Android SDK媒体录像机。状态4

Question

我刚刚开发一个快速的Android应用程序。

小问题。什么是状态4？

我使用的MediaPlayer我每次运行应用程序时，我得到一个错误，指出媒体播放器“开始（）”首次调用状态0，然后状态4

有谁知道什么状态4是什么？

我能找出问题，如果我知道的状态，例如状态1和2 ...

感谢，

Answer 1

这是MediaPlayer.h在Android源：

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。 在调用start（）之前是否调用了prepare（）或prepareAsync（）？

这些都是MediaRecorder指出：

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, 
}; 

所以对于记录，状态4 MEDIA_RECORDER_DATASOURCE_CONFIGURED。