EXOPlayer居中播放，类似ImageView的CENTER_CROP

1、自定义TextureView

import android.content.Context;import android.graphics.Matrix;import android.util.AttributeSet;import android.view.TextureView;/** * 视频自动居中裁剪自定义TextureView */public class TextureVideoView extends TextureView{    private float mVideoHeight;    private float mVideoWidth;    private ScaleType mScaleType;    public enum ScaleType {        CENTER_CROP, TOP, BOTTOM    }    public void setWH(float mVideoWidth,float mVideoHeight){        this.mVideoWidth=mVideoWidth;        this.mVideoHeight=mVideoHeight;        updateTextureViewSize();    }    public TextureVideoView(Context context) {        super(context);        initView();    }    public TextureVideoView(Context context, AttributeSet attrs) {        super(context, attrs);        initView();    }    public TextureVideoView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        initView();    }    private void initView() {        setScaleType(ScaleType.CENTER_CROP);    }    public void setScaleType(ScaleType scaleType) {        mScaleType = scaleType;    }    private void updateTextureViewSize() {        float sx = (float) getWidth() / mVideoWidth;        float sy = (float) getHeight() / mVideoHeight;        Matrix matrix = new Matrix();        float maxScale = Math.max(sx, sy);        //第1步:把视频区移动到View区,使两者中心点重合.        matrix.preTranslate((getWidth() - mVideoWidth) / 2, (getHeight() - mVideoHeight) / 2);        //第2步:因为默认视频是fitXY的形式显示的,所以首先要缩放还原回来.        matrix.preScale(mVideoWidth / (float) getWidth(), mVideoHeight / (float) getHeight());        //第3步,等比例放大或缩小,直到视频区的一边超过View一边, 另一边与View的另一边相等. 因为超过的部分超出了View的范围,所以是不会显示的,相当于裁剪了.        matrix.postScale(maxScale, maxScale, getWidth() / 2, getHeight() / 2);//后两个参数坐标是以整个View的坐标系以参考的        setTransform(matrix);    }}

二、设置mTextureVideoView.setScaleType(TextureVideoView.ScaleType.CENTER_CROP);属性

三、当获取到视频的宽高时mTextureVideoView.setWH()

注：Exo获取视频宽高方法：

player.setVideoListener(new SimpleExoPlayer.VideoListener() {            public void onVideoSizeChanged(int width, int height, int unappliedRotationDegrees, float pixelWidthHeightRatio) {              //视频宽和高            }            @Override            public void onRenderedFirstFrame() {            }        });    }

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