[Android智慧型手機設計_Ch9_2_MediaPlayer_Audio播放器]

woff

Audio檔案可以來自外部檔案（例如：SD卡）或是網路，步驟如下：

使用MediaPlayer類別的建構式來建立MediaPlayer的物件實體

呼叫setDataSource()並搭配路徑來指定欲播放的檔案

先呼叫prepare()，然後呼叫start()開始播放

如果呼叫stop()停止播放後還想繼續播放，必須呼叫reset()與prepare()，方可再呼叫start()開始播放

1.設計Ch9_2_MediaPlayer_Audio.java

1. package com.example.ch9_2_mediaplayer_audio;
   
2. 
   
3. import java.io.IOException;
   
4. 
   
5. import android.media.AudioManager;
   
6. import android.media.MediaPlayer;
   
7. import android.os.Bundle;
   
8. import android.app.Activity;
   
9. import android.view.Menu;
   
10. import android.view.View;
    
11. import android.view.View.OnClickListener;
    
12. import android.widget.Button;
    
13. import android.widget.TextView;
    
14. import android.widget.Toast;
    
15. 
    
16. public class Ch9_2_MediaPlayer_Audio extends Activity {
    
17. Button btn1,btn2,btn3;
    
18. TextView tv1;
    
19. MediaPlayer mp;
    
20. @Override
    
21. protected void onCreate(Bundle savedInstanceState) {
    
22. super.onCreate(savedInstanceState);
    
23. setContentView(R.layout.main);
    
24. btn1=(Button)findViewById(R.id.button1);
    
25. btn2=(Button)findViewById(R.id.button2);
    
26. btn3=(Button)findViewById(R.id.button3);
    
27. tv1=(TextView)findViewById(R.id.tv1);
    
28. btn1.setOnClickListener(new OnClickListener(){
    
29. public void onClick(View v) {
    
30. playAudio("/mnt/sdcard/lee.mp3");
    
31. Toast.makeText(getApplicationContext(), "播放SDCARD_Audio", Toast.LENGTH_LONG).show();
    
32. }});
    
33. btn2.setOnClickListener(new OnClickListener(){
    
34. public void onClick(View v) {
    
35. playAudio("http://192.168.255.184/lee.mp3");
    
36. Toast.makeText(getApplicationContext(), "播放Netork_Audio", Toast.LENGTH_LONG).show();
    
37. }});
    
38. btn3.setOnClickListener(new OnClickListener(){
    
39. public void onClick(View v) {
    
40. if(mp !=null)
    
41. mp.stop();
    
42. Toast.makeText(getApplicationContext(), "停止播放", Toast.LENGTH_LONG).show();
    
43. }});
    
44. }
    
45. public void playAudio(String path){
    
46. tv1.setText("檔案來源----"+path);
    
47. if(mp ==null)
    
48. mp=new MediaPlayer();
    
49. mp.reset();
    
50. try {
    
51. mp.setDataSource(path);
    
52. mp.setAudioStreamType(AudioManager.STREAM_MUSIC);
    
53. mp.prepare();
    
54. mp.start();
    
55. } catch (Exception e) {
    
56. e.printStackTrace();
    
57. }
    
58. }
    
59. @Override
    
60. protected void onPause() {
    
61. super.onPause();
    
62. if(mp!=null){
    
63. mp.release();
    
64. mp=null;
    
65. }
    
66. }
    
67. }

複製代碼