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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https://www.jb51.net/article/121881.htm,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。
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