[Android, 16] android Video Player

Video Player Development:

 

1. SurfaceView:

1. Display in unit time.

2. Internal dual-buffer mechanism:

3. directly operate the video memory of the video card, which is faster.

 

 

2. Specific steps for video playback development:

1. layout interface:

 

Android: layout_width = "fill_parent"

>

Android: orientation = "vertical">

 

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

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Android: textSize = "20sp"/>

 

Android: id = "@ + id/et_path"

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

>

 

 

 

Android: layout_width = "fill_parent"

Android: layout_height = "wrap_content"

Android: gravity = "center_horizontal"

Android: orientation = "horizontal">

 

Android: id = "@ + id/play"

Android: layout_width = "0dip"

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Android: layout_weight = "1"

Android: text = "play"/>

 

Android: id = "@ + id/pause"

Android: layout_width = "0dip"

Android: layout_height = "wrap_content"

>

Android: text = "paused"/>

 

Android: id = "@ + id/replay"

Android: layout_width = "0dip"

Android: layout_height = "wrap_content"

Android: layout_weight = "1"

>

 

Android: id = "@ + id/stop"

Android: layout_width = "0dip"

Android: layout_height = "wrap_content"

Android: layout_weight = "1"

Android: text = "stop"/>

 

// Controls for displaying videos:

Android: id = "@ + id/sv"

Android: layout_width = "fill_parent"

Android: layout_height = "fill_parent"/>

 

 

2. Video Player operations:

① Playback:
 

MediaPlayer>

MediaPlayer. setAudioStreamType (AudioManager. STREAM_MUSIC );

// Obtain the SurfaceView object:

SurfaceView>

// Obtain the SurfaceHolder object through SurfaceView

SurfaceHolder>

// Specify the control that displays the video to be played.

MediaPlayer. setDisplay (holder );

// Set the playback resource path, for example,/sdcard/oppo.3gp

MediaPlayer. setDataSource (path );

// Initialize the player:

Method 1: Synchronous:

MediaPlayer. prepare ();

Method 2: asynchronous:

MediaPlayer. prepareAsync (); // asynchronous preparation

// Set the listener for asynchronous preparation. After asynchronous preparation is complete, call the following method:

MediaPlayer. setOnPreparedListener (new OnPreparedListener (){

 

Public>

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>

 

>

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}

 

③ Stop:

Private>

// Obtain the current playback position

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// Obtain the SurfaceHolder object through SurfaceView

SurfaceHolder>

// Specify the control that displays the video to be played.

MediaPlayer. setDisplay (holder );

②. Solution: Set the callback function for the SurfaceHolder object:

Surfaceview>

// Set the callback method of SurfaceHolder;

Sv. getHolder (). addCallback (new Callback (){

 

// Call this method when SurfaceHolder is destroyed:

>

Mediaplater. reset (); // return to the Idle status

 

 

2. Use setDataSource (); To set the playback data source

 

3. The underlying c code initializes the player.

Method 1: mediaplayer. prepare ();

Synchronization method.

If no preparation is complete, the following code will not be executed

Mediaplayer. start ();

 

Method 2: mediaplayer. prepareAsync ();

Asynchronous Method,

To know when to register the onPreparedListener listener after preparation, the internal onPrepared () method is called:

Play the video in the onPrepared () method.

 

5. Play online video files:

1. If we want to play a Streaming Media Resource online:

The requirement must be a resource file that supports progressive download, that is, the video is divided into several frames of resources, each frame is a picture that can be independently played.

2. resources that support progressive download:

3gp supports http: // protocol download

Rtsp: //>