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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 复制代码 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'" 复制代码 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){}; } 复制代码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; } 复制代码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; } 复制代码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(); } 复制代码 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"); } } 复制代码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 out.toByteArray(); } else { buf = new byte[size - out.size()]; } } return null; } /** * 删除file一部分字节, 从position到file.size */ private void deleteFileByPosition(long position) throws IOException{ FileInputStream in = new FileInputStream(localVideoFile); File tempFile = VideoLRUCacheUtil.createTempFile(MyApplication.mContext); FileOutputStream out = new FileOutputStream(tempFile); byte[] buf = new byte[8192]; int len; while ((len = in.read(buf)) != -1) { if(position <= len){ out.write(buf, 0, (int) position); out.close(); in.close(); localVideoFile.delete(); tempFile.renameTo(localVideoFile); localStream = new RandomAccessFile(localVideoFile, "rw"); return ; }else{ position -= len; out.write(buf, 0, len); } } tempFile.delete(); } 复制代码3.主要说一下syncInputStream(), 因为有可能出现一种情况, 比如一个视频长度100, 播放器首先读取视频的1到10之间的数据, 然后在读取90到100之间的数据, 然后在从1播放到100; 所以这时我们需要同步视频流, 和播放进度保持一致这时就需要重新开启一个IO流(如果在读取本地缓存时可以直接使用RandomAccessFile.seek()方法跳转)
//同步数据流 private boolean syncInputStream(long position) throws IOException{ boolean isWriteVideo = true; //判断两次读取数据是否连续 if(mPosition != position){ if(isCacheVideo){ //如果是本地缓存, 直接跳转到该索引 localStream.seek(position); }else{ if(mPosition > position){ //同步本地缓存流 localStream.close(); deleteFileByPosition(position); localStream.seek(position); }else{ isWriteVideo = false; } networkInPutStream.close(); //重新开启一个网络流 networkInPutStream = openHttpClient((int) position); } mPosition = position; } return isWriteVideo; } 复制代码4.最后一个是close()方法, 主要播放停止后释放一些资源
public void close() throws IOException { if(networkInPutStream != null){ networkInPutStream.close(); networkInPutStream = null; } if(localStream != null){ localStream.close(); localStream = null; } if(localVideoFile.length()!=contentLength){ localVideoFile.delete(); } } 复制代码 ④视频缓存和LRUCache管理1.首先创建缓存文件, 在刚才的MediaDataSource.getSize()方法里有一句代码
localVideoFile = VideoLRUCacheUtil.createCacheFile(MyApplication.mContext, mMd5, contentLength); public static File createCacheFile(Context context, String md5, long fileSize){ //创建一个视频缓存文件, 在data/data目录下 File filesDir = context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS); File cacheFile = new File(filesDir, md5); if(!cacheFile.exists()) { cacheFile.createNewFile(); } //将缓存信息存到数据库 VideoLRUCacheUtil.updateVideoCacheBean(md5, cacheFile.getAbsolutePath(), fileSize); return cacheFile; } 复制代码2.然后是读取缓存文件, 在刚才的MediaDataSource.getSize()方法里还有一句代码
//检查本地是否有缓存, 2步确认, 数据库中是否存在, 本地文件是否存在 private File checkCache(String md5){ //查询数据库 VideoCacheBean bean = VideoCacheDBUtil.query(md5); if(bean != null){ File file = new File(bean.getVideoPath()); if(file.exists()){ return file; } } return null; } 复制代码3.LRUCache的实现
//清理超过大小和存储时间的视频缓存文件 VideoLRUCacheUtil.checkCacheSize(mContext); public static void checkCacheSize(Context context){ ArrayList<VideoCacheBean> videoCacheList = VideoCacheDBUtil.query(); //检查一下数据库里面的缓存文件是否存在 for (VideoCacheBean bean : videoCacheList){ if(bean.getFileSize() == 0){ File videoFile = new File(bean.getVideoPath()); //如果文件不存在或者文件大小不匹配, 那么删除 if(!videoFile.exists() && videoFile.length()!=bean.getFileSize()){ VideoCacheDBUtil.delete(bean); } } } long currentSize = 0; long currentTime = System.currentTimeMillis(); for (VideoCacheBean bean : videoCacheList){ //太久远的文件删除 if(currentTime-bean.getPlayTime() > maxCacheTime){ VideoCacheDBUtil.delete(bean); }else { //大于存储空间的删除 if (currentSize + bean.getFileSize() > maxDirSize) { VideoCacheDBUtil.delete(bean); } else { currentSize += bean.getFileSize(); } } } //删除不符合规则的缓存 deleteDirRoom(context.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS), VideoCacheDBUtil.query()); } //更新缓存文件的播放次数和最后播放时间 public static void updateVideoCacheBean(String md5, String videoPath, long fileSize){ VideoCacheBean videoCacheBean = VideoCacheDBUtil.query(md5); if(videoCacheBean == null){ videoCacheBean = new VideoCacheBean(); videoCacheBean.setKey(md5); videoCacheBean.setVideoPath(videoPath); videoCacheBean.setFileSize(fileSize); } videoCacheBean.setPlayCount(videoCacheBean.getPlayCount()+1); videoCacheBean.setPlayTime(System.currentTimeMillis()); VideoCacheDBUtil.save(videoCacheBean); } 复制代码 ⑤关于多个Activity同步播放状态, 无缝切换1.首先在跳转时, 通知被覆盖的activity不关闭播放器
//首先跳转时通知一下activity mainActivity.jumpNotCloseMediaPlay(position); //然后在onPause里 protected void onPause() { super.onPause(); //如果要跳转播放, 那么不关闭播放器 if (videoPositionList.size()>currentPlayIndex && jumpVideoPosition==videoPositionList.get(currentPlayIndex)) { ...这里就不关闭播放器 }else{ //如果不要求跳转播放, 那么就重置播放器 mMediaPlayerTool.reset(); } } 复制代码2.然后在新页面初始化播放器
private void playVideoByPosition(int position){ ......一切初始化代码照旧(注意不要重置播放器), 这里省略不提 //把播放器当前绑定的SurfaceTexture取出起来, 设置给当前界面的TextureView vh.playTextureView.resetTextureView(mMediaPlayerTool.getAvailableSurfaceTexture()); mMediaPlayerTool.setPlayTextureView(vh.playTextureView); //最后刷新一下view vh.playTextureView.postInvalidate(); } 复制代码
