對於視訊播放器，市面上也有很多，也做得比較好，寫這篇文章目的只是為了讓大家瞭解播放器的開發過程，也讓自己再次熟悉下這部分的程式碼。有些播放器用SDL進行視訊渲染，但是這篇文章只寫基礎。用vitamio是為了支援多種視訊格式如swf、flv、avi、asf、f4v、mkv、mov、rmvb、tp、ts、wmv、m3u8等市面上的視訊格式都涵蓋了

接下來就是程式碼開始了。

對於播放器首先要有播放檢視，這裡抽象為VideoView繼承SurfaceView，所有的播放邏輯都這這裡。其次有控制視訊播放的介面如暫停、播放、進度條，滑動設定視訊音量大小等，這裡抽象為MediaController繼承

VideoView程式碼如下：

package com.example.videotest.widget;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.media.AudioManager;
import android.net.Uri;
import 
 
android.util.AttributeSet;
import android.util.DisplayMetrics;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.ViewGroup.LayoutParams;

import com.example.videotest.R;
import 
 
com.example.videotest.widget.MediaController.MediaPlayerControl;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;

import io.vov.utils.Log;
import io.vov.vitamio.MediaPlayer;
import io.vov.vitamio.MediaPlayer.OnBufferingUpdateListener;
import io.vov.vitamio.MediaPlayer.OnCompletionListener;
import io.vov.vitamio.MediaPlayer.OnErrorListener;
import io.vov.vitamio.MediaPlayer.OnInfoListener;
import io.vov.vitamio.MediaPlayer.OnPreparedListener;
import io.vov.vitamio.MediaPlayer.OnSeekCompleteListener;
import io.vov.vitamio.MediaPlayer.OnSubtitleUpdateListener;
import io.vov.vitamio.MediaPlayer.OnVideoSizeChangedListener;


public class VideoView extends SurfaceView implements MediaPlayerControl{

   private Uri mUri;
   private long mDuration;
   /**
    * 視訊狀態機
    */
private static final int STATE_ERROR = -1;
   private static final int STATE_IDLE = 0;
   private static final int STATE_PREPARING = 1;
   private static final int STATE_PREPARED = 2;
   private static final int STATE_PLAYING = 3;
   private static final int STATE_PAUSED = 4;
   private static final int STATE_PLAYBACK_COMPLETED = 5;
   private static final int STATE_SUSPEND = 6;
   private static final int STATE_RESUME = 7;
   private static final int STATE_SUSPEND_UNSUPPORTED = 8;

   private int mCurrentState = STATE_IDLE;
   private int mTargetState = STATE_IDLE;

   private float mAspectRatio = 0;
   private int mVideoLayout = VIDEO_LAYOUT_SCALE;
   public static final int VIDEO_LAYOUT_ORIGIN = 0;
   public static final int VIDEO_LAYOUT_SCALE = 1;
   public static final int VIDEO_LAYOUT_STRETCH = 2;
   public static final int VIDEO_LAYOUT_ZOOM = 3;

   private SurfaceHolder mSurfaceHolder = null;
   private MediaPlayer mMediaPlayer = null;
   private int mVideoWidth;
   private int mVideoHeight;
   private float mVideoAspectRatio;
   private int mSurfaceWidth;
   private int mSurfaceHeight;
   private MediaController mMediaController;
   private OnCompletionListener mOnCompletionListener;
   private OnPreparedListener mOnPreparedListener;
   private OnErrorListener mOnErrorListener;
   private OnSeekCompleteListener mOnSeekCompleteListener;
   private OnSubtitleUpdateListener mOnSubtitleUpdateListener;
   private OnInfoListener mOnInfoListener;
   private OnBufferingUpdateListener mOnBufferingUpdateListener;
   private int mCurrentBufferPercentage;
   private long mSeekWhenPrepared;
   private boolean mCanPause = true;
   private boolean mCanSeekBack = true;
   private boolean mCanSeekForward = true;
   private Context mContext;

   public VideoView(Context context) {
      super(context);
      initVideoView(context);
   }

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

   public VideoView(Context context, AttributeSet attrs, int defStyle) {
      super(context, attrs, defStyle);
      initVideoView(context);
   }

   @Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
      int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
      int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
      setMeasuredDimension(width, height);
   }

   /**
    * Set the display options
    * 
    * @param layout <ul>    * <li>{@link #VIDEO_LAYOUT_ORIGIN}
    * <li>{@link #VIDEO_LAYOUT_SCALE}
    * <li>{@link #VIDEO_LAYOUT_STRETCH}
    * <li>{@link #VIDEO_LAYOUT_ZOOM}
    * </ul>    * @param aspectRatio 視訊寬高比，將自動檢測
    */
public void setVideoLayout(int layout, float aspectRatio) {
      LayoutParams lp = getLayoutParams();
      DisplayMetrics disp = mContext.getResources().getDisplayMetrics();
      int windowWidth = disp.widthPixels, windowHeight = disp.heightPixels;
      float windowRatio = windowWidth / (float) windowHeight;
      float videoRatio = aspectRatio <= 0.01f ? mVideoAspectRatio : aspectRatio;
      mSurfaceHeight = mVideoHeight;
      mSurfaceWidth = mVideoWidth;
      if (VIDEO_LAYOUT_ORIGIN == layout && mSurfaceWidth < windowWidth && mSurfaceHeight < windowHeight) {
         lp.width = (int) (mSurfaceHeight * videoRatio);
         lp.height = mSurfaceHeight;
      } else if (layout == VIDEO_LAYOUT_ZOOM) {
         lp.width = windowRatio > videoRatio ? windowWidth : (int) (videoRatio * windowHeight);
         lp.height = windowRatio < videoRatio ? windowHeight : (int) (windowWidth / videoRatio);
      } else {
//       boolean full = layout == VIDEO_LAYOUT_STRETCH;
//       lp.width = (full || windowRatio < videoRatio) ? windowWidth : (int) (videoRatio * windowHeight);
//       lp.height = (full || windowRatio > videoRatio) ? windowHeight : (int) (windowWidth / videoRatio);
}
      setLayoutParams(lp);
      getHolder().setFixedSize(mSurfaceWidth, mSurfaceHeight);
      Log.d("VIDEO: %dx%dx%f, Surface: %dx%d, LP: %dx%d, Window: %dx%dx%f", mVideoWidth, mVideoHeight, mVideoAspectRatio, mSurfaceWidth, mSurfaceHeight, lp.width, lp.height, windowWidth, windowHeight, windowRatio);
      mVideoLayout = layout;
      mAspectRatio = aspectRatio;
   }

   private void initVideoView(Context ctx) {
      mContext = ctx;
      mVideoWidth = 0;
      mVideoHeight = 0;
      getHolder().addCallback(mSHCallback);
      setFocusable(true);
      setFocusableInTouchMode(true);
      requestFocus();
      mCurrentState = STATE_IDLE;
      mTargetState = STATE_IDLE;
      if (ctx instanceof Activity)
         ((Activity) ctx).setVolumeControlStream(AudioManager.STREAM_MUSIC);
   }

   public boolean isValid() {
      return (mSurfaceHolder != null && mSurfaceHolder.getSurface().isValid());
   }

   public void setVideoPath(String path) {
      setVideoURI(Uri.parse(path));
   }

   public void setVideoURI(Uri uri) {
      mUri = uri;
      mSeekWhenPrepared = 0;
      openVideo();
      requestLayout();
      invalidate();
   }

   public void stopPlayback() {
      if (mMediaPlayer != null) {
         mMediaPlayer.stop();
         mMediaPlayer.release();
         mMediaPlayer = null;
         mCurrentState = STATE_IDLE;
         mTargetState = STATE_IDLE;
      }
   }

   private void openVideo() {
      if (mUri == null || mSurfaceHolder == null)
         return;

      Intent i = new Intent("com.android.music.musicservicecommand");
      i.putExtra("command", "pause");
      mContext.sendBroadcast(i);

      release(false);
      try {
         mDuration = -1;
         mCurrentBufferPercentage = 0;
         mMediaPlayer = new MediaPlayer(mContext);
         mMediaPlayer.setOnPreparedListener(mPreparedListener);
         mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
         mMediaPlayer.setOnCompletionListener(mCompletionListener);
         mMediaPlayer.setOnErrorListener(mErrorListener);
         mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
         mMediaPlayer.setOnInfoListener(mInfoListener);
         mMediaPlayer.setOnSeekCompleteListener(mSeekCompleteListener);
         mMediaPlayer.setOnSubtitleUpdateListener(mSubtitleUpdateListener);
         mMediaPlayer.setDataSource(mContext, mUri);
         mMediaPlayer.setDisplay(mSurfaceHolder);
         mMediaPlayer.setScreenOnWhilePlaying(true);
         mMediaPlayer.prepareAsync();
         mCurrentState = STATE_PREPARING;
         attachMediaController();
      } catch (IOException ex) {
         Log.e("Unable to open content: " + mUri, ex);
         mCurrentState = STATE_ERROR;
         mTargetState = STATE_ERROR;
         mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
         return;
      } catch (IllegalArgumentException ex) {
         Log.e("Unable to open content: " + mUri, ex);
         mCurrentState = STATE_ERROR;
         mTargetState = STATE_ERROR;
         mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
         return;
      }
   }

   public void setMediaController(MediaController controller) {
      if (mMediaController != null)
         mMediaController.hide();
      mMediaController = controller;
      attachMediaController();
   }

// View mView;
// public void setView(View view){
//    this.mView = view;
// }
private void attachMediaController() {
      if (mMediaPlayer != null && mMediaController != null) {
         mMediaController.setMediaPlayer(this);
         //View anchorView = ((LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE)).inflate(R.layout.vedio_play_activity, null).findViewById(R.id.media_player_layout);
View anchorView = this.getParent() instanceof View ? (View) this.getParent() : this;
         mMediaController.setAnchorView(anchorView);
         mMediaController.setEnabled(isInPlaybackState());

         if (mUri != null) {
            List<String> paths = mUri.getPathSegments();
            String name = paths == null || paths.isEmpty() ? "null" : paths.get(paths.size() - 1);
            mMediaController.setFileName(name);
         }
      }
   }

   OnVideoSizeChangedListener mSizeChangedListener = new OnVideoSizeChangedListener() {
      @Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
         Log.d("onVideoSizeChanged: (%dx%d)", width, height);
         mVideoWidth = mp.getVideoWidth();
         mVideoHeight = mp.getVideoHeight();
         mVideoAspectRatio = mp.getVideoAspectRatio();
         if (mVideoWidth != 0 && mVideoHeight != 0)
            setVideoLayout(mVideoLayout, mAspectRatio);
      }
   };

   OnPreparedListener mPreparedListener = new OnPreparedListener() {
      @Override
public void onPrepared(MediaPlayer mp) {
         Log.d("onPrepared");
         mCurrentState = STATE_PREPARED;
         mTargetState = STATE_PLAYING;

         if (mOnPreparedListener != null)
            mOnPreparedListener.onPrepared(mMediaPlayer);
         if (mMediaController != null)
            mMediaController.setEnabled(true);
         mVideoWidth = mp.getVideoWidth();
         mVideoHeight = mp.getVideoHeight();
         mVideoAspectRatio = mp.getVideoAspectRatio();

         long seekToPosition = mSeekWhenPrepared;

         if (seekToPosition != 0)
            seekTo(seekToPosition);
         if (mVideoWidth != 0 && mVideoHeight != 0) {
            setVideoLayout(mVideoLayout, mAspectRatio);
            if (mSurfaceWidth == mVideoWidth && mSurfaceHeight == mVideoHeight) {
               if (mTargetState == STATE_PLAYING) {
                  start();
                  if (mMediaController != null)
                     mMediaController.show();
               } else if (!isPlaying() && (seekToPosition != 0 || getCurrentPosition() > 0)) {
                  if (mMediaController != null)
                     mMediaController.show(0);
               }
            }
         } else if (mTargetState == STATE_PLAYING) {
            start();
         }
      }
   };

   private OnCompletionListener mCompletionListener = new OnCompletionListener() {
      @Override
public void onCompletion(MediaPlayer mp) {
         Log.d("onCompletion");
         mCurrentState = STATE_PLAYBACK_COMPLETED;
         mTargetState = STATE_PLAYBACK_COMPLETED;
         if (mMediaController != null)
            mMediaController.hide();
         if (mOnCompletionListener != null)
            mOnCompletionListener.onCompletion(mMediaPlayer);
      }
   };

   private OnErrorListener mErrorListener = new OnErrorListener() {
      @Override
public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
         Log.d("Error: %d, %d", framework_err, impl_err);
         mCurrentState = STATE_ERROR;
         mTargetState = STATE_ERROR;
         if (mMediaController != null)
            mMediaController.hide();

         if (mOnErrorListener != null) {
            if (mOnErrorListener.onError(mMediaPlayer, framework_err, impl_err))
               return true;
         }

         if (getWindowToken() != null) {
            int message = framework_err == MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK ? R.string.VideoView_error_text_invalid_progressive_playback : R.string.VideoView_error_text_unknown;

            new AlertDialog.Builder(mContext).setTitle(R.string.VideoView_error_title).setMessage(message).setPositiveButton(R.string.VideoView_error_button, new DialogInterface.OnClickListener() {
               @Override
public void onClick(DialogInterface dialog, int whichButton) {
                  if (mOnCompletionListener != null)
                     mOnCompletionListener.onCompletion(mMediaPlayer);
               }
            }).setCancelable(false).show();
         }
         return true;
      }
   };

   private OnBufferingUpdateListener mBufferingUpdateListener = new OnBufferingUpdateListener() {
      @Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
         mCurrentBufferPercentage = percent;
         if (mOnBufferingUpdateListener != null)
            mOnBufferingUpdateListener.onBufferingUpdate(mp, percent);
      }
   };

   private OnInfoListener mInfoListener = new OnInfoListener() {
      @Override
public boolean onInfo(MediaPlayer mp, int what, int extra) {
         Log.d("onInfo: (%d, %d)", what, extra);
         if (mOnInfoListener != null) {
            mOnInfoListener.onInfo(mp, what, extra);
         } else if (mMediaPlayer != null) {
            if (what == MediaPlayer.MEDIA_INFO_BUFFERING_START)
               mMediaPlayer.pause();
            else if (what == MediaPlayer.MEDIA_INFO_BUFFERING_END)
               mMediaPlayer.start();
         }

         return true;
      }
   };

   private OnSeekCompleteListener mSeekCompleteListener = new OnSeekCompleteListener() {
      @Override
public void onSeekComplete(MediaPlayer mp) {
         Log.d("onSeekComplete");
         if (mOnSeekCompleteListener != null)
            mOnSeekCompleteListener.onSeekComplete(mp);
      }
   };

   private OnSubtitleUpdateListener mSubtitleUpdateListener = new OnSubtitleUpdateListener() {
      @Override
public void onSubtitleUpdate(byte[] pixels, int width, int height) {
         Log.i("onSubtitleUpdate: bitmap subtitle, %dx%d", width, height);
         if (mOnSubtitleUpdateListener != null)
            mOnSubtitleUpdateListener.onSubtitleUpdate(pixels, width, height);
      }

      @Override
public void onSubtitleUpdate(String text) {
         Log.i("onSubtitleUpdate: %s", text);
         if (mOnSubtitleUpdateListener != null)
            mOnSubtitleUpdateListener.onSubtitleUpdate(text);
      }
   };

   public void setOnPreparedListener(OnPreparedListener l) {
      mOnPreparedListener = l;
   }

   public void setOnCompletionListener(OnCompletionListener l) {
      mOnCompletionListener = l;
   }

   public void setOnErrorListener(OnErrorListener l) {
      mOnErrorListener = l;
   }

   public void setOnBufferingUpdateListener(OnBufferingUpdateListener l) {
      mOnBufferingUpdateListener = l;
   }

   public void setOnSeekCompleteListener(OnSeekCompleteListener l) {
      mOnSeekCompleteListener = l;
   }

   public void setOnSubtitleUpdateListener(OnSubtitleUpdateListener l) {
      mOnSubtitleUpdateListener = l;
   }

   public void setOnInfoListener(OnInfoListener l) {
      mOnInfoListener = l;
   }

   SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback() {
      @Override
public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
         mSurfaceWidth = w;
         mSurfaceHeight = h;
         boolean isValidState = (mTargetState == STATE_PLAYING);
         boolean hasValidSize = (mVideoWidth == w && mVideoHeight == h);
         if (mMediaPlayer != null && isValidState && hasValidSize) {
            if (mSeekWhenPrepared != 0)
               seekTo(mSeekWhenPrepared);
            start();
            if (mMediaController != null) {
               if (mMediaController.isShowing())
                  mMediaController.hide();
               mMediaController.show();
            }
         }
      }

      @Override
public void surfaceCreated(SurfaceHolder holder) {
         mSurfaceHolder = holder;
         if (mMediaPlayer != null && mCurrentState == STATE_SUSPEND && mTargetState == STATE_RESUME) {
            mMediaPlayer.setDisplay(mSurfaceHolder);
            resume();
         } else {
            openVideo();
         }
      }

      @Override
public void surfaceDestroyed(SurfaceHolder holder) {
         mSurfaceHolder = null;
         if (mMediaController != null)
            mMediaController.hide();
         if (mCurrentState != STATE_SUSPEND)
            release(true);
      }
   };

   private void release(boolean cleartargetstate) {
      if (mMediaPlayer != null) {
         mMediaPlayer.reset();
         mMediaPlayer.release();
         mMediaPlayer = null;
         mCurrentState = STATE_IDLE;
         if (cleartargetstate)
            mTargetState = STATE_IDLE;
      }
   }

   @Override
public boolean onTouchEvent(MotionEvent ev) {
      if (isInPlaybackState() && mMediaController != null)
         toggleMediaControlsVisiblity();
      return false;
   }

   @Override
public boolean onTrackballEvent(MotionEvent ev) {
      if (isInPlaybackState() && mMediaController != null)
         toggleMediaControlsVisiblity();
      return false;
   }

   @Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
      boolean isKeyCodeSupported = keyCode != KeyEvent.KEYCODE_BACK && keyCode != KeyEvent.KEYCODE_VOLUME_UP && keyCode != KeyEvent.KEYCODE_VOLUME_DOWN && keyCode != KeyEvent.KEYCODE_MENU && keyCode != KeyEvent.KEYCODE_CALL && keyCode != KeyEvent.KEYCODE_ENDCALL;
      if (isInPlaybackState() && isKeyCodeSupported && mMediaController != null) {
         if (keyCode == KeyEvent.KEYCODE_HEADSETHOOK || keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE || keyCode == KeyEvent.KEYCODE_SPACE) {
            if (mMediaPlayer.isPlaying()) {
               pause();
               mMediaController.show();
            } else {
               start();
               mMediaController.hide();
            }
            return true;
         } else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP && mMediaPlayer.isPlaying()) {
            pause();
            mMediaController.show();
         } else {
            toggleMediaControlsVisiblity();
         }
      }

      return super.onKeyDown(keyCode, event);
   }

   private void toggleMediaControlsVisiblity() {
      if (mMediaController.isShowing()) {
         mMediaController.hide();
      } else {
         mMediaController.show();
      }
   }

   @Override
public void start() {
      if (isInPlaybackState()) {
         mMediaPlayer.start();
         mCurrentState = STATE_PLAYING;
      }
      mTargetState = STATE_PLAYING;
   }

   @Override
public void pause() {
      if (isInPlaybackState()) {
         if (mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            mCurrentState = STATE_PAUSED;
         }
      }
      mTargetState = STATE_PAUSED;
   }

   public void suspend() {
      if (isInPlaybackState()) {
         release(false);
         mCurrentState = STATE_SUSPEND_UNSUPPORTED;
         Log.d("Unable to suspend video. Release MediaPlayer.");
      }
   }

   public void resume() {
      if (mSurfaceHolder == null && mCurrentState == STATE_SUSPEND) {
         mTargetState = STATE_RESUME;
      } else if (mCurrentState == STATE_SUSPEND_UNSUPPORTED) {
         openVideo();
      }
   }

   @Override
public long getDuration() {
      if (isInPlaybackState()) {
         if (mDuration > 0)
            return mDuration;
         mDuration = mMediaPlayer.getDuration();
         return mDuration;
      }
      mDuration = -1;
      return mDuration;
   }

   @Override
public long getCurrentPosition() {
      if (isInPlaybackState())
         return mMediaPlayer.getCurrentPosition();
      return 0;
   }

   @Override
public void seekTo(long msec) {
      if (isInPlaybackState()) {
         mMediaPlayer.seekTo(msec);
         mSeekWhenPrepared = 0;
      } else {
         mSeekWhenPrepared = msec;
      }
   }

   @Override
public boolean isPlaying() {
      return isInPlaybackState() && mMediaPlayer.isPlaying();
   }

   @Override
public int getBufferPercentage() {
      if (mMediaPlayer != null)
         return mCurrentBufferPercentage;
      return 0;
   }

   public void setVolume(float leftVolume, float rightVolume) {
      if (mMediaPlayer != null)
         mMediaPlayer.setVolume(leftVolume, rightVolume);
   }

   public int getVideoWidth() {
      return mVideoWidth;
   }

   public int getVideoHeight() {
      return mVideoHeight;
   }

   public float getVideoAspectRatio() {
      return mVideoAspectRatio;
   }

   public void setVideoQuality(int quality) {
      if (mMediaPlayer != null)
         mMediaPlayer.setVideoQuality(quality);
   }

   public void setBufferSize(int bufSize) {
      if (mMediaPlayer != null)
         mMediaPlayer.setBuffer