Android播放视频之VideoView(2)

播放视频的话直接调用VideoView 的start()函数即可，seekTo（）函数修改从什么位置开始播放。

pasue（）暂停播放，getCurrentPosition（）获取播放到什么位置了 时间毫秒。

看一下控制播放进度消息的代码：

@Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.cover:
                Log.d(TAG,"click cover ");
                int currentPosition = videoView.getCurrentPosition();
                int duration = videoView.getDuration();
                Log.d(TAG,"currentPosition = "+currentPosition+"duration = "+duration);
                if(currentPosition>0){//说明已经播放了，不管现在是暂停还是播放中
                    if(playOrPause.getVisibility() == View.VISIBLE){
                        playOrPause.setVisibility(View.GONE);
                    }else {
                        playOrPause.setVisibility(View.VISIBLE);
                    }
                    if(progressLayout.getVisibility() == View.VISIBLE){
                        myHandler.removeCallbacks(runnable);
                        progressLayout.setVisibility(View.GONE);
                    }else {
                        progressLayout.setVisibility(View.VISIBLE);
                        currentTime.setText((currentPosition/1000)/60%60/10+""+(currentPosition/1000)/60%60+":"
                                +(currentPosition/1000)%60/10+""+(currentPosition/1000)%60);
                        sumTime.setText((duration/1000)/60%60/10+""+(duration/1000)/60%60+":"
                                +(duration/1000)%60/10+""+(duration/1000)%60);
                        progressBar.setMax(duration);
                        progressBar.setProgress(currentPosition);
                        new Thread(new Runnable() {
                            @Override
                            public void run() {
                                while(progressLayout.getVisibility()==View.VISIBLE){
                                    myHandler.sendEmptyMessage(0);
                                    try {
                                        Thread.sleep(1000);
                                    } catch (InterruptedException e) {
                                        e.printStackTrace();
                                    }
                                }
                            }
                        }).start();
                        myHandler.postDelayed(runnable,3000);
                    }
                }
                break;
            default:
                break;
        }
    }
    private Runnable runnable = new Runnable() {
        @Override
        public void run() {
            playOrPause.setVisibility(View.GONE);
            progressLayout.setVisibility(View.GONE);
        }
    };

下载该demo源码点击此处

接着看一下VideoView结合MediaController来播放视频，就简单几句代码就可以了：

  videoView = (MyVideoView) findViewById(R.id.video_view);
        videoView.setVideoURI(Uri.parse(PATH));
        MediaController mediaController = new MediaController(this);
        videoView.setMediaController(mediaController);

<framelayout android:id="@+id/activity_main" android:layout_height="match_parent" android:layout_width="match_parent" tools:context="cj.com.videoviewdemo3.MainActivity" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools">
    </framelayout>

可以直接控制视频的播放了。

这里来简单看一下VideoView的源码。

源码位置：frameworks/base/core/java/android/widget/VideoView.java

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

private void initVideoView() {
        mVideoWidth = 0;
        mVideoHeight = 0;
        getHolder().addCallback(mSHCallback);
        getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        setFocusable(true);
        setFocusableInTouchMode(true);
        requestFocus();
        mCurrentState = STATE_IDLE;
        mTargetState  = STATE_IDLE;
    }

  public void setVideoURI(Uri uri) {
        setVideoURI(uri, null);
    }

 public void setVideoURI(Uri uri, Map headers) {
        mUri = uri;
        mHeaders = headers;
        mSeekWhenPrepared = 0;
        openVideo();
        requestLayout();
        invalidate();
    },>

private void openVideo() {
        if (mUri == null || mSurfaceHolder == null) {
            // not ready for playback just yet, will try again later
            return;
        }
        // Tell the music playback service to pause
        // TODO: these constants need to be published somewhere in the framework.
        Intent i = new Intent("com.android.music.musicservicecommand");
        i.putExtra("command", "pause");
        mContext.sendBroadcast(i);
        // we shouldn't clear the target state, because somebody might have
        // called start() previously
        release(false);
        try {
            mMediaPlayer = new MediaPlayer();
            mMediaPlayer.setOnPreparedListener(mPreparedListener);
            mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
            mMediaPlayer.setOnCompletionListener(mCompletionListener);
            mMediaPlayer.setOnErrorListener(mErrorListener);
            mMediaPlayer.setOnInfoListener(mOnInfoListener);
            mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
            mCurrentBufferPercentage = 0;
            mMediaPlayer.setDataSource(mContext, mUri, mHeaders);
            mMediaPlayer.setDisplay(mSurfaceHolder);
            mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
            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;
        }
    }

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