Android仿微博/QQ空间滑动自动播放视频功能

最新推荐文章于 2022-03-21 10:25:23 发布

转载最新推荐文章于 2022-03-21 10:25:23 发布 · 3.9k 阅读

文章标签：

#android #视频

本文介绍了一种在移动端应用中实现滑动自动播放视频的方法。通过监听ListView或RecyclerView的滚动状态，结合视频可见区域判断，实现了视频的自动播放与暂停功能。

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最近做项目用到了滑动自动播放，下面是原理大家借鉴一下：
这里写图片描述
关键代码
1.监听滚动事件
首先要给listview添加setOnScrollListener监听,注意这个监听在recyclerView上是addOnScrollListener，也就是说下面代码同时支持recyclerView。

public int firstVisible=0,visibleCount=0, totalCount=0;
 videoList.setOnScrollListener(new AbsListView.OnScrollListener() {
    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
      switch (scrollState) {

        case AbsListView.OnScrollListener.SCROLL_STATE_FLING:
          Log.e("videoTest", "SCROLL_STATE_FLING");
          break;

        case AbsListView.OnScrollListener.SCROLL_STATE_IDLE:
          Log.e("videoTest", "SCROLL_STATE_IDLE");
          autoPlayVideo(view);
          break;

        case AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL:
          Log.e("videoTest", "SCROLL_STATE_TOUCH_SCROLL");
          break;

        default:
          break;
      }
    }  
    @Override
    public void onScroll(AbsListView view, int firstVisibleItem,
               int visibleItemCount, int totalItemCount) {
      // firstVisibleItem  当前第一个可见的item
      // visibleItemCount  当前可见的item个数
      if (firstVisible == firstVisibleItem) {
        return;
      }
      firstVisible = firstVisibleItem;
      visibleCount = visibleItemCount;
      totalCount = totalItemCount;
    }
  });

监听里会有两个方法，我们用onScroll方法记录当前第一个可见Item，以及可见Item总数，用onScrollStateChanged来监听手滑动屏幕的整个过程。当onScrollStateChanged 中的scrollState字段值等于SCROLL_STATE_IDLE 时，代表本次滑动完毕并停止滚动。

**SCROLL_STATE_TOUCH_SCROLL 手指触屏拉动准备滚动，只触发一次
SCROLL_STATE_FLING 持续滚动开始，只触发一次
SCROLL_STATE_IDLE 整个滚动事件结束，只触发一次**

2.处理视频逻辑

void autoPlayVideo(AbsListView view){
  Log.e("videoTest", "firstVisiblePos = " + firstVisible + "visibleItemCount = " + visibleCount);
  for (int i = 0; i < visibleCount; i++) {
    if (view!=null&&view.getChildAt(i)!=null&&view.getChildAt(i).findViewById(R.id.videoplayer) != null) {
      JCVideoPlayerStandard videoPlayerStandard1 = (JCVideoPlayerStandard) view.getChildAt(i).findViewById(R.id.videoplayer);
      Rect rect = new Rect();
      videoPlayerStandard1.getLocalVisibleRect(rect);
      int videoheight3 = videoPlayerStandard1.getHeight();
      Log.e("videoTest","i="+i+"==="+"videoheight3:"+videoheight3+"==="+"rect.top:"+rect.top+"==="+"rect.bottom:"+rect.bottom);
      if (rect.top==0&&rect.bottom==videoheight3)
      {
        if (videoPlayerStandard1.currentState == JCVideoPlayer.CURRENT_STATE_NORMAL || videoPlayerStandard1.currentState == JCVideoPlayer.CURRENT_STATE_ERROR) {
          Log.e("videoTest", videoPlayerStandard1.currentState + "======================performClick======================");
          videoPlayerStandard1.startButton.performClick();
          VPApplication.instance.VideoPlaying=videoPlayerStandard1;
        }
        return;
      }

    }
  }
  Log.e("videoTest", "======================releaseAllVideos=====================");
  JCVideoPlayer.releaseAllVideos();
  VPApplication.instance.VideoPlaying=null;
}