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android音视频播放学习之MediaPlayer学习记录

分类: 文章 • 2023-11-11 09:36:28

     最近项目中涉及到音视频开发，选择MediaPlayer+surfaceView的方式播放视频。翻阅开发者文档学习了解下MediaPlaer的介绍和使用，在这里记录下对MediaPlaer的理解。

    MediaPlayer可以用于播放本地、网络或者apk包中的音视频文件，用setDataSource()方法设置文件的路径。首先MediaPlayer是一个状态机，有下面几个状态：idle（闲置）、initialized、prepared、start、pause、stop、playbackCompleted、end、error。当mediaplayer使用new创建出来或者调用了reset()方法后mediaplayer处于idle状态，此时需要调用prepare()（同步方法）或者​​​​​​​ prepareAsync()（异步方法）才能使mediaplayer处于可用状态。

  当mediaplayer刚创建或调用reset（）方法使mediaplayer处于idle状态调用start()等方法时出现的一些区别：
当mediaplayer刚创建时，调用start（）方法，mediaplayer的状态不会改变，如果设置了OnErrorListener，其中的onError（）方法不会被调用。

android音视频播放学习之MediaPlayer学习记录

  当调用reset（）方法处于idle状态时调用start（）方法会是mediaplayer处于error状态，此时如果设置了OnErrorListener，其中的onError（）方法将会被调用。

      调用 release()会释放的资源，使mediaplayer处于end状态，此时在调用其他方法都不会改变mediaplayer的状态，此方法调用应该在不再使用mediaplayer时调用。

  MediaPlayer可以设置一些监听：

    mediaplayer中的方法需要在对应的状态中调用否则会将mediaplayer转为error状态,以下为各个方法调用的有效状态和无效状态表格：

  •   Valid Sates

     

    		 Invalid States

     

    		 Comments

     
    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 the Error 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 the Error 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 the Error 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 the Error 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 the Error state.

     
    pause

     

    		 {Started, Paused}

     

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

     

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

     
    prepare

     

    		 {Initialized, Stopped}

     

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

     

    		 Successful invoke of this method in a valid state transfers the object to the Prepared 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 the Preparing 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 the Error state.

     
    setAudioStreamType

     

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

     

    		 {Error}

     

    		 Successful invoke of this method does not change the state.

     
    setDataSource

     

    		 {Idle}

     

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

     

    		 Successful invoke of this method in a valid state transfers the object to the Initialized 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.

     
    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 the Error 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 the Started state. Calling this method in an invalid state transfers the object to the Error state.

     
    stop

     

    		 {Prepared, Started, Stopped, Paused, PlaybackCompleted}

     

    		 {Idle, Initialized, Error}

     

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

     

 

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