Graphics-----Matrix ScaleToFit

1.? Matrix.ScaleToFit

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new Matrix.ScaleToFit[] {            Matrix.ScaleToFit.FILL,            Matrix.ScaleToFit.START,            Matrix.ScaleToFit.CENTER,            Matrix.ScaleToFit.END        };

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 private void drawFit(Canvas canvas, int index, Matrix.ScaleToFit stf) {            canvas.save();                        setSrcR(index);            mMatrix.setRectToRect(mSrcR, mDstR, stf);            canvas.concat(mMatrix);            drawSrcR(canvas, index);                        canvas.restore();                        canvas.drawRect(mDstR, mHairPaint);        }