一個簡單的Android音樂播放器

實現功能，播放，暫停，重置，進度條的使用

String文件

1. <?xml version="1.0" encoding="utf-8"?>
2. <resources>
4. <string name="app_name">MusicPlayer</string>
5. <string name="music_name">歌曲：</string>
6. <string name="play_text">播放</string>
7. <string name="pause_text">暫停</string>
8. <string name="continue_text">繼續</string>
9. <string name="reset_text">重置</string>
10. <string name="stop_text">關閉</string>
11. <string name="notfoundfile_text">媒體文件不存在</string>
12. <string name="notfoundSdcard_text">SDCard不存在</string>
14. </resources>

布局：

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. <EditText
13. android:id="@+id/musicEt"
14. android:layout_width="fill_parent"
15. android:layout_height="wrap_content"
16. android:text="a.mp3"
17. />
18. <SeekBar
19. android:id="@+id/seekBar"
20. android:layout_width="match_parent"
21. android:layout_height="wrap_content"
22. android:max="10000"
23. />
24. <TableLayout
25. android:layout_width="fill_parent"
26. android:layout_height="wrap_content"
27. android:stretchColumns="*" >
29. <TableRow >
31. <Button
32. android:id="@+id/playBtn"
33. android:layout_width="wrap_content"
34. android:layout_height="wrap_content"
35. android:text="@string/play_text" />
37. <Button
38. android:id="@+id/pauseBtn"
39. android:layout_width="wrap_content"
40. android:layout_height="wrap_content"
41. android:text="@string/pause_text" />
43. <Button
44. android:id="@+id/resetBtn"
45. android:layout_width="wrap_content"
46. android:layout_height="wrap_content"
47. android:text="@string/reset_text" />
49. <Button
50. android:id="@+id/stopBtn"
51. android:layout_width="wrap_content"
52. android:layout_height="wrap_content"
53. android:text="@string/stop_text" />
54. </TableRow>
55. </TableLayout>
56. </LinearLayout>

Java源碼：

1. package cn.class3g.musicplayer;
3. import java.io.File;
4. import java.io.IOException;
6. import android.app.Activity;
8. import android.media.MediaPlayer;
9. import android.os.Bundle;
10. import android.os.Environment;
11. import android.os.Handler;
12. import android.util.Log;
13. import android.view.View;
14. import android.view.View.OnClickListener;
15. import android.widget.Button;
16. import android.widget.EditText;
17. import android.widget.SeekBar;
18. import android.widget.SeekBar.OnSeekBarChangeListener;
19. import android.widget.Toast;
21. public class MusicPlayerActivity extends Activity implements OnClickListener,
22. OnSeekBarChangeListener {
24. private static final String TAG = "MusicPlayerActivity";
25. EditText musicEt;
26. Button playBtn, pauseBtn, resetBtn, stopBtn;
27. Handler handler = null;
28. Handler fHandler = null;
29. MediaPlayer player = null;
31. SeekBar seekbar = null;
33. public void onCreate(Bundle savedInstanceState) {
34. super.onCreate(savedInstanceState);
35. setContentView(R.layout.main);
37. player = new MediaPlayer();
39. findViews();
41. }
43. private void findViews() {
44. musicEt = (EditText) this.findViewById(R.id.musicEt);
45. playBtn = (Button) this.findViewById(R.id.playBtn);
46. pauseBtn = (Button) this.findViewById(R.id.pauseBtn);
47. resetBtn = (Button) this.findViewById(R.id.resetBtn);
48. stopBtn = (Button) this.findViewById(R.id.stopBtn);
49. seekbar = (SeekBar) this.findViewById(R.id.seekBar);
50. playBtn.setOnClickListener(this);
51. pauseBtn.setOnClickListener(this);
52. resetBtn.setOnClickListener(this);
53. stopBtn.setOnClickListener(this);
54. seekbar.setOnSeekBarChangeListener(this);
55. }
57. public void onClick(View v) {
58. String fileName = musicEt.getText().toString();
60. // 確定sdcard狀態是否為已加載
61. if (Environment.getExternalStorageState().equals(
62. Environment.MEDIA_MOUNTED)) {
63. File file = new File(Environment.getExternalStorageDirectory(),
64. fileName);
66. // 判斷所播放的媒體文件是否存在
67. if (file.exists()) {
69. try {
70. switch (v.getId()) {
71. case R.id.playBtn:
72. playMusic(file);
73. break;
74. case R.id.pauseBtn:
75. if (player.isPlaying()) {
76. player.pause();
77. pauseBtn.setText(R.string.continue_text);
78. } else {
79. player.start();
80. pauseBtn.setText(R.string.pause_text);
81. }
82. break;
83. case R.id.resetBtn:
84. if (player.isPlaying()) {
85. player.seekTo(0);
86. } else {
87. playMusic(file);
88. }
89. break;
90. case R.id.stopBtn:
91. if (player.isPlaying()) {
92. player.stop();
93. }
94. break;
95. }
96. } catch (Exception e) {
97. Log.e(TAG, e.toString());
98. }
99. } else {
100. Toast.makeText(this, R.string.notfoundfile_text,
101. Toast.LENGTH_SHORT).show();
102. }
103. } else {
104. Toast.makeText(this, R.string.notfoundSdcard_text,
105. Toast.LENGTH_SHORT).show();
106. }
107. }
109. protected void onDestroy() {
110. if (player != null) {
111. if (player.isPlaying()) {
112. player.stop();
113. }
114. player.release();
115. }
116. super.onDestroy();
117. }
119. protected void onPause() {
120. if (player != null) {
121. if (player.isPlaying()) {
122. player.pause();
123. }
124. }
125. super.onPause();
126. }
128. protected void onResume() {
129. if (player != null) {
130. if (!player.isPlaying()) {
131. player.start();
132. }
133. }
134. super.onResume();
135. }
137. private void playMusic(File file) throws IllegalArgumentException,
138. IllegalStateException, IOException {
139. if (player != null) {
140. player.reset();
141. player.setDataSource(file.getAbsolutePath());
142. player.prepare();
143. player.start();
145. seekbar.setMax(player.getDuration());
146. Log.i(TAG, String.valueOf(player.getDuration()));
148. new Thread(new seekBar()).start();
149. }
150. }
152. class seekBar implements Runnable {
154. int position = 0;
156. public void run() {
157. while (player != null) {
158. position = player.getCurrentPosition();
159. seekbar.setProgress(position);
161. try {
162. Thread.sleep(100);
163. } catch (InterruptedException e) {
164. Log.e(TAG, e.toString());
165. }
166. }
168. }
170. }
172. public void onProgressChanged(SeekBar seekBar, int progress,
173. boolean fromUser) {
174. if (fromUser)
175. player.seekTo(progress);
176. }
178. public void onStartTrackingTouch(SeekBar seekBar) {
180. }
182. public void onStopTrackingTouch(SeekBar seekBar) {
184. }
185. }