安卓：MediaPlayer的视频宽高比问题 [英] Android: MediaPlayer video aspect ratio issue
问题描述
我有，我未能解决的问题。我使用的MediaPlayer类播放视频;但是，我总是失去原有的高宽比。媒体播放器code和XML code为略。我已经尝试了很多东西，但仍然没能解决问题。我需要保持原有的高宽比。我宣布本次活动是在我的Android清单文件全屏显示。我还附上了XML code这里经过媒体播放器code。请告诉我。
I am having an issue that I am unable to resolve. I am using MediaPlayer class to play video; however, I am always loosing the original aspect ratio. The media player code and the xml code is mentioned here. I have tried so many things but still not able to resolve the issue. I need to maintain the original aspect ratio. I have declared this activity to be full screen in my Android Manifest File. I have also attached the xml code here after the media player code. Please advise me.
private class ErrorListener implements OnErrorListener {
// FIXME: @Override
public boolean onError(MediaPlayer mp, int what, int extra) {
String message = "Unknown error";
switch (what) {
case MediaPlayer.MEDIA_ERROR_UNKNOWN:
message = "Unable to play media";
showError(message);
break;
case MediaPlayer.MEDIA_ERROR_SERVER_DIED:
message = "Server failed";
showError(message);
break;
case MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK:
message = "Invalid media";
showError(message);
break;
}
return false;
}
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.videoview);
Intent intent = getIntent();
uri = intent.getData();
new loadMovie().execute();
mPreview = (SurfaceView) findViewById(R.id.videoview);
mPreview.bringToFront();
holder = mPreview.getHolder();
holder.addCallback(this);
holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
mediaPlayer = new MediaPlayer();
}// onCreate Method Ends
private void playVideo() {
doCleanUp();
try {
mediaPlayer.setDataSource(this, uri);
} catch (IllegalArgumentException e) {
e.printStackTrace();
} catch (SecurityException e) {
e.printStackTrace();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setDisplay(holder);
try {
mediaPlayer.prepare();
} catch (IllegalStateException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
mediaPlayer.setOnErrorListener(new ErrorListener());
mediaPlayer.setOnBufferingUpdateListener(this);
mediaPlayer.setOnCompletionListener(this);
mediaPlayer.setOnPreparedListener(this);
mediaPlayer.setOnVideoSizeChangedListener(this);
mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mediaController = new MediaController(this);
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mediaController.show();
return false;
}
// --MediaPlayerControl
// methods----------------------------------------------------
public void start() {
mediaPlayer.start();
}
public void pause() {
mediaPlayer.pause();
}
public int getDuration() {
return mediaPlayer.getDuration();
}
public int getCurrentPosition() {
return mediaPlayer.getCurrentPosition();
}
public void seekTo(int i) {
mediaPlayer.seekTo(i);
}
public boolean isPlaying() {
return mediaPlayer.isPlaying();
}
public int getBufferPercentage() {
return 0;
}
public boolean canPause() {
return true;
}
public boolean canSeekBackward() {
return true;
}
public boolean canSeekForward() {
return true;
}
// End of MediaPlayer
// Controls--------------------------------------------------------
// ------------------------
public void onPrepared(MediaPlayer mediaPlayer) {
mediaController.setMediaPlayer(this);
mediaController.setAnchorView(findViewById(R.id.videoview));
mIsVideoReadyToBePlayed = true;
if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
startVideoPlayback();
}
handler.post(new Runnable() {
public void run() {
mediaController.setEnabled(true);
mediaController.show();
}
});
}
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
// TODO Auto-generated method stub
}
public void surfaceCreated(SurfaceHolder holder) {
// TODO Auto-generated method stub
playVideo();
}
public void surfaceDestroyed(SurfaceHolder arg0) {
}
private void startVideoPlayback() {
holder.setFixedSize(mVideoWidth, mVideoHeight);
mediaPlayer.start();
}
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
if (width == 0 || height == 0) {
return;
}
mIsVideoSizeKnown = true;
mVideoWidth = width;
mVideoHeight = height;
if (mIsVideoReadyToBePlayed && mIsVideoSizeKnown) {
startVideoPlayback();
}
}
public void onCompletion(MediaPlayer arg0) {
}
public void onBufferingUpdate(MediaPlayer mp, int percent) {
}
private void releaseMediaPlayer() {
mediaPlayer.release();
mediaPlayer = null;
}
private void doCleanUp() {
mVideoWidth = 0;
mVideoHeight = 0;
mIsVideoReadyToBePlayed = false;
mIsVideoSizeKnown = false;
}
这里是XML：
And here is the XML:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center"
>
<SurfaceView android:id="@+id/videoview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</LinearLayout>
任何人都可以请告知我，我怎么能保持影像的高宽比？
Can anyone please advise me how can I maintain the aspect ratio of the video?
推荐答案
首先创建一个Gravity.CENTER一个相对布局，并附加在它的表面观。这将确保视频将在屏幕内的中心。
First create a Relative Layout with Gravity.CENTER, and attach your Surface View in it. This will ensure that the video will be centred inside the screen.
此外，如果你使用的是活动，用黑的主题，以避免梯度
Also if you are using an activity, use the 'black' theme to avoid the gradient
在你的SurfaceView，创建一个监听器：
In your SurfaceView, create a Listener:
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnVideoSizeChangedListener（mOnVideoSizeChangedListener）;
mMediaPlayer.setOnVideoSizeChangedListener(mOnVideoSizeChangedListener);
...
MediaPlayer.OnVideoSizeChangedListener mOnVideoSizeChangedListener = new MediaPlayer.OnVideoSizeChangedListener() {
@Override
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
setFitToFillAspectRatio(mp, width, height);
}
};
...
最后，符合贵公司的SurfaceView填写方法。这将适用于横向和纵向
Finally the fit to fill method in your SurfaceView. This will works on landscape and portrait
private void setFitToFillAspectRatio(MediaPlayer mp, int videoWidth, int videoHeight)
{
if(mp != null)
{
Integer screenWidth = ((Activity) mContext).getWindowManager().getDefaultDisplay().getWidth();
Integer screenHeight = ((Activity) mContext).getWindowManager().getDefaultDisplay().getHeight();
android.view.ViewGroup.LayoutParams videoParams = getLayoutParams();
if (videoWidth > videoHeight)
{
videoParams.width = screenWidth;
videoParams.height = screenWidth * videoHeight / videoWidth;
}
else
{
videoParams.width = screenHeight * videoWidth / videoHeight;
videoParams.height = screenHeight;
}
setLayoutParams(videoParams);
}
}
这篇关于安卓：MediaPlayer的视频宽高比问题的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
