| private StringBuffer sb=new StringBuffer(); //定义一个StringBuffer用来保存输入的数字 private int len=4; //想输入的数字的长度 private int temp; //取数字 protected void paint(Graphics g) { g.setColor(WHITE); g.fillRect(0,0,getWidth(),getHeight()); g.setColor(BLACK); g.drawString(sb.toString(),getWidth()/2,getHeight()/2,Graphics.TOP|Graphics.HCENTER); //显示输入内容 } protected void keyPressed(int keynum) { if (sb.length()==len) //开始键功能描述 { switch (keynum) { case KEY_STAR: temp=Integer.parseInt(sb.toString()); //得到了屏幕中输入的数字 接下来自己可以利用数字按下*开始动能 break; default: break; } } if (sb.length() { switch (keynum) { case KEY_NUM1: sb.append("1"); break; case KEY_NUM2: sb.append("2"); break; case KEY_NUM3: sb.append("3"); break; case KEY_NUM4: sb.append("4"); break; case KEY_NUM5: sb.append("5"); break; case KEY_NUM6: sb.append("6"); break; case KEY_NUM7: sb.append("7"); break; case KEY_NUM8: sb.append("8"); break; case KEY_NUM9: sb.append("9"); break; case KEY_NUM0: sb.append("0"); break; default: break; } } if(sb.length()>0) //退格键函数描述 { if(keynum==KEY_POUND) sb.deleteCharAt(sb.length()-1); } repaint(); } protected void keyReapeated(int keynum) { if(sb.length()>0) //长按一次性去除建函数描述 if(keynum==KEY_POUND) sb=null; } repaint(); } |
