Android视频播放之MediaPlayer

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。看到了一编介绍不错的文章http://blog.csdn.net/shulianghan/article/details/38487967，值得学习。

/**
* 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();
}
}

<?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>

<?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>