qq_34307035
qq_34307035
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2016-03-16 00:41 阅读 3.6k

安卓开发 eclipse 计算器模型

怎么做在eclipse安卓 里制作一个计算器APP,在虚拟机里出现能实现加减乘除等简单的运算

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2条回答 默认 最新

  • 已采纳
    lihai112 Lianpit 2016-03-16 00:55

    给你一个以前写好的,仅供参考
    import java.awt.BorderLayout;
    import java.awt.GridLayout;
    import java.awt.event.MouseEvent;
    import java.awt.event.MouseListener;
    import java.text.DecimalFormat;

    import javax.swing.JButton;
    import javax.swing.JFrame;
    import javax.swing.JPanel;
    import javax.swing.JTextField;

    public class Calculator {
    //计算器面板
    private JFrame f = new JFrame("Calculator");
    //输入面扳
    private JPanel inputPanel = new JPanel();
    //加减乘除面板
    private JPanel operationPanel = new JPanel();
    //数字面板
    private JPanel buttonsPanel = new JPanel();

    //输入数据文本框
    private JTextField input = new JTextField(20);
    
    //退格键
    private JButton backspace = new JButton("BackSpace");
    //清空
    private JButton CE = new JButton("CE  ");
    //删除
    private JButton C = new JButton("C  ");
    
    //四则运算符号键
    private JButton add = new JButton("+");
    private JButton sub = new JButton("-");
    private JButton mul = new JButton("*");
    private JButton div = new JButton("/");
    
    //小数点
    private JButton decimal = new JButton(".");
    //等号
    private JButton equal = new JButton("=");
    
    //数字键
    private JButton zero = new JButton("0");
    private JButton one = new JButton("1");
    private JButton two = new JButton("2");
    private JButton three = new JButton("3");
    private JButton four = new JButton("4");
    private JButton five = new JButton("5");
    private JButton six = new JButton("6");
    private JButton seven = new JButton("7");
    private JButton eight = new JButton("8");
    private JButton nine = new JButton("9");
    
    private String num1 = "";//保存第一个运算数字
    private String operator = "";//保存运算符号
    
    public static void main(String[] args) {
        new Calculator();//new计算器实例
    }
    
    public Calculator(){
         //添加组件,布局
        inputPanel.add(input);
        f.add(inputPanel, BorderLayout.NORTH);
    
        operationPanel.add(backspace);
        operationPanel.add(CE);
        operationPanel.add(C);
        f.add(operationPanel, BorderLayout.CENTER);
    
        buttonsPanel.add(add);
        buttonsPanel.add(sub);
        buttonsPanel.add(mul);
        buttonsPanel.add(div);
        buttonsPanel.add(one);
        buttonsPanel.add(two);
        buttonsPanel.add(three);
        buttonsPanel.add(zero);
        buttonsPanel.add(four);
        buttonsPanel.add(five);
        buttonsPanel.add(six);
        buttonsPanel.add(decimal);
        buttonsPanel.add(seven);
        buttonsPanel.add(eight);
        buttonsPanel.add(nine);
        buttonsPanel.add(equal);
        buttonsPanel.setLayout(new GridLayout(4, 4));
        f.add(buttonsPanel, BorderLayout.SOUTH);
    
        //注册各个组件监听事件
        backspace.addMouseListener(new OperationMouseListener());
        CE.addMouseListener(new OperationMouseListener());
        C.addMouseListener(new OperationMouseListener());
        decimal.addMouseListener(new OperationMouseListener());
        equal.addMouseListener(new OperationMouseListener());
    
        //注册四则运算监听
        add.addMouseListener(new CalcMouseListener());
        sub.addMouseListener(new CalcMouseListener());
        mul.addMouseListener(new CalcMouseListener());
        div.addMouseListener(new CalcMouseListener());
    
        //注册数字监听事件
        zero.addMouseListener(new NumberMouseListener());
        one.addMouseListener(new NumberMouseListener());
        two.addMouseListener(new NumberMouseListener());
        three.addMouseListener(new NumberMouseListener());
        four.addMouseListener(new NumberMouseListener());
        five.addMouseListener(new NumberMouseListener());
        six.addMouseListener(new NumberMouseListener());
        seven.addMouseListener(new NumberMouseListener());
        eight.addMouseListener(new NumberMouseListener());
        nine.addMouseListener(new NumberMouseListener());
    
        f.setVisible(true);
        f.pack();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    private class NumberMouseListener implements MouseListener{
    
        public void mouseClicked(MouseEvent e) {
            if(input.getText().trim().equals("0")){//如果文本框已经是0,结果还是0
                input.setText(((JButton)e.getSource()).getText().trim());
            }else{//否则的话,把0添加到后面,譬如文本框是1,结果就为10
                input.setText(input.getText().concat(((JButton)e.getSource()).getText().trim()));
            }
        }
    
        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {}
        public void mouseReleased(MouseEvent e) {}  
    }
    
    private class CalcMouseListener implements MouseListener{
        //如果输入的是运算符号,保存第一个结果和运算符号
        public void mouseClicked(MouseEvent e) {
            num1 = input.getText().trim();input.setText("");
            operator = ((JButton)e.getSource()).getText().trim();
        }
    
        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {}
        public void mouseReleased(MouseEvent e) {}  
    }
    
    private class OperationMouseListener implements MouseListener{
    
        public void mouseClicked(MouseEvent e) {
            if(e.getSource() == backspace){//退格键,删除一个直到没有字符删除
                String inputText = input.getText();
                if(inputText.length() > 0){
                    input.setText(inputText.substring(0, inputText.length() - 1));
                }
            }else if(e.getSource() == C){
                input.setText("0");//C,清空所有运算数字和符号
                num1 = "";
            }else if(e.getSource() == CE){
                input.setText("0");//CE-->将文本框置为0
            }else if(e.getSource() == decimal){
                String text = input.getText().trim();
                //如果按了小数点,如果文本框已经有小数点,不做任何操作,否则在结果后面加上小数点
                if(text.indexOf(".") == -1){
                    input.setText(text.concat("."));
                }
            }else if(e.getSource() == equal){
                //如果是等号
                if(!operator.trim().equals("")){
                    if(!input.getText().trim().equals("")){
                        double result = 0D;
                        if(operator.equals("+")){//执行加法运算
                            result = Double.parseDouble(num1) + Double.parseDouble(input.getText().trim());
                        }else if(operator.equals("-")){//减法运算
                            result = Double.parseDouble(num1) - Double.parseDouble(input.getText().trim());
                        }else if(operator.equals("*")){//乘法运算
                            result = Double.parseDouble(num1) * Double.parseDouble(input.getText().trim());
                        }else if(operator.equals("/")){//除法运算
                            result = Double.parseDouble(num1) / Double.parseDouble(input.getText().trim());
                        }
    
                         //格式化最终结果,保留两位小数点
                        input.setText(new DecimalFormat("0.00").format(result));
                    }
                }
    
            }
    
        }
    
        public void mouseEntered(MouseEvent e) {}
        public void mouseExited(MouseEvent e) {}
        public void mousePressed(MouseEvent e) {}
        public void mouseReleased(MouseEvent e) {}  
    }
    

    }

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  • dongfeng9ge 东风玖哥 2016-03-16 04:54

    题主你百度一下“easyUI 计算器”

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