Android音樂播放MediaPlayer

Android音樂播放MediaPlayer代碼，很簡單的例子程序，根據拖動，可是實現歌曲的不同位置的播放。

1. package mars.com;
3. import android.app.Activity;
4. import android.media.MediaPlayer;
5. import android.media.MediaPlayer.OnCompletionListener;
6. import android.os.AsyncTask;
7. import android.os.Bundle;
8. import android.view.View;
9. import android.view.View.OnClickListener;
10. import android.widget.Button;
11. import android.widget.SeekBar;
12. import android.widget.SeekBar.OnSeekBarChangeListener;
13. import android.widget.TextView;
15. public class DemoMP3Activity extends Activity {
16. private Button play;
17. private Button pause;
18. private Button stop;
19. private TextView info;
20. private SeekBar seekBar;
21. private MediaPlayer mediaPlayer;
22. private boolean isPlay = true;// 播放標記
23. private boolean isPause = false;// 暫停標記
25. @Override
26. public void onCreate(Bundle savedInstanceState) {
27. super.onCreate(savedInstanceState);
28. setContentView(R.layout.main);
29. info = (TextView) findViewById(R.id.textView1);
30. play = (Button) findViewById(R.id.button1);
31. pause = (Button) findViewById(R.id.button2);
32. stop = (Button) findViewById(R.id.button3);
33. seekBar = (SeekBar) findViewById(R.id.seekBar1);
35. this.play.setOnClickListener(new OnClickListener() {
36. public void onClick(View v) {
37. mediaPlayer = MediaPlayer.create(getApplicationContext(),
38. R.raw.bird);
39. if (mediaPlayer != null) {
40. mediaPlayer.stop();
41. }
42. seekBar.setMax(mediaPlayer.getDuration());// 設置拖拽條的長度
43. UpdateThread update = new UpdateThread();
44. update.execute(1000);// 每一秒就更新一次進度條
45. DemoMP3Activity.this.mediaPlayer
46. .setOnCompletionListener(new OnCompletionListener() {
47. public void onCompletion(MediaPlayer mp) {
48. // 如果播放完了
49. isPlay = false;
50. mediaPlayer.release();// 釋放資源
51. }
52. });
53. try {
54. mediaPlayer.prepare();
55. mediaPlayer.start();
56. info.setText("正在播放");
57. } catch (Exception e) {
58. info.setText(e.toString());
59. }
60. }
61. });
63. this.pause.setOnClickListener(new OnClickListener() {
64. public void onClick(View v) {
65. if (mediaPlayer != null) {
66. if (isPause == false) {
67. mediaPlayer.pause();
68. isPause = true;
69. info.setText("暫停播放");
70. } else {
71. mediaPlayer.start();
72. isPause = false;
73. info.setText("繼續播放");
74. }
75. }
76. }
77. });
79. this.stop.setOnClickListener(new OnClickListener() {
80. public void onClick(View v) {
81. if (mediaPlayer != null) {
82. mediaPlayer.stop();
83. info.setText("停止播放");
84. }
85. }
86. });
88. this.seekBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
89. public void onStopTrackingTouch(SeekBar seekBar) {
90. mediaPlayer.seekTo(seekBar.getProgress());
91. }
93. public void onStartTrackingTouch(SeekBar seekBar) {
95. }
97. public void onProgressChanged(SeekBar seekBar, int progress,
98. boolean fromUser) {
100. }
101. });
102. }
104. private class UpdateThread extends AsyncTask<Integer, Integer, String> {
105. @Override
106. protected void onPostExecute(String result) {
107. super.onPostExecute(result);
108. }
110. @Override
111. protected void onProgressUpdate(Integer... values) {
112. seekBar.setProgress(values[0]);// 更新
113. }
115. @Override
116. protected String doInBackground(Integer... params) {
117. while (isPlay) {
118. try {
119. Thread.sleep(params[0]);
120. } catch (InterruptedException e) {
121. e.printStackTrace();
122. }
123. this.publishProgress(mediaPlayer.getCurrentPosition());// 將media的當前進度傳遞過去
124. }
126. return null;
127. }
129. }
130. }