保存bitmap对象到SD卡

public static void saveBitmapToSDCard(Bitmap bitmap,String imagename)   
	{   
	    FileOutputStream fos = null;   
	    try {   
	        fos = new FileOutputStream("/sdcard/Images/" + "img-"+imagename + ".jpg"); 
	        if (fos != null) {
	        	bitmap.compress(Bitmap.CompressFormat.JPEG, 90, fos);   
	            fos.close();   
	        }   
	    } catch (Exception e) {   
	        e.printStackTrace();   
	    }   
	}