Picture专成Bitmap并保存到sd卡

Bitmap  b = Bitmap.createBitmap( picture.getWidth(), picture.getHeight(), Bitmap.Config.ARGB_8888); 
                Canvas c = new Canvas( b ); 
                picture.draw( c ); 
                FileOutputStream fos = null; 
                try { 
                        fos = new FileOutputStream( "/sdcard/yahoo_" + 
System.currentTimeMillis() + ".jpg" );                         if ( fos != null ) 
                        { 
                                b.compress(Bitmap.CompressFormat.JPEG, 90, fos );                                 fos.close(); 
                        }                 } catch( Exception e ) 
                        { 
                        //... 
                        } 
                } 
          });