Android SDK媒体录制器.州4

Question

我刚刚开始开发一个快速的Android应用程序.

小问题.什么是州4？

我正在使用MediaPlayer,每次运行应用程序时都会收到错误消息,指出Media Player"start()"首先在状态0中调用,然后是状态4.

有谁知道4是什么状态？

如果我知道状态1和2等状态,我可以找出问题...

谢谢,

Answer 1

这是来自Android源中的MediaPlayer.h:

enum media_player_states {
  MEDIA_PLAYER_STATE_ERROR        = 0,
  MEDIA_PLAYER_IDLE               = 1 << 0,
  MEDIA_PLAYER_INITIALIZED        = 1 << 1,
  MEDIA_PLAYER_PREPARING          = 1 << 2,
  MEDIA_PLAYER_PREPARED           = 1 << 3,
  MEDIA_PLAYER_DECODED            = 1 << 4,
  MEDIA_PLAYER_STARTED            = 1 << 5,
  MEDIA_PLAYER_PAUSED             = 1 << 6,
  MEDIA_PLAYER_STOPPED            = 1 << 7,
  MEDIA_PLAYER_PLAYBACK_COMPLETE  = 1 << 8
};

因此0将是MEDIA_PLAYER_STATE_ERROR,4将是MEDIA_PLAYER_PREPARING.你在调用start()之前调用了prepare()或prepareAsync()吗？

这些是MediaRecorder声明的:

enum media_recorder_states {
  MEDIA_RECORDER_ERROR                 =      0,
  MEDIA_RECORDER_IDLE                  = 1 << 0,
  MEDIA_RECORDER_INITIALIZED           = 1 << 1,
  MEDIA_RECORDER_DATASOURCE_CONFIGURED = 1 << 2,
  MEDIA_RECORDER_PREPARED              = 1 << 3,
  MEDIA_RECORDER_RECORDING             = 1 << 4,
};

因此,对于录制,状态4是MEDIA_RECORDER_DATASOURCE_CONFIGURED.