Android编程视频播放API之MediaPlayer用法示例

本文实例讲述了android编程视频播放api之mediaplayer用法。分享给大家供大家参考，具体如下：

现在项目要做音视频这块功能，这正是我相对比较薄弱的地方，项目中要用到，赶紧抓紧时间学习。前面有一编介绍不错的文章，值得学习。

这里给出一个较为简单的示例：

/**
 * android api mediaplayer示例
 *
 * @description：
 * @author ldm
 * @date 2016-4-20 上午10:42:06
 */
public class mediaplayeractivity extends activity implements onclicklistener {
  private button mlocalvideo;
  private button mstreamvideo;
  private button mlocalaudio;
  private button mresourcesaudio;
  private static final string media = "media";
  private static final int local_audio = 1;
  private static final int resources_audio = 3;
  private static final int stream_video = 5;
  @override
  protected void oncreate(bundle icicle) {
    super.oncreate(icicle);
    setcontentview(r.layout.activity_mediaplayer);
    initviewsandevents();
  }
  private void initviewsandevents() {
    mlocalaudio = (button) findviewbyid(r.id.localaudio);
    mresourcesaudio = (button) findviewbyid(r.id.resourcesaudio);
    mlocalvideo = (button) findviewbyid(r.id.localvideo);
    mstreamvideo = (button) findviewbyid(r.id.streamvideo);
    mlocalaudio.setonclicklistener(this);
    mresourcesaudio.setonclicklistener(this);
    mlocalvideo.setonclicklistener(this);
    mstreamvideo.setonclicklistener(this);
  }
  @override
  public void onclick(view v) {
    switch (v.getid()) {
    case r.id.localaudio:
    case r.id.localvideo:
      intent intent = new intent(mediaplayeractivity.this.getapplication(),
          mediaplayerdemo_audio.class);
      intent.putextra(media, local_audio);
      startactivity(intent);
      break;
    case r.id.resourcesaudio:
      intent resin = new intent(mediaplayeractivity.this.getapplication(),
          mediaplayerdemo_audio.class);
      resin.putextra(media, resources_audio);
      startactivity(resin);
      break;
    case r.id.streamvideo:
      intent streamin = new intent(mediaplayeractivity.this,
          mediaplayerdemo_video.class);
      streamin.putextra(media, stream_video);
      startactivity(streamin);
      break;
    }
  }
}

/**
 * onbufferingupdatelistener可以获取视频音频流的缓冲状态;
 * oncompletionlistener播放完毕监听器
 * onpreparedlistener准备播放相关接口
 * onvideosizechangedlistener注册视频大小改变监听器
 * surfaceholder.callback：surfaceview监听callback
 * @description：
 * @author ldm
 * @date 2016-4-20 上午9:46:16
 */
public class mediaplayer_video extends activity implements
    onbufferingupdatelistener, oncompletionlistener,
    onpreparedlistener, onvideosizechangedlistener, surfaceholder.callback {
  private static final string tag = "mediaplayerdemo";
  //video宽度
  private int mvideowidth;
  //video高度
  private int mvideoheight;
  //播放器mediaplayer
  private mediaplayer mmediaplayer;
  //播放界面surfaceview
  private surfaceview mpreview;
  //媒体播放器的载体 surfaceholder
  private surfaceholder holder;
  //文件路径
  private string path;
  //bundle数据对象
  private bundle extras;
  private static final string media = "media";
  private static final int local_video = 1;
  private static final int resources_audio = 3;
  private static final int stream_video = 5;
  private boolean misvideosizeknown = false;
  private boolean misvideoreadytobeplayed = false;
  @suppresswarnings("deprecation")
  @override
  public void oncreate(bundle icicle) {
    super.oncreate(icicle);
    setcontentview(r.layout.mediaplayer_2);
    mpreview = (surfaceview) findviewbyid(r.id.surface);
    holder = mpreview.getholder();
    holder.addcallback(this);
    //高版本上已经不推荐使用了 ，如果要兼容低版本（如android 2.3或以下版本）要加上这段代码，不然播放时 只会有声音 没有图像。
    holder.settype(surfaceholder.surface_type_push_buffers);
    extras = getintent().getextras();
  }
  private void playvideo(integer media) {
    docleanup();
    try {
      switch (media) {
        case local_video://本地文件（如sd卡）
          /*
           * todo:将路径变量设置为本地媒体文件路径。
           */
          path = "";//这里要填写你所播放音视频的文件路径
          if (path == "") {
            toast
                .maketext(
                    mediaplayer_video.this,
                    "please edit mediaplayerdemo_video activity, "
                        + "and set the path variable to your media file path."
                        + " your media file must be stored on sdcard.",
                    toast.length_long).show();
          }
          break;
        case stream_video://流文件
          /**
           * 路径变量设置为mp4或3gpp格式的url。应该使用http协议。
           * 媒体播放器只能通过流的形式获取数据，所以需要:
           * 1。必须是媒体流数据。
           * 2。必须合理剪辑。
           */
          path = "";
          if (path == "") {
            // tell the user to provide a media file url.
            toast
                .maketext(
                    mediaplayer_video.this,
                    "please edit mediaplayerdemo_video activity,"
                        + " and set the path variable to your media file url.",
                    toast.length_long).show();
          }
          break;
        case resources_audio:
          //播放放在诸如res/raw文件夹下的资源文件
          //直接通过mmediaplayer = mediaplayer.create(this, r.raw.test_cbr);
          //可以参考api demos中audiofxdemo类文件
          break;
      }
      // 创建mediaplayer对象，传入文件数据并设备监听
      mmediaplayer = new mediaplayer();
      mmediaplayer.setdatasource(path);
      mmediaplayer.setdisplay(holder);
      //使用 create() 方法创建的 mediaplayer, 直接指定了 媒体资源, 不需要再进行 调用 prepare() 方法;
      mmediaplayer.prepare();
      mmediaplayer.setonbufferingupdatelistener(this);
      mmediaplayer.setoncompletionlistener(this);
      mmediaplayer.setonpreparedlistener(this);
      mmediaplayer.setonvideosizechangedlistener(this);
      //指定音频流类型
      mmediaplayer.setaudiostreamtype(audiomanager.stream_music);
    } catch (exception e) {
      log.e(tag, "error: " + e.getmessage(), e);
    }
  }
  public void onbufferingupdate(mediaplayer arg0, int percent) {
    log.d(tag, "onbufferingupdate percent:" + percent);
  }
  public void oncompletion(mediaplayer arg0) {
    log.d(tag, "oncompletion called");
  }
  public void onvideosizechanged(mediaplayer mp, int width, int height) {
    log.v(tag, "onvideosizechanged called");
    if (width == 0 || height == 0) {
      log.e(tag, "invalid video width(" + width + ") or height(" + height + ")");
      return;
    }
    misvideosizeknown = true;
    mvideowidth = width;
    mvideoheight = height;
    if (misvideoreadytobeplayed && misvideosizeknown) {
      startvideoplayback();
    }
  }
  public void onprepared(mediaplayer mediaplayer) {
    log.d(tag, "onprepared called");
    misvideoreadytobeplayed = true;
    if (misvideoreadytobeplayed && misvideosizeknown) {
      startvideoplayback();
    }
  }
  public void surfacechanged(surfaceholder surfaceholder, int i, int j, int k) {
    log.d(tag, "surfacechanged called");
  }
  public void surfacedestroyed(surfaceholder surfaceholder) {
    log.d(tag, "surfacedestroyed called");
  }
  public void surfacecreated(surfaceholder holder) {
    log.d(tag, "surfacecreated called");
    playvideo(extras.getint(media));
  }
  @override
  protected void onpause() {
    super.onpause();
    releasemediaplayer();
    docleanup();
  }
  @override
  protected void ondestroy() {
    super.ondestroy();
    releasemediaplayer();
    docleanup();
  }
  private void releasemediaplayer() {
    if (mmediaplayer != null) {
      mmediaplayer.release();
      mmediaplayer = null;
    }
  }
  private void docleanup() {
    mvideowidth = 0;
    mvideoheight = 0;
    misvideoreadytobeplayed = false;
    misvideosizeknown = false;
  }
  private void startvideoplayback() {
    log.v(tag, "startvideoplayback");
    holder.setfixedsize(mvideowidth, mvideoheight);
    mmediaplayer.start();
  }
}

布局文件activity_mediaplayer

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  >
  <button android:id="@+id/localvideo"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:text="@string/local_video"
  />
  <button android:id="@+id/streamvideo"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:text="@string/stream_video"
  />
  <button android:id="@+id/localaudio"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:text="@string/local_audio"
  />
  <button android:id="@+id/resourcesaudio"
    android:layout_height="wrap_content"
    android:layout_width="match_parent"
    android:text="@string/res_audio"
  />
</linearlayout>

布局文件activity_mediaplayer_video

<?xml version="1.0" encoding="utf-8"?>
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="match_parent"
  android:layout_height="match_parent">
  <surfaceview android:id="@+id/surface"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center">
  </surfaceview>
</linearlayout>

更多关于android相关内容感兴趣的读者可查看本站专题：《android多媒体操作技巧汇总(音频,视频,录音等)》、《android开发入门与进阶教程》、《android视图view技巧总结》、《android编程之activity操作技巧总结》、《android数据库操作技巧总结》、《android文件操作技巧汇总》、《android资源操作技巧汇总》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。