标签:cbe 图片 注意 call def 尺寸 main art lin
问题缘由:
最近准备封装一个视频播放器,我采用了SurfaceView + MediaPlayer的方式。
视频加载显示画面后遇到问题:“视频画面扭曲,比例变形。”
问题截图:
解决思路:
视频尺寸会自动填充surfaceView,所以想要调整视频尺寸 修改surfaceView就好了。
通过监听mediaplayer的回调函数“onVideoSizeChanged” 在里面修改surfaceView的宽高。
changeVideoSize
public void changeVideoSize() { int videoWidth = mediaPlayer.getVideoWidth(); int videoHeight = mediaPlayer.getVideoHeight(); //根据视频尺寸去计算->视频可以在sufaceView中放大的最大倍数。 float max; if (getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { //竖屏模式下按视频宽度计算放大倍数值 max = Math.max((float) videoWidth / (float) surfaceWidth,(float) videoHeight / (float) surfaceHeight); } else{ //横屏模式下按视频高度计算放大倍数值 max = Math.max(((float) videoWidth/(float) surfaceHeight),(float) videoHeight/(float) surfaceWidth); } //视频宽高分别/最大倍数值 计算出放大后的视频尺寸 videoWidth = (int) Math.ceil((float) videoWidth / max); videoHeight = (int) Math.ceil((float) videoHeight / max); //无法直接设置视频尺寸,将计算出的视频尺寸设置到surfaceView 让视频自动填充。 surfaceView.setLayoutParams(new RelativeLayout.LayoutParams(videoWidth, videoHeight)); }
注意:surfaceView的尺寸需要记录保存为固定值,否则在屏幕旋转后尺寸会变动。
效果截图:
完整代码:
public class MainActivity extends AppCompatActivity implements SurfaceHolder.Callback, MediaPlayer.OnVideoSizeChangedListener { private SurfaceView surfaceView; private MediaPlayer mediaPlayer; private int surfaceWidth; private int surfaceHeight; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //初始化页面/对象/变量/监听事件 setContentView(R.layout.activity_main); surfaceView = (SurfaceView) findViewById(R.id.surfaceView); surfaceView.getHolder().addCallback(this); } private void playVideo(String url) { try { mediaPlayer.setDataSource(this, Uri.parse(url)); mediaPlayer.prepare(); mediaPlayer.start();} catch (IOException e) {e.printStackTrace();} } @Override public void surfaceCreated(SurfaceHolder surfaceHolder) { mediaPlayer = new MediaPlayer(); mediaPlayer.setOnVideoSizeChangedListener(this); mediaPlayer.setDisplay(surfaceHolder);
if(getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT){ surfaceWidth=surfaceView.getWidth(); surfaceHeight=surfaceView.getHeight(); }else { surfaceWidth=surfaceView.getHeight(); surfaceHeight=surfaceView.getWidth(); } playVideo("http://pgccdn.v.baidu.com/258500786_2854944371_20171201122626.mp4?authorization=bce-auth-v1%2Fc308a72e7b874edd9115e4614e1d62f6%2F2017-12-01T04%3A26%3A31Z%2F-1%2F%2Fcbe73c8f603a65a23a019236ad32c090ba08f587acae4011d388f153d912724f&responseCacheControl=max-age%3D8640000&responseExpires=Sun%2C+11+Mar+2018+12%3A26%3A31+GMT&xcode=0d70b526aeacd2423ca650defc16c18d96d564747874148f&time=1512191597&_=1512108201312"); } @Override public void surfaceChanged(SurfaceHolder surfaceHolder, int i, int i1, int i2) { } @Override public void surfaceDestroyed(SurfaceHolder surfaceHolder) { mediaPlayer.release(); mediaPlayer=null; } public void changeVideoSize() { int videoWidth = mediaPlayer.getVideoWidth(); int videoHeight = mediaPlayer.getVideoHeight(); //根据视频尺寸去计算->视频可以在sufaceView中放大的最大倍数。 float max; if (getResources().getConfiguration().orientation==ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) { //竖屏模式下按视频宽度计算放大倍数值 max = Math.max((float) videoWidth / (float) surfaceWidth,(float) videoHeight / (float) surfaceHeight); } else{ //横屏模式下按视频高度计算放大倍数值 max = Math.max(((float) videoWidth/(float) surfaceHeight),(float) videoHeight/(float) surfaceWidth); } //视频宽高分别/最大倍数值 计算出放大后的视频尺寸 videoWidth = (int) Math.ceil((float) videoWidth / max); videoHeight = (int) Math.ceil((float) videoHeight / max); //无法直接设置视频尺寸,将计算出的视频尺寸设置到surfaceView 让视频自动填充。 surfaceView.setLayoutParams(new RelativeLayout.LayoutParams(videoWidth, videoHeight)); } @Override public void onVideoSizeChanged(MediaPlayer mp, int width, int height) { changeVideoSize(); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); changeVideoSize(); } }
最后,在此希望大家能够提供其它算法,应该会有更好的。
标签:cbe 图片 注意 call def 尺寸 main art lin
原文地址:http://www.cnblogs.com/cx98/p/7942886.html