Android MediaPlayer基本知识_第1张图片

Valid and invalid states

Method Name

Valid Sates

Invalid States

Comments

attachAuxEffect

{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Idle, Error}

This method must be called after setDataSource. Calling it does not change the object state.

getAudioSessionId

any

{}

This method can be called in any state and calling it does not change the object state.

getCurrentPosition

{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

getDuration

{Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Idle, Initialized, Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

getVideoHeight

{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

getVideoWidth

{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

isPlaying

{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted}

{Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

pause

{Started, Paused}

{Idle, Initialized, Prepared, Stopped, PlaybackCompleted, Error}

Successful invoke of this method in a valid state transfers the object to thePaused state. Calling this method in an invalid state transfers the object to theError state.

prepare

{Initialized, Stopped}

{Idle, Prepared, Started, Paused, PlaybackCompleted, Error}

Successful invoke of this method in a valid state transfers the object to thePrepared state. Calling this method in an invalid state throws an IllegalStateException.

prepareAsync

{Initialized, Stopped}

{Idle, Prepared, Started, Paused, PlaybackCompleted, Error}

Successful invoke of this method in a valid state transfers the object to thePreparing state. Calling this method in an invalid state throws an IllegalStateException.

release

any

{}

After release(), the object is no longer available.

reset

{Idle, Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}

{}

After reset(), the object is like being just created.

seekTo

{Prepared, Started, Paused, PlaybackCompleted}

{Idle, Initialized, Stopped, Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

setAudioSessionId

{Idle}

{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}

This method must be called in idle state as the audio session ID must be known before calling setDataSource. Calling it does not change the object state.

setAudioStreamType

{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}

{Error}

Successful invoke of this method does not change the state. In order for the target audio stream type to become effective, this method must be called before prepare() or prepareAsync().

setAuxEffectSendLevel

any

{}

Calling this method does not change the object state.

setDataSource

{Idle}

{Initialized, Prepared, Started, Paused, Stopped, PlaybackCompleted, Error}

Successful invoke of this method in a valid state transfers the object to theInitialized state. Calling this method in an invalid state throws an IllegalStateException.

setDisplay

any

{}

This method can be called in any state and calling it does not change the object state.

setSurface

any

{}

This method can be called in any state and calling it does not change the object state.

setLooping

{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}

{Error}

Successful invoke of this method in a valid state does not change the state. Calling this method in an invalid state transfers the object to theError state.

isLooping

any

{}

This method can be called in any state and calling it does not change the object state.

setOnBufferingUpdateListener

any

{}

This method can be called in any state and calling it does not change the object state.

setOnCompletionListener

any

{}

This method can be called in any state and calling it does not change the object state.

setOnErrorListener

any

{}

This method can be called in any state and calling it does not change the object state.

setOnPreparedListener

any

{}

This method can be called in any state and calling it does not change the object state.

setOnSeekCompleteListener

any

{}

This method can be called in any state and calling it does not change the object state.

setScreenOnWhilePlaying</> any

{}

This method can be called in any state and calling it does not change the object state.

setVolume

{Idle, Initialized, Stopped, Prepared, Started, Paused, PlaybackCompleted}

{Error}

Successful invoke of this method does not change the state.
setWakeMode

any

{}

This method can be called in any state and calling it does not change the object state.

start

{Prepared, Started, Paused, PlaybackCompleted}

{Idle, Initialized, Stopped, Error}

Successful invoke of this method in a valid state transfers the object to theStarted state. Calling this method in an invalid state transfers the object to theError state.

stop

{Prepared, Started, Stopped, Paused, PlaybackCompleted}

{Idle, Initialized, Error}

Successful invoke of this method in a valid state transfers the object to theStopped state. Calling this method in an invalid state transfers the object to theError state.

如何获取当前播放视频的总长度和当前播放时间？

1) 根据上表的状态要求调用mediaplayer.getDuration()得到总时长

2) 创建一个新线程，每秒调用mediaplayer.getCurrentPosition ()获取当前播放时间

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