如何解决运行时异常:停止失败用于 MediaRecorder
请注意,这是一个 RuntimeException
问题,而不是更常见的 IllegalStateException
。我在 Stackoverflow 1,2 中查看了以下问题,但他们不知道如何解决我的问题(实际上他们没有任何答案,并且代码片段与我的不完全一样,所以我将很难像在我的案例中那样精确地追踪问题)。
所以我的代码如下:
private var mediaProjection: MediaProjection? = null
private var mediaRecorder: MediaRecorder
private var virtualDisplay: VirtualDisplay? = null
private var width = 567
private var height = 1222
fun startScreenRecording() {
projectionManager =
getSystemService(Context.MEDIA_PROJECTION_SERVICE) as MediaProjectionManager
mediaProjection = projectionManager.getMediaProjection(resultCode,data)?.let {
initRecorder()
virtualDisplay = mediaProjection?.createVirtualDisplay(
"MainScreen",width,height,dpi,DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,mediaRecorder.surface,null,null
)
mediaRecorder.start()
}
}
private fun initRecorder() {
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE)
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
mediaRecorder.setOutputFile(saveFile)
mediaRecorder.setVideoSize(width,height)
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264)
mediaRecorder.setVideoEncodingBitRate(5 * 1024 * 1024)
mediaRecorder.setVideoFrameRate(30)
try {
mediaRecorder.prepare()
} catch (e: IOException) {
//TODO handle errors
}
}
fun stopRecord(): Boolean {
mediaRecorder.stop()
mediaRecorder.reset()
virtualDisplay?.release()
mediaProjection?.stop()
return true
}
我收到以下异常:
java.lang.RuntimeException: Unable to start service com.mobile.android.recorder.screen.RecorderService@3db2c5c with Intent { cmp=com.mobile.android.staging/com.mobile.android.recorder.screen.RecorderService (has extras) }: java.lang.RuntimeException: stop failed.
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3696)
at android.app.ActivityThread.-wrap21(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1801)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.RuntimeException: stop failed.
at android.media.MediaRecorder._stop(Native Method)
at android.media.MediaRecorder.stop(MediaRecorder.java:1343)
at com.mobile.android.recorder.screen.ScreenRecorderUtil.stopRecord(ScreenRecorderUtil.kt:83)
at com.mobile.android.recorder.screen.RecorderService.stopScreenRecording(RecorderService.kt:117)
at com.mobile.android.recorder.screen.RecorderService.onStartCommand(RecorderService.kt:90)
at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:3679)
at android.app.ActivityThread.-wrap21(Unknown Source:0)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1801)
at android.os.Handler.dispatchMessage(Handler.java:105)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
注意异常发生在 stopRecord
函数的第一行。可能堆栈跟踪没有完全意义,但这是因为我试图去除所有不必要的代码复杂性。
还要注意我设置的非常奇怪的宽度和高度 private var width = 567
private var height = 1222
。这使我有很强的可重复性错误。在我的实际代码中,值是 720 和 1080,它们大部分都可以工作,但是很少有设备会出现上述错误。这就是说,我确信以下行是为将在停止时抛出的异常设置基础:
virtualDisplay = mediaProjection?.createVirtualDisplay(
"MainScreen",null
)
stop
方法的 Android 文档指出:
* Note that a RuntimeException is intentionally thrown to the
* application,if no valid audio/video data has been received when stop()
* is called.
将此与我观察到的结果相结合,我得出结论,支持的宽度和高度是特定于设备的,我需要正确配置才能获得任何记录。但是,我从未找到任何文档如何确定特定设备的宽度和高度的工作对(例如,就像我们对相机 getSupportedPreviewSizes
method of Camera
的预览尺寸所做的那样)。有人可以建议如何避免此错误吗?
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