我有兴趣能够＆＃34; prebuffer＆＃34;当VideoView B 正在播放时，VideoView A 。这可能吗？
于2015年1月19日添加以下代码
下面的代码抓取每个玩家的MediaPlayer的引用。当MediaPlayer A开始渲染时，MediaPlayer B将调用stop（），release（），setDataSource（url），prepareAsync（）。 MediaPlayer A完成后，Media Player B将调用start（）。
public class PrebufferingActivity extends Activity {
private VideoView player1;
private VideoView player2;
private MediaPlayer mediaPlayer1;
private MediaPlayer mediaPlayer2;
public static final String URL_1 = "sample1.mp4";
public static final String URL_2 = "sample2.mp4";
public boolean FIRST_TIME = true;
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_prebuffering);
player1 = (VideoView) findViewById(R.id.videoPlayer1);
player2 = (VideoView) findViewById(R.id.videoPlayer2);
player1.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
});
player2.setOnTouchListener(new OnTouchListener(){
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
return false;
}
});
player1.setOnCompletionListener(new OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer2.start();
// Toggle visibility. Player1 is completed. Hide Player1. Show Player2.
player2.setVisibility(View.VISIBLE);
player1.setVisibility(View.INVISIBLE);
}
});
player1.setOnInfoListener(new OnInfoListener(){
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra)
{
if(what == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START)
{
mediaPlayer2.stop();
mediaPlayer2.release();
try {
mediaPlayer2.setDataSource(URL_2);
mediaPlayer2.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
});
player1.setOnPreparedListener(new OnPreparedListener(){
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer1 = mp;
if(FIRST_TIME == true) {
mediaPlayer1.start();
player1.requestFocus();
FIRST_TIME = false;
}
}
});
player2.setOnCompletionListener(new OnCompletionListener(){
@Override
public void onCompletion(MediaPlayer mp) {
mediaPlayer1.start();
player1.requestFocus();
// Toggle visibility. Player2 is completed. Hide Player2. Show Player1.
player1.setVisibility(View.VISIBLE);
player2.setVisibility(View.INVISIBLE);
}
});
player2.setOnInfoListener(new OnInfoListener(){
@Override
public boolean onInfo(MediaPlayer mp, int what, int extra)
{
if(what == MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START)
{
// Prepare Player 2
mediaPlayer1.stop();
mediaPlayer1.release();
try {
mediaPlayer1.setDataSource(PrebufferingActivity.URL_1);
mediaPlayer1.prepareAsync();
} catch (Exception e) {
e.printStackTrace();
}
}
return false;
}
});
player2.setOnPreparedListener(new OnPreparedListener(){
@Override
public void onPrepared(MediaPlayer mp) {
mediaPlayer2 = mp;
}
});
// Player 1
player1.setMediaController(new MediaController(this));
player1.setVideoURI(Uri.parse(URL_1));
// Player 2
player2.setMediaController(new MediaController(this));
player2.setVideoURI(Uri.parse(URL_2));
}
答案 0 :(得分：3)
假设您使用MediaPlayer来处理VideoView内视频的播放，可以使用prepareAsync()方法来实现此目的。 prepareAsync()方法基本上执行与prepare()相同的功能，用于缓冲和准备视频，但可以在后台异步完成。
修改
我做了类似的事情，但实际上我使用了SurfaceView。要处理另一个流，只需创建另一个MediaPlayer实例。以下示例将创建两个MediaPlayer实例并缓冲第一个视频。在准备好第一个视频后，第二个视频将被异步缓冲。然后，第一个MediaPlayer绑定到SurfaceView，并启动第一个视频。当第一个视频播放完毕后，将释放相应的MediaPlayer实例，附加辅助实例，并自动启动第二个视频。以下示例代码已经过测试并且工作正常：
public class StreamingActivity extends Activity implements SurfaceHolder.Callback, MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener
{
MediaPlayer mediaPlayerPrimary;
MediaPlayer mediaPlayerSecondary;
SurfaceHolder surfaceHolder;
SurfaceView surfaceView;
String videoSourcePrimary = "videoSourcePrimaryURL";
String videoSourceSecondary = "videoSourceSecondaryURL";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.streaming_activity_layout);
/** Create SurfaceView */
surfaceView = (SurfaceView) findViewById(R.id.surface_view);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(this);
}
@Override
public void surfaceCreated(SurfaceHolder arg0)
{
try
{
/** Create MediaPlayer(s) */
mediaPlayerPrimary = new MediaPlayer();
mediaPlayerSecondary = new MediaPlayer();
/** Attach primary MediaPlayer to SurfaceView */
mediaPlayerPrimary.setDisplay(surfaceHolder);
/** Set sources */
mediaPlayerPrimary.setDataSource(videoSourcePrimary);
mediaPlayerSecondary.setDataSource(videoSourceSecondary);
/** Prepare MediaPlayer(s) */
mediaPlayerPrimary.prepare();
mediaPlayerSecondary.prepareAsync();
/** Set listeners */
mediaPlayerPrimary.setOnPreparedListener(this);
mediaPlayerPrimary.setOnCompletionListener(this);
mediaPlayerSecondary.setOnPreparedListener(this);
mediaPlayerSecondary.setOnCompletionListener(this);
/** Set audio stream type */
mediaPlayerPrimary.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaPlayerSecondary.setAudioStreamType(AudioManager.STREAM_MUSIC);
}
catch (Exception e)
{
e.printStackTrace();
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3)
{
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0)
{
}
@Override
public void onPrepared(MediaPlayer mp)
{
if (mp == mediaPlayerPrimary)
{
/** First video ready, start playback */
mediaPlayerPrimary.start();
}
else if (mp == mediaPlayerSecondary)
{
/** Second video is ready */
}
}
@Override
public void onCompletion(MediaPlayer mp)
{
/** First video is completed, start second video */
mediaPlayerPrimary.release();
mediaPlayerSecondary.setDisplay(surfaceHolder);
mediaPlayerSecondary.start();
}
@Override
public boolean onCreateOptionsMenu(Menu menu)
{
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.streaming_activity_menu, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings)
{
return true;
}
return super.onOptionsItemSelected(item);
}
}