Android使用MediaPlayer播放视频步骤
04 Nov 2013MediaPlayer状态变换图：
图片来自Google Android Doc
public class MainActivity extends Activity {
Display display;
SurfaceHolder surfaceHolder;
SurfaceView surfaceView;
MediaPlayer mediaPlayer;
// 视频宽高
int width = 0;
int height = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
display = getWindowManager().getDefaultDisplay();
String file = Environment.getExternalStorageDirectory()
.getAbsolutePath() + "/Movies/1.m4v";
surfaceView = (SurfaceView) findViewById(R.id.sv);
surfaceHolder = surfaceView.getHolder();
surfaceHolder.addCallback(new SurfaceHolder.Callback() {
// 当SurfaceView销毁时调用
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// TODO Auto-generated method stub
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
// MediaPlayer通过SurfaceHolder与SurfaceView联系在一起
mediaPlayer.setDisplay(holder);
}
// 当SurfaceView大小发生变化时调用
@Override
public void surfaceChanged(SurfaceHolder holder, int format,
int width, int height) {
// TODO Auto-generated method stub
}
});
mediaPlayer = new MediaPlayer();
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
// TODO Auto-generated method stub
}
});
mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
Log.v("MediaPlayer", "play completion");
}
});
mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
if (what == MediaPlayer.MEDIA_ERROR_SERVER_DIED) {
Log.v("MediaPlayer", "MediaPlayer Server died");
} else if (what == MediaPlayer.MEDIA_ERROR_UNKNOWN) {
Log.v("MediaPlayer", "Unknown error in MediaPlayer: "
+ extra);
}
// 这里返回false表明没有处理捕捉到的错误，将交由上层来处理。如果mediaPlayer注册了OnCompletionListener,系统将会调用其onCompletion方法
return false;
}
});
mediaPlayer.setOnSeekCompleteListener(new MediaPlayer.OnSeekCompleteListener() {
@Override
public void onSeekComplete(MediaPlayer mp) {
Log.v("MediaPlayer", "MediaPlayer seek complete");
}
});
mediaPlayer.setOnVideoSizeChangedListener(new MediaPlayer.OnVideoSizeChangedListener() {
@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
Log.v("MediaPlayer", "VideoSizeChanged: " + String.valueOf(width) + "x" + String.valueOf(height));
}
});
mediaPlayer.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
@Override
public void onPrepared(MediaPlayer mp) {
// 获取视频大小
width = mp.getVideoWidth();
height = mp.getVideoHeight();
// 对视频宽高进行缩放
if (width > display.getWidth() || height > display.getHeight()) {
float heightRatio = (float) height / display.getHeight();
float widthRatio = (float) width / display.getWidth();
if (heightRatio > 1 || widthRatio > 1) {
if (heightRatio > widthRatio) {
height = (int) Math.ceil(height / heightRatio);
width = (int) Math.ceil(width / heightRatio);
} else {
height = (int) Math.ceil(height / widthRatio);
width = (int) Math.ceil(width / widthRatio);
}
}
}
// 设置SurfaceView的大小
surfaceView.setLayoutParams(new LinearLayout.LayoutParams(
width, height));
//开始播放
mp.start();
}
});
try {
mediaPlayer.setDataSource(file);
} catch (IllegalArgumentException e) {
e.printStackTrace();
finish();
} catch (IllegalStateException e) {
e.printStackTrace();
finish();
} catch (IOException e) {
e.printStackTrace();
finish();
}
try {
mediaPlayer.prepareAsync();
} catch (IllegalStateException e) {
e.printStackTrace();
finish();
}
}
}
git clone https://github.com/lnmcc/VideoPlayerUsingMediaPlayer.git
