OnBufferingUpdate不会被调用的MediaPlayer中 [英] OnBufferingUpdate not being called in MediaPlayer
问题描述
我OnBufferingUpdate当我试图用我的MediaPlayer使用它永远不会被调用。我使用保存在SD卡我作为媒体来源的视频。我认为这是问题的根源，我想知道，如果OnBufferingUpdate仅适用于互联网流。在code我现在用的就是以下。
公共类FullImageActivity扩展活动实现SurfaceHolder.Callback，在preparedListener，OnInfoListener，OnErrorListener，OnBufferingUpdateListener {私有静态最后弦乐TAG =MediaPlayer的狗屎;
MediaPlayer的播放器;
SurfaceView surfaceview;
SurfaceHolder surfaceHolder;
INT宽度;
INT高度;
DisplayImageOptions选择;
ViewPager viewpager;
字符串路径;
长ID;
的String [] =投影{GridviewData.ROWID，GridviewData.BITMAPPATH，GridviewData.VIDEOFILEPATH};
@覆盖
保护无效的onCreate（捆绑savedInstanceState）{
super.onCreate（savedInstanceState）;
的setContentView（R.layout.full_image）; 意向I = getIntent（）; 。ID = i.getExtras（）getLong之（ID）;
PATH = i.getExtras（）的getString（将videoPath）; surfaceview =（SurfaceView）findViewById（R.id.surfaceview）;
surfaceHolder = surfaceview.getHolder（）;
surfaceHolder.addCallback（本）;}公共无效的playVideo（）{
玩家=新的MediaPlayer（）;
尝试{
player.reset（）;
player.setOnErrorListener（本）;
档案文件=新的文件（路径）;
的FileInputStream的InputStream =新的FileInputStream（文件）;
player.setDataSource（inputStream.getFD（））; inputStream.close（）;
player.setOnBufferingUpdateListener（本）;
player.setOnInfoListener（本）;
player.setOn preparedListener（本）;
player.setDisplay（surfaceHolder）;
。玩家prepareAsync（）;
}赶上（抛出：IllegalArgumentException五）{
e.printStackTrace（）;
}赶上（SecurityException异常五）{
e.printStackTrace（）;
}赶上（IllegalStateException异常五）{
e.printStackTrace（）;
}赶上（IOException异常五）{
e.printStackTrace（）;
}}
@覆盖
保护无效的onPause（）{
surfaceview.setVisibility（View.GONE）;
如果（玩家！= NULL）
{
如果（player.isPlaying（））
player.stop（）;
player.release（）;
玩家= NULL;
}
super.onPause（）;
}
@覆盖
保护无效onResume（）{
surfaceview.setVisibility（View.VISIBLE）;
Log.i（TAG，在onResume）;
super.onResume（）;
}
@覆盖
保护无效的onStop（）{
super.onStop（）;
}
@覆盖
公共无效surfaceChanged（SurfaceHolder架，INT ARG1，ARG2 INT，INT ARG3）{
如果（玩家！= NULL）
{
尝试{
Log.i（TAG，在表面的变化）;
player.setDisplay（surfaceHolder）;
}赶上（例外五）{
e.printStackTrace（）;
}
}
}
@覆盖
公共无效surfaceCreated（SurfaceHolder持有人）{
Log.i（TAG，在表面形成）;
的playVideo（）;
}@覆盖
公共无效surfaceDestroyed（SurfaceHolder为arg0）{
Log.i（TAG，表面破坏）;
如果（玩家！= NULL）
{
如果（player.isPlaying（））
player.stop（）;
player.release（）;
玩家= NULL;
}}
@覆盖
在prepared（MediaPlayer的P）公共无效{
player.start（）;}@覆盖
公共布尔的onError（MediaPlayer的为arg0，ARG1 INT，INT ARG2）{
Log.i（TAG，出现错误）;
返回false;
}
@覆盖
公共无效onBufferingUpdate（MediaPlayer的熔点，诠释百分比）{ 如果（百分比== 50）{
Log.i（TAG，在bufferingupdate）;
}}
您已经回答了你自己的问题！ ：）
onBufferingUpdate（）只要求资源被流在网络上，因此这将不会被要求对本地资源。
<一个href=\"http://developer.android.com/reference/android/media/MediaPlayer.OnBufferingUpdateListener.html\" rel=\"nofollow\">http://developer.android.com/reference/android/media/MediaPlayer.OnBufferingUpdateListener.html
要调用的回调的接口定义说明被流通过网络媒体资源的缓冲状态。
从<一个href=\"http://grep$c$c.com/file/repository.grep$c$c.com/java/ext/com.google.android/android/4.2.2_r1/android/media/MediaPlayer.java#MediaPlayer.OnBufferingUpdateListener\"相对=nofollow>来源$ C $ C ：
在调用缓存通过渐进式HTTP下载接到媒体流来更新状态。接收到的缓冲百分比表示有多少内容被缓冲或播放。例如，当一半的内容已播放了80％的缓冲更新表示播放内容的下一个30％已经被缓冲。
My OnBufferingUpdate never gets called when I try to use it with my MediaPlayer. I'm using videos saved on my SDcard as the media source. I think this is the source of the problem and I'm wondering if OnBufferingUpdate only works for internet streams. The code I am using is below.
public class FullImageActivity extends Activity implements SurfaceHolder.Callback, OnPreparedListener, OnInfoListener, OnErrorListener, OnBufferingUpdateListener{ private static final String TAG = "MediaPlayer shit"; MediaPlayer player; SurfaceView surfaceview; SurfaceHolder surfaceHolder; int width; int height; DisplayImageOptions options; ViewPager viewpager; String path; long id; String[] projection = { GridviewData.ROWID, GridviewData.BITMAPPATH, GridviewData.VIDEOFILEPATH}; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.full_image); Intent i = getIntent(); id = i.getExtras().getLong("id"); path = i.getExtras().getString("videopath"); surfaceview = (SurfaceView)findViewById(R.id.surfaceview); surfaceHolder = surfaceview.getHolder(); surfaceHolder.addCallback(this); } public void playVideo(){ player = new MediaPlayer(); try { player.reset(); player.setOnErrorListener(this); File file = new File(path); FileInputStream inputStream = new FileInputStream(file); player.setDataSource(inputStream.getFD()); inputStream.close(); player.setOnBufferingUpdateListener(this); player.setOnInfoListener(this); player.setOnPreparedListener(this); player.setDisplay(surfaceHolder); player.prepareAsync(); } catch (IllegalArgumentException e) { e.printStackTrace(); } catch (SecurityException e) { e.printStackTrace(); } catch (IllegalStateException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } @Override protected void onPause() { surfaceview.setVisibility(View.GONE); if ( player != null ) { if ( player.isPlaying() ) player.stop(); player.release(); player = null; } super.onPause(); } @Override protected void onResume() { surfaceview.setVisibility(View.VISIBLE); Log.i(TAG, "In onResume"); super.onResume(); } @Override protected void onStop() { super.onStop(); } @Override public void surfaceChanged(SurfaceHolder holder, int arg1, int arg2, int arg3) { if ( player != null ) { try { Log.i(TAG, "In surface change"); player.setDisplay(surfaceHolder); } catch (Exception e) { e.printStackTrace(); } } } @Override public void surfaceCreated(SurfaceHolder holder) { Log.i(TAG, "in surface created"); playVideo(); } @Override public void surfaceDestroyed(SurfaceHolder arg0) { Log.i(TAG, "Surface destroyed"); if ( player != null ) { if ( player.isPlaying() ) player.stop(); player.release(); player = null; } } @Override public void onPrepared(MediaPlayer p) { player.start(); } @Override public boolean onError(MediaPlayer arg0, int arg1, int arg2) { Log.i(TAG, "THERE WAS AN ERROR"); return false; } @Override public void onBufferingUpdate(MediaPlayer mp, int percent) { if (percent == 50){ Log.i(TAG, "Within bufferingupdate"); } }
解决方案You've answered your own question! :)
onBufferingUpdate()is only called for resources being streamed over a network, so this will not be called for local resources.http://developer.android.com/reference/android/media/MediaPlayer.OnBufferingUpdateListener.html
Interface definition of a callback to be invoked indicating buffering status of a media resource being streamed over the network.
From the source code:
Called to update status in buffering a media stream received through progressive HTTP download. The received buffering percentage indicates how much of the content has been buffered or played. For example a buffering update of 80 percent when half the content has already been played indicates that the next 30 percent of the content to play has been buffered.
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