VideoPlayerDemo

v1.1 增加本地视频播放功能, 视频会自动初始化宽高 不用手动传视频宽高了

源码下载 演示Demo下载

本项目使用播放器是ijkplay, 并且进行封装和修改

主要功能:
1.重新编辑ijkplay的so库, 使其更精简和支持https协议
2.自定义MediaDataSource, 使用okhttp重写网络框架, 网络播放更流畅
3.实现视频缓存, 并且自定义LRUCache算法管理缓存文件
4.全局使用一个播放器, 实现视频在多个Activity之前无缝切换, 流畅播放
5.加入更多兼容性判断, 适配绝大数机型

---

①导入ijkplay:

//需要的权限
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

首先将lib文件夹下的so库粘贴过来, (因为官方自带的so库是不支持https的, 我重新编译的这个so库支持https协议, 
并且使用的是精简版的配置, 网上关于ijkplay编译的流程和配置挺多的, 可以根据自己的需求自定义)

然后在module的build中加入 "implementation 'tv.danmaku.ijk.media:ijkplayer-java:0.8.8'"

②使用播放器的方法:

1.我封装了一个MediaPlayerTool工具类包含的初始化so库和一些回调等等

//通过单例得到媒体播放工具
mMediaPlayerTool = MediaPlayerTool.getInstance();
//这里会自动初始化so库 有些手机会找不到so, 会自动使用系统的播放器
private MediaPlayerTool(){
       try {
           IjkMediaPlayer.loadLibrariesOnce(null);
           IjkMediaPlayer.native_profileBegin("libijkplayer.so");
           loadIjkSucc = true;
       }catch (UnsatisfiedLinkError e){
           e.printStackTrace();
           loadIjkSucc = false;
       }
}
   
//一些生命周期回调
public static abstract class VideoListener {
       //视频开始播放
       public void onStart(){};
       //视频被停止播放
       public void onStop(){};
       //视频播放完成
       public void onCompletion(){};
       //视频旋转角度参数初始化完成
       public void onRotationInfo(int rotation){};
       //播放进度 0-1
       public void onPlayProgress(long currentPosition){};
       //缓存速度 1-100
       public void onBufferProgress(int progress){};
   }

2.因为我使用的是RecyclerView,所以先找到当前屏幕中 处于可以播放范围的item

    //首先循环RecyclerView中所有itemView, 找到在屏幕可见范围内的item
    private void checkPlayVideo(){
        currentPlayIndex = 0;
        videoPositionList.clear();

        int childCount = rv_video.getChildCount();
        for (int x = 0; x < childCount; x++) {
            View childView = rv_video.getChildAt(x);
            //isPlayRange()这个方法很重要
            boolean playRange = isPlayRange(childView.findViewById(R.id.rl_video), rv_video);
            if(playRange){
                int position = rv_video.getChildAdapterPosition(childView);
                if(position>=0 && !videoPositionList.contains(position)){
                    videoPositionList.add(position);
                }
            }
        }
    }
    
    //检查当前item是否在RecyclerView可见的范围内
    private boolean isPlayRange(View childView, View parentView){

        if(childView==null || parentView==null){
            return false;
        }

        int[] childLocal = new int[2];
        childView.getLocationOnScreen(childLocal);

        int[] parentLocal = new int[2];
        parentView.getLocationOnScreen(parentLocal);

        boolean playRange = childLocal[1]>=parentLocal[1] &&
                childLocal[1]<=parentLocal[1]+parentView.getHeight()-childView.getHeight();

        return playRange;
    }

3.我还封装了一个TextureView, 里面包含一些初始化SurfaceTexture和视频裁剪播放的方法

    //视频居中播放
    private void setVideoCenter(float viewWidth, float viewHeight, float videoWidth, float videoHeight){

        Matrix matrix = new Matrix();
        float sx = viewWidth/videoWidth;
        float sy = viewHeight/videoHeight;
        float maxScale = Math.max(sx, sy);

        matrix.preTranslate((viewWidth - videoWidth) / 2, (viewHeight - videoHeight) / 2);
        matrix.preScale(videoWidth/viewWidth, videoHeight/viewHeight);
        matrix.postScale(maxScale, maxScale, viewWidth/2, viewHeight/2);

        mTextureView.setTransform(matrix);
        mTextureView.postInvalidate();
    }

    //初始化SurfaceTexture
    public SurfaceTexture newSurfaceTexture(){

        int[] textures = new int[1];
        GLES20.glGenTextures(1, textures, 0);
        int texName = textures[0];
        SurfaceTexture surfaceTexture = new SurfaceTexture(texName);
        surfaceTexture.detachFromGLContext();
        return surfaceTexture;
    }

4.接下来就是播放代码了

private void playVideoByPosition(int position){
       //根据传进来的position找到对应的ViewHolder
       final MainAdapter.MyViewHolder vh = (MainAdapter.MyViewHolder)       
       rv_video.findViewHolderForAdapterPosition(position);
       if(vh == null){
           return ;
       }

       currentPlayView = vh.rl_video;

       //初始化一些播放状态, 如进度条,播放按钮,加载框等
       //显示正在加载的界面
       vh.iv_play_icon.setVisibility(View.GONE);
       vh.pb_video.setVisibility(View.VISIBLE);
       vh.iv_cover.setVisibility(View.VISIBLE);
       vh.tv_play_time.setText("");

       //初始化播放器
       mMediaPlayerTool.initMediaPLayer();
       mMediaPlayerTool.setVolume(0);

       //设置视频url
       String videoUrl = dataList.get(position).getVideoUrl();
       mMediaPlayerTool.setDataSource(videoUrl);

       myVideoListener = new MediaPlayerTool.VideoListener() {
           @Override
           public void onStart() {
               //将播放图标和封面隐藏
               vh.iv_play_icon.setVisibility(View.GONE);
               vh.pb_video.setVisibility(View.GONE);
               //防止闪屏
               vh.iv_cover.postDelayed(new Runnable() {
                   @Override
                   public void run() {
                       vh.iv_cover.setVisibility(View.GONE);
                   }
               }, 300);
           }
           @Override
           public void onStop() {
               //播放停止
               vh.pb_video.setVisibility(View.GONE);
               vh.iv_cover.setVisibility(View.VISIBLE);
               vh.iv_play_icon.setVisibility(View.VISIBLE);
               vh.tv_play_time.setText("");
               currentPlayView = null;
           }
           @Override
           public void onCompletion() {
               //播放下一个
               currentPlayIndex++;
               playVideoByPosition(-1);
           }
           @Override
           public void onRotationInfo(int rotation) {
               //设置旋转播放
               vh.playTextureView.setRotation(rotation);
           }
           @Override
           public void onPlayProgress(long currentPosition) {
               //显示播放时长
               String date = MyUtil.fromMMss(mMediaPlayerTool.getDuration() - currentPosition);
               vh.tv_play_time.setText(date);
           }
       };
       mMediaPlayerTool.setVideoListener(myVideoListener);

       //这里重置一下TextureView
       vh.playTextureView.resetTextureView();
       mMediaPlayerTool.setPlayTextureView(vh.playTextureView);
       mMediaPlayerTool.setSurfaceTexture(vh.playTextureView.getSurfaceTexture());
       //准备播放
       mMediaPlayerTool.prepare();
   }

③重写MediaDataSource, 使用okhttp实现边下边播和视频缓存

1.一共需要重写3个方法getSize(),close()和readAt(); 先说getSize()

    public long getSize() throws IOException {
        //开始播放时, 播放器会调用一下getSize()来初始化视频大小, 这时我们就要初始化一条视频播放流
        if(networkInPutStream == null) {
            initInputStream();
        }
        return contentLength;
    }

    //初始化一个视频流出来, 可能是本地或网络
    private void initInputStream() throws IOException{

        File file = checkCache(mMd5);
        if(file != null){
            //更新一下缓存文件
            VideoLRUCacheUtil.updateVideoCacheBean(mMd5, file.getAbsolutePath(), file.length());
            //读取的本地缓存文件
            isCacheVideo = true;
            localVideoFile = file;
            //开启一个本地视频流
            localStream = new RandomAccessFile(localVideoFile, "rw");
            contentLength = file.length();
        }else {
            //没有缓存 开启一个网络流, 并且开启一个缓存流, 实现视频缓存
            isCacheVideo = false;
            //开启一个网络视频流
            networkInPutStream = openHttpClient(0);
            //要写入的本地缓存文件
            localVideoFile = VideoLRUCacheUtil.createCacheFile(MyApplication.mContext, mMd5, contentLength);
            //要写入的本地缓存视频流
            localStream = new RandomAccessFile(localVideoFile, "rw");
        }
    }

2.然后是readAt()方法, 也是最重要的一个方法

    /**
     * @param position 视频流读取进度
     * @param buffer 要把读取到的数据存到这个数组
     * @param offset 数据开始写入的坐标
     * @param size 本次一共读取数据的大小
     * @throws IOException
     */
    //记录当前读取流的索引
    long mPosition = 0;
    @Override
    public int readAt(long position, byte[] buffer, int offset, int size) throws IOException {

        if(position>=contentLength || localStream==null){
            return -1;
        }

        //是否将此字节缓存到本地
        boolean isWriteVideo = syncInputStream(position);

        //读取的流的长度不能大于contentLength
        if (position+size > contentLength) {
            size -= position+size-contentLength;
        }

        //读取指定大小的视频数据
        byte[] bytes;
        if(isCacheVideo){
            //从本地读取
            bytes = readByteBySize(localStream, size);
        }else{
            //从网络读取
            bytes = readByteBySize(networkInPutStream, size);
        }
        if(bytes != null) {
            //写入到播放器的数组中
            System.arraycopy(bytes, 0, buffer, offset, size);
            if (isWriteVideo && !isCacheVideo) {
                //将视频缓存到本地
                localStream.write(bytes);
            }
            //记录数据流读取到哪步了
            mPosition += size;
        }

        return size;
    }

     /**
     * 从inputStream里读取size大小的数据
     */
    private byte[] readByteBySize(InputStream inputStream, int size) throws IOException{

        ByteArrayOutputStream out = new ByteArrayOutputStream();

        byte[] buf = new byte[size];
        int len;
        while ((len = inputStream.read(buf)) != -1) {
            out.write(buf, 0, len);
            if (out.size() == size) {
                return ou