标签:java GapWorker logStackTrace android 播放 RecyclerView xxxxx
场景描述
- App 有两个tab,每一个都是Fragment,以FragmentA和FragmentB 代称.
- 切到FragmentA 视频播放(在RecyclerViewA 内部),然后切到FragmentB 视频暂停.
- 就在此刻,滑动FragmentB 的recyclerView B ,来自FragmentA的视频播放出声音,而且声音是下一条视频的声音。
这确实是一个非常奇怪的问题,不滑动不会出现视频播放声音,必须滑动一下才能出现声音。
解决思路
1.分析日志,查找播放业务相关的代码
2.增加logStackTrace(“xxx”)用来打印出调用的栈信息
辅助方法
该方法用来查看调用的层级关系,实现原理很简单,就是生成一个Throwable,然后打印stacktrace。
fun logStackTrace(tag: String) { if (BuildConfig.DEBUG) { Log.w("logStackTrace $tag", Throwable(tag)) } } |
问题日志
于是我们得到了如下的日志
W logStackTrace : W logStackTrace : java.lang.Throwable: W logStackTrace : at com.xxxxx.commonsdk.utils.ExtensionKt.logStackTrace(Extension.kt:99) W logStackTrace : at com.xxxxx.xxxxx.xxx.video.DiscoveryVideoPlayer.setUp(DiscoveryVideoPlayer.java:786) W logStackTrace : at com.shuyu.gsyvideoplayer.video.base.GSYVideoView.setUp(GSYVideoView.java:446) W logStackTrace : at com.shuyu.gsyvideoplayer.video.base.GSYVideoControlView.setUp(GSYVideoControlView.java:541) W logStackTrace : at com.xxxxx.xxxxx.xxx.ui.adapter.VideoFeedAdapter.initVideo(VideoFeedAdapter.java:211) W logStackTrace : at com.xxxxx.xxxxx.xxx.ui.adapter.VideoFeedAdapter.onBindViewHolder(VideoFeedAdapter.java:127) W logStackTrace : at com.xxxxx.xxxxx.xxx.ui.adapter.VideoFeedAdapter.onBindViewHolder(VideoFeedAdapter.java:34) W logStackTrace : at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6673) W logStackTrace : at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6714) W logStackTrace : at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5647) W logStackTrace : at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5913) W logStackTrace : at android.support.v7.widget.GapWorker.prefetchPositionWithDeadline(GapWorker.java:285) W logStackTrace : at android.support.v7.widget.GapWorker.flushTaskWithDeadline(GapWorker.java:342) W logStackTrace : at android.support.v7.widget.GapWorker.flushTasksWithDeadline(GapWorker.java:358) W logStackTrace : at android.support.v7.widget.GapWorker.prefetch(GapWorker.java:365) W logStackTrace : at android.support.v7.widget.GapWorker.run(GapWorker.java:396) W logStackTrace : at android.os.Handler.handleCallback(Handler.java:891) W logStackTrace : at android.os.Handler.dispatchMessage(Handler.java:102) W logStackTrace : at android.os.Looper.loop(Looper.java:207) W logStackTrace : at android.app.ActivityThread.main(ActivityThread.java:7470) W logStackTrace : at java.lang.reflect.Method.invoke(Native Method) W logStackTrace : at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) W logStackTrace : at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:958) |
问题症结
问题的症结就在GapWorker调用导致了RecyclerView的item预加载处理。
解决方法
yourLayoutManager.setItemPrefetchEnabled(false); |
为什么会这样
/** * Sets whether the LayoutManager should be queried for views outside of * its viewport while the UI thread is idle between frames. * * <p>If enabled, the LayoutManager will be queried for items to inflate/bind in between * view system traversals on devices running API 21 or greater. Default value is true.</p> * * <p>On platforms API level 21 and higher, the UI thread is idle between passing a frame * to RenderThread and the starting up its next frame at the next VSync pulse. By * prefetching out of window views in this time period, delays from inflation and view * binding are much less likely to cause jank and stuttering during scrolls and flings.</p> * * <p>While prefetch is enabled, it will have the side effect of expanding the effective * size of the View cache to hold prefetched views.</p> * * @param enabled <code>True</code> if items should be prefetched in between traversals. * * @see #isItemPrefetchEnabled() */ |
上述是setItemPrefetchEnabled
的注释,item prefetch是一种用来减少滑动时卡顿的一种预加载方式。这种对于普通的RecyclerView的item没有问题,但是对于视频有声音的,就显得问题明显了。所以这里的解决方法就是关闭这个预取的设置。
以上。
标签:java,
GapWorker,
logStackTrace,
android,
播放,
RecyclerView,
xxxxx
From: https://blog.51cto.com/u_3987305/5838989