【Android 进阶】仿抖音系列之列表播放视频(二)

上一篇中,我们实现了仿抖音上下翻页切换视频的效果,详见【Android 进阶】仿抖音系列之翻页上下滑切换视频(一),这一篇,我们来实现抖音列表播放视频。

之前也在github上找到一个demo,这是链接,原理和我的一样,只是用起来比较麻烦。。。

先说下原理,这里用到了RecyclerView的onScrolled和onScrollStateChanged 监听,在onScrolled中判断当前可见的position,结合onScrollStateChanged中返回的当前RecyclerView的滑动状态,当是拖动和停止滚动时,可以播放;当是惯性滑动时,暂停播放。

关于RecyclerView3种滑动状态,RecyclerView.SCROLL_STATE_IDLE,RecyclerView.SCROLL_STATE_DRAGGING,RecyclerView.SCROLL_STATE_SETTLING,大家可以自行百度,这里不做过多的描述了。

rvList.addOnScrollListener(new RecyclerView.OnScrollListener() {
            @Override
            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
                firstVisibleItem = layoutManager.findFirstVisibleItemPosition();
                lastVisibleItem = layoutManager.findLastVisibleItemPosition();

            }

            @Override
            public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
                switch (newState) {
                    case RecyclerView.SCROLL_STATE_IDLE://停止滚动
                        /**在这里执行,视频的自动播放与停止*/
                        autoPlayVideo(recyclerView);
                        break;
                    case RecyclerView.SCROLL_STATE_DRAGGING://拖动
                        autoPlayVideo(recyclerView);
                        break;
                    case RecyclerView.SCROLL_STATE_SETTLING://惯性滑动
                        JZVideoPlayer.releaseAllVideos();
                        break;
                }

            }
        });

布局就是一个RecyclerView,就不贴了,下面是Adapter

         urlList = new ArrayList<>();
        urlList.add("http://image.38.hn/public/attachment/201805/100651/201805181532123423.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803151735198462.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150923220770.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150922255785.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803150920130302.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803141625005241.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803141624378522.mp4");
        urlList.add("http://image.38.hn/public/attachment/201803/100651/201803131546119319.mp4");

        videoAdapter = new ListVideoAdapter(urlList);
        rvList.setLayoutManager(new LinearLayoutManager(ListActivity.this));
        rvList.setAdapter(videoAdapter);

Adapter这里自己做了个封装,可以用原生或者其他封装比较好的,这里就不贴了

  class ListVideoAdapter extends BaseRecAdapter {


        public ListVideoAdapter(List list) {
            super(list);
        }

        @Override
        public void onHolder(VideoViewHolder holder, String bean, int position) {
            holder.mp_video.setUp(bean, JZVideoPlayerStandard.CURRENT_STATE_NORMAL);
            if (position == 0) {
                holder.mp_video.startVideo();
            }
            Glide.with(context).load(bean).into(holder.mp_video.thumbImageView);
            holder.tv_title.setText("第" + position + "个视频");
        }

        @Override
        public VideoViewHolder onCreateHolder() {
            return new VideoViewHolder(getViewByRes(R.layout.item_video));

        }


    }

    public class VideoViewHolder extends BaseRecViewHolder {
        public View rootView;
        public MyVideoPlayer mp_video;
        public TextView tv_title;

        public VideoViewHolder(View rootView) {
            super(rootView);
            this.rootView = rootView;
            this.mp_video = rootView.findViewById(R.id.mp_video);
            this.tv_title = rootView.findViewById(R.id.tv_title);
        }

    }

布局如下



    

    


这里使用的是 JiaoZiVideoPlayer,其中MyVideoPlayer 是之前公司项目需要,对其做的个性化定制,这里下面再说。

下来就是本篇的核心,通过判断可见项,暂停/播放视频,代码如下

/**
     * 自动播放
     */
    private void autoPlayVideo(RecyclerView recyclerView) {

        if (firstVisibleItem == 0 && lastVisibleItem == 0 && recyclerView.getChildAt(0) != null) {

            MyVideoPlayer videoView = null;
            if (recyclerView != null && recyclerView.getChildAt(0) != null) {
                videoView = recyclerView.getChildAt(0).findViewById(R.id.mp_video);
            }
            if (videoView != null) {
                if (videoView.currentState == JZVideoPlayer.CURRENT_STATE_NORMAL || videoView.currentState == JZVideoPlayer.CURRENT_STATE_PAUSE) {
                    videoView.startVideo();
                }
            }
        }

        for (int i = 0; i <= lastVisibleItem; i++) {
            if (recyclerView == null || recyclerView.getChildAt(i) == null) {
                return;
            }
            MyVideoPlayer
                    videoView = recyclerView.getChildAt(i).findViewById(R.id.mp_video);
            if (videoView != null) {

                Rect rect = new Rect();
                //获取视图本身的可见坐标,把值传入到rect对象中
                videoView.getLocalVisibleRect(rect);
                //获取视频的高度
                int videoHeight = videoView.getHeight();

                if (rect.top <= 100 && rect.bottom >= videoHeight) {
                    if (videoView.currentState == JZVideoPlayer.CURRENT_STATE_NORMAL || videoView.currentState == JZVideoPlayer.CURRENT_STATE_PAUSE) {
                        videoView.startVideo();
                    }
                    return;
                }

                JZVideoPlayer.releaseAllVideos();

            } else {
                JZVideoPlayer.releaseAllVideos();
            }

        }

    }

顺便说一下,为啥用JiaoZiVideoPlayer,就是因为 JZVideoPlayer.releaseAllVideos();,一句代码就可以暂停所有的播放器,否则自己要实现这个还是比较麻烦的

到这里,大概功能已经实现了,下面说说定制化的功能。需要去掉原播放器的进度条、按钮,点击视频,全屏播放,再次点击取消全屏。

我的做法是添加一个透明度为0的布局,覆盖在播放器上,这样实际上点击的是我们添加的布局

这里有个小技巧,可以粘贴源码中的布局,重要的事情说三遍,不要修改文件名、不要修改文件名、不要修改文件名,找到相关布局,设置android:visibility="gone",这样我们的项目中的布局就会替换掉原来的布局。

完整代码如下

jz_layout_standard.xml




    

    

    

    

        

            

            

            

            

            
        
    

    

    

    

        

            


            

            

                

                
            

        
    

    

    

        

            
        

        


        

            

            
        
    

    

    

        
    




还需要实现循环播放,这个比较简单,重写onAutoCompletion方法,当其播放完成时,继续播放即可。

 @Override
    public void onAutoCompletion() {

        thumbImageView.setVisibility(View.GONE);

        if (currentScreen == SCREEN_WINDOW_FULLSCREEN) {
            onStateAutoComplete();
            setUp((String) getCurrentUrl(), JZVideoPlayer.SCREEN_WINDOW_FULLSCREEN);
        } else {
            super.onAutoCompletion();
            setUp((String) getCurrentUrl(), JZVideoPlayer.CURRENT_STATE_NORMAL);
        }
        //循环播放

        startVideo();
    }

到这里,列表播放这个功能已经完成了。

最后,献上完整代码。Github

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