增加RecycleView 滑动监听，实现自动播放可见区域内的第一个视频Item

app/src/main/java/cn/jzvd/demo/ActivityListViewRecyclerView.java

@@ -1,5 +1,6 @@
 package cn.jzvd.demo;
 
+import android.graphics.Rect;
 import android.os.Bundle;
 import android.support.annotation.Nullable;
 import android.support.v7.app.AppCompatActivity;
@@ -13,6 +14,7 @@
 import cn.jzvd.JZUtils;
 import cn.jzvd.JZVideoPlayer;
 import cn.jzvd.JZVideoPlayerManager;
+import cn.jzvd.JZVideoPlayerStandard;
 
 /**
  * Created by yujunkui on 16/8/29.
@@ -52,6 +54,7 @@ public void onChildViewDetachedFromWindow(View view) {
                 }
             }
         });
+        recyclerView.addOnScrollListener(new FeedScrollListener());
     }
 
     @Override
@@ -78,4 +81,123 @@ public boolean onOptionsItemSelected(MenuItem item) {
         return super.onOptionsItemSelected(item);
     }
 
+    /**
+     * 监听recycleView滑动状态，
+     * 自动播放可见区域内的视频
+     */
+    private static class FeedScrollListener extends RecyclerView.OnScrollListener {
+
+        private int firstVisibleItem = 0;
+        private int lastVisibleItem = 0;
+        private int visibleCount = 0;
+
+        /**
+         * 视频状态标签
+         */
+        private enum VideoTagEnum {
+
+            /**
+             * 自动播放视频
+             */
+            TAG_AUTO_PLAY_VIDEO,
+
+            /**
+             * 暂停视频
+             */
+            TAG_PAUSE_VIDEO
+        }
+
+
+
+        @Override
+        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
+            super.onScrollStateChanged(recyclerView, newState);
+
+            // TODO 这可以加上 wifi 下自动播放视频开关
+//            if (wifiTag) {
+                switch (newState) {
+                    case RecyclerView.SCROLL_STATE_IDLE:
+                        autoPlayVideo(recyclerView, VideoTagEnum.TAG_AUTO_PLAY_VIDEO);
+                    default:
+                        autoPlayVideo(recyclerView, VideoTagEnum.TAG_PAUSE_VIDEO);
+                        break;
+                }
+//            } else {
+//                JZVideoPlayer.releaseAllVideos();
+//            }
+        }
+
+        @Override
+        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
+            super.onScrolled(recyclerView, dx, dy);
+
+            RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
+
+            if (layoutManager instanceof LinearLayoutManager) {
+
+                LinearLayoutManager linearManager = (LinearLayoutManager) layoutManager;
+
+                firstVisibleItem = linearManager.findFirstVisibleItemPosition();
+                lastVisibleItem = linearManager.findLastVisibleItemPosition();
+                visibleCount = lastVisibleItem - firstVisibleItem
+                //TODO  + headerView 的个数 ?
+                ;
+            }
+
+        }
+
+        /**
+         * 循环遍历 可见区域的播放器
+         * 然后通过 getLocalVisibleRect(rect)方法计算出哪个播放器完全显示出来
+         * <p>
+         * getLocalVisibleRect相关链接：http://www.cnblogs.com/ai-developers/p/4413585.html
+         *
+         * @param view
+         * @param handleVideoTag 视频需要进行状态
+         */
+        private void autoPlayVideo(RecyclerView view, VideoTagEnum handleVideoTag) {
+            for (int i = 0; i < visibleCount; i++) {
+                if (view != null && view.getChildAt(i) != null && view.getChildAt(i).findViewById(R.id.videoplayer) != null) {
+                    JZVideoPlayerStandard homeGSYVideoPlayer = (JZVideoPlayerStandard) view.getChildAt(i).findViewById(R.id.videoplayer);
+
+                    Rect rect = new Rect();
+                    homeGSYVideoPlayer.getLocalVisibleRect(rect);
+                    int videoheight = homeGSYVideoPlayer.getHeight();
+                    if (rect.top == 0 && rect.bottom == videoheight) {
+                        handleVideo(handleVideoTag, homeGSYVideoPlayer);
+                        // 借助跳出循环，达到只处理可见区域内的第一个播放器
+                        break ;
+                    }
+                }
+            }
+
+        }
+
+        /**
+         * 视频状态处理
+         * @param handleVideoTag 视频需要进行状态
+         * @param homeGSYVideoPlayer JZVideoPlayer播放器
+         */
+        private void handleVideo(VideoTagEnum handleVideoTag, JZVideoPlayerStandard homeGSYVideoPlayer) {
+            switch (handleVideoTag) {
+                case TAG_AUTO_PLAY_VIDEO:
+                    if ((homeGSYVideoPlayer.currentState != JZVideoPlayerStandard.CURRENT_STATE_PLAYING)) {
+                        // 进行播放
+                        homeGSYVideoPlayer.startVideo();
+                    }
+                    break;
+                case TAG_PAUSE_VIDEO:
+                    if ((homeGSYVideoPlayer.currentState != JZVideoPlayerStandard.CURRENT_STATE_PAUSE)) {
+                        // 模拟点击播放Button,实现暂停视频
+                        homeGSYVideoPlayer.startButton.performClick();
+                    }
+                    break;
+                default:
+                    break;
+            }
+        }
+
+
+    }
+
 }