將下圖檔案中的  deliverAndDrawFrame 方法

修改為

protected void deliverAndDrawFrame(CvCameraViewFrame frame){
    Mat modified;

    if (mListener != null) {
        modified = mListener.onCameraFrame(frame);
    } else {
       

modified = frame.rgba();
    }

    boolean bmpValid = true;
    if (modified!= null) {
        try {
            Utils.matToBitmap(modified,mCacheBitmap);
        } catch(Exceptione) {
            Log.e(TAG, "Mattype: " + modified);
            Log.e(TAG, "Bitmaptype: " + mCacheBitmap.getWidth() + "*" + mCacheBitmap.getHeight());
            Log.e(TAG, "Utils.matToBitmap()throws an exception: " +e.getMessage());
            bmpValid = false;
        }
    }

    if (bmpValid&& mCacheBitmap != null) {
        Canvas canvas =getHolder().lockCanvas();
        if (canvas!= null) {
            canvas.drawColor(0,android.graphics.PorterDuff.Mode.CLEAR);
            /*if (BuildConfig.DEBUG)
                Log.d(TAG, "mStretchvalue: " + mScale);

            if (mScale != 0) {
               canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(),mCacheBitmap.getHeight()),
                     newRect((int)((canvas.getWidth() - mScale*mCacheBitmap.getWidth()) / 2),
                    (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2),
                     (int)((canvas.getWidth() -mScale*mCacheBitmap.getWidth()) / 2 + mScale*mCacheBitmap.getWidth()),
                    (int)((canvas.getHeight() - mScale*mCacheBitmap.getHeight()) / 2 +mScale*mCacheBitmap.getHeight())), null);
            } else {
                canvas.drawBitmap(mCacheBitmap, new Rect(0,0,mCacheBitmap.getWidth(),mCacheBitmap.getHeight()),
                     newRect((canvas.getWidth() - mCacheBitmap.getWidth()) / 2,
                     (canvas.getHeight()- mCacheBitmap.getHeight()) / 2,
                     (canvas.getWidth() -mCacheBitmap.getWidth()) / 2 + mCacheBitmap.getWidth(),
                     (canvas.getHeight()- mCacheBitmap.getHeight()) / 2 + mCacheBitmap.getHeight()), null);
            }*/

            /*----------------------------修改預覽旋轉90度問題--------------------------------*/
            canvas.rotate(90,0,0);
            float scale= canvas.getWidth() / (float)mCacheBitmap.getHeight();
            float scale2= canvas.getHeight() / (float)mCacheBitmap.getWidth();
            if(scale2> scale){
                scale = scale2;
            }
            if (scale!= 0) {
                canvas.scale(scale,scale,0,0);
            }
            canvas.drawBitmap(mCacheBitmap, 0, -mCacheBitmap.getHeight(), null);
            /*----------------------------修改預覽旋轉90度問題--------------------------------*/

            if (mFpsMeter != null) {
                mFpsMeter.measure();
                mFpsMeter.draw(canvas, 20, 30);
            }
            getHolder().unlockCanvasAndPost(canvas);
        }
    }
}