如何使用videoview从url流畅地播放视频

Question

我有一个具有VideoView的活动。它正在从url播放视频。我所做的是为了玩得顺利，我在活动开始时放了一个ProgressDialog。并在onPreparedListener内部将其排除在外，使其能够顺利地发挥作用。但还是无济于事。视频像播放一样播放10-20秒，停止5-10秒，然后继续播放。我在Google play Workout Trainer上看到了一个应用程序，如果用户开始看到视频，它会显示一个horizontal progress bar，缓冲视频，然后流畅地播放，无论是慢速连接还是WI-FI。它只需要在开始视频之前完成progressbar。我想知道如何在我的应用程序中实现同样的东西？

我正在做的事情如下：

    public class StartExerciseActivity extends Activity {

    protected void onCreate(Bundle savedInstanceState) {
            // TODO Auto-generated method stub
            super.onCreate(savedInstanceState);
            requestWindowFeature(Window.FEATURE_NO_TITLE);
            setContentView(R.layout.show_exercise);
            tileTextView = (TextView) findViewById(R.id.titleText);
            timerTextView = (TextView) findViewById(R.id.timertxt);
            timerRemainTextView = (TextView) findViewById(R.id.timeremaintxt);
            videoView = (VideoView) findViewById(R.id.video_view);
            stopButton = (Button) findViewById(R.id.stopbut);
            pauseButton = (Button) findViewById(R.id.pausesbut);

    progressDialog = ProgressDialog.show(StartExerciseActivity.this, "",
                    "Buffering video...", true);
            getWindow().setFormat(PixelFormat.TRANSLUCENT);
            tileTextView.setText(Constant.NEWS_TITLE);
            timerTextView.setText(Constant.VIDEO_TIME);
            video_url = Constant.VIDEO_NAME;


            try {
                Uri video = Uri.parse(video_url);
                // videoView.setMediaController(mediaController);
                videoView.setVideoURI(video);
                videoView.setOnPreparedListener(new OnPreparedListener() {
                    public void onPrepared(MediaPlayer mp) {
                        progressDialog.dismiss();
                        videoView.start();
                        updateSeekProgress();

                        RelativeLayout.LayoutParams videoviewlp = new RelativeLayout.LayoutParams(400, 400);
                        videoviewlp.addRule(RelativeLayout.CENTER_HORIZONTAL, RelativeLayout.TRUE);
                        videoviewlp.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);
                        videoView.setLayoutParams(videoviewlp);
                        videoView.invalidate();

    //                  DisplayMetrics metrics = new DisplayMetrics(); getWindowManager().getDefaultDisplay().getMetrics(metrics);
    //                   android.widget.LinearLayout.LayoutParams params = (android.widget.LinearLayout.LayoutParams) videoView.getLayoutParams();
    //                   params.width =  metrics.widthPixels;
    //                   params.height = metrics.heightPixels;
    //                   params.leftMargin = 0;
    //                   videoView.setLayoutParams(params);
                    }
                });
            } catch (Exception e) {
                progressDialog.dismiss();
                System.out.println("Video Play Error :" + e.getMessage());
            }
 pauseButton.setOnClickListener(new View.OnClickListener() {

                public void onClick(View arg0) {
                    if (count == 0) {
                        videoView.pause();
                        count = 1;
                        pauseButton.setBackgroundResource(R.drawable.playbut);

                    } else if (count == 1) {
                        videoView.start();
                        pauseButton.setBackgroundResource(R.drawable.pausebut);
                        count = 0;
                    }
                }
            });
            stopButton.setOnClickListener(new View.OnClickListener() {

                public void onClick(View arg0) {
                    videoView.stopPlayback();
                    pauseButton.setBackgroundResource(R.drawable.playbut);
                }
            });
        }

请帮忙。谢谢

Answer 1

//放入oncreate
new DownloadXML（）.execute（）
//放入oncreate 之外

private class DownloadXML extends AsyncTask<Void, Void, Void> {
            @Override
            protected void onPreExecute() {
                super.onPreExecute();
                // Create a progressbar
                pDialog = new ProgressDialog(StartExerciseActivity.this);
                // Set progressbar title
                pDialog.setTitle("Wait");
                // Set progressbar message
                pDialog.setMessage("Loading...");
                pDialog.setIndeterminate(false);
                // Show progressbar
                pDialog.show();
            }
            @Override
            protected Void doInBackground(Void... params) {
                try {
            videoView.setVideoURI(Uri.parse("http://commonsware.com/misc/test2.3gp"));
                //videoView.setVideoURI(Uri.parse(videofilename));
                videoView.requestFocus();
                videoView.setMediaController(new MediaController(this));        
                } catch (Exception e) {
                    Log.e("Error", e.getMessage());
                    e.printStackTrace();
                }
                return null;
            }
            @Override
            protected void onPostExecute(Void args) {
                // Close progressbar
                pDialog.dismiss();
                videoView.start();
            }
        }