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Android 一个实例网络视频

2013年08月24日 ⁄ 综合 ⁄ 共 7547字 ⁄ 字号 小 中 大 ⁄ 评论关闭

 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：

效果图：

main.xml的源码如下：

java代码：

  1. <?xml version="1.0" encoding="utf-8"?>
  4. <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
  5. android:layout_height="fill_parent"
  6. android:layout_width="fill_parent">
  9. <SurfaceView
  10. android:id="@+id/surfaceView1"
  11. android:layout_height="fill_parent"
  12. android:layout_width="fill_parent">
  13. </SurfaceView>
  16. <LinearLayout
  17. android:layout_height="wrap_content"
  18. android:layout_width="fill_parent"
  19. android:layout_gravity="bottom"
  20. android:orientation="vertical">
  23. <LinearLayout
  24. android:orientation="horizontal"
  25. android:layout_gravity="center_horizontal"
  26. android:layout_marginTop="4.0dip"
  27. android:layout_height="wrap_content"
  28. android:layout_width="wrap_content">
  31. <Button
  32. android:layout_width="wrap_content"
  33. android:layout_height="wrap_content"
  34. android:id="@+id/btnPlayUrl"
  35. android:text="播放网络视频">
  36. </Button>
  39. <Button android:layout_height="wrap_content"
  40. android:id="@+id/btnPause"
  41. android:text="暂停"
  42. android:layout_width="80dip">
  43. </Button>
  46. <Button
  47. android:layout_height="wrap_content"
  48. android:layout_width="80dip"
  49. android:text="停止"
  50. android:id="@+id/btnStop"></Button>
  51. </LinearLayout>
  54. <LinearLayout android:orientation="horizontal"
  55. android:layout_width="fill_parent"
  56. android:layout_height="wrap_content"
  57. android:layout_marginBottom="20dip">
  58. <SeekBar
  59. android:paddingRight="10dip"
  60. android:layout_gravity="center_vertical"
  61. android:paddingLeft="10dip"
  62. android:layout_weight="1.0"
  63. android:layout_height="wrap_content"
  64. android:layout_width="wrap_content"
  65. android:id="@+id/skbProgress"
  66. android:max="100"></SeekBar>
  67. </LinearLayout>
  68. </LinearLayout>
  69. </FrameLayout>

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       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：

java代码：

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

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       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：

java代码：

  1. package eoe.demo;
  3. import java.io.IOException;
  4. import java.util.Timer;
  5. import java.util.TimerTask;
  6. import android.media.AudioManager;
  7. import android.media.MediaPlayer;
  8. import android.media.MediaPlayer.OnBufferingUpdateListener;
  9. import android.media.MediaPlayer.OnCompletionListener;
  10. import android.os.Handler;
  11. import android.os.Message;
  12. import android.util.Log;
  13. import android.view.SurfaceHolder;
  14. import android.view.SurfaceView;
  15. import android.widget.SeekBar;
  17. public class Player implements OnBufferingUpdateListener,
  18. OnCompletionListener, MediaPlayer.OnPreparedListener,
  19. SurfaceHolder.Callback {
  20. private int videoWidth;
  21. private int videoHeight;
  22. public MediaPlayer mediaPlayer;
  23. private SurfaceHolder surfaceHolder;
  24. private SeekBar skbProgress;
  25. private Timer mTimer=new Timer();
  26. public Player(SurfaceView surfaceView,SeekBar skbProgress) {
  27. this.skbProgress=skbProgress;
  28. surfaceHolder=surfaceView.getHolder();
  29. surfaceHolder.addCallback(this);
  30. surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
  31. mTimer.schedule(mTimerTask, 0, 1000);
  32. }
  34. /*通过定时器和Handler来更新进度条 */
  35. TimerTask mTimerTask = new TimerTask() {
  36. @Override
  37. public void run() {
  38. if(mediaPlayer==null)
  39. return;
  40. if (mediaPlayer.isPlaying() && skbProgress.isPressed() == false) {
  41. handleProgress.sendEmptyMessage(0);
  42. }
  43. }
  44. };
  46. Handler handleProgress = new Handler() {
  47. public void handleMessage(Message msg) {
  49. int position = mediaPlayer.getCurrentPosition();
  50. int duration = mediaPlayer.getDuration();
  52. if (duration > 0) {
  53. long pos = skbProgress.getMax() * position / duration;
  54. skbProgress.setProgress((int) pos);
  55. }
  56. };
  57. };
  59. public void play() {
  60. mediaPlayer.start();
  61. }
  63. public void playUrl(String videoUrl) {
  64. try {
  65. mediaPlayer.reset();
  66. mediaPlayer.setDataSource(videoUrl);
  67. mediaPlayer.prepare();//prepare之后自动播放
  68. //mediaPlayer.start();
  69. } catch (IllegalArgumentException e) {
  70. // TODO Auto-generated catch block
  71. e.printStackTrace();
  72. } catch (IllegalStateException e) {
  73. // TODO Auto-generated catch block
  74. e.printStackTrace();
  75. } catch (IOException e) {
  76. // TODO Auto-generated catch block
  77. e.printStackTrace();
  78. }
  79. }
  81. public void pause() {
  82. mediaPlayer.pause();
  83. }
  85. public void stop() {
  86. if (mediaPlayer != null) {
  87. mediaPlayer.stop();
  88. mediaPlayer.release();
  89. mediaPlayer = null;
  90. }
  91. }
  93. @Override
  94. public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
  95. Log.e("mediaPlayer", "surface changed");
  96. }
  98. @Override
  99. public void surfaceCreated(SurfaceHolder arg0) {
  100. try {
  101. mediaPlayer = new MediaPlayer();
  102. mediaPlayer.setDisplay(surfaceHolder);
  103. mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
  104. mediaPlayer.setOnBufferingUpdateListener(this);
  105. mediaPlayer.setOnPreparedListener(this);
  106. } catch (Exception e) {
  107. Log.e("mediaPlayer", "error", e);
  108. }
  109. Log.e("mediaPlayer", "surface created");
  110. }
  112. @Override
  113. public void surfaceDestroyed(SurfaceHolder arg0) {
  114. Log.e("mediaPlayer", "surface destroyed");
  115. }
  118. @Override
  119. /**
  120. * 通过onPrepared播放
  121. */
  122. public void onPrepared(MediaPlayer arg0) {
  123. videoWidth = mediaPlayer.getVideoWidth();
  124. videoHeight = mediaPlayer.getVideoHeight();
  125. if (videoHeight != 0 && videoWidth != 0) {
  126. arg0.start();
  127. }
  128. Log.e("mediaPlayer", "onPrepared");
  129. }
  131. @Override
  132. public void onCompletion(MediaPlayer arg0) {
  133. // TODO Auto-generated method stub
  135. }
  137. @Override
  138. public void onBufferingUpdate(MediaPlayer arg0, int bufferingProgress) {
  139. skbProgress.setSecondaryProgress(bufferingProgress);
  140. int currentProgress=skbProgress.getMax()*mediaPlayer.getCurrentPosition()/mediaPlayer.getDuration();
  141. Log.e(currentProgress+"% play", bufferingProgress + "% buffer");
  143. }
  145. }

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       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：

java代码：

  1. package eoe.demo;
  3. import android.app.Activity;
  4. import android.content.pm.ActivityInfo;
  5. import android.net.Uri;
  6. import android.os.Bundle;
  7. import android.util.Log;
  8. import android.view.SurfaceView;
  9. import android.view.View;
  10. import android.view.View.OnClickListener;
  11. import android.widget.Button;
  12. import android.widget.SeekBar;
  14. public class test_videoplayer extends Activity {
  15. private SurfaceView surfaceView;
  16. private Button btnPause, btnPlayUrl, btnStop;
  17. private SeekBar skbProgress;
  18. private Player player;
  20. /** Called when the activity is first created. */
  21. @Override
  22. public void onCreate(Bundle savedInstanceState) {
  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(new ClickEvent());
  31. btnPause = (Button) this.findViewById(R.id.btnPause);
  32. btnPause.setOnClickListener(new ClickEvent());
  34. btnStop = (Button) this.findViewById(R.id.btnStop);
  35. btnStop.setOnClickListener(new ClickEvent());
  37. skbProgress = (SeekBar) this.findViewById(R.id.skbProgress);
  38. skbProgress.setOnSeekBarChangeListener(new SeekBarChangeEvent());
  39. player = new Player(surfaceView, skbProgress);
  41. }
  43. class ClickEvent implements OnClickListener {
  45. @Override
  46. public void onClick(View arg0) {
  47. if (arg0 == btnPause) {
  48. player.pause();
  49. } else if (arg0 == btnPlayUrl) {
  50. String url="http://daily3gp.com/vids/family_guy_penis_car.3gp";
  51. player.playUrl(url);
  52. } else if (arg0 == btnStop) {
  53. player.stop();
  54. }
  56. }
  57. }
  59. class SeekBarChangeEvent implements SeekBar.OnSeekBarChangeListener {
  60. int progress;
  62. @Override
  63. public void onProgressChanged(SeekBar seekBar, int progress,
  64. boolean fromUser) {
  65. // 原本是(progress/seekBar.getMax())*player.mediaPlayer.getDuration()
  66. this.progress = progress * player.mediaPlayer.getDuration()
  67. / seekBar.getMax();
  68. }
  70. @Override
  71. public void onStartTrackingTouch(SeekBar seekBar) {
  73. }
  75. @Override
  76. public void onStopTrackingTouch(SeekBar seekBar) {
  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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