Android-超好用的播放器——ijkplayer，移动应用开发课程感想

//生成一个新的surface view
surfaceView = new SurfaceView(mContext);
surfaceView.getHolder().addCallback(new LmnSurfaceCallback());
LayoutParams layoutParams = new LayoutParams(LayoutParams.MATCH_PARENT
, LayoutParams.MATCH_PARENT, Gravity.CENTER);
surfaceView.setLayoutParams(layoutParams);
this.addView(surfaceView);
}

/**

• surfaceView的监听器
  */
  private class LmnSurfaceCallback implements SurfaceHolder.Callback {
  @Override
  public void surfaceCreated(SurfaceHolder holder) {
  }

@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
//surfaceview创建成功后，加载视频
load();
}

@Override
public void surfaceDestroyed(SurfaceHolder holder) {
}
}

/**

• 加载视频
  */
  private void load() {
  //每次都要重新创建IMediaPlayer
  createPlayer();
  try {
  mMediaPlayer.setDataSource(mPath);
  } catch (IOException e) {
  e.printStackTrace();
  }
  //给mediaPlayer设置视图
  mMediaPlayer.setDisplay(surfaceView.getHolder());

mMediaPlayer.prepareAsync();
}

/**

• 创建一个新的player
  */
  private void createPlayer() {
  if (mMediaPlayer != null) {
  mMediaPlayer.stop();
  mMediaPlayer.setDisplay(null);
  mMediaPlayer.release();
  }
  IjkMediaPlayer ijkMediaPlayer = new IjkMediaPlayer();
  ijkMediaPlayer.native_setLogLevel(IjkMediaPlayer.IJK_LOG_DEBUG);

//开启硬解码 ijkMediaPlayer.setOption(IjkMediaPlayer.OPT_CATEGORY_PLAYER, “mediacodec”, 1);

mMediaPlayer = ijkMediaPlayer;

if (listener != null) {
mMediaPlayer.setOnPreparedListener(listener);
mMediaPlayer.setOnInfoListener(listener);
mMediaPlayer.setOnSeekCompleteListener(listener);
mMediaPlayer.setOnBufferingUpdateListener(listener);
mMediaPlayer.setOnErrorListener(listener);
}
}

public void setListener(VideoPlayerListener listener) {
this.listener = listener;
if (mMediaPlayer != null) {
mMediaPlayer.setOnPreparedListener(listener);
}
}

/**

• -------======--------- 下面封装了一下控制视频的方法
  */

public void start() {
if (mMediaPlayer != null) {
mMediaPlayer.start();
}
}

public void release() {
if (mMediaPlayer != null) {
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
}

public void pause() {
if (mMediaPlayer != null) {
mMediaPlayer.pause();
}
}

public void stop() {
if (mMediaPlayer != null) {
mMediaPlayer.stop();
}
}

public void reset() {
if (mMediaPlayer != null) {
mMediaPlayer.reset();
}
}

public long getDuration() {
if (mMediaPlayer != null) {
return mMediaPlayer.getDuration();
} else {
return 0;
}
}

public long getCurrentPosition() {
if (mMediaPlayer != null) {
return mMediaPlayer.getCurrentPosition();
} else {
return 0;
}
}

public void seekTo(long l) {
if (mMediaPlayer != null) {
mMediaPlayer.seekTo(l);
}
}
}

我们这个控件继承自framelayout。这个控件负责存放一个surfaceView和一个IMediaPlayer 。

3，设置监听器，我自己定义了一个监听器，继承了IMediaPlayer的n个listener。

public abstract class VideoPlayerListener implements IMediaPlayer.OnBufferingUpdateListener, IMediaPlayer.OnCompletionListener, IMediaPlayer.OnPreparedListener, IMediaPlayer.OnInfoListener, IMediaPlayer.OnVideoSizeChangedListener, IMediaPlayer.OnErrorListener, IMediaPlayer.OnSeekCompleteListener {
}

当我们继承这个抽象类的时候，最重要的是在onPrepared()方法中，让视频开始播放：

ijkPlayer.setListener(new VideoPlayerListener() {
@Override
public void onBufferingUpdate(IMediaPlayer mp, int percent) {
}

@Override
public void onCompletion(IMediaPlayer mp) {
}

@Override
public boolean onError(IMediaPlayer mp, int what, int extra) {
return false;
}

@Override
public boolean onInfo(IMediaPlayer mp, int what, int extra) {
return false;
}

@Override
public void onPrepared(IMediaPlayer mp) {
// 视频准备好播放了，但是他不会自动播放，需要手动让他开始。
mp.start();
}

@Override
public void onSeekComplete(IMediaPlayer mp) {

}

@Override
public void onVideoSizeChanged(IMediaPlayer mp, int width, int height, int sar_num, int sar_den) {
//在此可以获取到视频的宽和高
}
});

3. 在xml中放入播放器控件
4. 在activity中加载so包，设置监听器，设置路径

//加载native库
try {
IjkMediaPlayer.loadLibrariesOnce(null);
IjkMediaPlayer.native_profileBegin(“libijkplayer.so”);
} catch (Exception e) {
this.finish();
}
ijkPlayer.setListener(…)
ijkPlayer.setVideoPath(path);

记得在onStop()方法中关闭native库

IjkMediaPlayer.native_profileEnd();

这样就完成了一个简单的视频播放器了。

注意事项

1，IjkMediaPlayer的setDataSource是不建议重新赋值的，每次更改视频源都需要：player.release() -> create new player -> player.setDataSource。

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