AndroidVideoView类实例讲解资源-CSDN文库

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Android VideoView类实例讲解类实例讲解

本节使用系统的示例类VideoView继续SurfaceView类相关内容的讲解，以让大家能更深入理解Android系统中图形绘制

基础类的实现原理。也许你会发现无法改变VideoView类的控制方面，我们可以通过重构VideoView类来实现更加个性化的播

放器。

下面是下面是VideoView类的相关代码。类的相关代码。

Java 代码

public class VideoView extends SurfaceView implements MediaPlayerControl {

private String TAG = "VideoView";

// settable by the client

private Uri mUri;

private int mDuration;

// all possible internal states

private static final int STATE_ERROR = -1;

private static final int STATE_IDLE = 0;

private static final int STATE_PREPARING = 1;

private static final int STATE_PREPARED = 2;

private static final int STATE_PLAYING = 3;

private static final int STATE_PAUSED = 4;

private static final int STATE_PLAYBACK_COMPLETED = 5;

// mCurrentState is a VideoView object's current state.

// mTargetState is the state that a method caller intends to reach.

// For instance, regardless the VideoView object's current state,

// calling pause() intends to bring the object to a target state

// of STATE_PAUSED.

private int mCurrentState = STATE_IDLE;

private int mTargetState = STATE_IDLE;

// All the stuff we need for playing and showing a video

private SurfaceHolder mSurfaceHolder = null;

private MediaPlayer mMediaPlayer = null;

private int mVideoWidth;

private int mVideoHeight;

private int mSurfaceWidth;

private int mSurfaceHeight;

private MediaController mMediaController;

private OnCompletionListener mOnCompletionListener;

private MediaPlayer.OnPreparedListener mOnPreparedListener;

private int mCurrentBufferPercentage;

private OnErrorListener mOnErrorListener;

private int mSeekWhenPrepared; // recording the seek position while preparing

private boolean mCanPause;

private boolean mCanSeekBack;

private boolean mCanSeekForward;

public VideoView(Context context) {

super(context);

initVideoView();

}

public VideoView(Context context, AttributeSet attrs) {

this(context, attrs, 0);

initVideoView();

}

public VideoView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

initVideoView();

}

@Override

protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

//Log.i("@@@@", "onMeasure");

int width = getDefaultSize(mVideoWidth, widthMeasureSpec);

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