问如何在android中实现一个画笔大小

EN

  RelativeLayout.LayoutParams params3 = 
                new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.FILL_PARENT,
                    RelativeLayout.LayoutParams.WRAP_CONTENT);      
            params3.addRule(RelativeLayout.ABOVE, RemindButton.getId());
            WidthBar = new SeekBar(this);
            WidthBar.setMax(70);
            WidthBar.setProgress(15);
            WidthBar.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {

                @Override
                public void onStopTrackingTouch(SeekBar seekBar) {


                }

                @Override
                public void onStartTrackingTouch(SeekBar seekBar) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void onProgressChanged(SeekBar seekBar, int progress,
                        boolean fromUser) {
                    if (fromUser)
                    mPaint.setStrokeWidth(progress); //Change StrokeWidth       
                }
            });
 LL.addView(WidthBar,params3);