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Android studio开发怎么实现计算器功能

发布时间:2022-05-20 11:54:45 来源:亿速云 阅读:135 作者:iii 栏目:开发技术

这篇文章主要介绍“Android studio开发怎么实现计算器功能”的相关知识,小编通过实际案例向大家展示操作过程,操作方法简单快捷,实用性强,希望这篇“Android studio开发怎么实现计算器功能”文章能帮助大家解决问题。

前言

android 开发小实验
android 移动开发实现 简易计算器功能
小白也能轻松上手,复制粘贴就可使用

使用工具

Android Studio 或者 intellij idea

首先体验一下结果

预览图

Android studio开发怎么实现计算器功能

Android studio开发怎么实现计算器功能

源码

前端页面布局

activity_calculator.xml

<?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:layout_width="match_parent"
              android:layout_height="match_parent"
              android:gravity="center"
              android:orientation="vertical"
              android:background="@drawable/bg2"
>   <TextView
        android:layout_width="410dp"
        android:layout_height="60dp"
        android:text="计算器"
        android:textSize="35dp"
        android:gravity="center"
        android:background="#A6EFEF"
        >

    </TextView>
    <TextView
            android:id="@+id/text_show"
            android:layout_width="410dp"
            android:layout_height="80dp"
            android:background="#EAB9B9"
            android:textSize="30dp"
    />

    <EditText
            android:id="@+id/ediText"
            android:layout_width="410dp"
            android:layout_height="70dp"
            android:layout_marginBottom="10dp"
            android:background="#EAB9B9"
            android:editable="false"
            android:gravity="right|center_vertical"
            android:paddingRight="20dp"
            android:hint="请输入数字"
            android:textSize="30sp"
    />


    <GridLayout
            android:layout_width="410dp"
            android:layout_height="400dp"
            android:columnCount="5"
            android:rowCount="6">

        <Button
                android:id="@+id/button6"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="←"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/button7"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="CE"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button8"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="C"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button9"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="±"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button10"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="√"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/nine"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="9"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"


        />

        <Button
                android:id="@+id/eight"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="8"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/seven"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="7"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/divider"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="/"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/button15"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="%"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/four"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="4"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/five"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="5"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/six"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="6"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/multiply"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="*"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/button20"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="1/X"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/one"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="1"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/two"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="2"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/three"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="3"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/minus"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="-"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/equal"
                android:layout_width="80dp"
                android:layout_height="100dp"
                android:layout_rowSpan="2"
                android:text="="
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/zero"
                android:layout_width="160dp"
                android:layout_height="wrap_content"
                android:layout_columnSpan="2"
                android:text="0"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />

        <Button
                android:id="@+id/point"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="."
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
        <Button
                android:id="@+id/add"
                android:layout_width="80dp"
                android:layout_height="wrap_content"
                android:text="+"
                android:background="#87F4F8"
                android:layout_margin="2dp"
                android:textSize="20dp"
        />
    </GridLayout>
</LinearLayout>

后端源码

CalculatorActivity.java

package com.example.myappch6;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class CalculatorActivity extends Activity implements View.OnClickListener{
    //数字0-9
    Button number_0;
    Button number_1;
    Button number_2;
    Button number_3;
    Button number_4;
    Button number_5;
    Button number_6;
    Button number_7;
    Button number_8;
    Button number_9;

    //运算符
    Button add;         //+
    Button minus;       //-
    Button mul;         //*
    Button divide;      //除
    Button equal;       //=
    Button point;       //小数点

    //清除
    Button det;

    boolean clean;               //清空标识

    EditText editText;           //结果显示集

    TextView text_show;          //显示计算器文本控件

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_calculator);
        //数字0——9实例化
        number_0=findViewById(R.id.zero);
        number_1=findViewById(R.id.one);
        number_2=findViewById(R.id.two);
        number_3=findViewById(R.id.three);
        number_4=findViewById(R.id.four);
        number_5=findViewById(R.id.five);
        number_6=findViewById(R.id.six);
        number_7=findViewById(R.id.seven);
        number_8=findViewById(R.id.eight);
        number_9=findViewById(R.id.nine);

        //运算符实例化
        add=findViewById(R.id.add);        //加
        minus=findViewById(R.id.minus);         //减
        mul=findViewById(R.id.multiply);        //乘
        divide=findViewById(R.id.divider);      //除
        equal=findViewById(R.id.equal);         //等
        point=findViewById(R.id.point);         //小数点
        det=findViewById(R.id.button8);         //清除

        //结果显示集
        text_show = findViewById(R.id.text_show);
        editText=findViewById(R.id.ediText);
//添加事件点击事件
        // 数字点击事件
        number_0.setOnClickListener( this);
        number_1.setOnClickListener(this);
        number_2.setOnClickListener( this);
        number_3.setOnClickListener( this);
        number_4.setOnClickListener(this);
        number_5.setOnClickListener( this);
        number_6.setOnClickListener( this);
        number_7.setOnClickListener(this);
        number_8.setOnClickListener( this);
        number_9.setOnClickListener( this);
        // 符号点击事件
        add.setOnClickListener( this);
        minus.setOnClickListener( this);
        mul.setOnClickListener( this);
        divide.setOnClickListener( this);
        point.setOnClickListener( this);
        equal.setOnClickListener( this);
        det.setOnClickListener( this);
    }

    //读取每个按钮内容
    public void onClick(View view){
        //获取文本内容
        String  input=editText.getText().toString();
        switch (view.getId()){
            case R.id.zero:     // 0
            case R.id.one:      // 1
            case R.id.two:      // 2
            case R.id.three:    // 3
            case R.id.four:     // 4
            case R.id.five:     // 5
            case R.id.six:      // 6
            case R.id.seven:    // 7
            case R.id.eight:    // 8
            case R.id.nine:     // 9
            case R.id.point:    //小数点
                if(clean){
                    clean=false;
                    editText.setText("");   //赋值为空
                }
                editText.setText(input+((Button)view).getText()+"");    //结果集就是本身
                break;
            case R.id.add:
            case R.id.minus:          // 减
            case R.id.multiply:       // 乘
            case R.id.divider:        // 除
                if(clean){
                    clean=false;
                    input="";
                    editText.setText("");
                }
                editText.setText(input+" "+((Button)view).getText()+" ");
                break;
            case R.id.button8:      //清除
                if(clean){
                    clean=false;
                    input="";
                    editText.setText("");
                }else  if(input!=null || !input.equals("")){
                    //如果获取内容为空
                    editText.setText(input.substring(0,input.length() - 1 ));//结果集为空
                    break;
                }
                break;
            case  R.id.equal:   //运算结果=
                getResult();    //调用处理结果方法
                break;
        }
    }
//运算结果方法
    private void getResult(){
        String exp=editText.getText().toString();       //获取文本框内容
        if(exp==null||exp.equals("")){
            return;
        }
        if(!exp.contains("")){
            return;
        }
        if(clean){
            clean=false;
            return;
        }
        clean=true;
        double result=0;
 //进行截取
        // 运算符前的数字
        String s1=exp.substring(0,exp.indexOf(" "));
        //运算符
        String op=exp.substring(exp.indexOf(" ")+1,exp.indexOf(" ")+2);
        //运算符后的数字
        String s2=exp.substring(exp.indexOf(" ")+3);

        if(!s1.equals("")&&!s2.equals("")){
            //如果包含小数点的运算
            double d1=Double.parseDouble(s1);//则数字都是double类型
            double d2=Double.parseDouble(s2);

            if(op.equals("+")){
                // 如果是+
                result=d1+d2;
                text_show.setText(d1+ "+" +d2+"=");
            }else if(op.equals("-")){
                //如果是-
                result=d1-d2;
                text_show.setText(d1+ "-" +d2+"=");
            }else if(op.equals("*")){
                //如果是*
                result=d1*d2;
                text_show.setText(d1+ "*" +d2+"=");
            }else if(op.equals("/")){
                if(d2==0){
                    //如果被除数是0
                    result=0;//则结果为0
                }
                else {
                    //否则执行正常运算
                    result=d1/d2;
                    text_show.setText(d1+ "/" +d2+"=");
                }
            }
            if(!s1.contains(".") &&!s2.contains(".")&&!op.equals("/")){
                //如果是整数类型
                int r=(int)result;//都是整形
                editText.setText(r+"");
            }else {
                editText.setText(result+"");
            }
        }else  if(!s1.equals("")&& s2.equals("")){
            //如果只输入运算符前的数字
            editText.setText(exp);//直接返回当前输入内容
        }else if (s1.equals("")&& !s2.equals("")){
            //如果是只输入运算符后面的数
            double d2 =Double.parseDouble(s2);

            //运算符当前没有输入数字
            if(op.equals("+")){
                result= 0 + d2;
                text_show.setText(d2+"=");
            }else  if(op.equals("-")){
                result= 0 - d2;
                text_show.setText(d2+"=");
            }else if (op.equals("*")){
                result= 0;

            }else  if(op.equals("/")){
                result= 0;
            }
            if(!s1.contains(".")&&!s2.contains(".")){
                int r=(int) result;
                editText.setText(r+"");
            }else {
                editText.setText(result+"");
            }
        }else {
            editText.setText("");
        }
    }
}

关于“Android studio开发怎么实现计算器功能”的内容就介绍到这里了,感谢大家的阅读。如果想了解更多行业相关的知识,可以关注亿速云行业资讯频道,小编每天都会为大家更新不同的知识点。

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