Android仿新浪微博/QQ空间滑动自动播放视频功能

先来看看效果图

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????感兴趣的朋友可以自行百度另外两个参数的意思，没准对你的需求有帮助????。

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;
}

首先是根据总数循环判断 item 是否有视频，如果有再利用rect类获取视图在屏幕坐标中的可视区域。

小结

好了，基本核心代码就是以上的这些，是不是很简单呢？感兴趣的大家快快自己动手操作起来吧，希望这篇文章对大家能有所帮助，如果有疑问大家可以留言交流。