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Android提高第二十一篇之MediaPlayer播放网络视频

分类: 文章 • 2024-01-24 09:35:16

本文来自http://blog.****.net/hellogv/，引用必须注明出处！

上次讲解了MediaPlayer播放网络音频，介绍了MediaPlayer关于网络音频的缓冲和进度条控制的方法，这次再讲解MediaPlayer播放网络视频。播放网络视频比播放网络音频多需要一个SurfaceView而已，已经熟悉MediaPlayer播放网络音频之后，相信大家对播放网络视频也能很快地掌握。先来看看本文程序运行截图：

Android提高第二十一篇之MediaPlayer播放网络视频

本文程序的视频来自http://daily3gp.com，大家可以替换程序中的视频链接，试试其他影片。

main.xml的源码如下：

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  1. <?xmlversion="1.0"encoding="utf-8"?>
  2. <FrameLayoutxmlns:android="http://schemas.android.com/apk/res/android"
  3. android:layout_height="fill_parent"android:layout_width="fill_parent">
  4. <SurfaceViewandroid:id="@+id/surfaceView1"
  5. android:layout_height="fill_parent"android:layout_width="fill_parent"></SurfaceView>
  6. <LinearLayoutandroid:layout_height="wrap_content"
  7. android:layout_width="fill_parent"android:layout_gravity="bottom"
  8. android:orientation="vertical">
  9. <LinearLayoutandroid:orientation="horizontal"
  10. android:layout_gravity="center_horizontal"android:layout_marginTop="4.0dip"
  11. android:layout_height="wrap_content"android:layout_width="wrap_content">
  12. <Buttonandroid:layout_width="wrap_content"
  13. android:layout_height="wrap_content"android:id="@+id/btnPlayUrl"
  14. android:text="播放网络视频"></Button>
  15. <Buttonandroid:layout_height="wrap_content"android:id="@+id/btnPause"
  16. android:text="暂停"android:layout_width="80dip"></Button>
  17. <Buttonandroid:layout_height="wrap_content"
  18. android:layout_width="80dip"android:text="停止"android:id="@+id/btnStop"></Button>
  19. </LinearLayout>
  20. <LinearLayoutandroid:orientation="horizontal"
  21. android:layout_width="fill_parent"android:layout_height="wrap_content"
  22. android:layout_marginBottom="20dip">
  23. <SeekBarandroid:paddingRight="10dip"android:layout_gravity="center_vertical"
  24. android:paddingLeft="10dip"android:layout_weight="1.0"
  25. android:layout_height="wrap_content"android:layout_width="wrap_content"
  26. android:id="@+id/skbProgress"android:max="100"></SeekBar>
  27. </LinearLayout>
  28. </LinearLayout>
  29. </FrameLayout>

Player.java是本文的核心，Player.java实现了“进度条更新”、“数据缓冲”、“SurfaceHolder生命周期”等功能，其中“SurfaceHolder生命周期”是视频与音频播放的最大区别，通过surfaceCreated()、surfaceDestroyed()、surfaceChanged()可以创建/释放某些资源。下面这个地方需要注意一下：

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  1. videoWidth=mediaPlayer.getVideoWidth();
  2. videoHeight=mediaPlayer.getVideoHeight();
  3. if(videoHeight!=0&&videoWidth!=0){
  4. arg0.start();
  5. }

有些视频是android播放器不能播放的，不能播放时videoHeight=0，videoWidth=0，以此来判断是否播放视频。

Player.java源码如下：

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  1. packagecom.videoplayer;
  4. importjava.io.IOException;
  5. importjava.util.Timer;
  6. importjava.util.TimerTask;
  7. importandroid.media.AudioManager;
  8. importandroid.media.MediaPlayer;
  9. importandroid.media.MediaPlayer.OnBufferingUpdateListener;
  10. importandroid.media.MediaPlayer.OnCompletionListener;
  11. importandroid.os.Handler;
  12. importandroid.os.Message;
  13. importandroid.util.Log;
  14. importandroid.view.SurfaceHolder;
  15. importandroid.view.SurfaceView;
  16. importandroid.widget.SeekBar;
  18. publicclassPlayerimplementsOnBufferingUpdateListener,
  19. OnCompletionListener,MediaPlayer.OnPreparedListener,
  20. SurfaceHolder.Callback{
  21. privateintvideoWidth;
  22. privateintvideoHeight;
  23. publicMediaPlayermediaPlayer;
  24. privateSurfaceHoldersurfaceHolder;
  25. privateSeekBarskbProgress;
  26. privateTimermTimer=newTimer();
  27. publicPlayer(SurfaceViewsurfaceView,SeekBarskbProgress)
  28. {
  29. this.skbProgress=skbProgress;
  30. surfaceHolder=surfaceView.getHolder();
  31. surfaceHolder.addCallback(this);
  32. surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  33. mTimer.schedule(mTimerTask,0,1000);
  34. }
  36. /*******************************************************
  37. *通过定时器和Handler来更新进度条
  38. ******************************************************/
  39. TimerTaskmTimerTask=newTimerTask(){
  40. @Override
  41. publicvoidrun(){
  42. if(mediaPlayer==null)
  43. return;
  44. if(mediaPlayer.isPlaying()&&skbProgress.isPressed()==false){
  45. handleProgress.sendEmptyMessage(0);
  46. }
  47. }
  48. };
  50. HandlerhandleProgress=newHandler(){
  51. publicvoidhandleMessage(Messagemsg){
  53. intposition=mediaPlayer.getCurrentPosition();
  54. intduration=mediaPlayer.getDuration();
  56. if(duration>0){
  57. longpos=skbProgress.getMax()*position/duration;
  58. skbProgress.setProgress((int)pos);
  59. }
  60. };
  61. };
  62. //*****************************************************
  64. publicvoidplay()
  65. {
  66. mediaPlayer.start();
  67. }
  69. publicvoidplayUrl(StringvideoUrl)
  70. {
  71. try{
  72. mediaPlayer.reset();
  73. mediaPlayer.setDataSource(videoUrl);
  74. mediaPlayer.prepare();//prepare之后自动播放
  75. //mediaPlayer.start();
  76. }catch(IllegalArgumentExceptione){
  77. //TODOAuto-generatedcatchblock
  78. e.printStackTrace();
  79. }catch(IllegalStateExceptione){
  80. //TODOAuto-generatedcatchblock
  81. e.printStackTrace();
  82. }catch(IOExceptione){
  83. //TODOAuto-generatedcatchblock
  84. e.printStackTrace();
  85. }
  86. }
  89. publicvoidpause()
  90. {
  91. mediaPlayer.pause();
  92. }
  94. publicvoidstop()
  95. {
  96. if(mediaPlayer!=null){
  97. mediaPlayer.stop();
  98. mediaPlayer.release();
  99. mediaPlayer=null;
  100. }
  101. }
  103. @Override
  104. publicvoidsurfaceChanged(SurfaceHolderarg0,intarg1,intarg2,intarg3){
  105. Log.e("mediaPlayer","surfacechanged");
  106. }
  108. @Override
  109. publicvoidsurfaceCreated(SurfaceHolderarg0){
  110. try{
  111. mediaPlayer=newMediaPlayer();
  112. mediaPlayer.setDisplay(surfaceHolder);
  113. mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  114. mediaPlayer.setOnBufferingUpdateListener(this);
  115. mediaPlayer.setOnPreparedListener(this);
  116. }catch(Exceptione){
  117. Log.e("mediaPlayer","error",e);
  118. }
  119. Log.e("mediaPlayer","surfacecreated");
  120. }
  122. @Override
  123. publicvoidsurfaceDestroyed(SurfaceHolderarg0){
  124. Log.e("mediaPlayer","surfacedestroyed");
  125. }
  128. @Override
  129. /**
  130. *通过onPrepared播放
  131. */
  132. publicvoidonPrepared(MediaPlayerarg0){
  133. videoWidth=mediaPlayer.getVideoWidth();
  134. videoHeight=mediaPlayer.getVideoHeight();
  135. if(videoHeight!=0&&videoWidth!=0){
  136. arg0.start();
  137. }
  138. Log.e("mediaPlayer","onPrepared");
  139. }
  141. @Override
  142. publicvoidonCompletion(MediaPlayerarg0){
  143. //TODOAuto-generatedmethodstub
  145. }
  147. @Override
  148. publicvoidonBufferingUpdate(MediaPlayerarg0,intbufferingProgress){
  149. skbProgress.setSecondaryProgress(bufferingProgress);
  150. intcurrentProgress=skbProgress.getMax()*mediaPlayer.getCurrentPosition()/mediaPlayer.getDuration();
  151. Log.e(currentProgress+"%play",bufferingProgress+"%buffer");
  153. }
  155. }

test_videoplayer.java是主程序，负责调用Player类，其中关键部分是SeekBarChangeEvent这个SeekBar拖动的事件：SeekBar的Progress是0~SeekBar.getMax()之内的数，而MediaPlayer.seekTo()的参数是0~MediaPlayer.getDuration()之内数，所以MediaPlayer.seekTo()的参数是(progress/seekBar.getMax())*MediaPlayer.getDuration()。

test_videoplayer.java源码如下：

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  1. packagecom.videoplayer;
  3. importandroid.app.Activity;
  4. importandroid.content.pm.ActivityInfo;
  5. importandroid.net.Uri;
  6. importandroid.os.Bundle;
  7. importandroid.util.Log;
  8. importandroid.view.SurfaceView;
  9. importandroid.view.View;
  10. importandroid.view.View.OnClickListener;
  11. importandroid.widget.Button;
  12. importandroid.widget.SeekBar;
  14. publicclasstest_videoplayerextendsActivity{
  15. privateSurfaceViewsurfaceView;
  16. privateButtonbtnPause,btnPlayUrl,btnStop;
  17. privateSeekBarskbProgress;
  18. privatePlayerplayer;
  20. /**Calledwhentheactivityisfirstcreated.*/
  21. @Override
  22. publicvoidonCreate(BundlesavedInstanceState){
  23. super.onCreate(savedInstanceState);
  24. setContentView(R.layout.main);
  25. setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
  26. surfaceView=(SurfaceView)this.findViewById(R.id.surfaceView1);
  28. btnPlayUrl=(Button)this.findViewById(R.id.btnPlayUrl);
  29. btnPlayUrl.setOnClickListener(newClickEvent());
  31. btnPause=(Button)this.findViewById(R.id.btnPause);
  32. btnPause.setOnClickListener(newClickEvent());
  34. btnStop=(Button)this.findViewById(R.id.btnStop);
  35. btnStop.setOnClickListener(newClickEvent());
  37. skbProgress=(SeekBar)this.findViewById(R.id.skbProgress);
  38. skbProgress.setOnSeekBarChangeListener(newSeekBarChangeEvent());
  39. player=newPlayer(surfaceView,skbProgress);
  41. }
  43. classClickEventimplementsOnClickListener{
  45. @Override
  46. publicvoidonClick(Viewarg0){
  47. if(arg0==btnPause){
  48. player.pause();
  49. }elseif(arg0==btnPlayUrl){
  50. Stringurl="http://daily3gp.com/vids/family_guy_penis_car.3gp";
  51. player.playUrl(url);
  52. }elseif(arg0==btnStop){
  53. player.stop();
  54. }
  56. }
  57. }
  59. classSeekBarChangeEventimplementsSeekBar.OnSeekBarChangeListener{
  60. intprogress;
  62. @Override
  63. publicvoidonProgressChanged(SeekBarseekBar,intprogress,
  64. booleanfromUser){
  65. //原本是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()
  66. this.progress=progress*player.mediaPlayer.getDuration()
  67. /seekBar.getMax();
  68. }
  70. @Override
  71. publicvoidonStartTrackingTouch(SeekBarseekBar){
  73. }
  75. @Override
  76. publicvoidonStopTrackingTouch(SeekBarseekBar){
  77. //seekTo()的参数是相对与影片时间的数字，而不是与seekBar.getMax()相对的数字
  78. player.mediaPlayer.seekTo(progress);
  79. }
  80. }
  82. }

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