.string.continue_text); } else { player.start(); pauseBtn.setText(R.string.pause_text); } break; case R.id.stopBtn: player.stop(); stopBtn.setEnabled(false); seekBar.setProgress(0); if (playBtn.getText().toString().equals("重置")) { playBtn.setText(R.string.play_text); } if (pauseBtn.getText().toString().equals("继续")) { pauseBtn.setText(R.string.pause_text); pauseBtn.setEnabled(false); } else { pauseBtn.setEnabled(false); } break; } } catch (IllegalArgumentException e) { Log.e("TAG", e.toString()); } catch (IllegalStateException e) { Log.e("TAG", e.toString()); } catch (IOException e) { Log.e("TAG", e.toString()); } } else { Toast.makeText(this, R.string.notfoundfile_text, Toast.LENGTH_LONG).show(); } } else { Toast.makeText(this, R.string.notfoundSdcard_text, Toast.LENGTH_LONG).show(); } } protected void onDestroy() { if (player != null) { if (player.isPlaying()) { player.stop(); } player.release(); } super.onDestroy(); } protected void onPause() { if (player != null) { if (player.isPlaying()) { player.pause(); } } super.onPause(); } private void playMusic(File file) throws IllegalStateException, IOException { if (musicEt.getText().toString() == null || "".equals(musicEt.getText().toString())) { Toast.makeText(this, "没有选中歌曲", Toast.LENGTH_LONG).show(); } else { if (player != null) { pauseBtn.setEnabled(true); player.reset(); player.setDataSource(file.getAbsolutePath()); player.prepare(); player.start(); playBtn.setText(R.string.reset_text); run(); } if (playBtn.getText().toString().equals("重置")) { pauseBtn.setEnabled(true); stopBtn.setEnabled(true); } if (pauseBtn.getText().toString().equals("继续")) { pauseBtn.setText(R.string.pause_text); } } } private void run() { new Thread(new Runnable() { public void run() { while (player != null) { int TIME = player.getDuration(); seekBar.setMax(TIME);// 获取歌曲的最大值 position = player.getCurrentPosition();// 返回当前播放进度值 seekBar.setProgress(position); try { Thread.sleep(3000); } catch (InterruptedException e) { e.printStackTrace(); } } } }).start(); } public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) { } public void onStartTrackingTouch(SeekBar seekBar) { player.seekTo(seekBar.getProgress()); } public void onStopTrackingTouch(SeekBar seekBar) { player.seekTo(seekBar.getProgress()); } }

效果图：