AndroidStudio编写简易计算器_as做计算器

作者：小小林熬夜学编程 | 2024-04-16 04:23:55

踩

as做计算器

最近想着用AS做一个简单好看的计算器拿来玩玩
界面如下：
在这里插入图片描述

在这里插入图片描述
Android项目目录结构如下图所示：

布局文件activity_main.xml示例图：

布局文件activity_main.xml完整代码如下：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#cacaca"
    android:orientation="vertical"
    tools:context=".MainActivity">
    <!--标题及结果框-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1.23"
        android:orientation="vertical"
        android:background="@drawable/frame"
        android:weightSum="1">
        <TextView
            android:id="@+id/id_input"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.50"
            android:textSize="31sp"
            android:textColor="#2E2E2E"
            android:gravity="right" />

        <TextView
            android:id="@+id/id_result"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_weight="0.50"

            android:textSize="31sp"
            android:textColor="#2E2E2E"
            android:gravity="right" />
    </LinearLayout>
    <!--按键-->
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="3">
        <TableLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">
            <TableRow android:layout_weight="1">
                <Button
                    android:id="@+id/btn_clear"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="AC"
                    android:textColor="#C106FF"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_delete"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="Del"
                    android:textAllCaps="false"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_percent"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="%"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_divide"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="÷"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
            </TableRow>
            <TableRow android:layout_weight="1">
                <Button
                    android:id="@+id/btn_7"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="7"
                    android:onClick="xml_OnClick"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_8"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="8"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_9"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:onClick="xml_OnClick"
                    android:background="@drawable/selector_1"
                    android:text="9"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_mul"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="×"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
            </TableRow>
            <TableRow android:layout_weight="1">
                <Button
                    android:id="@+id/btn_4"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="4"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_5"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="5"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_6"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="6"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_sub"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="-"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
            </TableRow>
            <TableRow android:layout_weight="1">
                <Button
                    android:id="@+id/btn_1"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="1"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_2"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="2"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_3"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="3"
                    android:textColor="#6f7480"
                    android:onClick="xml_OnClick"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_add"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="+"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
            </TableRow>
            <TableRow android:layout_weight="1">
                <Button
                    android:id="@+id/re"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="退出"
                    android:textAllCaps="false"
                    android:textColor="#C106FF"
                    android:textSize="25sp" />
                <Button
                    android:id="@+id/btn_0"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="0"
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_dot"
                    android:onClick="xml_OnClick"
                    android:layout_width="0dp"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_vertical"
                    android:layout_weight="1"
                    android:background="@drawable/selector_1"
                    android:text="."
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
                <Button
                    android:id="@+id/btn_equals"
                    android:layout_width="0dp"
                    android:onClick="xml_OnClick"
                    android:layout_height="match_parent"
                    android:layout_gravity="center_horizontal"
                    android:layout_weight="1"
                    android:background="@drawable/selector_2"
                    android:text="="
                    android:textColor="#6f7480"
                    android:textSize="30sp" />
            </TableRow>
        </TableLayout>
    </LinearLayout>
</LinearLayout>
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MainActivity代码如下：

package com.example.xiaomi_cal;

import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.text.DecimalFormat;
import java.util.LinkedList;
import java.util.Queue;
import java.util.Stack;

public class MainActivity extends AppCompatActivity {

    private TextView input;
    private TextView result;
    private StringBuilder str = new StringBuilder();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        input = (TextView) findViewById(R.id.id_input);
        result = (TextView) findViewById(R.id.id_result);

        Button bt_re=(Button)findViewById(R.id.re);
        bt_re.setOnClickListener(new MyonClick(){
            @Override
            public void onClick(View v){
                AlertDialog.Builder mDialog = new AlertDialog.Builder(MainActivity.this);
                mDialog.setTitle("退出");
                mDialog.setMessage("确定要退出吗?");
                mDialog.setPositiveButton("确定",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int which) {
                                System.exit(0);
                            }
                        });
                mDialog.setNegativeButton("取消", null);
                mDialog.show();
            }
        });
    }
    class MyonClick implements View.OnClickListener{
        @Override
        public void onClick(View view) {
            }
        }

    private void symbolSolve(String s) {
        int len = str.length();
        switch (s) {
            case "-":
                if (len == 0) {
                    str.append("-");
                    return;
                }
                if (str.charAt(len - 1) == '*' || str.charAt(len - 1) == '/') {
                    str.append(s);
                } else if (isOperator(str.charAt(len - 1) + "")) {
                    str.replace(len - 1, len, s);
                } else {
                    str.append(s);
                }
                break;
            case "+":
            case "*":
            case "/":
                if (len == 0) return;
                if (isOperator(str.charAt(len - 1) + "")) {
                    str.replace(len - 1, len, s);
                } else {
                    str.append(s);
                }
                break;
        }
    }

    public void xml_OnClick(View view) {
        try {
            switch (view.getId()) {
                case R.id.btn_clear:
                    tvClear(input, result);
                    str.setLength(0);
                    break;
                case R.id.btn_delete:
                    int len = str.length();
                    if (len == 0) return;
                    input.setText(str.deleteCharAt(len - 1));
                    break;

                case R.id.btn_add:
                    symbolSolve("+");
                    input.setText(str);
                    return;
                case R.id.btn_sub:
                    symbolSolve("-");
                    input.setText(str);
                    return;
                case R.id.btn_mul:
                    symbolSolve("*");
                    input.setText(str);
                    return;
                case R.id.btn_divide:
                    symbolSolve("/");
                    input.setText(str);
                    return;

                case R.id.btn_equals:
                    if (str.length() == 0) return;
                    if (str.length() == 1 && str.charAt(0) == '-') return;
                    DecimalFormat df = new DecimalFormat("###.###############");
                    String num = null;
                    double d = calculate(str.toString());
                    if (Double.isNaN(d) || Double.isInfinite(d)) {
                        result.setText("不能除以0");
                    } else {
                        try {
                            num = df.format(d);
                        } catch (Exception e) {
                            System.out.println("错误！");
                        }
                        result.setText("-0".equals(num) ? "0" : num);
                    }
                    result.setTextColor(Color.parseColor("#C106FF"));
                    result.setTextSize(39);
                    return;

                case R.id.btn_dot:
                    str.append(".");
                    break;
                case R.id.btn_0:
                    str.append("0");
                    break;
                case R.id.btn_1:
                    str.append("1");
                    break;
                case R.id.btn_2:
                    str.append("2");
                    break;
                case R.id.btn_3:
                    str.append("3");
                    break;
                case R.id.btn_4:
                    str.append("4");
                    break;
                case R.id.btn_5:
                    str.append("5");
                    break;
                case R.id.btn_6:
                    str.append("6");
                    break;
                case R.id.btn_7:
                    str.append("7");
                    break;
                case R.id.btn_8:
                    str.append("8");
                    break;
                case R.id.btn_9:
                    str.append("9");
                    break;
            }
            input.setText(str);

            int len = str.length();
            if (len != 0) {
                DecimalFormat df = new DecimalFormat("###.###############");
                String num = null;
                double d = calculate(str.toString());
                if (Double.isNaN(d) || Double.isInfinite(d)) {
                    result.setText("不能除以0");
                } else {
                    try {
                        num = df.format(d);
                    } catch (Exception e) {
                        System.out.println("错误！");
                    }
                    result.setText("-0".equals(num) ? "0" : num);
                }
            }
        } catch (NumberFormatException e) {
            result.setText("错误");
            e.printStackTrace();
        }
    }

    private boolean isOperator(String s) {
        return s.equals("+") ||
                s.equals("-") ||
                s.equals("*") ||
                s.equals("/");
    }

    private void tvClear(TextView input, TextView result) {
        input.setText("");
        result.setText("");
        result.setTextColor(Color.parseColor("#FFC0CB"));
        result.setTextSize(26);
    }

    private double calculate(String s) {
        Queue<String> q = getPostfixExpression(s); // 中缀表达式转为后缀表达式
        return calculatePostfixExpression(q);
    }

    Stack<Double> stack = new Stack<>();

    private double calculatePostfixExpression(Queue<String> queue) {
        stack.clear();
        int len = queue.size();
        double num1 = 0.0, num2 = 0.0, num3 = 0.0;
        for (int i = 0; i < len; ++i) {
            String s = queue.poll();
            if (!isOperator(s)) {
                stack.push(Double.valueOf(s));
            } else {
                if (stack.isEmpty()) return 0.0;
                num2 = stack.pop();
                if (stack.isEmpty()) return num2;
                num1 = stack.pop();
                switch (s) {
                    case "+":
                        num3 = num1 + num2;
                        break;
                    case "-":
                        num3 = num1 - num2;
                        break;
                    case "*":
                        num3 = num1 * num2;
                        break;
                    case "/":
                        num3 = num1 / num2;
                        break;
                }
                stack.push(num3);
            }
        }
        return stack.peek();
    }

    Stack<Character> stack2 = new Stack<>();
    Queue<String> queue2 = new LinkedList<>();
    StringBuilder strNum = new StringBuilder();

    // 获得后缀表达式
    public Queue<String> getPostfixExpression(String s) {
        stack2.clear();
        int len = s.length();
        strNum.setLength(0);
        queue2.clear();
        char temp = ' ';
        for (int i = 0; i < len; ++i) {
            temp = str.charAt(i);
            if (temp >= '0' && temp <= '9' || temp == '.') {
                strNum.append(temp);
            } else {
                if (i == 0 || isOperator(str.charAt(i - 1) + "")) {
                    // 考虑负数的情况，比如乘以除以负数
                    strNum.append(temp);
                    continue;
                }
                queue2.add(strNum.toString()); // 数字进队列
                strNum.setLength(0);
                if (stack2.isEmpty()) {
                    stack2.push(temp);
                } else {
                    while (!stack2.isEmpty()) {
                        char top = stack2.peek();
                        if (getPriority(top) >= getPriority(temp)) {
                            queue2.add(top + "");
                            stack2.pop();
                        } else {
                            break;
                        }
                    }
                    stack2.push(temp);
                }
            }
        }
        if (strNum.length() != 0) {
            queue2.add(strNum.toString()); // 数字进队列
        }
        if (stack2.isEmpty()) {
            stack2.push(temp);
        } else {
            while (!stack2.isEmpty()) {
                char top = stack2.peek();
                queue2.add(top + "");
                stack2.pop();
            }
        }
        return queue2;
    }

    private int getPriority(char top) {
        if (top == '+' || top == '-')
            return 1;
        return 2; // 只有加减乘除
    }
}

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想要完整源码的可以下载，我把整个项目上传了，欢迎大家下载：https://download.csdn.net/download/qq_44394562/19087725

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