自定义视频播放控件，自适配视频尺寸，可播放本地和网络视频

一.自定义控件

public class FixedTextureVideoView extends TextureView
        implements MediaController.MediaPlayerControl {
    private String TAG = "TextureVideoView";
    // settable by the client
    private Uri mUri;
    private Map mHeaders;

    // all possible internal states
    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;

    // mCurrentState is a TextureVideoView object's current state.
    // mTargetState is the state that a method caller intends to reach.
    // For instance, regardless the TextureVideoView object's current state,
    // calling pause() intends to bring the object to a target state
    // of STATE_PAUSED.
    private int mCurrentState = STATE_IDLE;
    private int mTargetState  = STATE_IDLE;

    // All the stuff we need for playing and showing a video
    private Surface mSurface = null;
    private MediaPlayer mMediaPlayer = null;
    private int         mAudioSession;
    private int         mVideoWidth;
    private int         mVideoHeight;
    private MediaController mMediaController;
    private MediaPlayer.OnCompletionListener mOnCompletionListener;
    private MediaPlayer.OnPreparedListener mOnPreparedListener;
    private int         mCurrentBufferPercentage;
    private MediaPlayer.OnErrorListener mOnErrorListener;
    private MediaPlayer.OnInfoListener mOnInfoListener;
    private int         mSeekWhenPrepared;  // recording the seek position while preparing
    private boolean     mCanPause;
    private boolean     mCanSeekBack;
    private boolean     mCanSeekForward;

    private int fixedWidth;
    private int fixedHeight;
    private Matrix matrix;
    private boolean isMute;

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

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

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


    public void setFixedSize(int width, int height) {
        fixedHeight = height;
        fixedWidth = width;
        Log.d(TAG, "setFixedSize,width=" + width + "height=" + height);
        requestLayout();
    }

    public int getVideoHeight() {
        return mVideoHeight;
    }

    public int getVideoWidth() {
        return mVideoWidth;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        if (fixedWidth == 0 || fixedHeight == 0) {
            defaultMeasure(widthMeasureSpec, heightMeasureSpec);
        } else {
            setMeasuredDimension(fixedWidth, fixedHeight);
        }
        Log.d(TAG, String.format("onMeasure, fixedWidth=%d,fixedHeight=%d", fixedWidth, fixedHeight));
    }

    protected void defaultMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        //Log.i("@@@@", "onMeasure(" + MeasureSpec.toString(widthMeasureSpec) + ", "
        //        + MeasureSpec.toString(heightMeasureSpec) + ")");

        int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
        int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
        if (mVideoWidth > 0 && mVideoHeight > 0) {

            int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec);
            int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec);
            int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec);
            int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec);

            if (widthSpecMode == MeasureSpec.EXACTLY && heightSpecMode == MeasureSpec.EXACTLY) {
                // the size is fixed
                width = widthSpecSize;
                height = heightSpecSize;

                // for compatibility, we adjust size based on aspect ratio
                if ( mVideoWidth * height  < width * mVideoHeight ) {
                    //Log.i("@@@", "image too wide, correcting");
                    width = height * mVideoWidth / mVideoHeight;
                } else if ( mVideoWidth * height  > width * mVideoHeight ) {
                    //Log.i("@@@", "image too tall, correcting");
                    height = width * mVideoHeight / mVideoWidth;
                }
            } else if (widthSpecMode == MeasureSpec.EXACTLY) {
                // only the width is fixed, adjust the height to match aspect ratio if possible
                width = widthSpecSize;
                height = width * mVideoHeight / mVideoWidth;
                if (heightSpecMode == MeasureSpec.AT_MOST && height > heightSpecSize) {
                    // couldn't match aspect ratio within the constraints
                    height = heightSpecSize;
                }
            } else if (heightSpecMode == MeasureSpec.EXACTLY) {
                // only the height is fixed, adjust the width to match aspect ratio if possible
                height = heightSpecSize;
                width = height * mVideoWidth / mVideoHeight;
                if (widthSpecMode == MeasureSpec.AT_MOST && width > widthSpecSize) {
                    // couldn't match aspect ratio within the constraints
                    width = widthSpecSize;
                }
            } else {
                // neither the width nor the height are fixed, try to use actual video size
                width = mVideoWidth;
                height = mVideoHeight;
                if (heightSpecMode == MeasureSpec.AT_MOST && height > heightSpecSize) {
                    // too tall, decrease both width and height
                    height = heightSpecSize;
                    width = height * mVideoWidth / mVideoHeight;
                }
                if (widthSpecMode == MeasureSpec.AT_MOST && width > widthSpecSize) {
                    // too wide, decrease both width and height
                    width = widthSpecSize;
                    height = width * mVideoHeight / mVideoWidth;
                }
            }
        } else {
            // no size yet, just adopt the given spec sizes
        }
        setMeasuredDimension(width, height);
    }

    @Override
    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
        super.onInitializeAccessibilityEvent(event);
        event.setClassName(FixedTextureVideoView.class.getName());
    }

    @Override
    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
        super.onInitializeAccessibilityNodeInfo(info);
        info.setClassName(FixedTextureVideoView.class.getName());
    }

    public int resolveAdjustedSize(int desiredSize, int measureSpec) {
        return getDefaultSize(desiredSize, measureSpec);
    }

    private void initVideoView() {
        mVideoWidth = 0;
        mVideoHeight = 0;
        setSurfaceTextureListener(mSurfaceTextureListener);
        setFocusable(true);
        setFocusableInTouchMode(true);
        requestFocus();
        mCurrentState = STATE_IDLE;
        mTargetState  = STATE_IDLE;
    }

    /**
     * Sets video path.
     *
     * @param path the path of the video.
     */
    public void setVideoPath(String path) {
        setVideoURI(Uri.parse(path));
    }

    /**
     * Sets video URI.
     *
     * @param uri the URI of the video.
     */
    public void setVideoURI(Uri uri) {
        setVideoURI(uri, null);
    }

    /**
     * Sets video URI using specific headers.
     *
     * @param uri     the URI of the video.
     * @param headers the headers for the URI request.
     *                Note that the cross domain redirection is allowed by default, but that can be
     *                changed with key/value pairs through the headers parameter with
     *                "android-allow-cross-domain-redirect" as the key and "0" or "1" as the value
     *                to disallow or allow cross domain redirection.
     */
    public void setVideoURI(Uri uri, Map headers) {
        mUri = uri;
        mHeaders = headers;
        mSeekWhenPrepared = 0;
        openVideo();
        requestLayout();
        invalidate();
    }

    public void stopPlayback() {
        if (mMediaPlayer != null) {
            mMediaPlayer.stop();
            mMediaPlayer.release();
            mMediaPlayer = null;
            mCurrentState = STATE_IDLE;
            mTargetState  = STATE_IDLE;
            AudioManager am = (AudioManager) getContext().getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
            am.abandonAudioFocus(null);
        }
    }

    private void openVideo() {
        if (mUri == null || mSurface == null) {
            // not ready for playback just yet, will try again later
            return;
        }
        // we shouldn't clear the target state, because somebody might have
        // called start() previously
        release(false);

        AudioManager am = (AudioManager) getContext().getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
        am.requestAudioFocus(null, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);

        try {
            mMediaPlayer = new MediaPlayer();

            if (mAudioSession != 0) {
                mMediaPlayer.setAudioSessionId(mAudioSession);
            } else {
                mAudioSession = mMediaPlayer.getAudioSessionId();
            }
            mMediaPlayer.setOnPreparedListener(mPreparedListener);
            mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
            mMediaPlayer.setOnCompletionListener(mCompletionListener);
            mMediaPlayer.setOnErrorListener(mErrorListener);
            mMediaPlayer.setOnInfoListener(mInfoListener);
            mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
            mCurrentBufferPercentage = 0;
            mMediaPlayer.setDataSource(getContext().getApplicationContext(), mUri, mHeaders);
            mMediaPlayer.setSurface(mSurface);
            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            if (isMute){
                mMediaPlayer.setVolume(0f, 0f);
            }
            mMediaPlayer.setScreenOnWhilePlaying(true);
            mMediaPlayer.prepareAsync();

            // we don't set the target state here either, but preserve the
            // target state that was there before.
            mCurrentState = STATE_PREPARING;
            attachMediaController();
        } catch (IOException ex) {
            Log.w(TAG, "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.w(TAG, "Unable to open content: " + mUri, ex);
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;
            mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
            return;
        }
    }
    //设置是否静音
    public void setMute(boolean isMute) {
        this.isMute = isMute;
    }

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

    private void attachMediaController() {
        if (mMediaPlayer != null && mMediaController != null) {
            mMediaController.setMediaPlayer(this);
            View anchorView = this.getParent() instanceof View ?
                    (View)this.getParent() : this;
            mMediaController.setAnchorView(anchorView);
            mMediaController.setEnabled(isInPlaybackState());
        }
    }

    //需求:视频等比例放大,直至一边铺满View的某一边,另一边超出View的另一边,再移动到View的正中央,这样长边两边会被裁剪掉同样大小的区域,视频看起来不会变形
    //也即是:先把视频区(实际的大小显示区)与View(定义的大小)区的两个中心点重合, 然后等比例放大或缩小视频区,直至一条边与View的一条边相等,另一条边超过
    //View的另一条边,这时再裁剪掉超出的边, 使视频区与View区大小一样. 这样在不同尺寸的手机上,视频看起来不会变形,只是水平或竖直方向的两端被裁剪了一些.
    private void transformVideo(int videoWidth, int videoHeight) {
        if (getResizedHeight() == 0 || getResizedWidth() == 0) {
            Log.d(TAG, "transformVideo, getResizedHeight=" + getResizedHeight() + "," + "getResizedWidth=" + getResizedWidth());
            return;
        }
        float sx = (float) getResizedWidth() / (float) videoWidth;
        float sy = (float) getResizedHeight() / (float) videoHeight;
        Log.d(TAG, "transformVideo, sx=" + sx);
        Log.d(TAG, "transformVideo, sy=" + sy);

        float maxScale = Math.max(sx, sy);
        if (this.matrix == null) {
            matrix = new Matrix();
        } else {
            matrix.reset();
        }

        //第2步:把视频区移动到View区,使两者中心点重合.
        matrix.preTranslate((getResizedWidth() - videoWidth) / 2, (getResizedHeight() - videoHeight) / 2);

        //第1步:因为默认视频是fitXY的形式显示的,所以首先要缩放还原回来.
        matrix.preScale(videoWidth / (float) getResizedWidth(), videoHeight / (float) getResizedHeight());

        //第3步,等比例放大或缩小,直到视频区的一边超过View一边, 另一边与View的另一边相等. 因为超过的部分超出了View的范围,所以是不会显示的,相当于裁剪了.
        matrix.postScale(maxScale, maxScale, getResizedWidth() / 2, getResizedHeight() / 2);//后两个参数坐标是以整个View的坐标系以参考的

        Log.d(TAG, "transformVideo, maxScale=" + maxScale);

        setTransform(matrix);
        postInvalidate();
        Log.d(TAG, "transformVideo, videoWidth=" + videoWidth + "," + "videoHeight=" + videoHeight);
    }

    public int getResizedWidth() {
        if (fixedWidth == 0) {
            return getWidth();
        } else {
            return fixedWidth;
        }
    }

    public int getResizedHeight() {
        if (fixedHeight== 0) {
            return getHeight();
        } else {
            return fixedHeight;
        }
    }

    MediaPlayer.OnVideoSizeChangedListener mSizeChangedListener =
            new MediaPlayer.OnVideoSizeChangedListener() {
                public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
                    mVideoWidth = mp.getVideoWidth();
                    mVideoHeight = mp.getVideoHeight();
                    if (mVideoWidth != 0 && mVideoHeight != 0) {
                        getSurfaceTexture().setDefaultBufferSize(mVideoWidth, mVideoHeight);
                        requestLayout();
                        transformVideo(mVideoWidth, mVideoHeight);
                        Log.d(TAG, String.format("OnVideoSizeChangedListener, mVideoWidth=%d,mVideoHeight=%d", mVideoWidth, mVideoHeight));
                    }
                }
            };


    MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
        public void onPrepared(MediaPlayer mp) {
            mCurrentState = STATE_PREPARED;

            mCanPause = mCanSeekBack = mCanSeekForward = true;

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

            int seekToPosition = mSeekWhenPrepared;  // mSeekWhenPrepared may be changed after seekTo() call
            if (seekToPosition != 0) {
                seekTo(seekToPosition);
            }
            if (mVideoWidth != 0 && mVideoHeight != 0) {
                //Log.i("@@@@", "video size: " + mVideoWidth +"/"+ mVideoHeight);
                getSurfaceTexture().setDefaultBufferSize(mVideoWidth, mVideoHeight);
                // We won't get a "surface changed" callback if the surface is already the right size, so
                // start the video here instead of in the callback.
                if (mTargetState == STATE_PLAYING) {
                    start();
                    if (mMediaController != null) {
                        mMediaController.show();
                    }
                } else if (!isPlaying() &&
                        (seekToPosition != 0 || getCurrentPosition() > 0)) {
                    if (mMediaController != null) {
                        // Show the media controls when we're paused into a video and make 'em stick.
                        mMediaController.show(0);
                    }
                }
            } else {
                // We don't know the video size yet, but should start anyway.
                // The video size might be reported to us later.
                if (mTargetState == STATE_PLAYING) {
                    start();
                }
            }
        }
    };

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

    private MediaPlayer.OnInfoListener mInfoListener =
            new MediaPlayer.OnInfoListener() {
                public  boolean onInfo(MediaPlayer mp, int arg1, int arg2) {
                    if (mOnInfoListener != null) {
                        mOnInfoListener.onInfo(mp, arg1, arg2);
                    }
                    return true;
                }
            };

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

                    /* If an error handler has been supplied, use it and finish. */
                    if (mOnErrorListener != null) {
                        if (mOnErrorListener.onError(mMediaPlayer, framework_err, impl_err)) {
                            return true;
                        }
                    }

                    /* Otherwise, pop up an error dialog so the user knows that
                     * something bad has happened. Only try and pop up the dialog
                     * if we're attached to a window. When we're going away and no
                     * longer have a window, don't bother showing the user an error.
                     */
                    if (getWindowToken() != null) {
                        Resources r = getContext().getResources();
                        int messageId;

                        if (framework_err == MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK) {
                            messageId = android.R.string.VideoView_error_text_invalid_progressive_playback;
                        } else {
                            messageId = android.R.string.VideoView_error_text_unknown;
                        }

                        new AlertDialog.Builder(getContext())
                                .setMessage(messageId)
                                .setPositiveButton(android.R.string.VideoView_error_button,
                                        new DialogInterface.OnClickListener() {
                                            public void onClick(DialogInterface dialog, int whichButton) {
                                                /* If we get here, there is no onError listener, so
                                                 * at least inform them that the video is over.
                                                 */
                                                if (mOnCompletionListener != null) {
                                                    mOnCompletionListener.onCompletion(mMediaPlayer);
                                                }
                                            }
                                        })
                                .setCancelable(false)
                                .show();
                    }
                    return true;
                }
            };

    private MediaPlayer.OnBufferingUpdateListener mBufferingUpdateListener =
            new MediaPlayer.OnBufferingUpdateListener() {
                public void onBufferingUpdate(MediaPlayer mp, int percent) {
                    mCurrentBufferPercentage = percent;
                }
            };

    /**
     * Register a callback to be invoked when the media file
     * is loaded and ready to go.
     *
     * @param l The callback that will be run
     */
    public void setOnPreparedListener(MediaPlayer.OnPreparedListener l)
    {
        mOnPreparedListener = l;
    }

    /**
     * Register a callback to be invoked when the end of a media file
     * has been reached during playback.
     *
     * @param l The callback that will be run
     */
    public void setOnCompletionListener(MediaPlayer.OnCompletionListener l)
    {
        mOnCompletionListener = l;
    }

    /**
     * Register a callback to be invoked when an error occurs
     * during playback or setup.  If no listener is specified,
     * or if the listener returned false, TextureVideoView will inform
     * the user of any errors.
     *
     * @param l The callback that will be run
     */
    public void setOnErrorListener(MediaPlayer.OnErrorListener l)
    {
        mOnErrorListener = l;
    }

    /**
     * Register a callback to be invoked when an informational event
     * occurs during playback or setup.
     *
     * @param l The callback that will be run
     */
    public void setOnInfoListener(MediaPlayer.OnInfoListener l) {
        mOnInfoListener = l;
    }

    SurfaceTextureListener mSurfaceTextureListener = new SurfaceTextureListener()
    {
        @Override
        public void onSurfaceTextureSizeChanged(final SurfaceTexture surface, final int width, final int height) {
            boolean isValidState =  (mTargetState == STATE_PLAYING);
            boolean hasValidSize = (width > 0 && height > 0);
            if (mMediaPlayer != null && isValidState && hasValidSize) {
                if (mSeekWhenPrepared != 0) {
                    seekTo(mSeekWhenPrepared);
                }
                start();
            }
        }

        @Override
        public void onSurfaceTextureAvailable(final SurfaceTexture surface, final int width, final int height) {
            mSurface = new Surface(surface);
            openVideo();
        }

        @Override
        public boolean onSurfaceTextureDestroyed(final SurfaceTexture surface) {
            // after we return from this we can't use the surface any more
            if (mSurface != null) {
                mSurface.release();
                mSurface = null;
            }
            if (mMediaController != null) mMediaController.hide();
            release(true);
            return true;
        }
        @Override
        public void onSurfaceTextureUpdated(final SurfaceTexture surface) {
            // do nothing
        }
    };

    /*
     * release the media player in any state
     */
    private void release(boolean cleartargetstate) {
        if (mMediaPlayer != null) {
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
            mCurrentState = STATE_IDLE;
            if (cleartargetstate) {
                mTargetState  = STATE_IDLE;
            }
            AudioManager am = (AudioManager) getContext().getApplicationContext().getSystemService(Context.AUDIO_SERVICE);
            am.abandonAudioFocus(null);
            VideoView a;
        }
    }

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

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

    @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_VOLUME_MUTE &&
                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) {
                if (mMediaPlayer.isPlaying()) {
                    pause();
                    mMediaController.show();
                } else {
                    start();
                    mMediaController.hide();
                }
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY) {
                if (!mMediaPlayer.isPlaying()) {
                    start();
                    mMediaController.hide();
                }
                return true;
            } else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP
                    || keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE) {
                if (mMediaPlayer.isPlaying()) {
                    pause();
                    mMediaController.show();
                }
                return true;
            } 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() {
        release(false);
    }

    public void resume() {
        openVideo();
    }

    @Override
    public int getDuration() {
        if (isInPlaybackState()) {
            return mMediaPlayer.getDuration();
        }

        return -1;
    }

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

    @Override
    public void seekTo(int 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;
    }

    private boolean isInPlaybackState() {
        return (mMediaPlayer != null &&
                mCurrentState != STATE_ERROR &&
                mCurrentState != STATE_IDLE &&
                mCurrentState != STATE_PREPARING);
    }

    @Override
    public boolean canPause() {
        return mCanPause;
    }

    @Override
    public boolean canSeekBackward() {
        return mCanSeekBack;
    }

    @Override
    public boolean canSeekForward() {
        return mCanSeekForward;
    }

    public int getAudioSessionId() {
        if (mAudioSession == 0) {
            MediaPlayer foo = new MediaPlayer();
            mAudioSession = foo.getAudioSessionId();
            foo.release();
        }
        return mAudioSession;
    }

}

二，用法

textvideo即为自定义的控件

播放视频

private void startVideoPlayer(){
        textvideo.setOnErrorListener(new MediaPlayer.OnErrorListener() {
            @Override
            public boolean onError(MediaPlayer mp, int what, int extra) {
                stopVideoPlayer();  //停止播放
                return false;
            }
        });
        textvideo.post(new Runnable() {
            @Override
            public void run() {
                textvideo.setFixedSize(textvideo.getWidth(), textvideo.getHeight());
                textvideo.invalidate();
            }
        });
        //设置视频静音
        textvideo.setMute(false);
        Uri parse = Uri.parse(videourl);
        textvideo.setVideoURI(parse);   //网络视频 setVideoURI  本地视频 setVideoPath
        textvideo.requestFocus();
        textvideo.start();

    }

停止播放

private void stopVideoPlayer(){
    if (textvideo.isPlaying() || textvideo.canPause()) {
        textvideo.stopPlayback();
        textvideo.suspend();
    }
}

再说两个方法

1.视频开始播放时走的方法，可以做一些自己的操作  例如隐藏 加载中的图标

textvideo.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
    @Override
    public void onPrepared(MediaPlayer mp) {
        videoPb.setVisibility(View.GONE);
        videoTx.setVisibility(View.GONE);
    }
});

2.视频结束播放时走的方法，可以选择自己的操作，重复播放，关闭页面等等

textvideo.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
    @Override
    public void onCompletion(MediaPlayer mp) {

//让其重复播放
        textvideo.seekTo(0);
        textvideo.start();
    }
});

总的来说就这些