Basic knowledge about Android mediaplayer

Document directory

• Valid and invalid states
• How can I get the total length and current playback Time of the current video?

 

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 toErrorState.
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 toErrorState.
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 toErrorState.
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 toErrorState.
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 toErrorState.
Pause	{Started, paused}	{Idle, initialized, prepared, stopped, playbackcompleted, error}	Successful invoke of this method in a valid state transfers the object toPausedState. Calling this method in an invalid state transfers the object toErrorState.
Prepare	{Initialized, stopped}	{Idle, prepared, started, paused, playbackcompleted, error}	Successful invoke of this method in a valid state transfers the object toPreparedState. 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 toPreparingState. Calling this method in an invalid state throws an illegalstateexception.
Release	Any	{}	Afterrelease(), The object is no longer available.
Reset	{Idle, initialized, prepared, started, paused, stopped, playbackcompleted, error}	{}	Afterreset(), 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 toErrorState.
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 valid tive, 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 toInitializedState. 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 toErrorState.
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 toStartedState. Calling this method in an invalid state transfers the object toErrorState.
Stop	{Prepared, started, stopped, paused, playbackcompleted}	{Idle, initialized, error}	Successful invoke of this method in a valid state transfers the object toStoppedState. Calling this method in an invalid state transfers the object toErrorState.

How can I get the total length and current playback Time of the current video?

1) Call mediaplayer. getduration () according to the status requirements in the preceding table to obtain the total duration.

2) create a new thread and call mediaplayer. getcurrentposition () every second to obtain the current playback time.