如何获取SurfaceView中Canvas绘制出的图片

小弟在surfaceview组件上用canvas绘制出了一幅图片，即用方法SurfaceHolder的lockCanvas（）方法，和unlockCanvasAndPost（canvas）方法，用canvas画布绘制出了一幅图像，现想要将这图片保存下来，应该如何操作，请各位大神指导

package src.demo;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.view.SurfaceHolder;import android.view.SurfaceHolder.Callback;import android.view.SurfaceView;public class GameView extends SurfaceView{private Paint paint;private SurfaceHolder sf; public GameView(Context context) { super(context); sf =this.getHolder(); sf.addCallback(new Callback () { public void surfaceDestroyed(SurfaceHolder holder) { // TODO Auto-generated method stub } public void surfaceCreated(SurfaceHolder holder) { Canvas canvas = sf.lockCanvas(); paint = new Paint (); paint.setColor(Color.YELLOW); canvas.drawLine(0, 0, 100, 100, paint); sf.unlockCanvasAndPost(canvas); } public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) { // TODO Auto-generated method stub } }); }}

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