AndroidStudio实现简单计算器

最新推荐文章于 2025-06-19 10:24:40 发布

grapes1234

最新推荐文章于 2025-06-19 10:24:40 发布

阅读量1k

点赞数 1

CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/grapes1234/article/details/88586384

本文介绍了如何在Android Studio中实现一个简单的计算器应用。通过遵循教程和参考网上资源，作者克服了遇到的问题，并提升了对软件的熟悉度。强调了多实践以增强技能的重要性。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

运行后画面布局：

Java代码：

package com.example.admin.caculator;
import java.util.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
 
/**
 * @author yiyi
 * 可能有些许Bug，烦请指正。
 *
 *
 */
 
public class MainActivity extends AppCompatActivity {
    private int[] idNum = {R.id.txt0, R.id.txt1, R.id.txt2, R.id.txt3,
            R.id.txt4, R.id.txt5, R.id.txt6, R.id.txt7, R.id.txt8, R.id.txt9};  //数字Number输入
    private int[] idCal = {R.id.txtPlus, R.id.txtMinus, R.id.txtMul, R.id.txtDiv,R.id.txtLeft,R.id.txtRight,R.id.txtDot};  //运算符
    private Button[] buttonsCal = new Button[idCal.length];
    private Button[] buttonsNum = new Button[idNum.length];
    private Button buttonEqu;   //=
    private Button buttonClear;  // AC
    private Button buttonDel;
    private EditText input ;
    private TextView output;
    private static String Text;
    @Override
    /**
     * EditText为输入字符行，
     * TextView为结果。
     */
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        input = (EditText)findViewById(R.id.input);
        input.setText("");
        input.setEnabled(false);
        output = (TextView) findViewById(R.id.output);
        output.setText("");
        buttonEqu = (Button)findViewById(R.id.txtIs);
        buttonEqu.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                output.setText(new Calculate(input.getText().toString()).str);
            }
        });
        buttonClear = (Button) findViewById(R.id.txtClear);
        buttonClear.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                input.setText("");
                output.setText("");
            }
        });
        buttonDel = (Button) findViewById(R.id.txtDel);
 
        buttonDel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
 
               if (!input.getText().toString().isEmpty() ) {
                    Text = input.getText().toString();
                    Text = Text.substring(0, Text.length() - 1);
                    input.setText(Text);
                }
            }
        });
/**
 * 注册单击事件
 */
        for (int idcal = 0; idcal < idCal.length; idcal++) {
            buttonsCal[idcal] = (Button) findViewById(idCal[idcal]);
            buttonsCal[idcal].setOnClickListener(new CalOnClick(buttonsCal[idcal].getText().toString()));
 
        }
        for (int i = 0; i < idNum.length; i++) {
            buttonsNum[i] = (Button) findViewById(idNum[i]);
            buttonsNum[i].setOnClickListener(new NumberOnClick(buttonsNum[i].getText().toString()));
        }
 
 
 
 
    }
    //继承OnClick接口
    class NumberOnClick implements View.OnClickListener {
        String Msg;
        /**
         *
         * @param msg 点击按钮传入字符
         */
        public NumberOnClick(String msg) {
            Msg = msg;
        }
 
        @Override
        public void onClick(View v) {
            if (!output.getText().toString().equals("")) {
                input.setText("");
                output.setText("");
            }
 
            input.append(Msg);
        }
    }
    class CalOnClick implements  View.OnClickListener{
        String Msg;
        String[] calSymbol = {"+", "-", "*", "/","."};
        public CalOnClick(String msg) {
            Msg = msg;
        }
        @Override
        public void onClick(View v) {
            if (!output.getText().toString().equals("")) {
                input.setText("");
                output.setText("");
            }
            // 检查是否运算符重复输入
            for (int i = 0; i < calSymbol.le