android mediaplayer 視頻修改視頻大小 （屏幕尺寸mediaPlayer =...

1 主要是通過更改view 的大小來改變視頻的大小。

2 在視頻初始化時獲得視頻的高寬都為0 ，這個必須要注意，必須播放後延時 修改view 大小

3 sufaceview 的布局類是 android.widget.LinearLayout.LayoutParams 這個必須注意

4 在 sufaceview surfaceChanged事件中加入 mediaPlayer.setDisplay(arg0) ，  setDisplay 方法在任意時刻都是可以調用的

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    try {
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                Log.e("m3u8", mediapath);
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                mediaPlayer = new MediaPlayer();
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                // 開始准備播放
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                uiHandler.sendMessage(uiHandler
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                        .obtainMessage(MediaPlayerMessage.PREPARE));
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                // 設置媒體的路徑
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                mediaPlayer.setDataSource(mediapath);
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                // 設置邊播放變緩沖
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                mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
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                mediaPlayer.prepareAsync();
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            } catch (Exception e) {
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                // TODO: handle exception
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                Log.e("meidaplayer err ", e.toString());
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            }
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            /**
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             * 播放器異常事件
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             */
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            mediaPlayer.setOnErrorListener(new OnErrorListener() {
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                @Override
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                public boolean onError(MediaPlayer mp, int what, int extra) {
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                    // TODO Auto-generated method stub
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                    mediaPlayer.release();
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                    return false;
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                }
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            });
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                        //視頻准備完成 可以播放
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            mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
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                @Override
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                public void onPrepared(MediaPlayer mp) {
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                    // TODO Auto-generated method stub
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                    try {
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                        mp.start();
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                                                <span style="color:#e53333;">//給ui 界面發送消息 這裡有個延時是設置 如果不設置延時 會出現 獲得視頻的高寬為零的文件</span>                       
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uiHandler.sendEmptyMessageDelayed(MediaPlayerMessage.SETSIZE, 1000);
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                    } catch (Exception e) {
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                        // TODO: handle exception
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                        Log.e("start mediaplayer", e.toString());
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                    }
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                }
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            });
view sourceprint?
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<pre class="brush:java; toolbar: true; auto-links: false;">    case MediaPlayerMessage.SETSIZE:
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        int mVideoWidth = mediaPlayerView.mediaPlayer.getVideoWidth();
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        int mVideoHeight = mediaPlayerView.mediaPlayer.getVideoHeight();
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        int width=_frameLayout_main.getWidth();
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    int height=_frameLayout_main.getHeight();
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    <span style="color:#e53333;">android.widget.LinearLayout.LayoutParams sufaceviewParams = (android.widget.LinearLayout.LayoutParams) mediapaly_sufaceview
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                            .getLayoutParams();</span>  if ( mVideoWidth * height  > width * mVideoHeight ) {
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        //Log.i("@@@", "image too tall, correcting");
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        sufaceviewParams.height = width * mVideoHeight / mVideoWidth;
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        } else if ( mVideoWidth * height  < width * mVideoHeight ) {
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        //Log.i("@@@", "image too wide, correcting");
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        sufaceviewParams.width = height * mVideoWidth / mVideoHeight;
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        }else{
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                sufaceviewParams.height=height;
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                sufaceviewParams.width = width;
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         }
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    sufaceviewParams.gravity=Gravity.CENTER;
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    mediapaly_sufaceview.setLayoutParams(sufaceviewParams);
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    break;</pre><p> </p>
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<span style="color:#e53333;">//更在 surface 大小後事件</span>  @Override
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    public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
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        // TODO Auto-generated method stub www.2cto.com
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        Log.e("Surface h w", String.valueOf(arg2) + " " + String.valueOf(arg3));
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        if (mediaPlayer != null) {
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            <span style="color:#e53333;">mediaPlayer.setDisplay(arg0);</span>       }
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    }<br>