java - Android Mediaplayer 缓冲未完成

Question

我已经实现了一个标准的 MediaPlayer，就像 Android API 示例中的那样。出于某种原因，我的视频只缓冲到 47% 左右然后停止。我不认为这是一个互联网连接问题，因为它每次都停在 46% 或 47%。文件缓冲并通过 native android 视频播放器正常播放。它是一个渐进式下载的 mp4。

这是它的代码:

package com.exact.test;

import android.app.Activity;
import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnBufferingUpdateListener;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.media.MediaPlayer.OnVideoSizeChangedListener;
import android.text.Layout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.ImageButton;
import android.widget.ImageSwitcher;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.VideoView;

public class VideoPlayer extends RelativeLayout implements
OnBufferingUpdateListener, OnCompletionListener,
OnPreparedListener, OnVideoSizeChangedListener, SurfaceHolder.Callback {

    private VideoPlayer me = null; 
    //Components that make up the view
    private VideoView videoView = null;
    private ImageSwitcher imageSwitcher = null;
    private ImageButton btnBack = null;
    private ImageButton btnPlay = null;
    private ImageButton btnStop = null;
    private ImageButton btnForward = null;
    private TextView txtBufferStatus = null;

    //Video playback variables
    private static final String TAG = "VideoPlayer";
    private int mVideoWidth;
    private int mVideoHeight;
    private MediaPlayer mMediaPlayer;
    private SurfaceView mPreview;
    private SurfaceHolder holder;
    public String path = "http://mydomain.com/android/test8.mp4";
    private boolean mIsVideoSizeKnown = false;
    private boolean mIsVideoReadyToBePlayed = false;

    public VideoPlayer(Context context) {
        this(context, null);        
    }

    public VideoPlayer(Context context, AttributeSet attrs) {
        this(context, attrs, 0);        
    }

    public VideoPlayer(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        ((Activity)getContext())
                .getLayoutInflater()
                .inflate(R.layout.videoplayer, this, true);
        me = this;

        //Get all the components in the layout
        //Layout videoLayout = VideoPlayer.
        videoView = (VideoView)findViewById(R.id.videoView);
        imageSwitcher = (ImageSwitcher)findViewById(R.id.ImageSwitcher);
        btnBack = (ImageButton)findViewById(R.id.btnBack);
        btnPlay = (ImageButton)findViewById(R.id.btnPlay);
        btnStop = (ImageButton)findViewById(R.id.btnStop);
        btnForward = (ImageButton)findViewById(R.id.btnForward);
        txtBufferStatus = (TextView)findViewById(R.id.txtBufferStatus);

        btnBack.setOnClickListener(new OnClickListener() {          
            @Override
            public void onClick(View v) {
            }
        });

        btnPlay.setOnClickListener(new OnClickListener() {          
            @Override
            public void onClick(View v) {
                txtBufferStatus.setText("Initilaising...");
                imageSwitcher.setVisibility(INVISIBLE);             
                videoView.setVisibility(VISIBLE);               
                mPreview = (SurfaceView) videoView;             
                holder = mPreview.getHolder();              
                holder.addCallback(me);             
                holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
                txtBufferStatus.setText("Initilaised");
            }
        });

        btnStop.setOnClickListener(new OnClickListener() {          
            @Override
            public void onClick(View v) {
            }
        });

        btnForward.setOnClickListener(new OnClickListener() {           
            @Override
            public void onClick(View v) {
            }
        });
    }

    public void playVideo() {

        doCleanUp();

        Runnable r = new Runnable() {

            @Override
            public void run() {
                try {
                    // Create a new media player and set the listeners
                    txtBufferStatus.setText("Setting up Media Player...");
                    mMediaPlayer = new MediaPlayer();
                    mMediaPlayer.setDataSource(path);
                    mMediaPlayer.setDisplay(holder);
                    txtBufferStatus.setText("Preparing...");
                    mMediaPlayer.prepareAsync();
                    mMediaPlayer.setOnBufferingUpdateListener(me);
                    mMediaPlayer.setOnCompletionListener(me);
                    mMediaPlayer.setOnPreparedListener(me);
                    mMediaPlayer.setOnVideoSizeChangedListener(me);
                    mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
                } catch (Exception e) {
                    Log.e(TAG, "error: " + e.getMessage(), e);
                }                   
            }
        };
        Thread t = new Thread(r);
        t.start();
    }

    public void onBufferingUpdate(MediaPlayer arg0, int percent) {
        Log.d(TAG, "onBufferingUpdate percent:" + percent);       
        txtBufferStatus.setText(Integer.toString(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");
        txtBufferStatus.setText("Prepared");
        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();
    }

    public void releaseMediaPlayer() {
        if (mMediaPlayer != null) {
            mMediaPlayer.release();
            mMediaPlayer = null;
        }
    }

    public void doCleanUp() {
        mVideoWidth = 0;
        mVideoHeight = 0;
        mIsVideoReadyToBePlayed = false;
        mIsVideoSizeKnown = false;
    }

    private void startVideoPlayback() {
        Log.v(TAG, "startVideoPlayback");
        holder.setFixedSize(mVideoWidth, mVideoHeight);
        mMediaPlayer.start();
    }

}

Answer 1

很可能是缓冲结束了。
你的缓冲可以这样:10% - 23% - 30% - 47% - 100%