调试日志记录
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
默认情况下，ExoPlayer 仅记录错误。为了记录玩家事件，EventLogger
类。它提供的额外日志记录有助于
以及调试播放
问题。EventLogger 会实现 AnalyticsListener，因此请注册实例
使用 ExoPlayer 非常简单：
Kotlin
player.addAnalyticsListener(EventLogger())
Java
player.addAnalyticsListener(new EventLogger());
观察日志的最简单方法是使用 Android Studio 的 logcat 标签页。您
可以按软件包名称 (
androidx.media3.demo.main）并告知 logcat
选择仅显示所选应用，以仅记录该应用。时间是
可以使用表达式进一步过滤日志记录，
EventLogger|ExoPlayerImpl，用于仅获取来自 EventLogger 和
播放器本身
使用 Android Studio 的 logcat 标签页的替代方案是使用控制台。例如：
adb logcat EventLogger:* ExoPlayerImpl:* *:s
ExoPlayerImpl 类提供了关于播放器版本的两行重要代码，
运行应用的设备和操作系统，以及
已加载：
ExoPlayerImpl: Init 59a18ab [AndroidXMedia3/1.0.0-rc02] [flame, Pixel 4, Google, 33]
ExoPlayerImpl: Release 59a18ab [AndroidXMedia3/1.0.0-rc02] [flame, Pixel 4, Google, 33] [media3.common, media3.datasource, media3.ui, media3.exoplayer, media3.decoder, media3.exoplayer.dash, media3.extractor]
播放状态
玩家状态更改会以如下行记录：
EventLogger: playWhenReady [eventTime=0.00, mediaPos=0.00, window=0, true, USER_REQUEST]
EventLogger: state [eventTime=0.01, mediaPos=0.00, window=0, BUFFERING]
EventLogger: state [eventTime=0.93, mediaPos=0.00, window=0, period=0, READY]
EventLogger: isPlaying [eventTime=0.93, mediaPos=0.00, window=0, period=0, true]
EventLogger: playWhenReady [eventTime=9.40, mediaPos=8.40, window=0, period=0, false, USER_REQUEST]
EventLogger: isPlaying [eventTime=9.40, mediaPos=8.40, window=0, period=0, false]
EventLogger: playWhenReady [eventTime=10.40, mediaPos=8.40, window=0, period=0, true, USER_REQUEST]
EventLogger: isPlaying [eventTime=10.40, mediaPos=8.40, window=0, period=0, true]
EventLogger: state [eventTime=20.40, mediaPos=18.40, window=0, period=0, ENDED]
EventLogger: isPlaying [eventTime=20.40, mediaPos=18.40, window=0, period=0, false]
在该示例中，播放器准备就绪后，从 0.93 秒开始播放。通过
用户在 9.4 秒后暂停播放，并在 1 秒后以
10.4 秒。播放会在 10 秒后的 20.4 秒处结束。常见的
方括号内的元素有：
[eventTime=float]：自创建玩家以来的挂钟时间。[mediaPos=float]：当前播放位置。[window=int]：当前窗口索引。[period=int]：该窗口中的当前时间段。
每行中的最后一个元素表示所报告的状态的值。
当可用轨道或所选轨道发生更改时，系统会记录轨道信息。这个
在开始播放时至少发生一次。以下示例显示的是曲目
针对自适应流进行日志记录：
EventLogger: tracks [eventTime=0.30, mediaPos=0.00, window=0, period=0,
EventLogger: group [
EventLogger: [X] Track:0, id=133, mimeType=video/avc, bitrate=261112, codecs=avc1.4d4015, res=426x240, fps=30.0, supported=YES
EventLogger: [X] Track:1, id=134, mimeType=video/avc, bitrate=671331, codecs=avc1.4d401e, res=640x360, fps=30.0, supported=YES
EventLogger: [X] Track:2, id=135, mimeType=video/avc, bitrate=1204535, codecs=avc1.4d401f, res=854x480, fps=30.0, supported=YES
EventLogger: [X] Track:3, id=160, mimeType=video/avc, bitrate=112329, codecs=avc1.4d400c, res=256x144, fps=30.0, supported=YES
EventLogger: [ ] Track:4, id=136, mimeType=video/avc, bitrate=2400538, codecs=avc1.4d401f, res=1280x720, fps=30.0, supported=NO_EXCEEDS_CAPABILITIES
EventLogger: ]
EventLogger: group [
EventLogger: [ ] Track:0, id=139, mimeType=audio/mp4a-latm, bitrate=48582, codecs=mp4a.40.5, channels=2, sample_rate=22050, supported=YES
EventLogger: [X] Track:1, id=140, mimeType=audio/mp4a-latm, bitrate=127868, codecs=mp4a.40.2, channels=2, sample_rate=44100, supported=YES
EventLogger: ]
EventLogger: ]
在该示例中，播放器从当前显示的 5 个视频中
。未选择第五个视频轨道，因为它超出了
设备的功能（以 supported=NO_EXCEEDS_CAPABILITIES 表示）。
播放期间，播放器将在所选的视频轨道之间进行调整。时间
而是会按照上一首
如下：
EventLogger: downstreamFormat [eventTime=3.64, mediaPos=3.00, window=0, period=0, id=134, mimeType=video/avc, bitrate=671331, codecs=avc1.4d401e, res=640x360, fps=30.0]
此日志行表示播放器已切换到 640x360 分辨率的视频
然后向媒体跟踪三秒钟
解码器选择
在大多数情况下，ExoPlayer 使用从MediaCodec
底层平台当解码器初始化时，它会记录在如下行中：
这些：
EventLogger: videoDecoderInitialized [0.77, 0.00, window=0, period=0, video, OMX.qcom.video.decoder.avc]
EventLogger: audioDecoderInitialized [0.79, 0.00, window=0, period=0, audio, OMX.google.aac.decoder]
本页面上的内容和代码示例受内容许可部分所述许可的限制。Java 和 OpenJDK 是 Oracle 和/或其关联公司的注册商标。
最后更新时间 (UTC)：2025-07-27。
[null,null,["最后更新时间 (UTC)：2025-07-27。"],[],[],null,["# Debug logging\n\nBy default, ExoPlayer only logs errors. To log player events, the `EventLogger`\nclass can be used. The additional logging it provides can be helpful for\nunderstanding what the player is doing, as well as for debugging playback\nissues. `EventLogger` implements `AnalyticsListener`, so registering an instance\nwith an `ExoPlayer` is easy: \n\n### Kotlin\n\n```kotlin\nplayer.addAnalyticsListener(EventLogger())\n```\n\n### Java\n\n```java\nplayer.addAnalyticsListener(new EventLogger());\n```\n\n\u003cbr /\u003e\n\nThe easiest way to observe the log is using Android Studio's [logcat tab](/studio/debug/am-logcat). You\ncan select your app as debuggable process by the package name (\n`androidx.media3.demo.main` if using the demo app) and tell the logcat\ntab to log only for that app by selecting **show only selected application** . It's\npossible to further filter the logging with the expression\n`EventLogger|ExoPlayerImpl`, to get only logging from `EventLogger` and the\nplayer itself.\n\nAn alternative to using Android Studio's logcat tab is to use the console. For\nexample: \n\n adb logcat EventLogger:* ExoPlayerImpl:* *:s\n\n### Player information\n\nThe `ExoPlayerImpl` class delivers two important lines about the player version,\nthe device and OS the app is running on and the modules of ExoPlayer that have\nbeen loaded: \n\n ExoPlayerImpl: Init 59a18ab [AndroidXMedia3/1.0.0-rc02] [flame, Pixel 4, Google, 33]\n ExoPlayerImpl: Release 59a18ab [AndroidXMedia3/1.0.0-rc02] [flame, Pixel 4, Google, 33] [media3.common, media3.datasource, media3.ui, media3.exoplayer, media3.decoder, media3.exoplayer.dash, media3.extractor]\n\n### Playback state\n\nPlayer state changes are logged in lines like these: \n\n EventLogger: playWhenReady [eventTime=0.00, mediaPos=0.00, window=0, true, USER_REQUEST]\n EventLogger: state [eventTime=0.01, mediaPos=0.00, window=0, BUFFERING]\n EventLogger: state [eventTime=0.93, mediaPos=0.00, window=0, period=0, READY]\n EventLogger: isPlaying [eventTime=0.93, mediaPos=0.00, window=0, period=0, true]\n EventLogger: playWhenReady [eventTime=9.40, mediaPos=8.40, window=0, period=0, false, USER_REQUEST]\n EventLogger: isPlaying [eventTime=9.40, mediaPos=8.40, window=0, period=0, false]\n EventLogger: playWhenReady [eventTime=10.40, mediaPos=8.40, window=0, period=0, true, USER_REQUEST]\n EventLogger: isPlaying [eventTime=10.40, mediaPos=8.40, window=0, period=0, true]\n EventLogger: state [eventTime=20.40, mediaPos=18.40, window=0, period=0, ENDED]\n EventLogger: isPlaying [eventTime=20.40, mediaPos=18.40, window=0, period=0, false]\n\nIn this example playback starts 0.93 seconds after the player is prepared. The\nuser pauses playback after 9.4 seconds, and resumes playback one second later at\n10.4 seconds. Playback ends ten seconds later at 20.4 seconds. The common\nelements within the square brackets are:\n\n- `[eventTime=float]`: The wall clock time since player creation.\n- `[mediaPos=float]`: The current playback position.\n- `[window=int]`: The current window index.\n- `[period=int]`: The current period in that window.\n\nThe final elements in each line indicate the value of the state being reported.\n\n### Media tracks\n\nTrack information is logged when the available or selected tracks change. This\nhappens at least once at the start of playback. The example below shows track\nlogging for an adaptive stream: \n\n EventLogger: tracks [eventTime=0.30, mediaPos=0.00, window=0, period=0,\n EventLogger: group [\n EventLogger: [X] Track:0, id=133, mimeType=video/avc, bitrate=261112, codecs=avc1.4d4015, res=426x240, fps=30.0, supported=YES\n EventLogger: [X] Track:1, id=134, mimeType=video/avc, bitrate=671331, codecs=avc1.4d401e, res=640x360, fps=30.0, supported=YES\n EventLogger: [X] Track:2, id=135, mimeType=video/avc, bitrate=1204535, codecs=avc1.4d401f, res=854x480, fps=30.0, supported=YES\n EventLogger: [X] Track:3, id=160, mimeType=video/avc, bitrate=112329, codecs=avc1.4d400c, res=256x144, fps=30.0, supported=YES\n EventLogger: [ ] Track:4, id=136, mimeType=video/avc, bitrate=2400538, codecs=avc1.4d401f, res=1280x720, fps=30.0, supported=NO_EXCEEDS_CAPABILITIES\n EventLogger: ]\n EventLogger: group [\n EventLogger: [ ] Track:0, id=139, mimeType=audio/mp4a-latm, bitrate=48582, codecs=mp4a.40.5, channels=2, sample_rate=22050, supported=YES\n EventLogger: [X] Track:1, id=140, mimeType=audio/mp4a-latm, bitrate=127868, codecs=mp4a.40.2, channels=2, sample_rate=44100, supported=YES\n EventLogger: ]\n EventLogger: ]\n\nIn this example, the player has selected four of the five available video\ntracks. The fifth video track is not selected because it exceeds the\ncapabilities of the device, as indicated by `supported=NO_EXCEEDS_CAPABILITIES`.\nThe player will adapt between the selected video tracks during playback. When\nthe player adapts from one track to another, it's logged in a line like the one\nbelow: \n\n EventLogger: downstreamFormat [eventTime=3.64, mediaPos=3.00, window=0, period=0, id=134, mimeType=video/avc, bitrate=671331, codecs=avc1.4d401e, res=640x360, fps=30.0]\n\nThis log line indicates that the player switched to the 640x360 resolution video\ntrack three seconds into the media.\n\n### Decoder selection\n\nIn most cases, ExoPlayer renders media using a `MediaCodec` acquired from the\nunderlying platform. When a decoder is initialized, this is logged in lines like\nthese: \n\n EventLogger: videoDecoderInitialized [0.77, 0.00, window=0, period=0, video, OMX.qcom.video.decoder.avc]\n EventLogger: audioDecoderInitialized [0.79, 0.00, window=0, period=0, audio, OMX.google.aac.decoder]"]]
