Android studio怎么制作简易计算器功能

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布局如下：

布局文件代码：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/mc"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".homework_3">

    <EditText
        android:id="@+id/editText"
        android:layout_width="match_parent"
        android:layout_height="110dp"
        android:ems="10"
        android:inputType="textPersonName"
        android:hint="请输入" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_mc"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="mc" />

        <Button
            android:id="@+id/button_mjia"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="m+" />

        <Button
            android:id="@+id/button_mjian"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="m-" />

        <Button
            android:id="@+id/button_mr"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="mr" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_c"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="c" />

        <Button
            android:id="@+id/button_xing"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="*" />

        <Button
            android:id="@+id/button_chu"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="/" />

        <Button
            android:id="@+id/button_xiaoyu"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="&lt;" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_7"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="7" />

        <Button
            android:id="@+id/button_8"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="8" />

        <Button
            android:id="@+id/button_9"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="9" />

        <Button
            android:id="@+id/button_jian"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="-" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1"
        android:orientation="horizontal">

        <Button
            android:id="@+id/button_4"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="4" />

        <Button
            android:id="@+id/button_5"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="5" />

        <Button
            android:id="@+id/button_6"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="6" />

        <Button
            android:id="@+id/button_jia"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_margin="2dp"
            android:layout_weight="1"
            android:insetTop="0dp"
            android:insetBottom="0dp"
            android:text="+" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="2"
        android:orientation="horizontal">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="3"
            android:orientation="horizontal">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:orientation="vertical">

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="horizontal">

                    <Button
                        android:id="@+id/button_1"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="2dp"
                        android:layout_weight="1"
                        android:insetTop="0dp"
                        android:insetBottom="0dp"
                        android:text="1" />

                    <Button
                        android:id="@+id/button_2"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="2dp"
                        android:layout_weight="1"
                        android:insetTop="0dp"
                        android:insetBottom="0dp"
                        android:text="2" />

                    <Button
                        android:id="@+id/button_3"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="2dp"
                        android:layout_weight="1"
                        android:insetTop="0dp"
                        android:insetBottom="0dp"
                        android:text="3" />
                </LinearLayout>

                <LinearLayout
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:orientation="horizontal">

                    <Button
                        android:id="@+id/button_0"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="2dp"
                        android:layout_weight="2"
                        android:insetTop="0dp"
                        android:insetBottom="0dp"
                        android:text="0" />

                    <Button
                        android:id="@+id/button_dian"
                        android:layout_width="0dp"
                        android:layout_height="match_parent"
                        android:layout_margin="2dp"
                        android:layout_weight="1"
                        android:insetTop="0dp"
                        android:insetBottom="0dp"
                        android:text="." />
                </LinearLayout>

            </LinearLayout>

        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <Button
                android:id="@+id/button_dengyu"
                android:layout_width="wrap_content"
                android:layout_height="match_parent"
                android:layout_margin="2dp"
                android:layout_weight="1"
                android:insetTop="0dp"
                android:insetBottom="0dp"
                android:text="=" />
        </LinearLayout>
    </LinearLayout>
</LinearLayout>

JAVA代码：

package com.example.a01_helloworld;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.os.Debug;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

import com.google.android.material.badge.BadgeUtils;

public class homework_3 extends AppCompatActivity implements View.OnClickListener{
    //创建button对象
    Button button_mc; //mc
    Button button_mjia; //m+
    Button button_mjian; //m-
    Button button_mr; //mr
    Button button_c; //c
    Button button_xing; //*
    Button button_chu; // /
    Button button_xiaoyu; // <
    Button button_7; // 7
    Button button_8; //8
    Button button_9; //9
    Button button_jian; // -
    Button button_4; // 4
    Button button_5; // 5
    Button button_6; // 6
    Button button_jia; // +
    Button button_1; // 1
    Button button_2; // 2
    Button button_3; // 3
    Button button_0; // 0
    Button button_dian; // .
    Button button_dengyu; // =
    EditText result;
    // 判断文本编辑框中是否清空
    boolean is_clear;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_homework_3);
        // 实例化对象
        button_mc = (Button)findViewById(R.id.button_mc);
        button_mjia = (Button)findViewById(R.id.button_mjia);
        button_mjian = (Button)findViewById(R.id.button_mjian);
        button_mr = (Button)findViewById(R.id.button_mr);
        button_c = (Button)findViewById(R.id.button_c);
        button_xing = (Button)findViewById(R.id.button_xing);
        button_chu = (Button)findViewById(R.id.button_chu);
        button_xiaoyu = (Button)findViewById(R.id.button_xiaoyu);
        button_7 = (Button)findViewById(R.id.button_7);
        button_8 = (Button)findViewById(R.id.button_8);
        button_9 = (Button)findViewById(R.id.button_9);
        button_jian = (Button)findViewById(R.id.button_jian);
        button_4 = (Button)findViewById(R.id.button_4);
        button_5 = (Button)findViewById(R.id.button_5);
        button_6 = (Button)findViewById(R.id.button_6);
        button_jia = (Button)findViewById(R.id.button_jia);
        button_1 = (Button)findViewById(R.id.button_1);
        button_2 = (Button)findViewById(R.id.button_2);
        button_3 = (Button)findViewById(R.id.button_3);
        button_0 = (Button)findViewById(R.id.button_0);
        button_dian = (Button)findViewById(R.id.button_dian);
        button_dengyu = (Button)findViewById(R.id.button_dengyu);
        result = (EditText)findViewById(R.id.editText);

        // 给按钮设置点击对象
        button_mc.setOnClickListener(this);
        button_mjia.setOnClickListener(this);
        button_mjian.setOnClickListener(this);
        button_mr.setOnClickListener(this);
        button_c.setOnClickListener(this);
        button_xing.setOnClickListener(this);
        button_chu.setOnClickListener(this);
        button_xiaoyu.setOnClickListener(this);
        button_7.setOnClickListener(this);
        button_8.setOnClickListener(this);
        button_9.setOnClickListener(this);
        button_jian.setOnClickListener(this);
        button_4.setOnClickListener(this);
        button_5.setOnClickListener(this);
        button_6.setOnClickListener(this);
        button_jia.setOnClickListener(this);
        button_1.setOnClickListener(this);
        button_2.setOnClickListener(this);
        button_3.setOnClickListener(this);
        button_0.setOnClickListener(this);
        button_dian.setOnClickListener(this);
        button_dengyu.setOnClickListener(this);

    }

    @Override
    public void onClick(View v) {
        String str = result.getText().toString();
        switch (v.getId()){
            case R.id.button_0:
            case R.id.button_1:
            case R.id.button_2:
            case R.id.button_3:
            case R.id.button_4:
            case R.id.button_5:
            case R.id.button_6:
            case R.id.button_7:
            case R.id.button_8:
            case R.id.button_9:
                if(result.length()==0){

                    str = "";
                    result.setText("");

                }

                result.setText(str+((Button)v).getText());
                break;


            case R.id.button_dian:
                if(result.length()==0){
                    return;
                }
                else {
                    Log.d("homework_3","aaa");
                    result.setText(str+((Button)v).getText());
                    break;
                }
            case R.id.button_xiaoyu:
                if (is_clear) {
                    is_clear =false ;
                    str ="" ;
                    result.setText("");
                }else if (str!=null&&!str.equals("")){
                    result.setText(str.substring(0,str.length()-1));
                }
                break;

            case R.id.button_jia:
            case R.id.button_jian:
            case R.id.button_xing:
            case R.id.button_chu:
                if (result.length()==0)
                {
                    str = "";
                    result.setText("");
                }
                result.setText(str+" "+((Button)v).getText()+" ");
                break;

            case R.id.button_c:
                is_clear = false;
                result.setText("");
            case R.id.button_dengyu:
                Log.d("homework_3","=");
                getResult();
                break;
        }

    }
    private void getResult(){
        String exp = result.getText().toString();
        if (exp==null||exp.equals(""))
        {
            return;
        }
        if(!exp.contains(" "))
        {
            return;
        }
        if (is_clear)
        {
            is_clear = false;
            return;
        }
        is_clear = true;
        double Result = 0;
        // public int indexOf(int ch): 返回指定字符在字符串中第一次出现处的索引
        String s1 = exp.substring(0,exp.indexOf(" "));//找到第一个数字
        Log.d("homework_3",s1);
        String op = exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);//找到运算符
        Log.d("homework_3",op);
        String s2 = exp.substring(exp.indexOf(" ")+3);//找到第二个数字
        Log.d("homework_3",s2);
        if (!s1.equals(" ")&&!s2.equals(" ")){
            double d1 = Double.parseDouble(s1);
            double d2 = Double.parseDouble(s2);
            if(op.equals("+")){
                Result = d1+d2;
                String o = String.valueOf(Result);
                Log.d("homework_3",o);
                result.setText(o);
                return;
            }else if (op.equals("-")){
                Result = d1-d2;
                String o = String.valueOf(Result);
                Log.d("homework_3",o);
                result.setText(o);
                return;
            }else if (op.equals("*")){
                Result = d1*d2;
                String o = String.valueOf(Result);
                Log.d("homework_3",o);
                result.setText(o);
                return;
            }else if (op.equals("/")){
                Result = d1/d2;
                String o = String.valueOf(Result);
                Log.d("homework_3",o);
                result.setText(o);
                return;
            }

        }
    }
}

到此，关于“Android studio怎么制作简易计算器功能”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！