我花了几个小时在 android 中开发一个合适的流媒体视频播放器，并且非常成功地创建了一个可以很好地播放诸如歌曲、预告片等小内容的播放器。但是播放器对于电影和电视节目等大型内容表现出一些异常行为，因为它需要大量流式传输，播放器开始滞后于此类数据。谁能帮我破解这样一个问题的解决方案。
提前致谢...
这是来源:
public class player extends Activity implements OnErrorListener,
OnPreparedListener {
/** Called when the activity is first created. */
private static final int UPDATE_FREQUENCY = 500;
private static final int STEP_VALUE = 4000;
private static final int DIALOG_KEY = 0;
private TextView currentTime, duration;
private VideoView videoView;
private SeekBar seekbar = null;
private View mediacontroller;
private ProgressDialog progressDialog = null;
private ImageButton playButton = null;
private ImageButton prevButton = null;
private ImageButton nextButton = null;
private boolean isMoveingSeekBar = false;
private boolean isMediaCtrlShown = false;
private final Handler handler = new Handler();
private boolean isStarted = true;
private String currentFile = "singham_320b";
private boolean isCustomSeekButtonClick = false;
private boolean isPauseButtonClick = false;
private static boolean isMyDialogShowing = false;
private static int percentageBuffer = 0;
private int mpCurrentPosition;
int hh = 00, mm = 00, ss = 00, ms = 00;
int i = 0;
int previouPosition = 0;
private Runnable onEverySecond=new Runnable() {
public void run() {
if (videoView!=null) {
seekbar.setProgress(videoView.getCurrentPosition());
}
if (!isPauseButtonClick) {
mediacontroller.postDelayed(onEverySecond, 1000);
}
}
};
private final Runnable updatePositionRunnable = new Runnable()
{
public void run()
{
updatePosition();
}
};
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setUpMyDialog();
showMyDialog();
videoView = (VideoView) findViewById(R.id.videoview);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
seekbar = (SeekBar) findViewById(R.id.seekbar);
currentTime = (TextView) findViewById(R.id.currentTime);
playButton = (ImageButton) findViewById(R.id.play);
prevButton = (ImageButton) findViewById(R.id.prev);
nextButton = (ImageButton) findViewById(R.id.next);
duration = (TextView) findViewById(R.id.duration);
mediacontroller = findViewById(R.id.mediacontroller);
videoView.setOnErrorListener(this);
videoView.setOnPreparedListener(this);
videoView.setOnTouchListener(new View.OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
if (!isMediaCtrlShown)
{
mediacontroller.setVisibility(View.GONE);
isMediaCtrlShown = true;
}
else
{
mediacontroller.setVisibility(View.VISIBLE);
isMediaCtrlShown = false;
}
return false;
}
});
Uri video = Uri.parse("http://wpc.1B42.edgecastcdn.net/001B42/mobile/songs/pyaar_ka_punchnama/life_sahi_hai_320b.mp4");
videoView.setVideoURI(video);
seekbar.setOnSeekBarChangeListener(seekBarChanged);
playButton.setOnClickListener(onButtonClick);
nextButton.setOnClickListener(onButtonClick);
prevButton.setOnClickListener(onButtonClick);
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
// TODO Auto-generated method stub
return false;
}
public void calculateTime(int ms) {
ss = ms / 1000;
mm = ss / 60;
ss %= 60;
hh = mm / 60;
mm %= 60;
hh %= 24;
}
@Override
public void onPrepared(MediaPlayer mp)
{
dismissMyDialog();
videoView.start();
mediacontroller.setVisibility(View.VISIBLE);
isMediaCtrlShown = false;
seekbar.setProgress(0);
seekbar.setMax(videoView.getDuration());
ms = videoView.getDuration();
calculateTime(ms);
duration.setText("" + hh + ":" + mm + ":" + ss);
ms = videoView.getCurrentPosition();
calculateTime(ms);
currentTime.setText("" + hh + ":" + mm + ":" + ss);
playButton.setImageResource(android.R.drawable.ic_media_pause);
updatePosition();
isStarted = true;
mp.setOnBufferingUpdateListener(new OnBufferingUpdateListener()
{
// show updated information about the buffering progress
@Override
public void onBufferingUpdate(MediaPlayer mp, int percent)
{
Log.d(this.getClass().getName(), "percent: " + percent);
percentageBuffer = percent;
secondarySeekBarProgressUpdater(percent);
// progress.setSecondaryProgress(percent);
if (i == 0)
{
i = i + 1;
previouPosition = mp.getCurrentPosition();
}
else if (i == 1)
{
if (mp.getCurrentPosition() == previouPosition)
{
if (!isPauseButtonClick)
{
showMyDialog();
if (percent == 100)
{
dismissMyDialog();
}
}
}
else
{
i = 0;
previouPosition = 0;
dismissMyDialog();
}
}
else if (isCustomSeekButtonClick)
{
isCustomSeekButtonClick = false;
if (mpCurrentPosition == mp.getCurrentPosition())
{
showMyDialog();
if (percent == 100)
{
dismissMyDialog();
}
}
else
{
dismissMyDialog();
}
}
}
});
mp.setOnSeekCompleteListener(new OnSeekCompleteListener()
{
public void onSeekComplete(MediaPlayer mp)
{
if (mp.isPlaying())
{
}
else
{
onStart();
onPause();
onStart();
}
}
});
}
private SeekBar.OnSeekBarChangeListener seekBarChanged = new SeekBar.OnSeekBarChangeListener()
{
@Override
public void onStopTrackingTouch(SeekBar seekBar)
{
isMoveingSeekBar = false;
}
@Override
public void onStartTrackingTouch(SeekBar seekBar)
{
isMoveingSeekBar = true;
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,boolean fromUser)
{
Log.e("",""+progress+""+percentageBuffer);
if (fromUser)
{
isCustomSeekButtonClick = fromUser;
videoView.seekTo(progress);
mpCurrentPosition = progress;
Log.e("OnSeekBarChangeListener", "onProgressChanged");
}
if (isMoveingSeekBar)
{
videoView.seekTo(progress);
Log.i("OnSeekBarChangeListener", "onProgressChanged");
}
}
};
private View.OnClickListener onButtonClick = new View.OnClickListener() {
@Override
public void onClick(View v)
{
switch (v.getId())
{
case R.id.play:
{
if (videoView.isPlaying())
{
handler.removeCallbacks(updatePositionRunnable);
isPauseButtonClick = true;
videoView.pause();
playButton.setImageResource(android.R.drawable.ic_media_play);
}
else
{
if (isStarted)
{
videoView.start();
isPauseButtonClick = false;
playButton.setImageResource(android.R.drawable.ic_media_pause);
updatePosition();
}
else
{
startPlay(currentFile);
isPauseButtonClick = false;
videoView.start();
}
}
break;
}
case R.id.next:
{
int seekto = videoView.getCurrentPosition() + STEP_VALUE;
if (seekto > videoView.getDuration())
seekto = videoView.getDuration();
videoView.pause();
videoView.seekTo(seekto);
/*
* try { Thread.sleep(15000); } catch (InterruptedException e) {
* // TODO Auto-generated catch block e.printStackTrace(); }
*/
// player.pause();
videoView.start();
break;
}
case R.id.prev: {
int seekto = videoView.getCurrentPosition() - STEP_VALUE;
if (seekto < 0)
seekto = 0;
videoView.pause();
videoView.seekTo(seekto);
// player.pause();
videoView.start();
break;
}
}
}
};
private void updatePosition()
{
handler.removeCallbacks(updatePositionRunnable);
seekbar.setProgress(videoView.getCurrentPosition());
ms = videoView.getCurrentPosition();
calculateTime(ms);
currentTime.setText("" + hh + ":" + mm + ":" + ss);
handler.postDelayed(updatePositionRunnable, UPDATE_FREQUENCY);
}
private void startPlay(String file)
{
Log.i("Selected: ", file);
// selelctedFile.setText(file);
seekbar.setProgress(0);
videoView.stopPlayback();
videoView.start();
seekbar.setMax(videoView.getDuration());
playButton.setImageResource(android.R.drawable.ic_media_pause);
updatePosition();
isStarted = true;
}
void setUpMyDialog()
{
if (progressDialog == null)
{
progressDialog = (ProgressDialog) onCreateDialog(DIALOG_KEY);
progressDialog = new ProgressDialog(player.this);
progressDialog.setMessage("Loading...");
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
}
}
void showMyDialog()
{
Log.e("showMyDialog***", "****" + isMyDialogShowing);
if (!isMyDialogShowing)
{
isMyDialogShowing = true;
Log.e("showMyDialog: true***", "****" + isMyDialogShowing);
if (progressDialog != null && !progressDialog.isShowing())
{
Log.e("showMyDialog: true***", "****progressDialog" + progressDialog.isShowing());
progressDialog.show();
}
else if(progressDialog == null)
{
setUpMyDialog();
progressDialog.show();
}
}
}
void dismissMyDialog()
{
Log.e("dismissMyDialog***", "****");
if (progressDialog != null && progressDialog.isShowing())
{
progressDialog.dismiss();
progressDialog = null;
isMyDialogShowing = false;
}
}
void killMyDialog()
{
isMyDialogShowing = false;
}
private void secondarySeekBarProgressUpdater(int percent){
seekbar.setSecondaryProgress(percent);
}
最佳答案
我的直觉告诉您，您可能会因为专注于播放器而忽略了一些东西，特别是因为它适用于较小的内容。您是否考虑过检查流式传输服务器？如果服务器不能胜任传输较大文件的任务，那么播放器就无能为力了。此外，您可以调整来自服务器的数据包大小，以帮助播放器一次使用较小的“咬合”(请原谅双关语)媒体来管理播放。尝试使用免费的 Apple Darwin 流媒体服务器。有一个适用于 Apache、Windows 和其他版本的版本，而且它的配置性很强。给自己准备一组不同大小的文件，并尝试确定在什么大小播放开始失败。该数字将为您提供有关问题所在的重要线索，无论是传输的服务器数据包大小、Android 环境中的可用内存还是其他地方。无论数字如何，请尝试从服务器设置较小的数据包大小。这应该可以让您的播放器减少工作量，并有望改善播放效果。
您可以从网上的许多地方获得 Darwin 服务器。 Here is one such link .维基百科也有一些有用的信息和此服务器的一些链接，find them here .祝你在这方面的研究顺利。
弗兰克。
关于android - 如何为大型内容创建流媒体视频播放器？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/7230382/